73-87 Chevy _ GMC Trucks > Engine/Drivetrain

78er 250 inline 6 changing crankshaft main seal

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ChrisD:
Hi,

at the moment i'm a bit frustrated. I told in another thread, that the manual transmission was oiling everywhere, so i released it put new seals and so on init and put it back in place. I meant, that was the place where all the oil came from.

i was sooo wrong!

today, the engine runs the first time after, for more than 2-3 minutes and i can say, the oil isn't runing, but near by.
so i haft to change the two parts of the crankshaft main seal.
I already looked into the service manual, and i'm happy that i dont have to release the crankshaft.

But now i have some questions
1. Must i release the transmission again, or can i do this without that?
2. I read, that i have to release the oil pan and oil pump. Is that possible with engine in place and the car not lifted?
3. Can I change the seal while lying under the car (i've no other way)

yesterday, i tried to change the intake manifold of the BMW, and this was also not successfull, because i realized that i need two little new seals, both together not more than 5$.....

sometime when it's raining, it rains heavy (it's a german saying, don't know what you say if more than one goes wrong)

frustrated regards

Chris

VileZambonie:
The process is essentially the same as the V8 two-piece rear main seals. There are plenty of posts on how to do it here with tips on installation. After you drop the pan, the rear main bearing cap needs to come out. I suggest staggering the seal ends so that they are not parallel to the bearing cap and cylinder block.

ChrisD:
Hi,

okay, i hadn't thought that i6 and v8 are so similar.
Thanks for the enlightment, i'll search through the forum

regards
Chris

bigben5054:
Chris, here is a picture I took out of my 1979 service manual.  The section starts on the previous page, but I did not attach that page - it just says remove oil pan, oil pump and rear main bearing cap.  I don't know whether you can get the pan off with the motor in the truck, but I would have to think you can.  You might want to invest in a service manual for your truck.  There is a lot of useful information in these manuals.  Used ones can be found pretty cheap on eBay.  I think I found mine for $15.  Good luck!

bigben5054:
Here is the page on oil pan removal/install.  Looks like you might have to raise up the engine a little bit.  That's "by the book" anyways. 

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