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General Bobcat Skidsteer Forum
743 crankcase pressure problem
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<blockquote data-quote="Tazza" data-source="post: 133327" data-attributes="member: 82"><p>I work for a diesel engine repair company, we rebuild multiple V1702 engines every week.</p><p></p><p>The only place you can get crank case pressure is via the pistons/rings, valves can't push combustion gasses into the crank case,</p><p></p><p>If you engine got hot, yes these heads are prone to cracking between valves or valve to pre-combustion chamber. They are prone, but they do not ALWAYS crack.</p><p></p><p>When these engines get hot, the rings can loose tension, get stick in the ring grooves of the piston, or worst case, pickup in the bores.</p><p></p><p>Your head is already off, flip it over and take the sump off and pill your pistons, ensure the rings are not stuck. You're up for a $100 head gasket, no sense putting a new one on and needing to replace it yet again. You can re-seal the sump with silicone without issues.</p><p></p><p>As for smoke, if you get lots of white smoke when cranking, your compression is low, it's not igniting the air/fuel charge. If this started after the over heating event, it's likely stuck rings. Black smoke would be a sign of bad injector spraying. If it was dripping, you will see evidence on the piston, fuel leaking will erode the surface of the piston.</p></blockquote><p></p>
[QUOTE="Tazza, post: 133327, member: 82"] I work for a diesel engine repair company, we rebuild multiple V1702 engines every week. The only place you can get crank case pressure is via the pistons/rings, valves can't push combustion gasses into the crank case, If you engine got hot, yes these heads are prone to cracking between valves or valve to pre-combustion chamber. They are prone, but they do not ALWAYS crack. When these engines get hot, the rings can loose tension, get stick in the ring grooves of the piston, or worst case, pickup in the bores. Your head is already off, flip it over and take the sump off and pill your pistons, ensure the rings are not stuck. You're up for a $100 head gasket, no sense putting a new one on and needing to replace it yet again. You can re-seal the sump with silicone without issues. As for smoke, if you get lots of white smoke when cranking, your compression is low, it's not igniting the air/fuel charge. If this started after the over heating event, it's likely stuck rings. Black smoke would be a sign of bad injector spraying. If it was dripping, you will see evidence on the piston, fuel leaking will erode the surface of the piston. [/QUOTE]
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743 crankcase pressure problem
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