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  • 1 Post By jimgo
  • 1 Post By Norstar
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  #1  
Old 04-17-2014
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Rear oil seal

We have developed a leak on our rear oil (transmission) seal. The fluid leaks out and then sprays 360 degrees in engine space when shaft spins! Yikes!!!
Does anyone have any experience replacing the rear seal and O ring without pulling the transmission? Looks pretty tight down there with not much room to work. Can get the coupling apart but access to seal is limited. We have a 1990 PSC 34 with the Yanmar 3HM35F engine and a Kanzaki KBW10 gear. Our gear takes ATF fluid and there is no noticable loss of fluid on the dipstick at this point. Caught it early on so transmission ok so far. Just starting our charter season so timing not good but do not want to run like this until repaired!!!

Thanks,

John Schwab
PSC 34 #201
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Old 04-17-2014
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Re: Rear oil seal

John, with as small as the transmissions are, is there a reason you don't want to remove yours? As you point out, there isn't much room to work in the engine "room"; why not make things a little easier on yourself? Granted, you may have to realign the engine once the transmission is back together, but that doesn't seem like it will be THAT difficult.
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Old 04-17-2014
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Re: Rear oil seal

We have removed (and replaced) the transmission on our 3HM35F/KBW10.

(By my now 7 year old memory)

Break the prop shaft coupling and slide the shaft back a little
Disconnect the shift cable (mark the hole in use)
Take the top nuts off the back engine mounts
Jack up the back of the engine with a small jack under the oil pan
Slip some wood scraps under the engine and rest it on them wedging it in place
Unbolt and remove the transmission

It was not a particularly hard thing to do although the splined shaft was hard to withdraw and we ended up unbolting the damper disk from the flywheel.

Bill Murdoch
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Old 04-17-2014
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Re: Rear oil seal

Hi John,

We had ours replaced in Port Angeles on the same transmission without pulling it for $65. It took the guy about 30 minutes. You will need a special wrench to get the trans coupling nut off. The seal was cheap. I don't recall an O-ring. I have drawings and part numbers (seal and wrench) if you want them. The guy showed me how to do it so I can handle the job myself if needed in the future.

Dave Mancini
PSC34 #305 Swan

Last edited by DaveMancini; 04-17-2014 at 09:47 AM. Reason: addition
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Old 04-17-2014
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Re: Rear oil seal

Had mine replaced on my 3GM by a mechanic. He took the entire tranny out and brought it to his shop. It looked like a big job doing all that and cost me about $750.

Dave's solution sounds so less painful.
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Old 04-17-2014
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Re: Rear oil seal

Dave, I was hoping to accomplish without pulling the transmission if possible like in your case. I have the seal and O ring on the way. Had a good parts diagram in the engine manual. The O ring goes in after coupling and lock nut according to the diagram. Only about $7 worth of parts! The special tool to remove the coupling nut will be required if you can send me some info on that. I'll give it a shot and see how much trouble it will be. Removing the old seal is the challenge in tight quarters without screwing up the housing. Don't think a seal puller can be used plus the shaft spline is protruding as well.

Thanks for all the replys!

John Schwab
PSC 34 #201
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Old 04-17-2014
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Re: Rear oil seal

John,

The special wrench is part number 177099-09010. It's not cheap. Since I posted, I remembered that the O-ring was missing when the guy pulled the seal and he didn't see the purpose for it so he didn't put one back in. It looks like it's intended to keep fluid from migrating past the seal on the outside where it fits against the seal housing. I worried about his not having put it in, but I haven't have any leakage, but if you can get it in, all the better.

The seal came right out. It's not pressed in. The guy had a pick and a paint can opener for removal tools. He showed me how either one would have worked. The hard part is working in the space between the trans coupler and shaft coupler. Much depends on how far you can slide the shaft aft to make space. You will have to pretzel down so you can see to work or use a mirror (neither me nor my guy had to use one). Clean the shaft if there's any crud on it before sliding it aft to keep from tearing up the packing in the packing gland.

Use a pipe wrench on the trans coupler braced against the hull to hold the coupler so you can wrench on the nut. The nut is normal right hand thread (counter-clockwise to come off), unlike some boat transmissions.

The nut should be caulked after replacing it to keep it from loosening when in reverse. The caulking doesn't keep it from loosening when you get on it to remove it with the wrench, though. The dimple isn't that deep.

Forgive me if I'm telling you stuff you already know. Just trying to cover what I remember. Good luck. Let me know if you need anything else.

Dave

Last edited by DaveMancini; 04-17-2014 at 06:44 PM.
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Re: Rear oil seal

John,

Hopefully, you can borrow the wrench. There is a webpage with a good picture of a wrench a guy made for the nut. It is obviously not as strong as the tool from Yanmar, which is really heavy duty, but it might work I suppose (I think the torque required is 60–80 lbs.). There are also some good pictures of the nut, etc.

Island Packet Photos (3JH2E Transmission Output Coupler - Album_ID 1596)

I would send you my wrench if I weren't in Mexico.

Dave

Last edited by DaveMancini; 04-17-2014 at 06:55 PM. Reason: error
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Old 05-10-2014
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Re: Rear oil seal

Mission accomplished. Was able to replace rear seal without removing or lifting up rear of engine. Took me a bit longer than Dave's mechanic as I was hoping for a quick 2-3 beer job. Took me more like 6 hours and a 12 pack!!! Thanks Dave for the helpful information and part #'s.

John Schwab
PSC 34 # 201
Norstar
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Old 05-10-2014
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Re: Rear oil seal

Now another person who knows how to do this keep him on file so he can help others. Dn'to not expect me to help, I have done easy fobs like replacing universals at -20 degees farinheit in the snow and i won't do that again without threat of death.
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