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Rear main seal

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2wd definitely needs it, my guess is that 4wd shouldn't since the cross member is further to the front.
And since most of the 4x4 guys already proved it, I wonder if there was anything different with the truck that still needed the engine raised even though a 4x4.
Did it have 2wd engine mounts?
Did it have anything different from OEM?
Is it because it's a K5 maybe the trucks had it different?


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When I took off the oilpan,I unbolted the engine mounts,raised the engine and inserted 3/8" thick pieces of plywood between the mounts and crossmember.After that oilpan removal and installation was easy /forums/images/graemlins/thumb.gif
 
Chill out, man. I checked your bio and saw that your truck is a gasser so I made the comment about the gasser. For all I know, you are talking about your 350 gasser.

And by the way, the oil pump does have to be removed in order to even attempt to get the rear main bearing cap off.

It looks like our friend in Finland has the right idea...

Oh, and don't forget that if you have to raise the engine, to watch that you don't hurt your vacuum pump by crunching it into the firewall.
 
Just to add to the confusion...

On my '86 1/2 ton Chevy 4x4 long-bed pickup, I was able to remove the oil pan off the stock 6.2L diesel engine without lifting anything.....it cleared the axle without even jacking the truck frame up.

On my '81 3/4 ton 2WD Chevy converted to diesel, I have to remove the engine mount bolts and jack the engine up to clear the crossmember.

Casey
 
I don't know what the deal is, Casey. My /forums/images/graemlins/burb.gif is a stock 6.2 4x4 3/4 ton and I had to raise the engine. The oil pan would not clear the crank. I wonder if it is a 1/2 ton-3/4 ton crossmember thing. I don't see that the engine crossmember would necessarily be different between the 2wd and 4wd, but I could see it being different for the 1/2 and 3/4 tons.
 
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I don't know what the deal is, Casey. My /forums/images/graemlins/burb.gif is a stock 6.2 4x4 3/4 ton and I had to raise the engine. The oil pan would not clear the crank. I wonder if it is a 1/2 ton-3/4 ton crossmember thing. I don't see that the engine crossmember would necessarily be different between the 2wd and 4wd, but I could see it being different for the 1/2 and 3/4 tons.

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Actually it is different between 2wd and 4wd, but not different between 1/2 ton and 3/4 ton. /forums/images/graemlins/thumb.gif
 
Yep, I agree. The 2WD trucks have a huge cross-member supporting the whole front suspension. It's a real pain to do any bottom-end engine work in these trucks, because you can't get to the bottom end hardly at all.

The 4WD trucks just have a tiny cross-member holding the two frame rails together. The front axle supports everything else, really. Much simpler to get to everything.

Casey
 
Maybe I just gave up on getting it out too easy. I guess I was relying on previous experiences with our vehicles before I tried, but I could have sworn that there wasn't enough room. The next time I'm under it, I'll check it out a little closer. If I'd known to look, it would have saved the pain of getting the motor mount bolts out /forums/images/graemlins/thumb.gif.
 
I stand corrected. I looked closer and I guess I should have tried before I decided to raise the engine. /forums/images/graemlins/crazy.gif
 
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