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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
The Mitsubishi 4G32 and you. A comprehensive guide to surviving poor financial decisions and overhauling a terrible engine.
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<blockquote data-quote="Scott Cee" data-source="post: 133976" data-attributes="member: 23817"><p>As far as disassembly went, it told the story of what likely happened to this engine, along with more things I found later.</p><p></p><p>The engine had been overheated at some point and popped the headgasket, whoever replaced it could not find the intake gasket so they RTV'd the intake on (bad). The manual calls for RTV around the coolant passage only, trust me they did the whole thing and there was no gasket. There also wasn't a thermostat in the housing when I took it apart:</p><p>[ATTACH=full]6119[/ATTACH]</p><p></p><p>Likely the heat from that had contributed to a valve guide failing, as is evident by the oil in the #3 chamber and cylinder:</p><p>[ATTACH=full]6120[/ATTACH]</p><p>[ATTACH=full]6121[/ATTACH]</p><p></p><p>The Gerotor pump, it's okay and I could not get one so it wound up being reused:</p><p>[ATTACH=full]6122[/ATTACH]</p><p></p><p>Oil pickup screen was in the process of clogging. I believe this was because the overheating event/coolant contamination caused the paint on the inside of the oil pan to fail and most of it wound up here. This may have partially starved the engine for oil, along with the damage that coolant contaminated oil does, so all main and rod bearings were in rough shape:</p><p>[ATTACH=full]6123[/ATTACH]</p><p></p><p>Long block ready to go to the machine shop. I did not take it apart any farther as they requested I bring them a long block and a dressed head:</p><p>[ATTACH=full]6124[/ATTACH]</p><p></p><p>The other causes of failure were that likely the rear main and back of the valve cover leaked oil into the squirrel fan, when then deposited it onto the hydro cooler and radiator. They then both plugged with dirt/mud/schmoo. At some point someone had removed and never reinstalled the access panel for the cooler that goes on the fan shroud, so no air was flowing through the radiator at that point. They may have got away with the headgasket failure, but continuing to run the engine like this resulted in serious deterioration. It still ran when I bought it, but barely, and it used oil faster than fuel.</p></blockquote><p></p>
[QUOTE="Scott Cee, post: 133976, member: 23817"] As far as disassembly went, it told the story of what likely happened to this engine, along with more things I found later. The engine had been overheated at some point and popped the headgasket, whoever replaced it could not find the intake gasket so they RTV'd the intake on (bad). The manual calls for RTV around the coolant passage only, trust me they did the whole thing and there was no gasket. There also wasn't a thermostat in the housing when I took it apart: [ATTACH type="full"]6119[/ATTACH] Likely the heat from that had contributed to a valve guide failing, as is evident by the oil in the #3 chamber and cylinder: [ATTACH type="full"]6120[/ATTACH] [ATTACH type="full"]6121[/ATTACH] The Gerotor pump, it's okay and I could not get one so it wound up being reused: [ATTACH type="full"]6122[/ATTACH] Oil pickup screen was in the process of clogging. I believe this was because the overheating event/coolant contamination caused the paint on the inside of the oil pan to fail and most of it wound up here. This may have partially starved the engine for oil, along with the damage that coolant contaminated oil does, so all main and rod bearings were in rough shape: [ATTACH type="full"]6123[/ATTACH] Long block ready to go to the machine shop. I did not take it apart any farther as they requested I bring them a long block and a dressed head: [ATTACH type="full"]6124[/ATTACH] The other causes of failure were that likely the rear main and back of the valve cover leaked oil into the squirrel fan, when then deposited it onto the hydro cooler and radiator. They then both plugged with dirt/mud/schmoo. At some point someone had removed and never reinstalled the access panel for the cooler that goes on the fan shroud, so no air was flowing through the radiator at that point. They may have got away with the headgasket failure, but continuing to run the engine like this resulted in serious deterioration. It still ran when I bought it, but barely, and it used oil faster than fuel. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
The Mitsubishi 4G32 and you. A comprehensive guide to surviving poor financial decisions and overhauling a terrible engine.
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