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Need clutch disc, not kit


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Hi

I had a McLeod clutch kit installed about 5-years ago but only put maybe 2-3K miles on the car and it is shot. That was using my 5-speed transmission which I just switched out to a 4-speed last year. Hopefully, whatever caused the issue with the clutch will be corrected now. From the looks of the wear, it seems that the disc was cupped slightly.

McLeod only sells replacement discs for some of their American car products. Is there any reason why I couldn't just replace the disc with one from another manufacture? If so, any suggestions?

Thanks

Jeff

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A picture would be neat.  You're saying that Mcleod's products are of low quality.  Which do you have, it looks like there are two types of disc.

https://www.mcleodracing.com/sport-compact/c28

Any aftermarket disc should work.  Pick your favorite brand.  

https://www.rockauto.com/en/catalog/nissan,1976,280z,2.8l+l6,1209226,transmission-manual,clutch+friction+disc,10605

 

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Posted (edited)

This was McLeod part no. 763701. The TSR at McLeod said it was an installer issue. : \

In the pics you can see the outer edge is glazed on one side and the inner edge is glazed on the other side. Holding a straight edge across the pads shows that the disc is cupped. 

Rock Auto shows an m-pact that should fit. I had to contact M-Pact directly to get the product number because it didn't show up on a Rock Auto search by car type (99536ST2) 

HD Ceramic Hi-Torque 6 Puck Assembly, 8-7/8" X 1" X 24T

IMG_2444.JPG

IMG_2441.JPG

IMG_2442.JPG

Edited by Jeff Berk
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No, not beat up. Just some grease, grime, bad picture. I won't say I didn't install it backwards. I cannot recall which way I installed it.

This was the first time I installed a clutch so maybe I screwed up. I have a lot of firsts with this car. I'm getting really good at replacing transmissions (unfortunately).

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11 hours ago, Jeff Berk said:

maybe I screwed up. I have a lot of firsts with this car.

We all have done something wrong i think to our cars in time..  i think you installed it the wrong way (?) ...   The part does not look very used.. could be that if you sanded the pads a bit you could use it for many more miles as it did not make a very well contact to the rest of the clutch parts!

The cupping will go away once the clutch is installed in the right way.. i think/hope.. (Use also some degreasing stuff because a clutch HATES grease!!)

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Dutchzcarguy

Thanks for the frank input. It wasn't too expensive to order a new one so I'm going to replace it Maybe I can get it right this time if the problem was an installer error.

Jeff

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  • 1 month later...

The new disk is in and the car is working fine except for one annoyance.

With the clutch disengaged, there is a slight grinding sound in 1st and 2nd gear. The sound goes away as soon as I let the clutch out or when in neutral, 3rd and 4th gear.

Could the clutch slave not disengaging far enough? 

On a side note, anyone go to the vintage car race in Pittsburgh last weekend? There were not too many Z's racing but quite a few parked in the car show area.

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Posted (edited)
8 hours ago, Jeff Berk said:

Could the clutch slave not disengaging far enough? 

When you put the car in gear and you let go the clutch .. say a few cm, or as you guys say half an inch 🙂 .. does the car move? it shoud not.. It's normal that the car starts moving after about an inch lifting the clutchpedal.. when you have a new clutch, as this gets older it wil take more and more inches before the car moves or starts moving.. after 80kMiles there comes a time the clutch is that worn that it does not engage anymore.. some clutches work a lot longer it's just how you "work the clutch" in it's life time..

A slight wine of the clutch when disengaged in 1 gear (or second) is nothing to worry about i think..

Edited by dutchzcarguy
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15 hours ago, dutchzcarguy said:

A slight wine of the clutch when disengaged in 1 gear (or second) is nothing to worry about i think..

Could be the throw out bearing? My 280 does it when in neutral with no clutch engagement.

I pressed it on the collar myself. Next time I had my machinest press the bearing on my 240. It's as quite as a church mouse.

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If it only happens in 1st and 2nd but not 3rd or 4th then it seems likely to be a transmission issue.  The clutch operation is the same for all gears.  Any chance it's actually a vibration coming through the shift lever?  That's a common thing for 1st and 2nd.  Both on the left side of the pattern.

I wouldn't worry too much about it.  Keep track of it, if starts getting worse you can take action.

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The problem developed a little while after installing the new clutch disk so hopefully its not the transmission, not after spending $25 on it!

Ill keep an eye on it and see if if anything changes.

Thanks for the input.

