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Rear Transmission Leak 40A

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    Posted: Yesterday at 9:17am
I seem to have a small transmission leak at the rear of my transmission.  Seems to be between the coupler and the transmission.  I am guessing rear seal?  Is that a difficult job?  Could it just be an alignment issue?  I just did the rear main seal on the engine and that is when the leak showed up... I am hoping it is just not aligned properly...

Thank you all in advance!  I am not a year into my 91 Nautique ownership and have had a blast reading and learning from this forum!

Ryan
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91 Ski Nautique
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Fl Inboards Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 9:31am
Not a difficult job. however a metric socket to get the flange coupling off will be necessary. also the socket may need to be turned down to fit. finding a seal may be difficult as if memory serves me it was a proprietary seal for PCM . DIM may have that seal..
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Post Options Post Options   Thanks (1) Thanks(1)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 9:52am
40A output shaft seal:



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bamanautique91 Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 9:56am
I ordered this from Nautique Parts


I noticed the bolt had a little key/indentation built in.  I assume I just bend that back out, back out the bolt, pull the coupler/Flange and the seal will be right there?  I just pull the old and put in the new?  Similar to the rear main seal I just did?  Thanks again for all the help.  

Should I try just checking the alignment before going into it?  I ran it for a brief time before I noticed the leak.  Or will it not matter at this point and I just need to put in a new seal?  

One more question.  Do I have to remove the transmission or can this be done while it is still connected to the motor?
Ryan

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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 5:55pm
I'd jack up the engine like you probably did for the rear main seal job, so that you can have some working room.

It's a 36 mm socket and if you have an impact wrench that goes to at least 150 ft lbs of torque, you can rattle it right off. If not you need a tool to hold the flange and a breaker bar and some muscle to get it off.

Here's a link to a PCM 40A manual that should be helpful Wink


As far as alignment, you could check it.....it sounds like you didn't check it when you did the engine seal.

I don't think the alignment getting done will stop the leak, but you never know.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 6:53pm
Originally posted by KENO KENO wrote:

 
I don't think the alignment getting done will stop the leak, but you never know.

I'd have to sy if a misaligned engine/prop shaft causes a radial loading enough to cause a leak, then I'd also have to say there is a trans output bearing problem too. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 7:44pm
Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by KENO KENO wrote:

 
I don't think the alignment getting done will stop the leak, but you never know.

I'd have to sy if a misaligned engine/prop shaft causes a radial loading enough to cause a leak, then I'd also have to say there is a trans output bearing problem too. 

I was being nice, Pete was being a little less nice and I'll be a little more "less nice", your transmission would probably be toast Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bamanautique91 Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 7:55pm
Originally posted by KENO KENO wrote:


Originally posted by 8122pbrainard 8122pbrainard wrote:


Originally posted by KENO KENO wrote:

 
I don't think the alignment getting done will stop the leak, but you never know.



I'd have to sy if a misaligned engine/prop shaft causes a radial loading enough to cause a leak, then I'd also have to say there is a trans output bearing problem too. 


I was being nice, Pete was being a little less nice and I'll be a little more "less nice", your transmission would probably be toast Wink


Thank you all for the replies. The transmission works as it should and makes no noise. Just a drip or two of fluid. I'll see about trying to pull the flange off and replace the seal. When I do the alignment I make sure the shaft is set in the groove before taking measurements correct?

BTW no feelings can be hurt here. I'm the dummy that didn't check alignment. It wasn't leaking until I did the rear main seal and put it back together.
Ryan

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Post Options Post Options   Thanks (1) Thanks(1)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: Today at 6:55am
I think I'd call Joe at FFI marine and see about parts, since there's also an O ring that may need replacing.

He seems to have some parts that are hard to find for these transmissions and you just know that if you don't have an O ring on hand, you'll inevitably screw up the old one and it'll be a strange size that's hard to find Wink

Look at the manual linked earlier on page 15 for removal of the coupling and flange, and also page T5-2 for an exploded view.

FFI marine phone number 330-273-8291
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bamanautique91 Quote  Post ReplyReply Direct Link To This Post Posted: Today at 7:20am
Originally posted by KENO KENO wrote:

I think I'd call Joe at FFI marine and see about parts, since there's also an O ring that may need replacing.

He seems to have some parts that are hard to find for these transmissions and you just know that if you don't have an O ring on hand, you'll inevitably screw up the old one and it'll be a strange size that's hard to find Wink

Look at the manual linked earlier on page 15 for removal of the coupling and flange, and also page T5-2 for an exploded view.

FFI marine phone number 330-273-8291

Thank you Keno,  I didn't see that o-ring.  I see SKIDIM has it as well. I appreciate all your help.
Ryan

91 Ski Nautique
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Post Options Post Options   Thanks (1) Thanks(1)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: Today at 7:36am
Yep, they do R047192.

I'd still call Joe and talk with him about the job and any little gotchas.

Sometimes those couplings come off kinda hard. Even the manual mentions a puller or jacking tool

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