Pcm 40 1:1 woes

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   OK, I have a non correct craft boat with a pcm 40 1:1 transmission...  I know I know.. 

The boat has 1200 hours and runs great with good compression. (it's a 92) 
The transmission spins forward when in neutral but I can stop it by putting pressure on the flange with my boot. (propshaft is disconnected) it's seems like it takes a little more friction to stop than it should however. There also seems to be some gear noise when the tranny  is put in reverse whereas forward is totally silent. 
Is this normal and if so, is this tranny worth fixing the front seal that is leaking? I'm not too interested in totally rebuilding this thing given the cost vs sourcing a good velvet.
 I have a velvet sitting on the bench I could drop in it,  but would like to keep the pcm 40 if I can. 
What do you guys think?   

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Eether Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: October-20-2015 Location: Greenville Status: Offline Points: 64	Post Options Post Reply Quote Eether Report Post Thanks(0) Quote Reply Topic: Pcm 40 1:1 woes Posted: March-22-2016 at 2:50pm
	OK, I have a non correct craft boat with a pcm 40 1:1 transmission... I know I know.. The boat has 1200 hours and runs great with good compression. (it's a 92) The transmission spins forward when in neutral but I can stop it by putting pressure on the flange with my boot. (propshaft is disconnected) it's seems like it takes a little more friction to stop than it should however. There also seems to be some gear noise when the tranny is put in reverse whereas forward is totally silent. Is this normal and if so, is this tranny worth fixing the front seal that is leaking? I'm not too interested in totally rebuilding this thing given the cost vs sourcing a good velvet. I have a velvet sitting on the bench I could drop in it, but would like to keep the pcm 40 if I can. What do you guys think?

shierh Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605	Post Options Post Reply Quote shierh Report Post Thanks(0) Quote Reply Posted: March-22-2016 at 3:20pm
	Drain the fluid and pull the screen if it has one and lets see what that shows. You didnt say how long you had it and what changes in sound you are hearing.

Eether Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: October-20-2015 Location: Greenville Status: Offline Points: 64	Post Options Post Reply Quote Eether Report Post Thanks(0) Quote Reply Posted: March-22-2016 at 3:51pm
	The boat is new to me so I don't really have anything to compare to. The po said his mechanic thought it needed a new transmission because it was stuck in reverse. After looking into it I think that was due to linkage being out of sorts because it shifts fine with the cable disconnected. I'll drain it tonight and see what it looks like.

8122pbrainard Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045	Post Options Post Reply Quote 8122pbrainard Report Post Thanks(0) Quote Reply Posted: March-22-2016 at 4:47pm
	Ethan, It sounds like a classic case of a dirty neutral but, with no load on it's output, it doesn't take very much to spin them. The common cause of a dirty neutral is warped clutch plates typically from an overheat. In your case, it just may be from the no load and a slight drag between the plates. I highly doubt you will find any contaminants in the bottom of that case. Do smell the ATF checking if it smells burnt. The reverse noise is simply the planetary gears spinning. Sounds like the PO had a fantastic "mechanic"!! I wonder if he worked out of his back yard?
	54 Atom 77 Tique 64 X55 Dunphy Keep it original, Pete <

Eether Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: October-20-2015 Location: Greenville Status: Offline Points: 64	Post Options Post Reply Quote Eether Report Post Thanks(0) Quote Reply Posted: March-22-2016 at 10:19pm
	Ha, don't knock the backyard mechanics to hard Pete, I know some pretty good ones! The fluid doesn't smell burned fwiw. At this point I think I'll just see what it does in the lake this weekend. I needed to replace the cutless bearing, and if the tranny needed to come out right away it looked easier to push the propshaft forward out of the way. Pulling it out wasn't too bad anyway. Double tapered shafts are nice!

t.franscioni Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: February-13-2015 Location: Salinas, CA Status: Offline Points: 68	Post Options Post Reply Quote t.franscioni Report Post Thanks(0) Quote Reply Posted: March-24-2016 at 8:28am
	I just rebuilt my PCM 40 1:1 tranny. Had never done it before so I bought a rebuild manual, a clutch plate kit and a seal gasket kit from nautique parts and ski dim. Kind of hard for me to make sense of the manual just by reading it but once I started opening up the tranny it all made sense. All in all it was a very easy process to install the new clutch plates and new gaskets and seals. Prior to rebuilding my prop would turn in neutral also and the manual said what the other fellow above said which was worn or warped clutch plates. At 1200 hours I would imagine that is common to have to rebuild your tranny. Mine was almost 700 hours and out of a 14 year old boat.

Pcm 40 1:1 woes

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