Damper Plate Failure
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=30982
Printed Date: November-25-2024 at 5:50am
Topic: Damper Plate Failure
Posted By: Sunshinecustoms
Subject: Damper Plate Failure
Date Posted: July-29-2013 at 8:57pm
Just wanted to share. Last two weekends on the lake our 1986 Ski Nautique 351 had a rattle noise that sounded like it was coming from the transmission. During a hard pull it shifted in to what seemed to be neutral and wouldn't move. Had to be towed in. I pulled it apart today and found the damper plate had come apart. Luckily nothing else was damaged. Thought I'd share some photos.  
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Replies:
Posted By: ny_nautique
Date Posted: July-29-2013 at 10:07pm
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Deja vu... wasn't there a thread here about this just a few weeks ago? Just goes to show that the damper plate is a maintenance item. Welcome to the forums David. Lets see some pics and details about your boat. ------------- - Jeff 1999 Ski Nautique |
Posted By: Sunshinecustoms
Date Posted: July-30-2013 at 12:19am
Love my 86 Ski Nautique. Had it for about 10 years. 
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Posted By: Nauti87
Date Posted: July-30-2013 at 9:12am
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And I thought the one I pulled out of my '87 was bad! You win. ------------- 1987 SN 2001 Barn Find aka "Nauti" (sold sadly) 1988 MC Anniversary Prostar 190 |
Posted By: jblocal
Date Posted: July-31-2013 at 10:46pm
http://s834.photobucket.com/user/jblocal86/media/image.jpg.html" rel="nofollow"> So I guess everything happens in 3s. I was running out to do some fishing and felt like my transmission dropped out 5 miles offshore. This damper is only 1 1/2 old has about 300h on it. What could have caused this to fail? There are some cracks and 1 spring completely broke thru. |
Posted By: Morfoot
Date Posted: July-31-2013 at 11:35pm
http://correctcraftfan.com/forum/forum_posts.asp?TID=30629&title=77-tique-clunk-sound" rel="nofollow - Damper Plate!
Metal fatigue caused it to fail. The corrosion built up on yours probably had a hand in it's demise too... constant torque loads from the engine to the tranny thru the damper plate is gonna stress out the springs/metal eventually. When it goes....it goes.... Here's mine....  ------------- "Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman" |
ny_nautique wrote:Posted By: boardersdad
Date Posted: August-02-2013 at 4:09am
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Where'd you guys learn how to replace this plate? I'd be afraid to pull the trans apart. Should the plate be replaced occasionally... and how often? Thanks. |
Posted By: dwouncmd
Date Posted: August-02-2013 at 9:00am
The plate is actually not within the transmission but part of the interface between the motor and transmission so the transmission itself does not have to come apart, but the transmission does have to be separated from the motor. As the names implies it "dampens" the torque delivered from the engine to the transmission so there is a little give when you put the boat in gear or firewall the throttle. The damper plate is bolted to the flywheel. Into this clutch-like plate slides the splined input shaft, so the damper plate acts as coupler between the engine and the transmission and all torque is transmitted through it. There is a list of steps http://www.correctcraftfan.com/forum/forum_posts.asp?TID=27669&title=remove-transmission-and-replace-damper" rel="nofollow - here that was helpful to me getting mine out. I don't think the damper plate needs to be replaced unless it fails or begins to rattle, possibly indicating loose or missing springs or bolts. If the transmission is pulled for some other reason, inspect the plate for cracks and for broken or missing springs, if it looks OK you can leave it, or just go ahead and replace it if you want to spend the money to do it now instead of later, but that could be a lot later because the plates can last a long time. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=6535&sort=&pagenum=2" rel="nofollow - 89 SN <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=6567&sort=&pagenum=1" rel="nofollow">7 |
Posted By: SNobsessed
Date Posted: August-02-2013 at 10:09am
I think this is false economy - the part is not expensive & has a finite life. I changed mine at 800 hours just cause it had 800 hours on it. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: Morfoot
Date Posted: August-02-2013 at 10:16am
I gotta agree with Chris on this one. Mine had about 800 hrs on it when she blew apart. It all depends on how you drive the boat. Allot of slamming the throttle and transitioning from forward to reverse without pausing first will wear out a damper faster. Planes are retired from service after so many cycles because of metal fatigue from pressurizing them over and over again. They do have a limited lifespan. ------------- "Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman" |
Posted By: dwouncmd
Date Posted: August-02-2013 at 1:17pm
To me 800 boat hours is a long time  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=6535&sort=&pagenum=2" rel="nofollow - 89 SN <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=6567&sort=&pagenum=1" rel="nofollow">7 |
Posted By: SNobsessed
Date Posted: August-02-2013 at 1:24pm
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10-4 ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: jblocal
Date Posted: August-03-2013 at 2:34pm
| I installed that Sachs plate which seems like a way better plate then the one from ski dim. Transmission shifts into gear like butter now. I also had a dirty neutral before that is now fixed since I replaced dampner. |
Posted By: 8122pbrainard
Date Posted: August-03-2013 at 3:37pm
It's been mentioned several times that the Sachs is the best plate and I agree. They use a square bottom seat (top and bottom) for the springs. From a mechanical standpoint, it doesn't put extra stress on the first coil of the springs like the cheap stamped spring pockets do. For springs to work properly, they need to have ground ends and sit on flat basses top and bottom. The only problem is Sachs doesn't make a plate for the PCM trans!!  BTW Skidim does NOT have good pricing on their plates.------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 74Wind
Date Posted: August-04-2013 at 12:25am
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Question: Is this the same Sachs that produced motorcycles/engines in the 70's? I had a Sachs 100 6-speed wrong-side-kick in my youth that just plain flew, indestructable bike that would blow the Elsinores & YZ's right off the trail........ ------------- 1974 Southwind 18 1975 Century Mark II |
Posted By: emccallum
Date Posted: August-05-2013 at 11:05pm
Suspense is killing me...who sells them cheaper? |
Posted By: Dreaming
Date Posted: August-06-2013 at 12:34am
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Ebasic power has been mentioned as a cheaper choice...
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Posted By: Sunshinecustoms
Date Posted: August-06-2013 at 12:34am
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Just got the new plate from Sachs. Looks great. Installed the plate and re-installed the transmission this evening. Can't wait for a test run this weekend. I included an awesome link. http://www.planetnautique.com/CorrectCraftManuals/PCMEngineOwnersManual.pdf |
Posted By: emccallum
Date Posted: August-06-2013 at 10:31pm
Hope the test goes well! Where did you get the Sachs damper plate? Any chance you have a part number? Thanks. ernest |
Posted By: Sunshinecustoms
Date Posted: August-07-2013 at 7:01pm
| I found it on ebay. This is the parts number on the listing 1004-650-006. New in Sachs box, just over 100 dollars. |
Posted By: emccallum
Date Posted: August-08-2013 at 8:58am
| Thanks! |