{"id":7268,"date":"2026-06-20T10:31:07","date_gmt":"2026-06-20T10:31:07","guid":{"rendered":"http:\/\/australianholden.com\/?p=7268"},"modified":"2026-06-20T22:13:18","modified_gmt":"2026-06-20T22:13:18","slug":"holden-186-engine-issues-explained","status":"publish","type":"post","link":"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/holden-186-engine-issues-explained\/","title":{"rendered":"Holden 186 Engine Issues Explained"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Few engines are as important to Holden&#8217;s history as the legendary 186 Red Motor. Introduced in 1968, the 186 quickly became one of Holden&#8217;s most respected powerplants, finding its way into everything from HR and HK Holdens through to Monaros, Kingswoods, commercials and countless race and performance cars. With its simple pushrod design, impressive torque and exceptional durability, the 186 earned a reputation as one of Australia&#8217;s toughest six-cylinder engines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even today, many Holden enthusiasts consider the 186 the sweet spot of the Red Motor family. It offered noticeably stronger performance than the 149 and 161 while retaining excellent reliability and relatively low running costs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, no engine is perfect. Most surviving 186 engines are now more than fifty years old, and age-related wear has become the biggest source of problems. Oil leaks, cooling issues, worn timing gears and ignition faults are among the most common complaints faced by owners today.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Why the Holden 186 Became So Popular<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Before looking at the problems, it&#8217;s worth understanding why the 186 remains so highly regarded.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cast iron block<\/li>\n\n\n\n<li>Cast iron cylinder head<\/li>\n\n\n\n<li>Seven main bearing crankshaft<\/li>\n\n\n\n<li>Pushrod valve train<\/li>\n\n\n\n<li>Single-barrel Stromberg carburettor<\/li>\n\n\n\n<li>Excellent torque characteristics<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The seven-bearing bottom end contributed significantly to the engine&#8217;s durability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many well-maintained 186 engines have exceeded 300,000 kilometres without major internal repairs.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Oil Leaks<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The most common issue affecting Holden 186 engines is oil leakage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oil spots on driveway<\/li>\n\n\n\n<li>Oil-covered engine bay<\/li>\n\n\n\n<li>Burning oil smell<\/li>\n\n\n\n<li>Gradual oil loss<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Leak Locations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rocker cover gasket<\/li>\n\n\n\n<li>Side plate covers<\/li>\n\n\n\n<li>Timing cover<\/li>\n\n\n\n<li>Rear main seal<\/li>\n\n\n\n<li>Sump gasket<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most oil leaks are caused by ageing gaskets rather than major engine damage.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Oil Leak Repair Product<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Permaseal Engine Gasket Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High-quality sealing materials<\/li>\n\n\n\n<li>Direct fitment<\/li>\n\n\n\n<li>Comprehensive coverage<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oil leak repairs<\/li>\n\n\n\n<li>Engine rebuilds<\/li>\n\n\n\n<li>Preventative maintenance<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing ageing gaskets often transforms a messy engine.<\/p>\n\n\n<div id=\"fu_ebay_0\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 0 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_0\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Holden 186 gasket kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_0 = null;\nvar waitForDepends_fu_ebay_0 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_0);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_0 = jQuery(\"#fu_ebay_0\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Holden 186 gasket kit\",\nfu_ebay_query : \"Holden 186 gasket kit\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 0,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_0.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Timing Gear Failure<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">One of the best-known weaknesses of the Holden Red Motor family involves the factory timing gear.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Engine misfire<\/li>\n\n\n\n<li>Poor performance<\/li>\n\n\n\n<li>Timing instability<\/li>\n\n\n\n<li>Difficulty starting<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Happens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Holden originally fitted a fibre camshaft timing gear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Over time, the teeth become brittle and eventually fail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In severe cases, the engine may stop running completely.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Cooling System Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling issues are common in older 186-powered Holdens.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overheating<\/li>\n\n\n\n<li>Coolant loss<\/li>\n\n\n\n<li>Steam from radiator<\/li>\n\n\n\n<li>Rising temperature gauge<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blocked radiator<\/li>\n\n\n\n<li>Worn water pump<\/li>\n\n\n\n<li>Faulty thermostat<\/li>\n\n\n\n<li>Internal corrosion<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many engines have accumulated decades of sediment inside the cooling passages.