Low Compression

[ghoster32]

I Have A Evenrude 70 Hp 3 Cyl And Had It Out Today Notised Loss In Power And Starting Lottle Hard I Am A Mechanic So When I Got Home I Did A Campression Check And Fount Top Cylinder Down To 60 Psi And Middle 120 And Bottom 120 But Motor Is Running On All 3 Cyl My Question Is Is These 1976 Engines Hard To Rebuild I Dont Seem To See How The Cylinder Comes Off Like A Snowmibile ??i Do See The Head Bolts. Is It Possible To Replace One Piston Without Removing Other 2 Cylinders And If I Remove Head Is There Cylinder Bolts Under Head ?? Thanks

 

[iwombat]

Re: Low Compression

You probably just blew through the head gasket - an easy fix if caught early enough. However, that usually indicates an overheat problem. There's always a cause for these things, find that first.

 

[ghoster32]

Re: Low Compression

I Checked Plugs All Nice And Tan And I See No Alluminum From Piston Is This Motor 3 Individual Head Gaskets Or All One Big One

 

[shearpin]

Re: Low Compression

one complet head gasket. sounds like you need to pick up a service manule.

 

[iwombat]

Re: Low Compression

Your impeller and t-stats been serviced recently? Check or replace before toasting another head gasket.