| From | Message |
clutchpac
Dodge Dakota
JOIN HERE
4/20/2002
19:59:22
|
 Subject: pre magnum V6 cranks
IP: Logged
Message:
have a 89 with a blown engine. got a 2nd engine ( junk yard--$50) with 100+K on it. was told it was out of a 90 modle. pulled it down and went through it. new valve guides, new .030 pistions w/new wrist pins. turned the crank .020 on the rods but mains were ok. got the thing ready to go in and went to install the pilot shaft bushing and...oops! won't fit as there is no boss in the crank to hold it.
boils down to is there are two cranks used. one for automatics and one for standards. and there is no way to make an automatic work.
how do i find out the exact production date of the replacement block. i found these # on the engine:
on the rt front just below the deck are
8M239 08210963 stamped in the block.
on the left side between the rear of the engine and the motor mount CAST into it are
4323730-V6-2
below that also cast in are
6 : 26 : 87
a replacement crank is not available from mopar - discontinued. need to get one in aftermarket and need to be sure on the year of the engine.
thanks
|
FazDak
GenII
4/20/2002
20:58:12
| RE: pre magnum V6 cranks
IP: Logged
Message:
Just have a good machine shop drill the pilot bushing hole in your good crank, did it all the time in the old days.
Scott
|
clutchpac
Dodge Dakota
JOIN HERE
4/20/2002
22:27:34
| RE: pre magnum V6 cranks
IP: Logged
Message:
the problem is there is nothing in the back of the crank to drill. there is an adapter fitting that is pressed into the rear of the crank. the pilot bushing is then pressed into the adapter fitting. the adapter fitting is not available. the fitting is what makes the crank an automatic or standard application.
|
FazDak
GenII
4/20/2002
23:35:46
| RE: pre magnum V6 cranks
IP: Logged
Message:
BS.
Get a pilot bearing from any truck parts store that measures the ID you need then have the crank drilled to match the OD of the new pilot bearing.
No lie, I have personally done this, we used to do it all the time when we found an auto. forged 340 crank and wanted to put it behind an A833 4spd car.
Unless the "adaptor" does more than fit in a hole in the crank and then the pilot bushins goes in it than I am not sure what the hell it is, but I just looked it up in a cheap Dak manuel and it looks pretty simple to me. ( I will admit the picture wasnt very good though)
Good luck, Scott
|
dodgelover
Dodge Dakota
JOIN HERE
1/06/2004
22:48:35
| RE: pre magnum V6 cranks
IP: Logged
Message:
Had the same problem with my 90 D150 with a 3.9L v6 and NP 2500. The dealer came up with the adapter and bushing. It was listed as simply a bushing and there was no picture of it. He just ordered me a selection of them. I didn't think it would work, but I took it home anyway. Then I read this page and a light came on in my head. The adapter is quite large as I recall. Probably 2.25" and came with the bushing already pressed in. I installed the rounded edge toward the front of the block, and have 15,000 miles on it without any problems. Happy Hunting! Steve
|
J and J Auto
GenII
1/07/2004
04:42:29
| RE: pre magnum V6 cranks
IP: Logged
Message:
I have also drilled the pilot hole in a lot of
forged 383 2 bl motors they were not drilled and
to use the good fordged crank in a 400 or 383
with a 4 speed you need to drill them
Larry
J&J Auto
|
vern
Dodge Dakota
JOIN HERE
1/07/2004
14:48:20
| RE: pre magnum V6 cranks
IP: Logged
Message:
these 3.9s use a different deal than the old school [340s,383s,440s etc]
its a large piece of alum.drilled for the pilot shaft.the piece fits the crank out near the edge
of the flange where the flywheel bolts on.
you have to remove this alum.adaptor to install a automatic trans,because it won,t let the torque convertor fit into the crank[the nub on the front of the convertor]
i have,nt checked or measured if you can just drill the crank like fazdak and larry stated.
but we used to do this with the big blocks.
i,d check that out, it could save you some time and trouble.its not that hard
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