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On 7/26/2022 at 7:03 PM, Jeff Berk said:

With the clutch disengaged, there is a slight grinding sound in 1st and 2nd gear. The sound goes away as soon as I let the clutch out or when in neutral, 3rd and 4th gear.

Maybe it's just semantics or wording, but what you have described really makes no sense. 

Let's start with a premise  -  "If the car is not moving, and the transmission is in a gear (any gear), then nothing inside the transmission is spinning."

With that in mind, when you are sitting still, there really isn't any difference in what's moving inside the transmission regardless of which gear you are in. Neutral is different, but all the gears (including reverse) should result in everything inside the tranny to be stationary.

Maybe the shift lever is buzzing on the worn bushings or against the tunnel somehow? Maybe the shift rods inside the tranny are buzzing vibrating when in first or second.

Unless I'm misunderstanding the issue (which is totally possible) then this cannot be a bearing issue inside the tranny case.

  • Agree 1
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That does sound a like a spinny noise.  Too bad you spread your threads around I'm pretty sure I saw one about the pilot bushing.

How did the pilot bushing fit?  Did you put a dab of grease on it?  The noise kind of sounds like what I would imagine a dry and/or loose pilot bushing to sound like.  It has a certain wobble to it.

But throwout bearing seems possible too.  You didn't record third and fourth so I assume that they don't make the noise.

Or, maybe the needle bearings around 1 and 2.  1 and 2 also share the same coupling sleeve.  The guys that have rebuilt theirs would know more about that possibility.

image.png

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I deviated from CO's point about nothing moving if the gears are engaged and the vehicle is not moving.  My post above doesn't really fit the "vehicle not moving" scenario.

 

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Posted (edited)

So, if the vehicle is stopped, transmission in gear, clutch is slightly engaged (but vehicle is still not moving), what happens?  The pressure plate, disc, and flywheel are pressed together, the main shaft and the gear that is engaged are loaded with force but still not moving. 

The only parts that are spinning are the flywheel, pressure plate, and throwout bearing.  The disc is still static, rotationally, because it is splined to the mainshaft which is engaged with whatever gear is selected, but the disc is still subjected to the spinning flywheel.  According to your description in the sound bite the noise happens when the disc is slightly loaded.

One part that might buzz is the spring(s) in the disc.  What did you buy?  Maybe it's some sort of weird resonance that only happens in 1st and 2nd.  Are you sure you can't make it happen in 3rd, 4th, or R?

Edit - also, the disc could be rattling on the main shaft as the pressure plate spins against it. That might give a spinny buzzy noise. Loose splines.

image.png

Edited by Zed Head
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p.s. it's not clear from your sound bite that the vehicle is completely stationary, like foot on the brake stopped.  Might be a clue.

Plus, it seemed like I heard some gear grind when you put it in gear.

Definitely an odd noise.  Everyone should listen to it.

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I’m going to have to try a few more scenarios but I don’t think this problem occurs in 3rd, 4th, or reverse (4-speed). It doesn’t matter if the vehicle is at a complete stop or is coasting. As you can tell from the recording, the sound doesn’t always occur. I haven’t tried pressing the brake while doing this.

There was a little grinding getting into 1st gear.

I installed a pilot bushing about 5 years ago.

The problem didn’t start until after installing the new clutch disk so maybe I need to contact M-Pact (https://www.rockauto.com/en/moreinfo.php?pk=6084348&pt=10605&jsn=4) and ask if this problem could be related to a resonance matching the springs.

The transmission has been in there maybe a year with no problem until the clutch disk failure, specifically, the cupping of the disk possibly due to improper installation. However, the car has not been driven much this past 1 ½ years due to bad luck with camshafts failing.

I’m somewhat limited in what I can do with the transmission right now. My ancient Hein-Werner floor jack that my transmission adapter is mounted on just failed and none of my other floor jacks fit the adapter.

One last thought… Did I install the clutch disk backwards? Please look at the attached photo.

 

NewClutch.JPG

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Posted (edited)

Usually they put a sticker on that says "flywheel side".  I don't see it on yours so it's probably right.  And the hub usually pokes in to the hole in the pressure plate which yours does.  Looks correct.

But, I think that problem might just be related to the fact that you're using one of those high performance clutches.  They're not made for comfort.  They're made for grabbing and going.  

Found some stuff -

https://www.google.com/search?rlz=1C1SQJL_enUS862US862&q=6+puck+clutch+disc+noise&sa=X&ved=2ahUKEwja17zGup_5AhUXIjQIHVdNDnAQ7xYoAHoECAEQMw&biw=1345&bih=620&dpr=1.19

Edited by Zed Head
Fond > Found
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