Posted by mkirsch on August 19, 2009 at 11:39:09 from (64.80.108.57):
In Reply to: 140 no compression posted by Brad M-C on August 18, 2009 at 11:38:49:
Try putting your thumb over the spark plug hole, or sticking whatever finger fits tightly into the hole, then hit the starter.
If it feels like it's trying to blow your finger out of the hole, or air gets pushed by, you have at least SOME compression.
You said the valves have "plenty" of clearance earlier. How much clearance? Factory clearance, or a lot of clearance, like 1/4"?
Where did all the oil go when you FILLED the cylinders with oil? Wherever that oil ended up is where it's leaking, if it's leaking.
Even if you had really bad rings and all the gaps lined up, you'd still have SOME compression, not zero.
Even if the valves weren't seating properly, you'd still have SOME compression, not zero.
In order to get zero compression,
#1. all four pistons would have to have large holes in them...
OR
#2. at least one valve in each cylinder would need to be stuck wide open.
If #1 were true, then you would never have been able to fill the cylinders with oil. All the oil would've run down into the crankcase before you could turn the engine over.
If #2 were true, then you woudn't have normal valve clearances in the head.
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