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Author Topic:   Johnson O/B problem
ChrisK posted 01-30-2001 01:44 PM ET (US)   Profile for ChrisK   Send Email to ChrisK  
I thought I would throw this out for discussion since everyone seems to be real knowledgeable on most topics presented here. I was out fishing Saturday in the Louisiana marsh on our 19' Outrage and had a problem with the 150 hp Johnson. We were up on plane running about 75% full throttle (30mph) and the engine slowly dropped and then shut off. This happened three times and I decided not to chance it and slowly went in at 5-10 mph. It made a rattling sound when we increased the throttle after that, so it made me nervous. We called a local shop and they said it may just be a water pump. Any ideas?? How much should that cost to replace/repair? Any info is appreciated. Another question, who makes a plug that fits the transom holes and bow and bilge holes? I find that the ones that are on the boat let a little water in.
hauptjm posted 01-30-2001 03:28 PM ET (US)     Profile for hauptjm    
First whaler used a larger diameter hole than 1", the most typical. Shoreline marine offers larger plugs. Secondly, I would agree the first thing I would check is the water pump. Check some obvious things like the water temp coming out of the engine; (assuming you have a stream) it should be fairly warm to the touch. If it isn't warm, you have a pump problem. If the pump proves to be working, you may have either an ignition problem or a fuel flow problem. Not knowing the year of manufacture, ignition could be of the points and condenser variety or electronically controlled. Fuel flow would probably be from a restriction, since the engine would run at lower speeds. Check filters first. I have heard that if water, no matter how small, is getting into the combustion chamber, then the engine could run, but not at any kind of RPMs. If this is the case, then your troubles are high on the cost scale.
triblet posted 01-30-2001 04:01 PM ET (US)     Profile for triblet  Send Email to triblet     
I'm inclined to think fuel supply. Kinked
hose, junk on the pickup, fuel filter.
Been there (first two). Also, if it's
sucking air into the fuel line, you'll get
the same symptom. If there's a quick release
at the tank, suspect it.

If you didn't have water flow, it would
SMELL hot and look steamy (been there - kelp
around the intake -- Everrude has an
automatic shutoff when it gets hot.)

And pull the spark plugs -- if there's water
in there, you'll probably be able to see it
as condensation. Been there too, but not on
an OB.


Clark Roberts posted 01-31-2001 08:51 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Chris, my advise would be to check compression first! This is like an EKG for the engine and will indicate if the mechanicals are ok! If so, then proceed to check carb/fuel systems, ignition and cooling. You could have a broken ring, piston or severe carbon build up! If compression is down , pull both heads and inspect all! Above all, don't run the engine until problem is properly diagnosed! Good luck... Clark

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