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Old 10-10-2021, 03:46 PM   #1
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Post C7 Oil Galley Plug R&R??

Only took me 2.5 days to isolate my oil leak, but seems it's coming from an oil galley plug on the front left corner of the head, behind a hoisting bracket. It's a SUPER fun spot to get too and even more fun to video that area while the engine is on high idle at 1250rpms...

I'm attaching a picture with the area pointed out and circled. It's a 15mm allen head plug and I'm going to guess it has an o-ring on the backside. Best part is when I finally isolated my leak to this plug, it's basically the end of day 2 working on this and I'm about whiffed. I don't have a replacement part for it and I can't seem to get the darn plug to budge one way or the other. More than likely I'm going to need a breaker bar on it from below where I can get some real leverage and length on the bar rather than using a 12" long 1/2" ratchet.

Anyone replaced one of these before? I'm either going to have to order the plug or o-ring to replace and see if I can muscle it out on my own OR take it to a local diesel mechanic to do the same thing for me. I don't have an issue doing it nor do I have a lack of tools. What I do lack is time and a correct part number to replace it and not sure if it's going to be an entire plug w/o-ring or just an o-ring.

Would love to hear from anyone that has had to replace one of these before.

Thx in advance!
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Old 10-10-2021, 07:51 PM   #2
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Quote:
Originally Posted by SpencerA View Post
Only took me 2.5 days to isolate my oil leak, but seems it's coming from an oil galley plug on the front left corner of the head, behind a hoisting bracket. It's a SUPER fun spot to get too and even more fun to video that area while the engine is on high idle at 1250rpms...

I'm attaching a picture with the area pointed out and circled. It's a 15mm allen head plug and I'm going to guess it has an o-ring on the backside. Best part is when I finally isolated my leak to this plug, it's basically the end of day 2 working on this and I'm about whiffed. I don't have a replacement part for it and I can't seem to get the darn plug to budge one way or the other. More than likely I'm going to need a breaker bar on it from below where I can get some real leverage and length on the bar rather than using a 12" long 1/2" ratchet.

Anyone replaced one of these before? I'm either going to have to order the plug or o-ring to replace and see if I can muscle it out on my own OR take it to a local diesel mechanic to do the same thing for me. I don't have an issue doing it nor do I have a lack of tools. What I do lack is time and a correct part number to replace it and not sure if it's going to be an entire plug w/o-ring or just an o-ring.


Thx in advance!
They are tight. Take a large punch 3/4" diameter and good size hammer 4pounder and smack the large plug several times straight on, this usually helps loosen the plug. And it needs a oring seal. But get it from Caterpillar because that plug is for HEUI high pressure oil galley. That pressure goes as high as 3900Psi and is exposed to fairly high temperatures. Do not use will fit oring. You'll regret it if you do. Hope that helps. Safe Travels
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Old 10-16-2021, 02:18 PM   #3
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Originally Posted by Cat View Post
And it needs a oring seal. But get it from Caterpillar because that plug is for HEUI high pressure oil galley. That pressure goes as high as 3900Psi and is exposed to fairly high temperatures. Do not use will fit oring. You'll regret it if you do. Hope that helps. Safe Travels

Amen ; to purchase the O ring from Cat .

After three uses ( I am a slow learner ) of a high temp/pressure O ring from other sources on a different section of the HEUI oil pressure system and failures after 3,000 miles , I went to Caterpillar for the OEM part and have 12,000+ miles on the repair with factory part.

In my defense , not having a local Cat dealer ; nearest being a 50 min ferry ride and 2 hour drive away ; led me to trust a local truck repair shop , that said we use these, O rings, all the time .
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Old 10-17-2021, 05:33 AM   #4
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Originally Posted by Skip426 View Post
A

In my defense , not having a local Cat dealer ; nearest being a 50 min ferry ride and 2 hour drive away ; led me to trust a local truck repair shop , that said we use these, O rings, all the time .
I buy my my CAT parts from the on-line store and have them mailed to me.

Just bought two fuel filters and there was no shipping charge (However the on-line price may be higher than buying in person. I don't know).

https://parts.cat.com/en/catcorp
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