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GT-40 Dampner plate diagnosis and replacement |
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wetskier2000 
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Joined: September-07-2005 Location: New Hampshire Status: Offline Points: 375 |
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 Topic: GT-40 Dampner plate diagnosis and replacementPosted: March-08-2025 at 1:19pm |
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1997 GT-40, 1870 hours. I get a rattle, rattle, rattle at idle in gear that I believe is the dampner plate. Any thoughts on if that's correct? Hints on R&R and where to purchase one?
thanks, Rick |
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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wetskier2000
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Joined: September-07-2005 Location: New Hampshire Status: Offline Points: 375 |
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Posted: March-08-2025 at 1:22pm |
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Might help if I called it by the correct name. I see that it's DAMPER not DAMPNER.
Nautique parts says: Damper plate for engines with PCM transmissions Used on Ford 302 & 351 and GM 5.0L, 5.7L, & 6.0L engines with PCM transmissions (Power Plus 1.23:1 & PCM 1:1) This is a new heavier duty plate replacing the original part # R140016./ R140016A all now replaced by R140020 |
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11197 |
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Posted: March-08-2025 at 7:34pm |
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Sounds like a reasonable thought.
Someone might say to crank up the idle speed but that's easier said than done on a gt40. Does the noise go away right after you put it in gear and give it a little gas? The plate you mention is the right part number for a Ford with a PCM40A transmission. You can't find a cheaper aftermarket replacement like you can for a Ford with a Borg Warner transmission The PCM 40A transmission input shaft has 15 splines and the Borg Warner has 26 splines so the damper plates are different. Here's a link to an old thread with a writeup on removing a Borg Warner from an 88 SN. Your steps will be pretty much the same but you'll be lifting a transmission that's 35 or so pounds lighter than the Borg Warner. Places to buy.....NP gives a better discount than SkiDim  ..........Most other places are more expensive for this damper |
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wetskier2000
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Joined: September-07-2005 Location: New Hampshire Status: Offline Points: 375 |
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Posted: March-09-2025 at 12:26pm |
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Verified the model of the trans. The plate on top clearly says PCM 40A.
If I increase the throttle just a bit, the noise does go away. Even if I could raise the idle, I'd still be stuck with going more than no wake which is an issue in SWFL canals. Is there some discount code I could be using at Nautique Parts? Should I be thinking about replacing the trans oil cooler too at it's advanced age? (although I am not keen on opening the trans oil system at all). If it ain't broken.... |
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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KENO
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Posted: March-09-2025 at 4:52pm |
Quit thinking like that right now........ if you keep having thoughts like that you'll end up wondering if you should replace the whole transmission with an updated PCM 80A or someone will convince you that yours is about to die of old age. Then you'll end up spending 4000 plus on the kit. Like you said.......if it ain't broke.......but since water in the transmission is a PCM40A killer, a cooler wouldn't be a bad idea. It's an easy job Of course, whatever you decide will inevitably turn out to be the wrong choice a year or so down the road The NP discount code must be a closely guarded secret........it's PND and you get 10% off. Don't ask what PND stands for, just use it.
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wetskier2000
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Joined: September-07-2005 Location: New Hampshire Status: Offline Points: 375 |
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Posted: March-10-2025 at 9:29am |
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... At no place on this planet will I ask....
 Do the trans coolers have any history of failure? My boat sees slightly brackish water for about 3 weeks per year but is run in fresh water right after that then re-winterized.
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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Fl Inboards
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Joined: January-20-2008 Location: United States Status: Offline Points: 2143 |
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Posted: March-10-2025 at 9:41am |
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Heck i did not even know there was a PND discount...and i work there!! LOL!! I have a ford series 40 damper plate new old stock listed on FB market place. Dont remember what i listed it for and have not had any response. but $100 and shipping it can be someone else's!
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Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.
1993 Shamrock "fat" 20. 2008 Nautique 196 5.0 |
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wetskier2000
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Posted: March-10-2025 at 9:54am |
Oh hell, I ordered the damper last night at considerably more than 100 bucks.... sorry...
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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wetskier2000
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Posted: Yesterday at 9:08am |
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Thanks for all the help guys! I'll report back once the actual work begins. obligatory pic....Those with a keen eye will notice what I was working on....
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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TRBenj
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Posted: Yesterday at 10:30am |
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Is that a pseudo masters scheme (neutral, zephyr) with the light blue main stripe? Or is that photo tricking my eyes?
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wetskier2000
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Posted: Yesterday at 12:36pm |
I guess it is. I had to go look for a Master's since I only recalled the green color. But yeah, we picked the light tan (Neutral?) and darker tan (zephyr?) and the light blue. But it was 28 years ago, I didn't remember the color names.
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Current: 1997 Nautique
Previous: 1987 Nautique 1964 American Skier |
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wetskier2000 wrote: