D4-7U OIl filter leak

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rhomium

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Hello,
I'm new to the forum, have been searching quite a few posts this morning but haven't had much luck answering my question. I have a D4-7U serial #7U13670 that has developed an oil leak from the bottom of the oil filter canister. I removed the canister last night thinking I would find a blown seal or something. There wasn't anything there, no o-ring, no rope, nothing between the canister and the filter base. So my question is, isn't some sort of a seal supposed to be there or not? The nut to remove the filter housing wasn't very tight, so I thought maybe that is the reason. I have changed oil in this Cat 3 times since I have owned it, and never have I removed the filter housing. Since there isn't a seal currently, it must have been that way for quite a few years before it started leaking yesterday.
Thanks for any help.

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Thu, Apr 18, 2019 9:21 PM

ccjersey

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Any chance it takes the same square seal as the top of the canister? Got any old/ spare ones around? Those seem to accumulate on me since I am usually too lazy to dig a perfectly good one out of the groove in the top just to replace it. Might just buy your next new filter and get one that way.

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄

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Thu, Apr 18, 2019 9:35 PM

Old Magnet

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Reply to ccjersey:

Any chance it takes the same square seal as the top of the canister? Got any old/ spare ones around? Those seem to accumulate on me since I am usually too lazy to dig a perfectly good one out of the groove in the top just to replace it. Might just buy your next new filter and get one that way.

Top gasket is a 5B5937, bottom canister gasket is a 5B5940.
Dig around in the bottom groove. They are usually rock hard and a bit of a challenge to remove and clean up the groove for a new replacement. Takes a long deep socket to remove the retaining nut.

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Thu, Apr 18, 2019 9:52 PM

Ray54

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Reply to ccjersey:

Any chance it takes the same square seal as the top of the canister? Got any old/ spare ones around? Those seem to accumulate on me since I am usually too lazy to dig a perfectly good one out of the groove in the top just to replace it. Might just buy your next new filter and get one that way.

As CC I generally leave the seal rings alone. But after having some seeping on the bottom of the canister I ordered some of the Cat seal rings as the extra top ones where not right. Was a bigger job than I thought to dig the old ring out and clean the grove out. So I am guessing you do have some "petrified" rubber in the grove. Working with a shape pick it came out in small chunks.

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Thu, Apr 18, 2019 10:01 PM

D4Jim

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Reply to Ray54:

As CC I generally leave the seal rings alone. But after having some seeping on the bottom of the canister I ordered some of the Cat seal rings as the extra top ones where not right. Was a bigger job than I thought to dig the old ring out and clean the grove out. So I am guessing you do have some "petrified" rubber in the grove. Working with a shape pick it came out in small chunks.

The brand X (Not Cat) oil filters I use do not come with gaskets for the housing but I have been getting the gaskets on eBay. I replace them every couple of years as they are easy to remove then and not dried and crumbly if let go for years.

PS: Make sure the engine oil is not getting diluted from diesel in the crankcase and that causing the leak.

Cats Forever

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Fri, Apr 19, 2019 2:55 AM

Rome K/G

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Reply to Ray54:

As CC I generally leave the seal rings alone. But after having some seeping on the bottom of the canister I ordered some of the Cat seal rings as the extra top ones where not right. Was a bigger job than I thought to dig the old ring out and clean the grove out. So I am guessing you do have some "petrified" rubber in the grove. Working with a shape pick it came out in small chunks.

You have to almost chisel those old o-rings out. It takes a 1 3/8" socket 5 1/2" deep to remove the nut. Some transmission filter housing can nuts are 1 1/2"

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Fri, Apr 19, 2019 2:55 AM

rhomium

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Reply to Rome K/G:

You have to almost chisel those old o-rings out. It takes a 1 3/8" socket 5 1/2" deep to remove the nut. Some transmission filter housing can nuts are 1 1/2"

Thanks for input guys. I was able to call Cat this morning and they have a seal in the mail to me.

I thought the same as you guys that the old one would be rock hard. Got the picks out and started scraping, but I was scratching bare metal, no chunks of rubber to come out. I don't think there has been one since I've had the tractor. No idea why it didn't leak more.

I'll put the seal in and clean it up, then it's time for a for sale sign.

Again, thanks for the help.

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Fri, Apr 19, 2019 4:33 AM

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