2001 Johnson 90 hp - oil pump failure-engine locked up

[iluvoffshore]

I bought a 2001 Johnson 90 hp Oceanpro from a friend for small sum on a gamble I can repair it. I am told the engine gave good service until on a recent outing when it ran for 15 minutes before stopping. They managed to start it back up for a couple of minutes before it locked up. The shop told him the oil injection pump failed and a new powerhead was required. He said there was a hole in the cylinder but inspection shows none I can see so I think maybe there is a hole in a piston that was lost in translation. He elected to get a new motor and I have the locked up outboard. All I have done so far is take out the plugs and poured some oil in and put the plugs back in. The engine looks virtually new with the cover off. I have a good mechanical aptitude but have never been in the guts of a big outboard so I hope somebody that has been there done that can advise me on a few concerns. Is this project something a slightly above average Joe can tackle successfully with just a repair manual? Are parts available? Should I attempt a power head rebuild myself or belly up to the pump and pay for a factory reman? Lastly when I do get it running can I just mix the gas and not have to worry about the oil pump? All advise is appreciated!

 

[tashasdaddy]

Re: 2001 Johnson 90 hp - oil pump failure-engine locked up

pull the head, and see what is there. yes you can do it. you can easily convert it to a premixed motor. don't commit either way til you see what you have. correct manual is going to come from dealer. pricey, but worth the $.

 

[fishmen111]

Re: 2001 Johnson 90 hp - oil pump failure-engine locked up

WELCOME TO iboats!!! As TD said, get an OEM repair manual and pull the heads for inspection. It could be repairable or trash. Yes, you can do the rebuild if required, but need a full inspection first.

 

[iluvoffshore]

Re: 2001 Johnson 90 hp - oil pump failure-engine locked up

Thank you gentlemen. I will order a manual and get to work.

 

[Silvertip]

Re: 2001 Johnson 90 hp - oil pump failure-engine locked up

I would also suggest that you do a very thorough analysis of why the engine failed. Many techs quickly and incorrectly blame the oil pump for engine failure when in fact it is something else. The oil pump cannot be cylinder-specific when it comes to failure. If you find damage on just one cylinder chances are it was not the oil pump but a carb that is running too lean. Make sure you rebuild them and make sure the pump is pumping oil (run premix and the pump) during break-in and note that the oil level in the resevoir is dropping in relation to the amount of fuel used.