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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-15-2009, 08:53 AM   #1 (permalink)
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HELP! Engine Swap

I am swapping a manual transmission motor into an auto transmission car. Motor will not connect to the bell housing. Stays about a 1/2 inch away from the bell housing. Will not mesh together. Is the crank shaft pilot bearing a different size for the auto than the manual? Cannot determine this without pulling it back out of the car. Must I just go ahead with this fate or just keep wiggling and pulling and shaking to get it in. Appreciate any help.
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Old 06-15-2009, 10:30 AM   #2 (permalink)
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If its only 1/2 away, I would say its just tight going over the line up dowels as they are just over 1/2 inch, I would put some of the studs/bolts in and pull it together.

This is what I had to do when I replaced my box.
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Old 06-15-2009, 11:52 AM   #3 (permalink)
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See if this thread helps

Different forum, but same issue with a happy ending:

WTF is the trick to mate the motor to the tranny? - Bimmerforums - The Ultimate BMW Forum
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Old 06-15-2009, 04:06 PM   #4 (permalink)
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Clarification of problem

I quess my question is I have a M20 motor that came out of a straight shift car. I am putting the motor in a car with an automatic. I replaced the fly wheel and clutch disk with the flex plate and torq converter for the automatic. I did not think to check the pilot bushing size. Are they different sizes depending on whether they are a straight shift or automatic?
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Old 06-15-2009, 06:14 PM   #5 (permalink)
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all I know is I did the same thing with an automatic 76 2002, swapped the engine into a 4 speed 76 2002. Needed a different flywheel and think that was it....on the 2002...I don't recall drive shaft, motor mount, electrical stuff being needed, just the flywheel assembly. Anyway, good luck
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Old 06-15-2009, 06:29 PM   #6 (permalink)
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the only think I can think of is that you might need to re pre-load your driveshaft center bearing, that might give you the clearance....best
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Old 06-15-2009, 09:15 PM   #7 (permalink)
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Problem Found

Had to remove Pilot ball bearing from crank shaft for the torque converter to fit inside the crank. The automatic does not need the ball bearing. Repulled motor, removed ball bearing, micked crank shaft from original motor = same diameter without ball bearing on the new motor. Put motor back in and everything matched up and bolted together. Time lapse = 3 hours but it is in. Now for the odds and ends. Thanks for all the help. Hopefully this might help someone else later
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