Search results

If the carb is at fault there will be a performance issue most likely. If the engine performs well until overloaded with gas in the oil, it's likely a pinhole in the fuel pump diaphragm. It'll make fuel pressure to keep the engine running, but will slowly fill the crankcase with gas.

Finally contacted Kohler and spoke to a fella in the tech dept. Described what the original user told me about the failure and what I'd found, or not found. He said since it happened suddenly, and there is no scoring of cylinder wall, and no blown head gasket there was one more tiny thing that...

Well indeed, there is a lot of crankcase pressure, so there is a good deal of blow-by present. I wanted to see how much oil was blowing out. Stuck the breather end of the breather tube on a bottle and started it up. After a couple minutes it started pumping a steady flow. About 8 oz in...

Thanks. I'll check that tomorrow. This is exactly what happened to the previous owner his last use. That's why I went straight to replacing the head gasket, but the gasket looked fine.

Add:. The intake and carb had lots of oil within, so yes there was oil on the intake valves. Specs called for 15 then 30 lb/ft. That's how they were torqued, and if the new head gasket was the issue it would lag at startup from compression loss.

Looked good. Required very little cleaning of head or piston. No scoring on cylinder wall. Nothing out of the ordinary. And, at startup, it's immediate. No wind up as you'd expect with low compression. This is baffling! I thought about my earlier fuel pump question. But if that were...

Well, it's a mystery indeed. Oil level is fine, no rich fuel condition at any time. Original head gasket was intact, and showed no signs of leakage. Certainly not the kind of leakage to allow this level of intrusion. Starts immediately cold or warm. Starts acting weird 5 to 7 minutes after...

I'll check that, but would expect fuel rich exhaust. Oil level was in safe range before I replaced the head gasket, and after topping off before startup, it still is. I am wondering if the mechanical fuel pump could be allowing intrusion, but the cool/warm conditions puzzle me.

Command 17.5 CV491S engine. Last use, the engine began smoking heavy, and engine choked out. Owner thought the head gasket was blown. I replaced the head gasket, (but found no evidence of damaged gasket) and upon startup it smoked heavy, then began to clear after several minutes. I moved to...