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  #1  
Old 04-10-2016, 12:04 PM
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The Mystery Knock....

Boat is a 1990 190 with 351w and a Borg Warner Velvet Drive...

I had a issue late last year with the shaft turning in neutral.. I was under the impression it was the Damper Plate which I went ahead and replaced... The flywheel looked good and even the old damper plate looked good with no springs or rivets ect missing... After replacing the damper plate the knock was there and the shaft still turned... I was then under the impression then ot was the clutch pack.. I never rebuilt this trans so after 26 years of having this boat I got the parts, new seals ect and I did it yesterday...

Ok after spending the whole day yesterday doing this the good news is is the transmission works great.... The engine runs smooth... It shifts fine... hOWEVER....there is still a intermittent knock sounding like its from the bell housing when in gear.... Both reverse and forward... This is not happening when in neutral and the engine sounds fantastic from high rev to idle.. It only knocks in gear... It's a off on knock too.. Not repetetive..... I am totally lost here and would love to here any tips or feedback from anyone on here.... Also reading this thread from 2012 could it be gear lash??? I guess ot would be worth finding out.., and the knock does kind of sound like a cutting out knock... Not a rattle... http://www.mastercraft.com/teamtalk/...p/t-42372.html

Last edited by TLR67; 04-10-2016 at 12:53 PM.
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  #2  
Old 04-10-2016, 01:15 PM
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the shaft will turn neutral due a pressure on a bearing in the trans - normal. The new knock you are hearing obviously needs to be located.. it's possible the damper plate has an issue.. but this is hard to diagnose... do you have a mechanics stethoscope to locate exact area of knock?

did you put in the correct damper plate? Do you have a pic of old damper plate and the one you replaced with? and the part number?

Can you post a video?
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  #3  
Old 04-10-2016, 03:39 PM
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Have you aligned the engine and shaft? Agreed with Mike that some prop turning in neutral is normal.
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  #4  
Old 04-10-2016, 08:33 PM
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I went from the stock one that looked like a chopped off square to the one on the left in post 26 here... http://www.mastercraft.com/teamtalk/...r+plate&page=3

I really don't think it's the plate.. It shifts fine and all springs ect were fine after minimum use... With my old one that looked fine it was doing the same thing... I am going to put on a new cap and rotor and check the timing...
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  #5  
Old 04-22-2016, 11:37 AM
Blackhawk36 Blackhawk36 is offline
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Did you find out what the problem was. I have the same issue. I am looking at the prop shaft strut.
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  #6  
Old 04-23-2016, 01:59 AM
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I had the same issue last season. My X2 also has the Borg Warner Velvet Drive and I suspected all the same things you listed. Fortunately, I have a kick ace neighbor that was a marine mechanic for many years who helps me diagnose my boat issues. I never would have though to check spark plugs because of that knock near the bell housing but it was the problem. I had 2 plugs out and after replacing all 8 it ran smooth with no knocking. Good luck and I hope you get as lucky as I did.
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Old 04-23-2016, 06:14 AM
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I put new plugs in a few Months back at the end of the season...I just put a new cap and rotor on last night.... Taking it out here in a few hours... Fingers crossed.. Old rotor looked good but the cap looked a little burnt up on some leads.. Spent all day yesterday compounding and waxing.... Boat looks like it did 26 years ago...
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Old 04-23-2016, 08:19 AM
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Hmmmmmmmm
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  #9  
Old 04-26-2016, 08:30 AM
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Quote:
Originally Posted by 03 35th Anniversary View Post
Hmmmmmmmm

Naaa...... Its fine in Neutral...... Even reved up.... Put in the cap and rotor and the damned thing is definitely off time or has a bad plug wire.. Even had a backfire in the carb...... Changing the wires today at Lunch... these were 10 + years old anyhow...If that's not it I need to get a light and do the timing....
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  #10  
Old 04-26-2016, 09:54 AM
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Sounds like you have it all covered, only thing I can think of is the transmission pump??? Maybe starving for fluid? Is it full? Maybe it's shot?

I honestly don't know, but it's just a thought. Everything you're describing really sounds like the damper plate....
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