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  what should compression be on a Merc 35

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Author Topic:   what should compression be on a Merc 35
keltonkrew posted 10-30-2002 03:18 PM ET (US)   Profile for keltonkrew   Send Email to keltonkrew  
I have 1986 Merc 35. When I got it back from the shop for a broken shift shaft and motor mounts, I realized they did a compression check. The shop I take it to does compression checks on any engine brought in, not matter what is wrong.

Cylinder 1 = 160
Cylinder 2 = 150

Are these good numbers? What are they theoretically new?

Do these numbers give any indication of the condition of the motor?


BTW, this powers my 13' whaler!

BQUICK posted 10-30-2002 05:10 PM ET (US)     Profile for BQUICK  Send Email to BQUICK     
Fine numbers
thebone12 posted 10-30-2002 05:27 PM ET (US)     Profile for thebone12  Send Email to thebone12     
new is 160, I guess, they are good numbers anyway, no worries.
keltonkrew posted 10-30-2002 05:49 PM ET (US)     Profile for keltonkrew  Send Email to keltonkrew     
Thanks for the replies. I've only had the motor about 2 months. Taken it out 5-6 times. runs great, just curious if the comrpession numbers were good so I would know if I need to start saving for new power!

I know anything can happen, but if I give it TLC, proper oil/gas mixture, impeller, etc, I'm hoping it should last many years.

Thanks for the replies!

11 footer posted 10-30-2002 07:27 PM ET (US)     Profile for 11 footer  Send Email to 11 footer     
Thats very good compression for a 1986.


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