Tranny making grinding noise.

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   1992 GT40?

A low rpm idle will commonly make the marbles in a jar noise. I think you need to tighten the shaft nut irregardlessly. 

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Hollywood Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13515	Post Options Post Reply Quote Hollywood Report Post Thanks(0) Quote Reply Topic: Tranny making grinding noise. Posted: July-08-2013 at 12:45pm
	1992 GT40? A low rpm idle will commonly make the marbles in a jar noise. I think you need to tighten the shaft nut irregardlessly.

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21186	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Posted: July-08-2013 at 12:28pm
	Ive heard strut bushings groan/growl when run on land unlubricated... but "marbles in a tin can" would make me nervous... even if the noise doesnt show up on the water, I'd get a new damper to have on hand, at a minimum.

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-06-2013 at 4:45pm
	I think your right. We got it in the water yesterday and you couldn't notice anything. I had never put mine in gear out of water so I didn't know they sounded like that. "A bunch of marbles in a tin can" sounds pretty accurate. Chris
	1999 Ski Nautique 196

lewy2001 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234	Post Options Post Reply Quote lewy2001 Report Post Thanks(0) Quote Reply Posted: July-05-2013 at 8:24pm
	Before you go any further put it in the water and test if noise is still there. Without any load on the prop this noise is quite common. Sometimes if your boat has a low idle you can get the same type of noise. Eric our resident trans specialist described it as a bunch of marbles in a tin can. It may need a new damper plate if the noise is still there when you water test.
	If you're going through hell, keep going 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-05-2013 at 10:52am
	From the prop end
	1999 Ski Nautique 196

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-05-2013 at 10:46am
	Thanks Chris. I'll check those today. I took some video you guys could hear it.
	1999 Ski Nautique 196

SNobsessed Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102	Post Options Post Reply Quote SNobsessed Report Post Thanks(0) Quote Reply Posted: July-05-2013 at 7:53am
	Inspect the trans/shaft coupling closely. Maybe the shaft coupling is working loose. Also could be damper plate going out. Get a big screwdriver, hold it against the bell hsg & your ear to diagnose. same for tranny.
	“Beer is proof that God loves us and wants us to be happy.” Ben Franklin

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-04-2013 at 11:41pm
	I should have also mentioned I can hear a similar but different pitch to the noise while observing the prop spinning (with water on the cutlas).
	1999 Ski Nautique 196

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-04-2013 at 11:39pm
	So the noise sounds like its coming from the transmission. To describe it, it sounds like the teeth of a gear that aren't finding center. It slows with power reduction and quickens with more power. There is slop in the props connection with the shaft. I can rock the prop back and forth and j can hear it ticking against the key. I don't think that's where the noise is originating but would it be possible for vibration/noise to get transferred to the tranny from the prop? When I rotate the shaft I can feel a tiny bit of play between it and the tranny. I can't tell where it's coming from (engine connection, internal, or shaft). It will be out at the lake tomorrow to check further....... Any ideas come to mind?
	1999 Ski Nautique 196

PLBC Members Profile Send Private Message Find Members Posts Add to Buddy List Gold Member Joined: January-25-2006 Location: United States Status: Offline Points: 568	Post Options Post Reply Quote PLBC Report Post Thanks(0) Quote Reply Posted: July-04-2013 at 10:48am
	Putting it in gear out of the water, that would be my guess for his 'problem'.
	99

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-04-2013 at 12:39am
	That was my first thought. I don't recall reading any threads here about grinding noise coming from the transmission.
	1999 Ski Nautique 196

Gary S Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096	Post Options Post Reply Quote Gary S Report Post Thanks(0) Quote Reply Posted: July-04-2013 at 12:19am
	Hopefully it could be something simple as not lubricating the cutlass bearing Chris.
	69 Mustang HM SS 95 Nautique Super Sport

Frankenotter Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: August-26-2012 Location: Milwaukee Status: Offline Points: 1072	Post Options Post Reply Quote Frankenotter Report Post Thanks(0) Quote Reply Posted: July-03-2013 at 11:44pm
	First off......this isn't for my boat. It's a friend that has a 92 with the GT 40 and a 1:23 tranny. He just started it today and put it in gear on the fake lake. He said it made a "gear grinding noise". Any ideas what this could be? I'm going to his house tomorrow to try to help him determine if its normal. All I have to compare it to is the sound of mine. Whatever you guys can come up with to help find if there is a problem would be much appreciated. Chris.
	1999 Ski Nautique 196

Tranny making grinding noise.

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