LB7: Leaking oil from intercooler and bellhousing

[kenp313]

I recently finnished rebuild ing my lb7 and now have 150 miles on rebuild. I noticed a few days ago that there is an oil leak and is dripping from where the bellhouse meets the rear engine plate. Any ideas of were it could be leaking from

Have another leak that i found yesterday from the intercooler. I blew my driver side (@intercooler) intercooler boot and had to drive it how as is. Now indee a bunch of drips in the drive way.
Thanks in advance for any help

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[IOWA LLY]

From your description it's probably the rear main seal. Did you use the proper installation tool?

Your leak out the intercooler is probably from the turbo.

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[kenp313]

Thanks for the quick reply. I used the merchant driver tools and the turbo has less than 2k on it. It is a fleece cheetah if that helps at all

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[DAVe3283]

What brand rear main seal did you use?

Other things to look for with oil in that area are the oil cooler and if your turbo oil feed comes off the rear of the block. I had a weeping turbo oil feed that ran down and looked like a bad rear main at first.

 

[kenp313]

I believe it was Victor. All seals came from cotnp.


It looks like it is coming from the square hole at the 6 o'clock position of the bell housing

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[Awenta]

What kind of oil?

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[kenp313]

Rotella 15/40

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[DAVe3283]

I believe it was Victor. All seals came from cotnp.


It looks like it is coming from the square hole at the 6 o'clock position of the bell housing

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That's the same seal (and store) I used. If you used the seal driver and set the depth correctly, it shouldn't be leaking. I'd look really close for oil leaking near the oil cooler and at the turbo oil drain. Both of those locations will run down and appear to be coming from that hole.

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[kenp313]

Going to go out with a flash light and give er a look.

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[05_LLY]

Victor seal are junk lately..I've had a handful or two of them if you tear them apart the glue they use to make them is all over the sealing surface causing them to leak.....I used to use a lot of them.....back to all GM now

 

[kenp313]

Back in from looking. I found oil in my intercooler so I removed the tube from the turbo outlet and and put the truck in high idle........and it was.... oil. !!!! My question is this. How does a turbo with less than 2k take a shit like that

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[Awenta]

Rotella 15/40

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I meant is it engine or transmission oil.

Post a pic of how much oil is coming from the turbo. Should be pretty clean at 2k. Time for a warranty replacement.

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[kenp313]

Upon further inspection I'm still up in the air. It's blackish red (possibly front pump seal among other problems )

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[kenp313]

I'll have to take pics tomorrow. The out let is perfectly clean untill.i high idle it then you can see oil.comming out. The lower d/s cac boot has a nice puddle in it. Is it possible that I have high oil pressure? When I start my truck and drive around its around 65-80 psi on the dash ( 95 -99 degrees outside)

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[DAVe3283]

I've blown up a turbo with less than 5k miles before. Twice. Pushing it too hard will kill the bearings and then blow a shaft seal. Not sure if that happened for you, or just a defect the warranty should cover.

80 PSI is on the high side, but as long as it comes down when the truck warms up, I wouldn't think there is a problem with pressure. If you ran an aftermarket oil feed line, many turbos require a restrictor to prevent pushing oil.

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[kenp313]

Oil pressure come down at idle but at around 1500 rpms it's at around 65 or higher at operating temp. I contacted fleece today and they said it's possibly the oil pressure causing it to leak or I need to check for shaft play. I checked the shaft play ..... up and down seemed Normal but in and out was audible then pushing and pulling.
........ also I'm running the supply line that was supplied with the kit
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