Weird oil leak

The place to discuss problems and routine maintenance questions and tips. This is for topics that are specifically diesel-related.
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I'm luving it
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Weird oil leak

Postby I'm luving it » Thu Feb 13, 2020 11:59 pm

I have had an oil leak for awhile and finally decided to address it...then I find this....it looks like the gold freeze plug looking plate is leaking. Any one ever seen this leak? Any other ideas? Looks like my rear seal is leaking and my transmission seal is leaking. I’ll contact Jerry and see if he has a replacement.
Sorry pictures are turned sideways....
Attachments
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HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

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I'm luving it
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Re: Weird oil leak

Postby I'm luving it » Fri Feb 14, 2020 12:32 am

Found this in old post after searching. Sent an email to Jerry. Hopefully I can get this fixed fast.


“REMOVE THE REAR ENG TRANS ADAPTER PLATE , ON THE PASS SIDE OF THE ENG UNDER THE PLATE THERE IS A LARGE ABOTU 2 1/2 IN DIA CORE PLUG THAT SHOULD BE FLAT IF FACTORY IT WILL BE BRASS COLORED , IT IS THE CORE PLUG FOR THE CAMSHAFT BORE , AN D IF THE WRONG TYP OR INSTALLED WRONG IT CAN LEAK , THERE IS ALL SO A SMALL CORE PLUG RT AT THE END OF THE OIL GALLEY RIGHT CLOSE TO THE IS LARGE PLUG , SAME WAY WRONG PLUG OR INSTALLED WRONG IT WILL LEAK,”
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

2sk8
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Isuzu vehicle(s): 91 Isuzu Pick up converted to diesel

Re: Weird oil leak

Postby 2sk8 » Fri Feb 14, 2020 1:25 am

That big gold looking plug is the camshaft plug.

You could replace the plug but it will be a LOT of work(Need to remove the camshaft and many many parts...).

You could replace that plug (And install new sealer) when you do a rebuild, since having the engine out makes it a lot easier.

For now the best thing to do: Clean around the plug with some break cleaner or any other good de-greaser.

Get it really clean and put a bunch of Permatex oil resistant silicone all around the plug.

And you should be fine.

- Ivan

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Halden
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Re: Weird oil leak

Postby Halden » Fri Feb 14, 2020 12:33 pm

On my rebuild I put red loctite on the oil gallery and cam shaft plugs. They will pretty never come out until you really want them to.
It's not pronounced "Ih-soo-zoo", it's pronounced "It-screws-you"
83 LS Long Box Dsl 4x4
82 Short Box Dsl 5 spd
64 Chevy C20 w/ 283 & 4 speed.
05 Sonata with a standard

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I'm luving it
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Re: Weird oil leak

Postby I'm luving it » Fri Feb 14, 2020 7:27 pm

Ordered new seals from Jerry. They never leaked until I installed a turbo oil pump......maybe it has higher oil pressure.
Knock them sideways and pull them out?
Drive new ones in with bearing/race installer?
I’ll try the red loctite or some sealer.
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

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Halden
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Re: Weird oil leak

Postby Halden » Fri Feb 14, 2020 10:29 pm

They are called Welch plugs. They drop in, then you deform them, use something fairly sizable and flat and hit it with a hammer.

To remove them stab a small screwdriver in and take them out.
They can't be knocked in sideways. There is a lip on the block that they sit against.

There shouldn't be any pressure behind the cam plug. I'd red loctite those bad boys in there and really make sure they don't come out.

If you dent those plugs they don't hold as good. Just deform them so they aren't domed. Maybe half the surface area.
It's not pronounced "Ih-soo-zoo", it's pronounced "It-screws-you"
83 LS Long Box Dsl 4x4
82 Short Box Dsl 5 spd
64 Chevy C20 w/ 283 & 4 speed.
05 Sonata with a standard

FiatSpider2
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Re: Weird oil leak

Postby FiatSpider2 » Sat Feb 22, 2020 8:06 am

Be sure that the recess is clean and smooth too. The plugs won't seal very well if there are any marks left from removing the old ones or any rust left. A good sealer will help if there is any pitting of the sealing surfaces and will prevent water from getting in causing more corrosion.
FiatSpider2 (4FB1 Isuzu Turbo Diesel powered 1978 Fiat Spider)

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Re: Weird oil leak

Postby I'm luving it » Sun Mar 01, 2020 11:34 pm

Got it out and put a new one in. Thanks to help form Jerry!
“ DRILL A SMALL HOLE IN THE CENTER AND SCREW A SMALL SELF DRIOGING SCREW IN TO THE HOLE IT WILL BOTTOM OUT ON THE BACK OF THE CAM SHAFT AND PUSH IT OUT , COAT THE NEW ONE AND JUST SET IT IN THE SPACE AND SMACK IT RIGHT IN TH E CENTER WITH A BALL PEEN HAMMER IT WILL CAUSE IT TO TRY AND TURN BACK WARDS AND SEAL AND LOCK IT SELF IN PLACE , I WOULD USE PERMATEX ON THE EDGES TO SEAL IT UP.”

New one in:
8BD89408-7DBD-4932-9805-1DA6367760F0.jpeg

What it looks like behind the plug.
E4AF8FAC-F1DB-478B-9154-20407F13FD70.jpeg

Removal method.
AF27920D-6E38-4084-B553-6AA8B17BD0B6.jpeg
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

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I'm luving it
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Re: Weird oil leak

Postby I'm luving it » Mon Mar 09, 2020 12:03 am

Well got it all back together and still leaking......these leaks are killing me. If it doesn’t sell I’ll be tearing it back down someday.
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

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puttputtinpup
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Re: Weird oil leak

Postby puttputtinpup » Mon Mar 09, 2020 7:54 am

Bummer! What's the other smallest plug for? It looks damp with oil also. Is the oil line behind the head dry?

In 1992 or 3 I worked on my 81 pup diesel for many hours on my back on carboard & gravel with truck on ramps. Hand tools only pulling the trans and replacing the rear main seal. Put it back together and still leaked. So frustrated I sold the truck. Many years later Jerry told me it might have been leaking from behind the oil filter. A line runs oil up to the back of the head. Both locations could sometimes leak and run down

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I'm luving it
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Re: Weird oil leak

Postby I'm luving it » Mon Mar 09, 2020 8:51 am

When I had it apart I checked those. I’m pretty certain it’s that plug. But I’ll check it again when I pull it apart....
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.

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Re: Weird oil leak

Postby I'm luving it » Tue Mar 17, 2020 8:38 pm

After lots of research it looks like I didn’t deform the core plug enough to seal it properly. So hopefully 2nd try works. I found this write up for future reference. http://www.spriteparts.com.au/tech/welch.html
And here is a picture from same website.
642A0616-9301-4BC9-AD60-50E5AC98E8BA.jpeg
HAD***1981 Turbo Diesel, long bed, 4x4, 5 speed, 5.29 locked Toyota axles, 33/10.50/15 tires, 2.5” exhaust, GT1548 turbo, 12 pounds of boost, intercooler, 30 mpg.