Finally started working on my M38

ocwd · Post by **ocwd** » Sat Nov 29, 2008 9:50 am

I got my engine back from the machine shop with minimal work needed. Now I just need to clean off some minor surface rust, give it a coat of engine primer, then some OD.

ocwd · Post by **ocwd** » Sat Nov 29, 2008 10:02 am

Now, I have two crank pulleys. The one on the left is heavier cast and the one on the right came with the engine. Is there a different pulley for the genset set-up? What is the difference between these two pulleys?

Post by **wesk** » Sat Nov 29, 2008 12:33 pm

The right hand pulley is original to your M38. The parts manuals all the way through the late 50's only show one Willys part number so I don't think there was any change between the M38 and the M38A1 but it could have been introduced after 1955. All of the service manual illustrations thru 1955 show the right pulley as well. The NOS RMC engine posted here a few days ago doesn't offer a very clear shot of the crank pulley but it appears to be the one in the right of your photo.

ocwd · Post by **ocwd** » Thu Dec 04, 2008 9:19 am

Thanks Wes.

Post by **Ryan_Miller** » Thu Dec 04, 2008 8:36 pm

Hey,

Have you sent Wes the data on your engine yet?

Casting numbers, serial number, etc.

ocwd · Post by **ocwd** » Fri Dec 05, 2008 8:31 am

I sent him the info and he emailed me the form for more information on my Jeep.

ocwd · Post by **ocwd** » Tue Dec 16, 2008 8:45 am

I got two coats of engine primer and one coat of paint on my engine this past week end. So far it looks nice.

Post by **Ryan_Miller** » Tue Dec 16, 2008 7:32 pm

Hey looks good.

I remember when I was at that stage.

Its always a good feeling when you start putting things back together.

ocwd · Post by **ocwd** » Wed Dec 17, 2008 8:41 am

Soooooooo many little parts needed. I am not looking forward to working on the transmission and transfer case. The oil, grease and surface rust are caked on pretty good.

ocwd · Post by **ocwd** » Fri Jan 16, 2009 8:57 am

I opened up my T-90 the other day. The low and reverse gear is worn. Also, the counter shaft gear below is worn. I am guessing that this is a common occurrence with these T-90 transmissions. Now I just need to get some replacement gears and a small parts kit. Does any one have suggestions of where to buy these parts? I am sure they are available at most parts places but someone may know where the best value can be found.

Post by **wesk** » Fri Jan 16, 2009 9:43 am

I think you'll find Novak & Advanced Adapters the best choices for quality, correctly hardened gear sets and shafts. The main thing is to insist on US made parts.

ocwd · Post by **ocwd** » Wed Mar 04, 2009 8:19 am

I got my T90 taken apart. The first and reverse gear that I bought turned out to be incorrect. I called the guy and he is replacing it. He suggested that I go ahead and replace my 2nd gear. He did not have any but suggested Rapco. My 2nd gear looks fine but I am told that this is a week point in the transmission.

Does anyone have any thoughts on replacing a seamingly good 2nd gear? It looks like they are about $60 new at Rapco.

Post by **wesk** » Wed Mar 04, 2009 8:28 am

Have you reviewed this web page on T90 overhaul?
http://www.willystech.com/wt/T90Rebuild ... ebuild.htm

TomM · Post by **TomM** » Fri Mar 06, 2009 7:20 am

Many gears are still available as surplus stock - NOS and USA made from vendors.
Also, Mullens had NOS brass synchronizer blocking rings available at a reasonable price. I found there is a huge difference between the construction of NOS and the repro. The NOS are much sharper and defined. I dont know if it will make a difference in shifting but they are so inexpensive its worth having them in your synchro.

When you get a small parts kit it should have a synchro rebuilding set of springs.

The rebuilding guide referenced by Wes and also the video which is about $5 made the rebuild straitforward.

Tom

ocwd · Post by **ocwd** » Mon Mar 09, 2009 8:37 am

Thanks guys.

Wes, I have been using that link as my guide for rebuilding. I have also sent a couple of emails regarding the rebuild video with no response.

Tom, I'll take your advice and get some NOS syncro rings. The cluster gear that I picked up is NOS. I fully expected the small parts kit that I ordered to have the syncro rings included. That's what I get for not asking. Replacing the syncro rings was always part of the plan. I had not planned on replacing the 2nd gear as it looks good.

Dave

willysmjeeps.com

Finally started working on my M38

M38

Crank Pulley

Pully

Engine

Engine

Parts

T-90

T90

T90

T90