For the past few years the engine, which currently has 351 hour on it has been pulling oil through the breather tube into the carburetor under load at speeds above 1,300 RPMs; large amounts of white smoke exhausting. Other than that it starts fine and seems to run AOK; no misses and the spark plugs are clean. This past weekend I did a compression test with the results below:
Top: 162 dry 200 wet
Bottom: 135 dry 145 wet
Seems to be a big difference with bottom being weaker.
My best guess is that there is some damage associated with the bottom cylinder, maybe a broken ring that is building up presser in the engine crankcase that forces the oil through the breather tube at high RPMs. This may have been caused by my running the engine for several minutes with the water valve closed several years ago.
Can you tell me if the compression test is consistent with my assumption? If no is there some other troubleshooting that you can recommend?
Thanks in advance
Rick
Top: 162 dry 200 wet
Bottom: 135 dry 145 wet
Seems to be a big difference with bottom being weaker.
My best guess is that there is some damage associated with the bottom cylinder, maybe a broken ring that is building up presser in the engine crankcase that forces the oil through the breather tube at high RPMs. This may have been caused by my running the engine for several minutes with the water valve closed several years ago.
Can you tell me if the compression test is consistent with my assumption? If no is there some other troubleshooting that you can recommend?
Thanks in advance
Rick