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  #1  
Old November 30th, 2009, 10:24 AM
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bottom end 3.9

Would it be worth while to rebuild the bottom end of a 3.9? The liners still have the honing marks could I get away with just replacing main bearings? Its got a knock and is only a matter of time. I think I already know the answer, but a v-belt front cover wont work on a serp truck correct?
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  #2  
Old November 30th, 2009, 03:22 PM
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Where is the knock coming from?
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Old November 30th, 2009, 05:16 PM
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sounds like the oil pan area, ive noticed some metal chunks in the oil lately.
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Old November 30th, 2009, 06:25 PM
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I would venture a guess and say it is likely not a main bearing. I would put my money on either a big end rod or wrist pin. That's such an easy and inexpensive repair that it would be worth doing. As long as you are in there, go ahead and do a re-ring and put in new bearings all around.
As long as the crank is still true and not worn excessively ( like not needing regrind) then you will always come out ahead having the machine work done over replacing with engine X.
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Old November 30th, 2009, 09:18 PM
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The top end of these motors wear much faster than the bottom end. If it as at the point that the bottom end needs work you may want to look at the top also. Cams, lifters and rocker shafts all are generally pretty well worn at 100k in the average motor and many are well worn much sooner.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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Old December 1st, 2009, 08:20 AM
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It had a complete top end timing set a few thousand miles ago. This is definitely bottom end. If it ends up needing bottom end work I am just going to do a 4.2 or 4.6.
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Old December 1st, 2009, 08:47 PM
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Gotcha, wasn't questioning your diagnosis. If the top end is already done and it's just rod bearings, I'd fix the damn thing.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

"Dedicated to the resurrection of junk through engineering?"
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  #8  
Old December 2nd, 2009, 06:56 AM
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Quote:
Originally Posted by junkyddog11
Gotcha, wasn't questioning your diagnosis. If the top end is already done and it's just rod bearings, I'd fix the damn thing.

I understand these can be done without pulling the engine right?
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Old December 3rd, 2009, 08:37 PM
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You could replace with the same bearings, but if the crank needs to be ground thaen it will need to come out. Not like it takes long to pull a motor.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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  #10  
Old December 3rd, 2009, 09:42 PM
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I am searching for a 4.6 that I anticipate having "modified" for optimal performance.
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Old December 13th, 2009, 11:23 AM
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This is a basic question, but what all is done in a top end rebuild? What do you think it would cost for a top end rebuild assuming you got all the parts from a place like D and D and you had a shop do it? Thanks
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