1990 force 150 pistons

[Shifflett115]

I have a 1990 force 150 that ate 2 pistons due to the timing going out of wack , I fixed the timing issue so it won’t happen again , here’s my question , I have another 150 block , pistons , can I take two pistons and rings out of that block , hone the cylinders on my other motor and install them ?

 

[Jiggz]

You can if the pistons and rings on the "cannibalized" engine are of the same size. There should be a stamped on the piston head to indicate if it's still the standard size or if it's oversized already and the compare that with the engine you are fixing.

 

[Shifflett115]

I checked them , they are standard size , the same as the other engine

 

[jerryjerry05]

If the new block is good???
It's easier to swap the blocks than change 2 pistons.

FrankA used to change the pistons without taking the block apart or even taking the
head off the base.
Frank was AMAZING!!
I tried it and ended up taking the motor apart

 

[Shifflett115]

Frank was the one that showed me hot to replace the pistons without taking the block apart , he was an awesome guy , the block has a little surface rust in the cylinders that’s why I was going to take two pistons out of it

 

[Nordin]

I have replaced a piston in three engines with out take the block apart, two Chryslers one 70 and one 75Hp then one Evinrude 3 cylinder 60Hp 1993.

The Chryslers is a PIA to do it, BUT you can do it with patient, many tries and maybe some bad language.
The Evinrude was really easy, no problem at all.
The different is that Evinrude has the rollers in the bearing cage and they will not come loose, Chrysler has loose rollers and you must put some grease at each roller to hold it in place.....there are 16 of them at each connecting rod.

 

[flyingscott]

I have replaced a piston in three engines with out take the block apart, two Chryslers one 70 and one 75Hp then one Evinrude 3 cylinder 60Hp 1993.

The Chryslers is a PIA to do it, BUT you can do it with patient, many tries and maybe some bad language.
The Evinrude was really easy, no problem at all.
The different is that Evinrude has the rollers in the bearing cage and they will not come loose, Chrysler has loose rollers and you must put some grease at each roller to hold it in place.....there are 16 of them at each connecting rod.

How did you get the pistons out of the evinrude without taking it apart?

 

[Nordin]

Flyingscott .... I removed the three carbs and the intake manifold, then you reach the connecting rod.
Unscrew the lower connecting rod assembly and removed the bearing cage with rollers.
Removed the head and pushed out the piston.
This piston had melted and it was a hole in the top at the ring land.

Put in a new piston with new rings after I had hone the bore.
Reassembled the connecting rod with the bearing cage and rollers, the head and the intake manifold and at last the carbs.

Checked the compression after that and all three were at about 135 PSI.

Runs as good as ever.

 

[Jiggz]

I checked them , they are standard size , the same as the other engine

With good engineering practice, personally, I'll at least replace the piston rings. De-glazed the cylinders it's going to and make sure you do a proper break in when you're ready.

 

[jerryjerry05]

If all that's wrong is a little surface rust?
I'm not sure I'd change anything??
Spray some PB Blaster and a green scrubbie and put the head back on it.