Need help with a 1996 Mercury Force 90 HP!!!!

[Cade069]

I purchased a bayliner capri and a brand new trailer for $800, but the engine has no compression in the #2 cylinder and no fire. Before I tear into it, can anyone give me a brief description on removing the head?? I also was wondering what the possible causes for the no firing problem.

 

[Barnacle_Bill]

Re: Need help with a 1996 Mercury Force 90 HP!!!!

Highly recommend you get a manual.

 

[walk-on]

Re: Need help with a 1996 Mercury Force 90 HP!!!!

I agree that a manual is a must if you are going to work on your motor. I have the 1995 version of the same motor and it has 14 bolts that hold the head on.

I also had a problem with low compression on the #2 cylinder and after removing the head I found that I had lost part of the ring which scored the cylinder. This resulted in a rebuild which I just completed (after almost two years).

No fire could be a bunch of things that the manual will walk you through. I would check the kill switch first to be sure it is not preventing spark. It could also be the stator, coils, or switch box, all of which I've had to replace on my motor.

Good luck!

 

[Cade069]

Re: Need help with a 1996 Mercury Force 90 HP!!!!

I pulled the power head off and could see the #2 piston. It has a small piece missing and is definately the reason for the zero compression. lol. The walls don't look to be scared up though. Would it be cheaper to scrap this blended motor due to the fact of it being a blended motor and just get another?? If not, how would i accumulate a repair manuel on it?? I just don't want to dump money in it if i'm not gonna get a decent life span out of it.

 

[walk-on]

Re: Need help with a 1996 Mercury Force 90 HP!!!!

Please post a picture of the piston and cylinder walls. If the cylinder is not in that bad of shape you may be able to replace just the piston and rings. I took the other route (as recommended here) and replaced all three pistons, had the #2 cylinder bored over 0.02 and had the other two "good" cylinders polished. Even with all that and some of the tools I had to purchase, I had about $600 total in the rebuild.