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  #1  
Old 06-08-2012, 07:29 PM
Warlock III Warlock III is offline
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Default Oil Pans

Anyone have any idea why a 3.9 Dakota oil pan won't fit on a 3.9 1500?

I did a motor swap with a dealer reman for a "friend". His 3.9 blew a rod through the pan (2000 1500 4x2 43K).

So I put the long block together and the "Friend" got a used pan from a scrap yard. I was finishing up the job and while I was under there (he didn't realize the sump tube was in the path of destruction of the wayward rod and had to order a new one...and I wasn't going to wait to drop the engine in waiting for the sump tube)...anyway while I was under there I thought the sump valley looked a little funny but put it up there anyway. Oiled her up, spun it a few times to get some oil pressure, put the coil wire on and fired it.

Bap bap bap bap bap...shut 'er down. Waited until today and he was home and got in the garage to look at the swiss cheese pan. The sump valley (front to back) is about 10 inches the one he got is about 5 1/2 inches.

So I'm thinking...why in the heck would #5 and #6 rods come into contact with the pan???

I mean the 3.9 (94 and up) should be the same block/crank/stroke so what would make the pan different from a Dakota to a 1500? it just doesn't make sense. Is there a different stroke/crank between the two? Or is the dealer reman the issue?

Just wondering.
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Old 06-24-2012, 06:12 PM
Warlock III Warlock III is offline
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Default

I know all of you were on the edge of your seats in anticipation of an answer to this problem. Well I have it just for future reference in case anyone happens to run across this problem.

Problem wasn't the pan. It was the oil sump tube. The smaller sump area caused the tube to be lifted slightly and coming into contact with #4 crank journal.

Sleep well.
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Old 06-25-2012, 10:42 AM
huntergreen huntergreen is online now
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tks warlock, now i can sleep at night. lol
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