Help with compression test

[oldboat1]

I have a Chrysler 10hp Sailor ('76-'77 model 100HA). The manual says the compression should be 115, plus or minus 10. (refers to "Compression -- Average Lbs."). I'm getting 150 P.S.I. in each cylinder. I must be doing something wrong.<br /><br />I just bought the tester. It's the kind you hold in the plug hole while cranking the engine. (I looked for the screw-in type, but this was the only one they had. I figured I could use it on this outboard since it's electric start with the starter button on the cowling.)<br /><br />Can somebody tell me what I'm doing wrong here. I'm baffled.<br /><br /> Curt in Maryland (oldboat1)

 

[JB]

Re: Help with compression test

Howdy Oldboat.<br /><br />You aren't doing anything wrong. The manual expects one type of guage and procedure. Your guage seems to read differently.<br /><br />You got the same reading on both. The critical part of the test is to look for differences between the cylinders. Your engine is tip-top.<br /><br />Red sky at night. . .<br />JB

 

[oldboat1]

Re: Help with compression test

Thanks, J.B. That's good news. I really want to use this old sucker, and when I get much beyond tweaking ignitions and such, I'm out of my depth. I've got a carb problem, I think, but the compression test threw me -- will get back to the carburetor, and see if I can find the problem there.<br /><br /> Curt