Lower cylinder compression testr on Merc 850

[stopngo]

No room to attach compression tester.

Are there special attachments available??

 

[Chris1956]

If the "nose"of the compression test will unscrew, a brass elbow can make it fit the lowest cylinder.

Alternatively, remove the 4 bolts on the rear cowling support and the 2 front bolts, and the lower cowling will move some. If that doesn't get it, remove the 4 self tapping screws on the lowest piece of cowling (where it says 85HP), and that will give the lower cowling more movement.

 

[stopngo]

Thank you so much.It worked

 

[racerone]

It is also easy to inspect pistons / rings through transfer port covers.----Allows you to look at cool side ( intake ) of the pistons.----If that is good then usually compression is OK.-----Note----That motor may not have an overheat warning / shutdown system.----A new water pump impeller every 3 years will save you a lot of grief !