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Cooling System Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Dayco Water Pump<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Improved coolant circulation<\/li>\n\n\n\n<li>Reliable construction<\/li>\n\n\n\n<li>Direct replacement<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cooling system rebuilds<\/li>\n\n\n\n<li>Preventative maintenance<\/li>\n\n\n\n<li>Touring vehicles<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_1\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 1 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_1\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Dayco Holden 186 water pump<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_1 = null;\nvar waitForDepends_fu_ebay_1 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_1);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_1 = jQuery(\"#fu_ebay_1\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Dayco Holden 186 water pump\",\nfu_ebay_query : \"Dayco Holden 186 water pump\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 1,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_1.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Worn Valve Guides<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">High-mileage 186 engines frequently develop valve guide wear.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blue smoke on startup<\/li>\n\n\n\n<li>Increased oil consumption<\/li>\n\n\n\n<li>Fouled spark plugs<\/li>\n\n\n\n<li>Reduced performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why It Happens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thousands of operating hours gradually wear guide surfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Valve guide wear is especially common on engines that have seen infrequent maintenance.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Excessive Oil Consumption<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Not all oil consumption is caused by leaks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frequent top-ups<\/li>\n\n\n\n<li>Blue exhaust smoke<\/li>\n\n\n\n<li>Carbon deposits<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn piston rings<\/li>\n\n\n\n<li>Valve guide wear<\/li>\n\n\n\n<li>Cylinder bore wear<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Engines with significant oil consumption may require rebuilding.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Carburettor Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Most Holden 186 engines were fitted with a Stromberg carburettor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rough idle<\/li>\n\n\n\n<li>Hesitation<\/li>\n\n\n\n<li>Poor fuel economy<\/li>\n\n\n\n<li>Hard starting<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Blocked jets<\/li>\n\n\n\n<li>Worn throttle shafts<\/li>\n\n\n\n<li>Dried gaskets<\/li>\n\n\n\n<li>Float issues<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fortunately, Stromberg carburettors are simple to rebuild.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Carburettor Rebuild Kit<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: Stromberg Rebuild Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restores fuel delivery<\/li>\n\n\n\n<li>Improves starting<\/li>\n\n\n\n<li>Better fuel economy<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Original restorations<\/li>\n\n\n\n<li>Routine maintenance<\/li>\n<\/ul>\n\n\n<div id=\"fu_ebay_2\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 2 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_2\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Stromberg rebuild kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_2 = null;\nvar waitForDepends_fu_ebay_2 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_2);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_2 = jQuery(\"#fu_ebay_2\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Stromberg rebuild kit\",\nfu_ebay_query : \"Stromberg rebuild kit\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 2,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_2.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Ignition Problems<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The original points ignition system requires regular maintenance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Symptoms<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hard starting<\/li>\n\n\n\n<li>Misfiring<\/li>\n\n\n\n<li>Rough idle<\/li>\n\n\n\n<li>Reduced performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Causes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Worn points<\/li>\n\n\n\n<li>Condenser failure<\/li>\n\n\n\n<li>Coil problems<\/li>\n\n\n\n<li>Distributor wear<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Many drivability complaints can be traced directly to ignition issues.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Best Ignition Upgrade<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Product: PerTronix Electronic Ignition Kit<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Eliminates points wear<\/li>\n\n\n\n<li>Improved reliability<\/li>\n\n\n\n<li>Better starting<\/li>\n\n\n\n<li>Reduced maintenance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Best For<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Daily drivers<\/li>\n\n\n\n<li>Touring vehicles<\/li>\n\n\n\n<li>Mild performance upgrades<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is one of the most popular upgrades among Red Motor enthusiasts.<\/p>\n\n\n<div id=\"fu_ebay_3\"><!-- Presentation: cols = 4, rows = 2, slideshow = Manual, slides = 3, slideId = 3 --><div class=\"fu_ebay_results_container \">\n<h5 class=\"fu_ebay_results_title\" style=\"display: block !important;\">\n<a name=\"fu_slidetop_3\"><\/a><a href=\"https:\/\/www.ebay.com.au\/?mkcid=1&#038;mkrid=705-53470-19255-0&#038;siteid=15&#038;campid=5339152561&#038;customid=5339151688&#038;toolid=10049&#038;mkevt=1\" class=\"fu_ebay\" style=\"display:inline !important;\" rel=\"nofollow\" target=\"_blank\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/australianholden.com\/wp-content\/plugins\/fast-ebay-listings\/US\/Right_Now_108x45.gif?resize=108%2C45&#038;ssl=1\" style=\"border:0;display:block !important;\" width=\"108\" height=\"45\" alt=\"Right Now on eBay\"\/><\/a>&nbsp;Holden 186 ignition kit<\/h5>\nLoading&#8230;<\/div>\n<\/div>\n<script>\n<!