Johnson 10 hp

[grousehunter 61]

I just picked up two Johnson 10 hp motors one is a 1955 and the other is a1958. The 58 has a seized piston in the top sleeve, I let it set with WD 40 for 3 or 4 days, pulled the head today, quite a bit of rust in that bore, any ideas on how to free it up without busting it up.......

 

[Vic.S]

Re: Johnson 10 hp

Might try soaking in a proper penetrating oil such as PB Blaster (WD 40 is a water displacing fluid... hence WD)

Then just gently tap it one way then the other until it moves.

 

[grousehunter 61]

Re: Johnson 10 hp

No manual.... got it loose this morning, by hitting the piston with the wooden handle of a heavy hammer, but it still has a problem. Are the top ends of a 1955 and a 1958 the same. I may rebuild the 55 as it seems to be free when I pull the rope starter. The 58 looks great, nice paint for its age, the 55 looks like its been rode hard and put away wet.

 

[grousehunter 61]

Re: Johnson 10 hp

Never mind, I pulled the motor apart this morning, found the lower bearings seized on the crank, also one of the o-rings was missing on the crank. Anybody know how many roller bearings are on the rod end, I have 58 but I think some may have escaped.

 

[jrs_diesel]

Re: Johnson 10 hp

My 72 6HP has a total of 60 needles (30 per connecting rod). Not a 50's outboard I realize, but I think that should be right.

 

[grousehunter 61]

Re: Johnson 10 hp

That sounds right, I guess tomorrow I will crawl around on my hands and knees in the shop to see if I can come up with any more. I didn't know that they were loose in there and just pulled it apart, wrong!!!! when I pulled the second one I kept them on the rod, but like a dumb s##t I didn't count them. I was going to buy a manual, but they are out of them, so I guess I'll just fly by the seat of my pants. Thanks for the reply.....I have been in the shop all day or would have replyed sooner.

 

[6hpboat]

Re: Johnson 10 hp

Something that works well is a product called carb out... But any car valve cleaning product you place in your gas , should be ok.

Don't mix with gas... just pour pure on pistons for 24h.

oops you fixed... sorry about that.