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Author Topic:   1988 Johnson 150: To Rebuild or Not?
johnson 150 posted 01-14-2004 09:28 PM ET (US)   Profile for johnson 150   Send Email to johnson 150  
I have a 88 model 150 gt johnson the left hand side bottom cylinder had no compresson I pulled the head off and cylinder and piston both are bad piston. beat all to pieces. cylinder has scares can it be sleeved. the rest of the cylinder have 90 lbs of compresson hate to bore all. does any one have any sugestions on what probally happend to the cylnder. piston is still all together but sloppy side to side like the skirt are gone and where a cheap place for parts.
whalersman posted 01-14-2004 09:39 PM ET (US)     Profile for whalersman  Send Email to whalersman     

You can bore one cylinder and replace just the one piston these days..
This allows you to just replace the one piston as it is balanced to the rest of the smaller pistions..

Clark Roberts posted 01-15-2004 10:07 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Johnson, in my opinion you will be wasting your money to repair that engine. It may be worth more for parts (if any are good (like lower unit and trim/tilt unit) than running.
These engines (per my experience with a three 150hp OMC's, and one 175hp)
are prone to powerhead failure (cracked rings, chipped pistons etc.) and are heavy, low on power and drink gas like a drunken sailor. I'm not trying to trash you motor but to level my opinion for what it's worth and maybe save you some heartache and future, eminent breakdowns. At least explore the idea of a later model engine in good condition! Happy Whalin'... Clark... Spruce Creek Navy
PS> others will no doubt have some different advice and suggestions
Sal DiMercurio posted 01-15-2004 11:49 AM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
To just repair only 1 hole is nuts.
The engine is 16 years old.
If you do decide to repair the engine, do them all or you will be doing them in the near future.
It will cost you close to $4,000 to have it done right.
You can get a new 2001 or 2002 ....150 hp Evinrude for around $6,800, just $2,800 more then having a repaired 16 year old engine, plus the fuel economy of the DFI engine would darn near make up the difference in a few years if you use the boat much at all.
Sounds like the engine sucked a ring & just ground it up like a garbage disposal & left alot of damage.
If you didn't run engine tuner through that engine, you can kick yourself in the pants because the ring most likely broke because of carbon buildup between the rings & piston, causing it to break.
It's mandatory to use a carbon remover at least every 50....75 hours or you will have a broken engine as you have now.
Some people say, hell, i'v never used it & i'v got 4 years on my engine, when the truth comes out, he's only used the engine for 40 hours in that 4 year period.
If you don't use a carbon remover, expect to rebuild your engine within 300 hours or very near to it.
Tom2697 posted 01-15-2004 12:36 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
As the others have said, you can repair that motor but it will still be 14 years old. Even with a new powerhead, that motor won't be worth as much as you will spend repairing it since the lower unit, trim/tilt, starter, etc. will still be 14 years old. If you can do the work yourself or can find someone to do it for you CHEAPLY, go ahead and fix it. But remember this, you will probably have another problem again soon. I repaired my '89 Evinrude 150 powerhead and got another 300 hours out of it but in that time, I had to replace the fuel pump, trim/tilt motor, and various other small items that quickly added up.
Bigshot posted 01-16-2004 11:41 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Either stuck ring or bad lower seal and she was ingesting water into lower cyl. Was piston pretty clean compared to the others?

Not worth rebuilding. It aint the parts that cost the money, it is having it sleeved, the others at least honed and new rings and bearings. Even if you do it yourself, it will run close to a G for parts. I would NOT recommend doing it yourself. EVERYTHING is ultra critical like clearences and torque specs. Mess one thing up and BOOM! Better off buying a used 150 with a bad foot or a newer used one with the 60 degree block, etc.

Steve Leone posted 01-16-2004 11:02 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Worth more dead than alive....
homey posted 01-16-2004 11:19 PM ET (US)     Profile for homey  Send Email to homey     
Johnson 150,

I have twin 89 Johnson 150's. I had the starboard motor(low compression) rebuilt last year. It runs great, put 120 hours on it, and no problems. Several offshore trips, trolling all day, no problems.

I run them easy, never wide open, and decarb regularly. Also regular maintenance, plugs, filters, and water pumps etc. Fuel isn't a problem when my buddies fill the tank... I plan on getting at least 4 more seasons out of these motors. Homey

jimh posted 01-17-2004 12:08 PM ET (US)     Profile for jimh  Send Email to jimh     
[Changed TOPIC; was "bad cylinder no compresson (sic)."]
greyg8r posted 01-17-2004 05:17 PM ET (US)     Profile for greyg8r    

If you can do the work yourself, short of the machine shop work, you can get out of this for less than $800, quite a bit less if you bore just the one cylinder and replace just the one piston.

Depending on your circumstances and the condition of the rest of the engine, that could make good sense.

There is a company here in Florida that will overhaul an engine for $2200 and there are companies that sell overhauled powerheads for $1200 (does not include installation).


juanjuice posted 02-05-2010 11:08 AM ET (US)     Profile for juanjuice  Send Email to juanjuice     
[After this discussion had been dormant for six years, it was revived to say that] 90-PSI is good for the other cylinders. [Changed TOPIC to solicit business for himself. Please note that the website is not to be used for self-promotion. Please review the guidelines for posting articles. It is not particularly handsome to revive discussions which have been dormant for six years only for the rather transparent purpose of promoting your business--jimh]
Tohsgib posted 02-06-2010 09:40 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Hey Juan...ya might want to look at dates. I doubt he is interested in you rebuilding his engine 6 years after it blew up.
Martino posted 02-06-2010 03:48 PM ET (US)     Profile for Martino  Send Email to Martino     
A decent rebuild might not cost much more than a repair on some of these new fangled engines, with their HPDI's, turbochargers, high pressure pumps, low pressure pumps, electronic injectors, ECU's, and owner's cash sensors.
Tohsgib posted 02-07-2010 08:29 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Yeah but they still suck....down fuel, smoke, and have zilch for resale. You are better off finding a nice used 4 stroke or DFI.

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