Force 90 Outboard Ran Hot

[Laynei]

I am a new boat owner and bought a 1993 Bayliner with a 1993 90 HP Force Outboard Engine. It ran fine until last week when a overheat horn sounded that I didn't know what it was, so I continued to run it. The engine eventually shut down. I'm sure the water pump went out, but since I din't know what to do, I am not sure if the engine is repairable or no. The compresson on number 1 is supposed to be 135-145 and number 2 and 3 145-155. The pressure on number 1 is 120, number 2 is 90, and number 3 is 115. A mechanic told me that it may have just damaged the head gaskit and may need some oil sprayed down into the cylinders because they are most likely very dry now. What is the most likely problem. The engine sounds normal as it turns over, but will not crank even after it cooled down.

 

[WillyBWright]

Re: Force 90 Outboard Ran Hot

Welcome to iboats. <br /><br />Sorry to hear of your misfortune. Have the head removed to inspect the cylinders. Expect the worst, but hope for the best. It's not hard to remove it. You can do it yourself with basic tools.

 

[Laynei]

Re: Force 90 Outboard Ran Hot

I took the head off and the head looks good. I sprayed outboard oil into each cylinder before taking the head off and compression improved. The book says compression should be 135-145 for # 1, and 145-155 for 2 and 3. My compression drop is on number 2 and is around 20, which looks like it has slight grooves in the cylinder wall. There is also some slight damage at the very top of the cylinder wall. Number 2 walls do not feel as smooth at the bottom, but it is not highly damaged. The pistons look good and the rings do not looked damaged. Engines turns over with no noticable differrence in sounds coming from engine. Would sending a picture help. Would putting a new head gasket on make the difference. I have a guy who does this type of work say he will look at it, but he is 50 miles away and charges 65 a hour. I have never rebuilt a engine, but do most of the other work with my cars, but I'm new to boat engines. What are my chances of making this run well again without spending a ton of money? I know the water pump needs replacing and I bought a book detailing this procedure, but I'm still a little uptight about doing any of this.

 

[imported_LakeRunner]

Re: Force 90 Outboard Ran Hot

The Clymers or Seloc are good manuals but tend to be very generic since they cover many models. I bought a Force service manual and it gives excellent procedures as well as the manufacture specs and part numbers. The water pump and impeller replace took me about 45 minutes from dropping the LU to putting it back in. Be careful to get pickup rod lined up correctly or you be doing this again. Puuting on a new head gasket will not correct the cylinder wall damage. Your goning have to hone the wall and put new rings on. Maybe good to bore the cylinders out and have them all redone. Don't feel bad though, I have to do the same thing. I'm just going to get a rebuilt powerhead though.

 

[andy6374]

Re: Force 90 Outboard Ran Hot

Sorry to hear about your misfortune, it happens. It happened to me the first year I owned a boat. Oil injection failed....BOOM need a rebuild.<br /><br />One saying that is popular amongst the rest of the world is especially true for boat people.<br /><br />"If only I knew then, what I know now!"<br /><br />-good luck<br />andy