Engine Rebuild -- What's Actually Involved
06-28-2016, 02:52 PM
#11
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How do can you do a leak down if there's no compression in the cylinder, or did I miss something.
06-28-2016, 03:33 PM
#12
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The leak down will isolate where the problem is resulting in the loss of compression. The air will escape either thru the intake, exhaust, or crankcase.
06-28-2016, 04:31 PM
#13
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I understand how it works, but if there's NO compression you cant tell anything, could be a hole in the top of the piston, the OP said no compression not low
06-28-2016, 04:43 PM
#14
If there is a hole in the piston you will hear the air escaping from the crankcase (breather), instead of out the exhaust or through the carb if there were a stuck/broken valve. It might not tell you for certain that it is a hole in the piston versus a broken ring, but it would help to isolate the problem a little more and maybe tell you if the engine has to come out versus possibly pulling a head and fixing a valve.
06-28-2016, 04:48 PM
#15
Yeah -- the marina is doing that this afternoon... why they didn't do that as soon as they found out the compression was gone -- I'm not sure.
Doing some reading, seems like I'm hoping for something in the top end of the motor.
While I'm certainly in no position to debate this assesment (and fear it may be accurate), it does seem a bit strange to me. Even after the overheat, the boat was running absolutely fine, except with more than 3/4 throttle.
Doing some reading, seems like I'm hoping for something in the top end of the motor.
While I'm certainly in no position to debate this assesment (and fear it may be accurate), it does seem a bit strange to me. Even after the overheat, the boat was running absolutely fine, except with more than 3/4 throttle.
If you are truly getting zero compression it almost has to be a really big hole in a piston or valve.
06-28-2016, 05:15 PM
#17
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I think my heads warped for posting on here
06-28-2016, 08:48 PM
#20
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Yeah -- the marina is doing that this afternoon... why they didn't do that as soon as they found out the compression was gone -- I'm not sure.
Doing some reading, seems like I'm hoping for something in the top end of the motor.
While I'm certainly in no position to debate this assesment (and fear it may be accurate), it does seem a bit strange to me. Even after the overheat, the boat was running absolutely fine, except with more than 3/4 throttle.
Doing some reading, seems like I'm hoping for something in the top end of the motor.
While I'm certainly in no position to debate this assesment (and fear it may be accurate), it does seem a bit strange to me. Even after the overheat, the boat was running absolutely fine, except with more than 3/4 throttle.
