Posted by joe csuti on July 16, 2013 at 13:46:04 from (4.248.66.255):
In Reply to: Tecumseh ??? posted by Phil25 on July 16, 2013 at 04:29:27:
First thing to do is check crankcase breather valve,same may be full of oil or valve stuck,you shouldn't have that much pressure buildup in crankcase when cranking eng,although in wouldn't cause a loss of compression.
Next double check valve clearances,most/all tecumseh ohv eng set at .004" on intake/exhaust,if clearances correct do a leakdown test on eng to confirm possible cause of compression loss.
Possible causes of compression loss,scored cyl wall/stuck rings as Hal said,broken ring(s) or excessive ring/cyl wear,valves ground/seated incorrectly,warped valve(s)/valve seat(s),valve seat loose in head,worn valve guides,weak/broken valve spring(s),worn cam,head torqued incorrectly,head warped.
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