1984 force 125 low compression question?

[slimmer57]

I still gotta figure out the compression issue but some people said spray wd-40 to get the rings lubed before doing it?

 

[topgun3690]

It's your motor you can do what you want......WD-40 is good but I don't think it will fix your compression problem. 30-40 PSI tells me it is time to take a look.....snake camera in the plug hole or remove the head. It won't hurt anything to try the WD-40 and find out for yourself if that will work or not. If the cylinder is scored/damaged already it will not make any difference.

 

[slimmer57]

It's your motor you can do what you want......WD-40 is good but I don't think it will fix your compression problem. 30-40 PSI tells me it is time to take a look.....snake camera in the plug hole or remove the head. It won't hurt anything to try the WD-40 and find out for yourself if that will work or not. If the cylinder is scored/damaged already it will not make any difference.

Ok thank you for all the help !

 

[brodmann]

topgun3690
I know how to read. I disagree with Jerry. Check valves in a fuel pump have nothing to do with the gasket either.

 

[topgun3690]

Well, I believe jerry knows what he is talking about....and I agree with him that the fuel pump will not cause loss of compression like the OP is seeing......that's my take on it.

 

[jerryjerry05]

Spray WD in hole before taking comp reading??
At 30# WD ain't gonna bring the comp up enough to help anything.
Like I suggested before: snake camera, someone suggested remove the head? that's the next step.

 

[slimmer57]

Well here’s the verdict after hours of prying breaking blots and welding and heating I got the head off cylinder 3 looks good but the head gasket dosnt had a little blow out

Now I can either put piston rings as well or just put it back togeather and let it ride

 

[topgun3690]

Think you got lucky there.....cyl#3 looks good in your pics, from what I can see. How many head bolts broke off?

 

[slimmer57]

Think you got lucky there.....cyl#3 looks good in your pics, from what I can see. How many head bolts broke off?

5 broke but manage to get them all out without messing up too much

 

[The Force power]

Now I can either put piston rings as well or just put it back together and let it ride

Does it need it ???
Clean all mating surfaces & install new gasket, check the compression

 

[slimmer57]

Does it need it ???
Clean all mating surfaces & install new gasket, check the compression

Honestly there at 105 each cylinder besides the one with the blown gasket and was running fine so I’ll probably put some marvel mystrol oil in it until parts get here and put in back togeather

 

[slimmer57]

Only question I got now is someone made a fitting that sprays water out the side should I plug it off or leave it?

Comes out the top of the head and let’s water out through the side of the outboard case

 

[topgun3690]

Only question I got now is someone made a fitting that sprays water out the side should I plug it off or leave it?

Comes out the top of the head and let’s water out through the side of the outboard case

If it works (pees water out) I would leave it be.....gives you a visual that your water pump is working. A lot of owners have added a telltale if it didn't come with one originally.

 

[The Force power]

Honestly there at 105 each cylinder besides the one with the blown gasket and was running fine so I’ll probably put some marvel mystrol oil in it until parts get here and put in back togeather

No need for "snake oil" (unless it makes you happy for some reason & enjoy a smoke show.)
DO however;
- Get another gauge to check your compression readings
- Clean/check the recirculating hoses & fitting (are check-valves)

 

[jerryjerry05]

MMO not used often in the marine industry.

 

[slimmer57]

Ahh ok now what’s the purpose of the cover on the outside of the head? Doesn't looks like water or anything goes in it

 

[slimmer57]

Also would you use any type of rtv on the head gasket as well?

 

[flyingscott]

topgun3690
I know how to read. I disagree with Jerry. Check valves in a fuel pump have nothing to do with the gasket either.

Explain to us how the fuel pump will cause low compression please?

 

[flyingscott]

Ahh ok now what’s the purpose of the cover on the outside of the head? Doesn't looks like water or anything goes in it

That should be the water jacket. When its running that will fill with water

 

[slimmer57]

That should be the water jacket. When its running that will fill with water

But with not gasket? Seems werid