Compression

[JR]

I have a 1980 70 ho Evinrede.<br />I first cheched each cyl with plugs out, and got from 128 to 132 pounds,<br />how ever the bottom cyl lost pressue I the checked each cyl with the plugs in.<br />The botton cyl still is losing perssure. Is this a problem?<br /><br />JR

 

[Backlash]

Re: Compression

Hey JR,<br />How did you determine that you were losing pressure in the bottom cylinder? Your compression figures sound pretty good.<br />Backlash

 

[JR]

Re: Compression

Hi.<br />The pressure guage started to bleed off real fast. I did the check a couple of times to make <br />sure it wasn't a flook.<br /><br />JR

 

[G DANE]

Re: Compression

Hi JR<br /><br />Compression usually lowers fast, but the cylinder in question can have small scores. If it can maintain same toppressure, its usually no problem. Is there any problem with your motor, besides from this ?

 

[JR]

Re: Compression

Hi G DANE,<br /><br />I pulled the head and checked the cyl walls they looked fine. I checked the head with a square<br />and it appears that it may need to be plained. while I have it down I will replace the thermostst<br />and check valve. It appears that the motor has over heated at one time.<br /><br />Thanks,<br /><br />JR