Pressure plate and other parts

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
AWOL43
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Pressure plate and other parts

Post by AWOL43 » Mon Dec 05, 2022 6:10 pm

As I am working on my ‘42 GPW project I removed the engine this week. It’s an early MB engine connected to a T-90 transmission. Now I found this to be the pressure plate. Just I have never seen any like this on a GPW/ MB. Does anyone know or have an idea what model it is exactly from or for?
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Last edited by AWOL43 on Tue Dec 06, 2022 9:15 am, edited 1 time in total.


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Junker-DK
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Re: Pressure plate

Post by Junker-DK » Tue Dec 06, 2022 2:24 am

Think it is from an M38 A1. I have the same clutch in my GPW. An excellent pressure plate.

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Re: Pressure plate

Post by AWOL43 » Tue Dec 06, 2022 4:33 am

Hi Junker-DK,

Thank you for solving that. So you say don’t change it, but use it in my GPW?
Do these fit or use the same 8,5” clutch disks as GPW/MB’s?

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Re: Pressure plate

Post by slatgrille » Tue Dec 06, 2022 6:46 am

Yes, it's a Rockford clutch. Available for the later CJ's. I believe it was a heavier duty plate. Uses 6 springs instead of the 3 found on the OEM Auburn pressure plates. Had one in my '42 MB. Worked great so I never changed it. It's also 'softer' on your leg (knee) while depressing the pedal.

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Re: Pressure plate

Post by AWOL43 » Tue Dec 06, 2022 9:10 am

Thank you both. I’ll keep it then. Since my technical knowledge is limited, but developing along the way, does it need to be overhauled or so to be used again?
I suppose the flywheel needs to be machined and worked on? And as mentioned does it also use the 8,5” clutch disk? As I will replace that with a new one while at it. Or better said, what does it all need to be placed back between the engine and transmission and work like new?

To give an idea, the ‘42 Script GPW has been stripped of all bubba parts, made it rolling with combat wheels and new tires, body removed and I just pulled the engine and transmission this week. I will now move on to removing all the brake lines, master cilinder and all. Remove the suspension and axles and then move on to work on the frame and axles and start the way back for the GPW.
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Last edited by AWOL43 on Tue Dec 06, 2022 2:08 pm, edited 1 time in total.

Adam
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Re: Pressure plate and other parts

Post by Adam » Tue Dec 06, 2022 10:50 am

If you are going to machine the flywheel, them replace the plate too, they both wear, crack and get burn marks on them. or send it out and get it reconditioned.

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Re: Pressure plate and other parts

Post by dpcd67 » Tue Dec 06, 2022 2:22 pm

I always have flywheels and pressure plates inspected and resurfaced. If you don't, you will regret it at some point. Glaze, cracks, craze and who knows what else.
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Re: Pressure plate and other parts

Post by Wolfman » Wed Dec 07, 2022 6:38 am

I agree with Adam & TJ.
Replacing a clutch disc is a package deal.
To take this a little farther, normal clutch wear causes high and low rings in the contact surfaces of the disc, pressure plate and flywheel friction surfaces, even though this may be only slight.
If you decide the clutch to be serviceable and re-install all the original parts, the high and low wear rings match up and you still have full surface contact. Life is good.
If you replace only the friction disc, the new disc will be flat, but the flywheel and pressure plate surfaces will still have the wear and the new friction disc will only make contact with the high spots on the flywheel & pressure plate surfaces.
The new friction disc might "wear in" but why do that to a new disc and also take the chance of the friction disc overheating and failing prematurely from slippage.
I hate doing the same repair twice!
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Re: Pressure plate and other parts

Post by AWOL43 » Tue Dec 13, 2022 12:10 pm

Time for the next parts to be identified.

The transmission that was in the GPW is a T90A, but with codes I can’t really find what this exactly for (besides CJ’s and M38 and all) or when it was produced. It appears to say T90A 1 3 H and maybe J 15 below. Anyone who can tell more about it?

And second photo is the battery tray that was on the frame. Obviously not a GPW one. Which raises the question, what is this one for then? Total non-Jeep bubba part or from a later model? As I also can’t find this one in the Jeep range.
And was there only one type of battery trays used for all production or is there a difference? As the GPW restoration standards book doesn’t mention this.
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Re: Pressure plate and other parts

Post by JAB » Tue Dec 13, 2022 3:16 pm

Battery tray is Bubba work. Here's some info on decyphering a T90. https://www.oldwillysforum.com/forum/in ... ost-227259
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Re: Pressure plate and other parts

Post by Mike Wright » Mon Dec 19, 2022 12:19 pm

AWOL43 wrote:
Tue Dec 13, 2022 12:10 pm
Time for the next parts to be identified.

