Changing Rear Main Seal

[cobra5]

Well I'm finally getting around to getting this done but the credit has to go to my 20 yr. old son who is all over it. He started prepping the job on Sunday and when I got home from work yesterday there was a transmission on the shop floor. I went inside to change clothes and he had already removed the pressure plate, clutch and flywheel. I wish I had his energy. So now I have a question, what clutch type is the correct one to install? I have the five finger plate which to me is odd looking but I see kits available that look like a normal disk type. Ok and since everyone likes to look at photos, I have a few for you guys. This is an Air Force truck that had a little more than 5,500 miles on it so I think the rear main dried out due to lack of use. Anyway, I'm going to replace the clutch disk and either have the pressure plate and flywheel resurfaced or just leave it alone. I know that's normally a big no no but, with so few miles, little wear, and the fact that I don't really drive that often I can't justify the added expense. Anyway enjoy the photos and let the questions/concerns begin.

Clutch

Pressure Plate

Flywheel

Transmission Front

Transmission on Jack

Flywheel Before Removing

 

[clinto]

I don't remember there being a bunch of different discs (I've seen 5 and 6 puck units) but there are 3 and 4 finger pressure plates.

http://www.steelsoldiers.com/showthread.php?32550-Duce-clutch-disk-pucks

http://www.steelsoldiers.com/showthread.php?11782-THIS-CLUTCH-TOO!!!!!UPDATE-see-last-post

http://www.steelsoldiers.com/showthread.php?11210-Clutches-Pressure-Plates-Confusion

http://www.steelsoldiers.com/showthread.php?65517-Busted-Pressure-Plate

http://www.steelsoldiers.com/showthread.php?90016-3-finger-Pressure-plate-difference

http://www.steelsoldiers.com/showthread.php?109948-Rebuilding-Clutch-Pressure-Plate

http://www.steelsoldiers.com/showthread.php?79311-M35a2-clutch

http://www.steelsoldiers.com/showthread.php?53854-Clutch-part-Qs

Short answers:

Either style is correct, one is new and one is old style

No way I'd do all that and not surface a flywheel.

Remember to reseal the trans-some of the bolt holes are open, so I take all the bolts out, get them spotlessly clean and then put everything back together with RTV.

 

[steelandcanvas]

Nice to see someone else is a strong believer in resurfacing the flywheel. I would never do a clutch job without spending a few bucks at the local machine shop.

 

[gringeltaube]

...... I'm going to replace the clutch disk and either have the pressure plate and flywheel resurfaced or just leave it alone. I know that's normally a big no no but, with so few miles, little wear, and the fact that I don't really drive that often I can't justify the added expense. .....

What you have there are the most common (early style) clutch parts to be found behind most every Deuce multifuel engine. It's a 4-finger pressure plate and the (metallic)5-pad clutch disc.
I just don't see that "little wear" anywhere... more like the opposite! So do yourself a favor and have the FW and PP resurfaced and balanced.



G.

 

[cobra5]

Well after degreasing and inspecting the flywheel and pressure plate, I will be taking them in to get resurfaced. I'll be taking these to an outfit that works on commercial trucks, buses and motorhomes.

 

[cobra5]

So I've been researching threads looking for info on clutch aligning tools. Someone posted the NSN for the military kit 5180-00-449-3785. I crossed that to a Snap On kit, P/N A37M. I really don't need the kit so I kept on looking through threads and someone else posted measurements of the inside diameter of the pilot bushing as 3/4". So my question is, will a 10 spline x 3/4" dia. alignment tool work?

 

[cattlerepairman]

I have not verified this, but someone posted that the alignment tool for a Ford 7.3 Powerstroke fit perfectly.

 

[gringeltaube]

..... my question is, will a 10 spline x 3/4" dia. alignment tool work?

For that tool you'd need to specify 10 splines on 1-1/2" - with a 3/4" pilot diameter.

If you had access to a lathe you can easily make your own tool, by using a short piece of 1-1/4" round bar (below)
The splines are not necessary, really.




G.

 

[pigfoot63]

I would put a new pilot bushing while I had it a part.

 

[VPed]

I rifled through my socket collection and found a deep socket that fit snug in the pilot bearing I.D. I found a standard socket that fit snug in the clutch disk I.D. The deep socket fit slightly loose inside of the standard socket. (May nave been on the square drive end, don't recall exactly) I used tape evenly wound on the deep socket to take up the play. Inserted the assembled mess in the pilot bearing and placed the disk on. Installed the pressure plate loosely until we put slight upward pressure on the disk so the socket slid easily, then tightened the pressure plate bolts. It worked great as a pilot tool. I know, a picture would help but I just cannot seem to think about the camera, let alone clean up the hands, when on many of these tasks.

 

[silverstate55]

So I've been researching threads looking for info on clutch aligning tools. Someone posted the NSN for the military kit 5180-00-449-3785. I crossed that to a Snap On kit, P/N A37M. I really don't need the kit so I kept on looking through threads and someone else posted measurements of the inside diameter of the pilot bushing as 3/4". So my question is, will a 10 spline x 3/4" dia. alignment tool work?

Current clutch alignment tools info can be found here:

http://www.steelsoldiers.com/showthread.php?149854-Rear-main-seal&p=1991737&viewfull=1#post1991737