Trooperthorn

Ever since I killed my dowel pin a couple of years ago I have had a front engine oil leak. I notice it every time I park. Even after a couple of minutes there is a puddle of fresh oil. Eventually the leak stops when parked as the leak is apparently above the resting oil level. When I did the dowel pin and case bolts I installed a new crank seal. I had noticed some wear on the crank, but tried to locate the seal in the cover to miss any grooving on the crank. Last winter, I replaced the oil pan gasket. I could tell as soon as I got the pan off (not an easy task with the engine in the truck) that I was not going to fix the leak. The gasket looked perfect and there was a trickle of oil coming off the timing case above the pan lip. I have pretty much decided I have a bad seal where I RTVed the timing cover to the case, a leak at the crank seal, or a cracked case.

1. Is there a possibility that the seal is bad between the case and the block? I have not even explored if this is possible. That would be something I do not want to deal with.

Today, I tore into the beast (1977 RC with 91.5 CTD conversion). When I removed the dampner/balancer things were wet with oil, but there was no telltale as to where the oil was coming. Thankfully, there was no sign of a crack in the case below the timing cover.

Upon removing the cover the RTV I had used as a sealer instead of a gasket looked continuous and uniform, so I don't think is was leaking there. Then inspecting the end of the crank, This is what I found:



2. Is there a sleeve available for this? If so, Part #?

3. I am almost sure this is the source of my leak. Aside from a sleeve, what is the fix?

Thanks for enduring my wordiness and thanks for your help. Eric

Partsdude

I no longer have access to Cummins Quickserve, but if you take your ESN to any shop that has the big red C displayed, or a Case dealer, or any Komatsu dealer they will be able to run your ESN and find the seal that has a sleeve.
The only other option besides the seal and sleeve is to weld and machine the crank. Not cheap as you have to tear the engine down.

BILTIT

''This seal is the one with the wear sleeve ad the part # is 3802820.''

Taken from here:

https://www.dieseltruckresource.com/...d.php?t=126282

maxwellp

http://api.viglink.com/api/click?for...13124231086713

Crank shaft grooved? This is the only way to get it to seal up correctly.

Includes sleeve you install to cover the crank shaft, allowing for a tight seal.
Cummins: 3802820

bgilbert

Next time install a gasket. Way too cheap not too.

Trooperthorn

Thanks folks. Got the seal and speedy sleeve ordered.

Bill, sell me on the gasket. I've got nothing against using one. I just usually forget to get one. With a gasket do you still have to mess with sealer?

bgilbert

It's about $20 bucks. I would just hate to have to tear everything apart again because it's leaking between the cover and housing. Then possibly damaging the crank seal upon removal/install etc, only to have to do the job AGAIN!

The Cummins book states using sealer on one side of the gasket only. Can't remember off the top of my head which side. I use Ultra black rtv on both sides of the gasket. Been successful on 6 different kdp jobs/trucks.

92smokin blacky

My crank was grooved and I didn't spend the extra money on a speedy sleeve when I did my kdp. I just sat the seal farther back than the groove, hoping it'd seal up fine. It was fine for a few months then started leaking just a little and now its leaking a lot. So I need to order a speedy sleeve and do it right... im kinda mad cuz these cummins seals/ gaskets are pricey and I just changed em this winter. Looks like ill be spending aboout another $130+ for the seal, speedi sleeve and fromt cover gasket to fix it right. Or I may use a Napa front cover gasket I got sittin here from my buddys truck.

I shoulda done mine right in the first place cuz it woulda saved me money in the long run instead of buyin two sets of seals...

JD730

Anyone I've taken apart was RTV'd to the cover, All the ones I've done I put a little RTV on the cover side.

maybe368

X2, more than anything it is a way to facilitate assembly by keeping the gasket in place. It's an oooold trick, especially for valve covers and oil pans. It also allows disassembly without damaging the gasket, for re-use....Mark

Trooperthorn

Thanks again.