Compression Check?

[Couper]

Thought I'd throw this here as well. In working on clocking my oil pump tang / intermediate gear I needed to put my #1 cly in the compression mode. Since you really can't get your finger in the spark plug hole I used a compression tester.

Screwed it in and turned the crank using a breaker bar... seems I get a slight huff but no reading on the compression gauge....well about 12psi.

This motor was built 3 years or so ago. Shouldn't I show a reading?

Am I ruining anything by turning the crank like this without priming oil? I probally turned it for 10 revolutions....

Thanks....

 

[redidbull]

I have never done a compression test without actually cracking the engine and throttle open all plugs out. I have heard of people putting a scrap of paper towel over the hole and when it blows off it is at the top stroke. Jim

 

[Couper]

From what I'm hearing....I won't show a good pressure cranking by hand. And most importantly they say I haven't ruined anything. Now to figure out the proper location of the damper for oil priming