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Old 06-06-2011, 11:11 AM
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Testing Transmission Mount

Do you think this transmission mount rubber has become too flexible?





http://s157.photobucket.com/albums/t...yMountTest.mp4

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Old 06-06-2011, 03:49 PM
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Looks a little spongy, may be starting to break down.
They don't cost much, may as well replace it while you're there.
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Old 06-06-2011, 03:54 PM
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Quote:
Originally Posted by SSedan64
Looks a little spongy, may be starting to break down.
They don't cost much, may as well replace it while you're there.
X2 go ahead and replace it might as well like sedan said pretty cheap.



Cole
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Old 06-06-2011, 03:57 PM
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Yes, I am going to put in a new one. And I thought it a little soft too, but as I never checked a new one, I thought I'd ask. (and curiosity and impatience as once I get a new one, I can compare them).

There were two issues with this mount.

First, when I had the engine out, I left the bellhousing supported by a hydraulic jack and it bled down leaving the transmission at a sharp angle, held only by this mount. (Silly me)

Second, I had a valve cover oil leak and some oil did get down under the car and get blown back along the underside. This mount was well covered in oil, so the rubber may have become quite soft. (Incompetent me installing a valve cover and having a leak).
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Old 06-07-2011, 04:59 PM
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Have a new one and compared them.

At first wiggle, I thought the new one was almost as soft as the old one, but I found that after a small bit of intial movement, the new one became quite firm while the old one continued to flex more easily.

It wasn't the fairest of comprisons, as the Dealer informed me the part had been discontinued, but I managed to buy an aftermarket one at an autoparts store. Hey, only $9 !!!

So although the new one is stiffer, I'm not sure if it will help with vibrations or not. Time will tell once I get the car back on the road.
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Old 06-07-2011, 05:11 PM
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Are you have some vibrations ?




Cole
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Old 06-07-2011, 05:25 PM
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Yes, I've been chasing a clutch chatter problem for a long time. Had the clutch apart and couldn't find a thing wrong with PP, clutch disc or flywheel. All parts looked like new and only have 5500 miles on them.

Clutch will not slip by the way.

I don't feel any pulsing in the cluth pedal either, but did a test. I locked the e-brake and did a test by riding the clutch a little bit.

Lots of car vibrations in 1st gear.

None in reverse.

Next to nothing in 3rd gear.

I know the engine mounts are solid. Like rocks. So I thought I'd check the tranny mount.

I'm just checking everything I can, and if I can't find anything external, then I"m taking the clutch back out, although I"m not sure what to do other than throw all new parts in it.

I did a little sketch of my test to show how the torque works against each other in reverse and cancels out a bit, but engine mount and tranny mount add in first.

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Old 06-07-2011, 05:48 PM
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Has it been doing it since the new clutch or before ?
And was the flywheel re-surfaced before the clutch install ?


Cole
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Old 06-07-2011, 05:57 PM
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No, there isn't a new clutch. It's all the original parts I bought as it's a kit car I built. I'd say the problem started roughly at about 4000 miles, and has been getting worse lately. Currently 5500 miles on flywheel, PP and clutch disc. All McLeod parts.

Last time I had it apart, I did take some scotchbrite and Brake CLean to the PP and flywheel, but as I said, everything looked new. Not a mark, not a crack, no discolouring. The clutch disc had become a little brownish and it was originally grayish, but Mcleod Tech Support tells me that is normal. No indications of oil on it either.

So I'm checking everything else first. If I cna't find anything else, I'll be removing the clutch again, and this time make a bunch of measurements and try to fix it buying new stuff all over again (which I detest doing... don't mind spending the money, but not needlessly).
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Old 06-07-2011, 06:04 PM
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Quote:
Originally Posted by Argess

So I'm checking everything else first. If I cna't find anything else, I'll be removing the clutch again, and this time make a bunch of measurements and try to fix it buying new stuff all over again (which I detest doing... don't mind spending the money, but not needlessly).
I can understand that trust me i have been there also.
I just wonder if it's not something like the fingers in the PP or a spring in the clutch disc or even the throwout bearing giving just enough trouble to cause this.



Cole
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Old 06-07-2011, 06:16 PM
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I didn't do much more than a visual inspection last time. If it comes to removing the clutch again, I will check individual finger pressure (only 3 of them), bellhousing alignment as well.

I did do a lot of Googling on the subject and found that most people that experience clutch chatter have the problem both in 1st AND reverse and many also have clutch slippage issues as well.

Mine is smooth as silk engaging reverse.

In my little test (as described above) the clutch disc does not turn as the e-brake is on. Only in first does the car shake, hence I decided to look at the mounts. I don't have high hopes of this new tranny mount fixing the problem, but one never knows till one tries it.
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