The transmission that was in the GPW is a T90A, but with codes I can’t really find what this exactly for (besides CJ’s and M38 and all) or when it was produced. It appears to say T90A 1 3 H and maybe J 15 below. Anyone who can tell more about it?

And second photo is the battery tray that was on the frame. Obviously not a GPW one. Which raises the question, what is this one for then? Total non-Jeep bubba part or from a later model? As I also can’t find this one in the Jeep range.
And was there only one type of battery trays used for all production or is there a difference? As the GPW restoration standards book doesn’t mention this.
Look on page 195 of the GPW RESTORATION STANDARDS. 😎
Mike Wright
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AWOL43
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Re: Pressure plate and other parts

Post by AWOL43 » Tue Dec 20, 2022 2:23 pm

For the battery tray this little part appears to be welded onto the frame. Before I grind it off I want to make sure this does indeed not suppose to be on a GPW frame.is it suppose to be there or not? Thanks.
9924B7D2-0B22-4B16-BA7C-5B8A96EB6149.jpeg
Today I worked on removing the axles from the frame. More bubba work encountered. Very few correct deep nuts. Especially on the passenger side on the spring plates there were different types of nuts.
The front leaf springs appear original. Missing a bracket though on the passenger side. The front passenger shock plate is cut so needs replacing, (not sure how bubba had a shock installed there). Also am not sure if the drivers side one, visible at the bottom of the photo, is correc or cut or from a different type Jeep. It doesn’t seem correct though. Cleaning it might reveal an ‘F’, or not.
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The rear ones I’m not sure as the driver side doesnt have the proper brackets and the passenger side misses the top 9th leaf.
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Any ideas what the deal is with it all and what’s correct, original and not? Or to what Jeep certain parts belong to?
Last edited by AWOL43 on Tue Dec 20, 2022 7:31 pm, edited 1 time in total.

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Re: Pressure plate and other parts

Post by JAB » Tue Dec 20, 2022 3:27 pm

The bracket on the shock mount belongs in the scrap pile.

Most?/many?/certain?/all? jeeps with the torque reaction spring used two nuts that were stacked at that location (only) on each u-bolt, 8 nuts total at that corner. They were deep nuts, but not the normal 11/16 deep, but deeper than standard. It’s in the manual somewhere.
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Re: Pressure plate and other parts

Post by AWOL43 » Tue Dec 20, 2022 7:10 pm

Thanks Jeff, that sheds some light on those parts. Although Are you sure about those deep nuts as it appears there are only 4 plus 4 washers on each corner? Some of mine had the double stacked ones, but everywhere I see there are only 4 deep nuts per comer.
Next time at the GPW the grinder will take off the bracket.

Anyone about those shock plates and leaf springs? Especially the rear springs suspensions? One spring leaf suspension (driver rear) doesn’t seem to be original and the other missing a leaf. What does the driver rear otherwise belong to though and are the brackets correct on the passenger rear side with just a leaf missing? And if so, is there anywhere where one can get a leaf like that by itself?

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Re: Pressure plate and other parts

Post by JAB » Tue Dec 20, 2022 7:38 pm

AWOL43 wrote:
Tue Dec 20, 2022 7:10 pm
Thanks Jeff, that sheds some light on those parts. Although Are you sure about those deep nuts as it appears there are only 4 plus 4 washers on each corner? Some of mine had the double stacked ones, but everywhere I see there are only 4 deep nuts per comer.
Next time at the GPW the grinder will take off the bracket.

Anyone about those shock plates and leaf springs? Especially the rear springs suspensions? One spring leaf suspension (driver rear) doesn’t seem to be original and the other missing a leaf. What does the driver rear otherwise belong to though and are the brackets correct on the passenger rear side with just a leaf missing? And if so, is there anywhere where one can get a leaf like that by itself?
You'd have to check the parts book for the info on the nuts. I did several years ago when I was doing my '44 GPW and commented here. Maybe I can find that post in a search. The '42 I'm working on now is too early for a torque reaction spring. edit, found it; viewtopic.php?f=4&t=312904&hilit=torque ... ouble+nuts

Also, the specs for the individual leaves are in the manual. For GPW they changed to the heavier duty springs about the middle/end of October '44, depending on the assembly plant. I have several disassembled GPW spring sets and was trying to sell them $5/leaf but so far only the one good main leaf has sold. Let me know which sizes you're missing and I'll see if I have them.

On my '42 I found faint F's stamped into all four spring plates, but I did not find that with the '44, but maybe they were too faint.
-Jeff

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