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Old 12-31-2011, 01:25 PM   #1
Crzesk8dad
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Default Clutch repaired and replaced, now still have a knocking noise

1999 SL SOHC 255K+ miles, manual transmission.

Had the clutch, throwout bearing replaced, also replaced flywheel with another resurfaced one.

Shifts great, power good, but I have a "knocking" or rubbing noise, that sounds like a rod about to be thrown. The noise gets faster, slower depending on RPMs, noisier on low RPMs, quieter on high RPMs. Noise totally goes away when in neutral or clutch pressed down, so I'm thinking it's not engine related, but transmission?

Thanks for your help on earlier clutch inquiry.

Happy New Year!

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Old 12-31-2011, 02:38 PM   #2
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Default Re: Clutch repaired and replaced, now still have a knocking noise

I assume it didn't do that before the new clutch? If it gets faster with the engine, but not in neutral then it seems like something didn't go back together correctly with the transmission. I would check the tranny fluid. It could also be that the clutch hydraulics have not adjusted to the new clutch yet.

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Old 12-31-2011, 05:42 PM   #3
Crzesk8dad
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Default Re: Clutch repaired and replaced, now still have a knocking noise

Quote:
Originally Posted by ShawnV View Post
I assume it didn't do that before the new clutch? If it gets faster with the engine, but not in neutral then it seems like something didn't go back together correctly with the transmission. I would check the tranny fluid. It could also be that the clutch hydraulics have not adjusted to the new clutch yet.
Actually, it made the noise prior to the new clutch. Although due for a new clutch (original clutch at 255K), I thought the noise may be coming from the throw out bearing and/or flywheel.

All of that replaced, yet still have the noise, and it's getting noisier.

I will check the tranny fluid (gear oil), you may be on to something. Thanks.

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Old 12-31-2011, 06:08 PM   #4
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Default Re: Clutch repaired and replaced, now still have a knocking noise

diff pin?

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Old 12-31-2011, 06:37 PM   #5
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Default Re: Clutch repaired and replaced, now still have a knocking noise

^^^ We have a winner, methinks

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Old 12-31-2011, 07:46 PM   #6
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Default Re: Clutch repaired and replaced, now still have a knocking noise

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Originally Posted by Crzesk8dad View Post
I will check the tranny fluid (gear oil), you may be on to something. Thanks.
completely missed this earlier. these manual transmissions are designed to use ATF, gear oil is probably far too heavy for proper operation and may damage the gearbox (someone correct me if i'm wrong). was it making noise before you put the gear oil in?

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Old 01-01-2012, 05:10 PM   #7
LabRat
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Default Re: Clutch repaired and replaced, now still have a knocking noise

Quote:
Originally Posted by Crzesk8dad View Post
1999 SL SOHC 255K+ miles, manual transmission.

Had the clutch, throwout bearing replaced, also replaced flywheel with another resurfaced one.

Shifts great, power good, but I have a "knocking" or rubbing noise, that sounds like a rod about to be thrown. The noise gets faster, slower depending on RPMs, noisier on low RPMs, quieter on high RPMs. Noise totally goes away when in neutral or clutch pressed down, so I'm thinking it's not engine related, but transmission?

Thanks for your help on earlier clutch inquiry.

Happy New Year!
If the knock occurs as above when the car is in motion, clutch, output or input sides of the transmission could be suspect, including the diff pin. If it only occurs when the the car is not in motion then input side is suspect which would rule out the diff pin. If it's diff pin (or output side) the straight-line knock frequency would only depend on vehicle speed and should be independent of gear chosen and engine rpms.

My guess would be something on input side since it appears rpm related, like say main input shaft bearing? Haven't had one of these transmissions apart and am unfamiliar with FWD manual transmission layouts.

Other possibilities include a loose flywheel (if it was improperly reinstalled for instance) or improperly installed clutch parts etc. Engine is included on "input side", another knock source could have randomly surfaced at this time, although the lack of knock when clutched or in neutral points away from it, stranger things have happened.

Just my $.02 again.
-LR

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Old 01-02-2012, 12:05 PM   #8
Crzesk8dad
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Default Re: Clutch repaired and replaced, now still have a knocking noise

Thanks to all for the ideas. After reading, I did more research on the internet, and the diff pin certainly sounds like a good place to start, if nothing else.

If that is the case, am I better off finding a used or rebuilt manual trans and replacing it?

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Old 01-02-2012, 09:12 PM   #9
Crzesk8dad
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Default Re: Clutch repaired and replaced, now still have a knocking noise

And one added question:

Do I risk damaging anything else if I let it go, and wait until the transmission and/or diff pin fails?

I carry AAA Premier, so I know I can be towed home or to a garage.

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Old 01-04-2012, 03:17 AM   #10
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Default Re: Clutch repaired and replaced, now still have a knocking noise

It will not be "good" for the engine if it stops suddenly due to catastrophic transmission or differential failure but may not do major, serious damage unless engine is revving high and/or under heavy load. Only you can decide how much damage risk might be acceptable.

If the knock is due to loose flywheel, failure likely will damage engine. Should be fairly easy to check by pulling the flywheel inspection cover to see if the flywheel is wobbly by hand, or moves when the clutch is operated.

-LR

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