--\nvar content_fu_ebay_3 = null;\nvar waitForDepends_fu_ebay_3 = setInterval(function () {\n  if (typeof jQuery !== \"undefined\") {\n  if (window.fu_is_bot_useragent !== undefined) {\n    clearInterval(waitForDepends_fu_ebay_3);\n    if (typeof jQuery.ajax == \"undefined\") {\n      console.log(\"Fast eBay Listings: jQuery.ajax missing. 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Are you using jQuery.Slim that doesn't include ajax? \");\n      return;\n    }\n    if (fu_is_bot_useragent) return;\n    content_fu_ebay_5 = jQuery(\"#fu_ebay_5\");\n    jQuery(document).ready(jQuery.ajax({\n      type : \"post\",\n      url : \"https:\/\/australianholden.com\/wp-admin\/admin-ajax.php\",\n      data : {\n        action : \"fu_ebay_load_search\",\nfuDisableAPICache : 0,\nfuTraceLogging : 0,\nebay_country : \"AU\",\nfu_ebay_customId : \"\",\nfu_ebay_widget : 0,\nfu_ebay_picwidth : 225,\nfu_ebay_arrangement : 0,\nfu_ebay_title : \"Penrite HPR 30\",\nfu_ebay_query : \"Penrite HPR 30\",\nfu_ebay_searchInDesc : 0,\nfu_ebay_searchLocation : \"Internationally\",\nfu_ebay_pickupPostcode : \"\",\nfu_ebay_pickupRadius : 0,\nfu_ebay_sort : \"BestMatch\",\nfu_ebay_categoryIds : \"6030\",\nfu_ebay_sellers : \"\",\nfu_ebay_sellerType : \"\",\nfu_ebay_buyingOptions : \"\",\nfu_ebay_conditionOptions : \"\",\nfu_ebay_minPrice : 0,\nfu_ebay_maxPrice : 0,\nfu_ebay_minBids : 0,\nfu_ebay_maxBids : 0,\nfu_cols : 4,\nfu_rows : 2,\nfu_slideshow : \"Manual\",\nfu_slides : 3,\nfu_slideId : 5,\n\n      },\n      success : function( response ) {\n        content_fu_ebay_5.html( response );\n      },\n      error: function(e) {\n        console.log(\"Fast eBay Listings: deferred loading error: \" + e);\n      }\n    }));\n  }}\n}, 10);\n\/\/-->\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading\">Common 186 Engine Repair Mistakes<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Ignoring Cooling System Maintenance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many overheating problems begin with neglected cooling systems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Delaying Timing Gear Replacement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Factory fibre gears eventually fail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Replacing them proactively can prevent breakdowns.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using Modern Low-Zinc Oils<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Older flat-tappet camshafts require suitable oil formulations.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overlooking Ignition Maintenance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Points systems require regular adjustment and servicing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Holden 186 is rightly regarded as one of Australia&#8217;s greatest engines. Its combination of simplicity, durability and strong performance helped cement Holden&#8217;s reputation throughout the late 1960s and early 1970s. Most issues seen today are not design flaws but the result of decades of service and normal wear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Oil leaks, timing gear failures, cooling system issues and ignition problems remain the most common concerns, but fortunately they are well understood and relatively easy to address. Products such as steel timing gears, PerTronix ignition kits, Penrite HPR 30 oil, Dayco water pumps and quality gasket kits can dramatically improve reliability and drivability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For enthusiasts restoring an HR, HK, HT or HG Holden, understanding these common issues is the key to enjoying everything the legendary 186 Red Motor has to offer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-149-179-issues-explained\/\" type=\"post\" id=\"7232\">Holden Red Motor 149 &amp; 179 Issues Explained<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/17\/holden-red-motor-cooling-system-problems\/\" type=\"post\" id=\"7234\">Holden Red Motor Cooling System Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/holden-red-engine-oil-leak-guide-2\/\" type=\"post\" id=\"7247\">Holden Red Engine Oil Leak Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/holden-202-engine-issues-explained\/\" type=\"post\" id=\"7311\">Holden 202 Issues Explained<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/hr-holden-transmission-problems\/\" type=\"post\" id=\"7274\">HR Holden Transmission Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/hd-holden-electrical-problems\/\" type=\"post\" id=\"7264\">HD Holden Electrical Problems<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/16\/how-to-inspect-an-early-holden-before-buying\/\" type=\"post\" id=\"7193\">How to Inspect an Early Holden Before Buying<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Few engines are as important to Holden&#8217;s history as the legendary 186 Red Motor. Introduced in 1968, the 186 quickly became one of Holden&#8217;s most respected powerplants, finding its way into everything from HR and HK Holdens through to Monaros, Kingswoods, commercials and countless race and performance cars. With its simple pushrod design, impressive torque [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":579,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-7268","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Holden 186 Engine Issues Explained - Australian Holden<\/title>\n<meta name=\"description\" content=\"The most common issue affecting Holden 186 engines is oil leakage.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/australianholden.com\/index.php\/2026\/06\/20\/holden-186-engine-issues-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Holden 186 Engine Issues Explained - 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