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Oil PCM Trans -problems |
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dyn 
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Joined: April-04-2012 Location: Europa Status: Offline Points: 4 |
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 Topic: Oil PCM Trans -problemsPosted: April-04-2012 at 7:11pm |
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Hi, i have a problem whith my transmisson.
In neutral the boat move forwards, the propeller moves... It maybe because the wrong oil in the trans? Is better to use: Titan Universal HD SAE 20W-20 API CF-4/SG or 20W-20 Super Dynamic API SJ/CF-4/CF, ACEA A3/B3, A3/B4, E2 or http://www.silkoleneoil.com/products/136/710oil-transmission-oils.aspx tnx for the answers and sorry for my bad english... 
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kapla
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Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Posted: April-04-2012 at 8:08pm |
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I know early trans called for straight 20w. but its more common to ran them with Automatic Transmission Fluid (ATF) TYPE DEX/MERC III, regular , no synthethic.
On the tranny you are having a dirty neutral. There´s no fix for that. Looks like you will need a rebuilt in the near future. Use it like that until it gets worst... |
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<a href="">1992 ski nautique
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: April-04-2012 at 11:18pm |
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What year is your transmission?
Also, I've seen PCM and B/W transmissions turn slightly forward while in neutral. My '96 has always turned forward slightly when starting (both the original transmission and a brand new one--the original one had some external torque stress, nothing internal, so replaced). It seems that they will sometimes turn slightly when in neutral (also experienced it with an old BW 1:1 in a different brand tournament boat many years ago). Kapla, what is the cause of a dirty neutral? I don't know enough about these transmissions, but I am assuming that the plates are somehow not separating enough. Still, that doesn't explain why I get some turning at start up, even with a new transmission. My transmissions was filled with Dextron III when it was new, even though the manual said 20w oil. Does anyone know if you can easily switch or have had experience switching from 20W to Dex/Merc type III? That would be helpful for everyone to know. |
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Gordon '97 Ski Nautique, GT40
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kapla
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Posted: April-05-2012 at 1:30am |
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i'd stick to the dex merc fluid.
as for the dirty neutral not sure whats the cause, probably eric will explain it better than me... |
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<a href="">1992 ski nautique
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eric lavine
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Posted: April-05-2012 at 8:26am |
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true cause is from the forward clutch pack slipping and the plates cannot dis-appate the heat quickly enough, thus the heat captured in the plates will cause them to warp, the forward pack runs on about .018 clearance which means when assembled correctly you can put an .018 feeler blade between the clutch plate stack up. when the plates warp you lose that .018 clearance and now the plates are actually touching eachother and will cause the transmission to drag...orst case scenary would be the plates welding themselves together and then the transmission will lock into forward and at times stall the engine when puttin into revers because you are locking the transmission up
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eric lavine
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Posted: April-05-2012 at 8:27am |
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btw, slipping is not normal, that is the root cause of a dirty neutral
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"the things you own will start to own you"
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: April-05-2012 at 9:19am |
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Luka,
Eric is the best with the trans's. It's his business. He stated your problem very well. The bottom line is you need a rebuild. |
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dyn
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Posted: April-05-2012 at 5:20pm |
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So, which oil for my links are the best choice?
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8122pbrainard
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Posted: April-06-2012 at 8:48am |
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SNobsessed
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Posted: April-06-2012 at 12:04pm |
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If you change from oil to ATF, drain & refill at least 3 times to flush it. (Run it some each time, of course) It is best to manually drain the cooler & lines by unhooking them.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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dyn
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Posted: April-08-2012 at 3:42pm |
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dex II or dex III?
It is possible that with the change of oil will reduce the slipping? |
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8122pbrainard
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Posted: April-08-2012 at 3:58pm |
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I highly doubt it. The clutch plates are already warped. |
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GlassSeeker
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Posted: April-08-2012 at 9:37pm |
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can this dirty nuetral happen from a badly adjusted/out of adjustment shifter cable? not going all the way into nuetral? I'm just wondering.
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8122pbrainard
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Posted: April-08-2012 at 9:54pm |
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Andy, Not really. You need to understand how the marine trans really works. The shift lever is attached to a valve body that routes oil and it's pressure to activate the clutch packs. It's not like a manual trans where the foot clutch is mechanically moving a clutch plate. |
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dyn wrote: