Compression check.....'59 50 Johnson

[Alws55]

Compression checked cold: 78, 78, 78 75 pounds per cylinder. Is this a tired motor ineed of work , or will it run satisfactory, decent or poor?

 

[tashasdaddy]

Re: Compression check.....'59 50 Johnson

when was the last time it was ran?

 

[JB]

Re: Compression check.....'59 50 Johnson

That seems low, Alws, but they are all close, which means the readings may be the result of the guage or technique.<br /><br />If it were mine I would say that compression is slightly suspect but not a problem.

 

[Alws55]

Re: Compression check.....'59 50 Johnson

They ran the motor last November or December. It ran fine and revved up without any hesitation.

 

[OBJ]

Re: Compression check.....'59 50 Johnson

Why not try a decarb Alws and then retry the compression test? Although it "might be" just a tired engine, can't hurt......

 

[Alws55]

Re: Compression check.....'59 50 Johnson

Thanks for the replies fellas.......I'd like to buy this motor....I'll have to drive 1000 miles round trip...I guess if I have a couple Jim Beam's and sleep on it the feeling might go away....aarrrgghhh!

 

[Paul Moir]

Re: Compression check.....'59 50 Johnson

Those are stout engines, but you are aware of the legendary fuel consumption right?<br />Just makin' sure.

 

[OBJ]

Re: Compression check.....'59 50 Johnson

Nothin' wrong with a little Beam......

 

[R.Johnson]

Re: Compression check.....'59 50 Johnson

Do not drive a 1000 miles, I have been offered these engine's for free, and turned them down. That engine is so outdated, it should not even be a consideration. There is hardly an engine out there in it's horsepower class that won't out perform it, and with alot less troble, and exspense. That engine should be classified as an antigue, and even old by that standard.

 

[surlyjoe]

Re: Compression check.....'59 50 Johnson

well the fat 50's are pretty rare , and some folks like them. they are pretty unique looking. anyway 75 is OK, I had a v-75 that had 75psi across the board and ran great..

 

[Solittle]

Re: Compression check.....'59 50 Johnson

I talked to a couple of BRP techs at the Miami Boat Show about decarbing older engines. They advised against it as it can cause seals to leak. Especially avoid the long soaks as some will recommend. They did encourage the use of Ring Free or other like fuel additive.

 

[ledgefinder]

Re: Compression check.....'59 50 Johnson

Not OMCs finest hour.<br /><br />In it's day, the back-to-back comparison between the Fat50s & the same era Merc (44ci four was 45hp then?) must have been brutal. <br /><br />You can easily put the Merc on the transom yourself, and the 44s have that wailing upper midrange. The Fat50 just looks like a big old ox. I do like the 4 fake 'spaceship' exhaust pipes on the 1958 Johnson though.