Compression Numbers - 1986 Evinrude 110 HP

[clm1117]

Left side top - 100
Left side bottom - 95
Right side top - 115
Right side bottom - 115

Motor has been sitting up for a number of years. Compression test done with throttle wide open but motor is cold because I didn't want it to start. I'm determining whether to spend the money to take it to a mechanic to get it running again.

So with those numbers what are your thoughts? Trash or treasure?

 

[racerone]

Pull the left side head off.-----I think you have broken piston rings.-----Every one of the v-4 crossflow motors will suffer from that sickness.

 

[clm1117]

Pull the left side head off.-----I think you have broken piston rings.-----Every one of the v-4 crossflow motors will suffer from that sickness.

Is it easy for a backyard mechanic to replace the rings? I've got the manuals. I'm guessing if the rings are broken they could have done other damage?

 

[racerone]

You likely need 4 new O/S pistons and rings.------No point putting new rings on old pistons.------With a manual and some wrenching ability you can do this.-----Start by pulling that head off for inspection.-----I like pictures.-----Maybe it just needs new head gasket.

 

[clm1117]

You likely need 4 new O/S pistons and rings.------No point putting new rings on old pistons.------With a manual and some wrenching ability you can do this.-----Start by pulling that head off for inspection.-----I like pictures.-----Maybe it just needs new head gasket.

Sounds good and reasonable. I have the OMC Service Manual. I'll pull the head off and post some pics. Maybe I'll get lucky and it's just the head gasket. More to come. Thanks.