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  #11  
Old 05-28-2015, 10:59 PM
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mtajpa mtajpa is offline
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Boat: MC 1999 Maristar 230 sport
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It seems he went through the complete transmission to find that it was his dampner plate. If your noise goes away just above idle when in gear I wouldn't worry to much about it. It seems like everyone with the ZF hurth 63 has the same complaint in fact there is a bulletin out about this exact issue. The bulletin says to use the 10w40 engine oil to quite the noise. I still transfluid in mine. I do run mine hard skiing at 34mph, surfing, and getting to my favorite spot which is usually 45 minutes by boat at 30plus mph.

I'm not saying there is a problem or not if your are uncomfortable with the noise its your call how far to go investigating. I will be looking into a new dampner plate net year just because I will be over the 700 hour mark. Thats just my plan. I know how it sounds and always listening for something different.

Good luck
mtajpa
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File Type: pdf SV2001-2 Hurth Trans Noise.pdf (25.2 KB, 161 views)
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  #12  
Old 05-28-2015, 11:12 PM
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wetwillyskate wetwillyskate is offline
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Join Date: Jul 2014
Boat: Mastercraft Maristar 200 VRS
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I read that pdf and had high hopes for swapping the fluid, which didn't make a difference.

I have the "HSW 450 D" trans. Any idea how this differs from the 630?


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  #13  
Old 05-28-2015, 11:27 PM
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mtajpa mtajpa is offline
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I am not sure what the difference is between the two. I have the 230 Maristar larger boat larger trans maybe. Somewhere on here is a model guide with the ratings.
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  #14  
Old 05-30-2015, 03:57 PM
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wetwillyskate wetwillyskate is offline
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Found the rock in my trans...Name:  ImageUploadedByTapatalk1433011953.097658.jpg
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The fly wheel itself was loose. Likely after the one bolt failed. Maybe they were all never fully torqued.
I'm going to replace the dampener plate too because it's a rust bucket and all of the springs are loose.
Name:  ImageUploadedByTapatalk1433012247.602752.jpg
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Hopefully this is my smoking gun.


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  #15  
Old 05-30-2015, 05:43 PM
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milehigh970 milehigh970 is offline
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Nice catch!! That could of turned real bad!!
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  #16  
Old 05-30-2015, 09:47 PM
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mtajpa mtajpa is offline
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Your "ROCKS" must have been louder than mine. Ditto on the find. You will sleep better I'm sure.
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  #17  
Old 06-29-2015, 07:05 PM
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toocoolgun toocoolgun is offline
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Boat: MasterCraft, ProStar 190, 1991, 351
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Just pulled my tranny because of noise. everything feels fine when rotating by hand. Hopefully it just the damper plate. Does anyone know what I need to torque the damper plate bolts to?
Thanks in advance for replies.
Troy
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  #18  
Old 07-08-2015, 11:41 AM
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wetwillyskate wetwillyskate is offline
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IIRC these were 7/16 bolts and i used blue loctite and torqued to 52 ft-lbs with new grade 8 bolts according to a general torque spec i use at work for 75% preload. also: https://www.boltdepot.com/fastener-i...ed-Torque.aspx

The flywheel bolts were spec'd to 74 lb ft and i used ARP bolts there with ARP assembly lube. NO chance this is happening again to me again.
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