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  140 Johnson, Should I buy it?

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Author Topic:   140 Johnson, Should I buy it?
Austin Whaler posted 06-30-2009 10:24 AM ET (US)   Profile for Austin Whaler   Send Email to Austin Whaler  
There is a 140 hp Johnson, for sale about an hour away from me. It is a 1979, which is old but it was just rebuilt. The posting says Upper and lower engine rebuilt. Which I assume means The powerhead and the lower unit. It said that it needs a new waterpump and the carbs need to be cleaned. I can do this work myself. It is for sale for $250 or best offer. Is this even worth going to look at? I am 15 so i need to rely on somebody bringing me. It would work great on my 1973 19 outrage that I am restoring. Or should I just get my 115 merc. tower running and use that?

Thanks in advance for any replies.

Blackduck posted 06-30-2009 10:52 AM ET (US)     Profile for Blackduck  Send Email to Blackduck     
If the motor were any good, I don't think they would be selling it so cheap. $250, or best, why not just give it away? I would stick with what you have, or buy something in running condition, with good compression.
Tohsgib posted 06-30-2009 11:41 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
For 4250 it is worth looking at but if it was worth a squirt it is already gone.
Blackduck posted 06-30-2009 11:53 AM ET (US)     Profile for Blackduck  Send Email to Blackduck     
999 out of a 1000, never have found #1. Just what this young man needs is a rebuilt that I assume, won't start. Sure, go look, probably worth the asking price in parts, if that's what he wants to get involved in.
towboater posted 06-30-2009 01:59 PM ET (US)     Profile for towboater  Send Email to towboater     

First thing you need to do is buy a compression tester, jumper cables, a good battery that will eventually go into the boat and muffs to cover the water intake. You will use all these tools your entire boating life and should save you hundreds of dollars and many hours.

Seek a used engine with nearly equal compression in all cyls no less than 110 ea. No matter what you are told, your personal testing will confirm this.


Tohsgib posted 06-30-2009 02:07 PM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Scratch the 110 rule though. Many outboards are low compression engines and gauges will vary a lot. My fresh 225 only had 100 in each cyl. I have seen smaller outboards with only 90. Most I have seen was my 40hp with 148 in both. My 115 Tower had 120's and that was actually low and she made less hp. Equal compression is key but sometimes even that can fool you.
Blackduck posted 06-30-2009 02:35 PM ET (US)     Profile for Blackduck  Send Email to Blackduck     
Nick is right, most of the older OMC's didn't have 100 pounds of compression the day they left the factory, that 140 would be fine with 85, even, in all 4 cylinders.
towboater posted 06-30-2009 02:48 PM ET (US)     Profile for towboater  Send Email to towboater     

Doing books today...

Mr Big,
Would you agree a used engine with 110 should be expected to last longer than a engine with 90?

One other question, should Austin test cold or warm for best results?



Blackduck posted 06-30-2009 03:05 PM ET (US)     Profile for Blackduck  Send Email to Blackduck     
I'm just plain bored today, so I'll bite. As far as I know, all specs are based on performing compression tests on engines when they are warm. As far as 110 or 90, I would rather have an engine that meets factory specifications, regardless of what those numbers are.
Tohsgib posted 07-01-2009 11:48 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
The more the compression the more strung out or intolerant the engine is. An engine with factory spec of 90 would probably run on monkey [vulgar language deleted] and last a lifetime. Jetski engines have like 175 and you know reliable they are. I do mine cold and no throttle. This way it will give the worst reading in my opinion. Once warm the rings expand, etc showing a better reading.
towboater posted 07-01-2009 01:16 PM ET (US)     Profile for towboater  Send Email to towboater     
thx big.

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