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Latest Posts
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I might be misinterpreting the compression test results you've posted. Wouldn't be the first thing I've screwed up this morning! But, most if not all compression testers have a one way valve. That is to record the highest compression pressures it sees during the test. It will leave the gauge at that highest level, even it there is no compression left in the engine's cylinder after it stops cranking, until the release valve is pushed to release it back to zero. I'm thinking that your 130 and 125 pressure readings, after being left for 15 to 20 minutes are just the pressure captured and retained by the gauge and hose? Reason is I've never seen an engine cylinder that will retain 125 lbs of compression more than a dozen seconds as those peak pressures bleed down fairly rapidly through the rings. Those are by no means anywhere near a perfect seal. Your last results would seem to show a bubble was left in the system that you have now released. Great detective work! Maybe its time to just run the machine as you normally would paying attention to the temperature, coolant level and its appearance, and of course importantly, the oil level and its appearance. If you have a head gasket issue, it will soon show up in the coolant or oil being compromised. -
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By Greg Kilgore · Posted
Thanks, Alien10, I need all the luck and confidence I can get. I'll get it one way or another. Well a bit more confused now. I'll list what happened in order. 1. Opened the bleed screw on goose neck on top of cylinder. No antifreeze came out. Couldn't see antifreeze in hole. Screwed bleeder back on. 2. Opened radiator cap. Coolant was a little low. Topped it off. Left cap off. 3. Opened the bleed screw and left off until antifreeze came out. 4. Topped off radiator with coolant and put cap back on. 5. Made sure both of the ball valves were on. So coolant had a least resistance path through the engine. 6. Started engine and let it run for about 10 minutes. No smoke came out of muffler. Did have some "air" come out the hose that broke off the air oil separator. 7. Removed spark plug, disconnected the coil and fuel pump. Installed the compression tester. Held gas pedal to the floor cranked the engine. Got 130psi. (Didn't do the pedal thing during the 1st testing). Lite a cigarette and started the stop watch on the phone. Listened and felt for air at muffler and air oil separator hose. Nothing. Raised the front of UTV about 6 inches. Removed radiator cap. There was a little pressure. But didn't see any bubbles. I drained the overflow jug back down to full mark. 8. So 12 minutes has passed. Compression gauge is reading 125psi. 9. After 16 minutes, compression gauge is still 125psi. I bumped the engine in case the piston is in some way sealing the gasket that I think is compromised. 10. Watching the radiator, still no bubbles, after 20 minutes. Compression gauge is still at 125psi. Can't hear of feel any air at muffler or crank case hose. I release pressure on gauge. Hold gas WOT and crank engine. Compression gauge goes up to 125psi. Battery is weak. Drops to 10.5 while cranking and only 12.1 after. 11. After 30 minutes the compression gauge still at 125psi. Couldn't hear or feel or see air escaping anywhere. Radiator still topped off. No bubbles. Opened the bleed screw. Had coolant weeping around threads. 12. So now 40 minutes has passed from cranking the compression tester the 1st time today. Gauge still at 125psi. No bubbles, or anything. 13. I release pressure from gauge. Removed gauge. Install spark plug. Reconnect coil and fuel pump. Left machine in air. Started machine. 14. Let it run to get operating temp up. Variating the RPM from idle to 5k. Did get some blue smoke, but not a lot. Did have steady blow-by out the crank case hose, even with high RPM. Didn't see any bubbles in radiator. Put cap back on cause coolant started rising when engine temp started to rise. Didn't see any bubbles rising in the overflow jug. Loosen the bleed screw and no air came out. It just weeping coolant. Raised temp to about 150°. Still no bubbles in overflow tank. 15. Turned machine off. Left front end up in air. Will check everything again tomorrow, Sunday or Monday. At this point looks like there was/still some air in the coolant system. As motojoe, Alien10, and Joe Breaux has said all along. But I'm not 100% sure if head gasket is blown or just had air bubble. I'm going to raise the front some more. Then do the same testing and see what happens. As the great Sweat-Hog, Vinnie Barbarino, once said, "I'm so confused." I feel better now. 😂
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