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PCM 40A transmission issue |
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KENO 
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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 Topic: PCM 40A transmission issuePosted: October-16-2021 at 5:38pm |
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lancef51
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Joined: October-15-2021 Location: Minnesota Status: Offline Points: 3 |
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Posted: October-16-2021 at 1:40pm |
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Thanks. I tried calling FFI, but they just told me they don't work on the 40 series and referred me to a distributor that will sell me a new transmission for $3000. I'll try again Monday and see if I can get Joe on the phone. Seems like the problem has to either be the valve or the forward piston seal. I wish I knew how the valve is supposed to work WRT lowering pressure in neutral.
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: October-16-2021 at 1:21pm |
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Being an 08 you most likely have the control valve that reduces pressure in neutral.
It sound to me like you have leakage on the forward clutch side of things, like maybe the seal rings on the forward clutch pistonwhich would lead to low fwd pressure and slippage just like you have. I'd call Joe at FFI Marine and talk to him, he gives free advice, rebuilds them, has some hard to find parts and would offer to rebuild it for you too or sell you the parts  Phone number is 330 273 8291
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lancef51
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Joined: October-15-2021 Location: Minnesota Status: Offline Points: 3 |
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Posted: October-16-2021 at 12:57am |
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I have a 2008 Ski Natique with a 5.7L engine and PCM 1:1.23 angle transmission. The transmission has started slipping in forward. I checked the main pressure port and found that the pressure is abnormally low in forward but quite normal in reverse. The pressure is even lower in neutral. In neutral the main pressure is 20PSI at 650RPM, 160 at 1500RPM, and 190 at 2500.. In reverse I get 178PSI at 650RPM, 201 @ 1500, and 225 at 2500. In forward I get 53 at 650RPM and 55 at 1500 (any higher and the clutch slips). According to the transmission maintenance manual it's likely I have a control valve that reduces the main pressure in neutral and I'm wondering how that's supposed to work and whether there's something I can fix without tearing the transmission apart. Any help with this would be greatly appreciated including ideas on what else would cause reduced pressure in forward when the pressure in reverse is normal. Apparently some parts like clutch disks are no longer available but given that this transmission only has 900 hours on it with nearly half of that at idle in neutral makes me think the disks are probably OK.
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