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Author Topic:   Bellhousing alignment
posted December 30, 2003 09:07 AM
Falcon transmission manual says to align bellhousing within .005 of crankshaft centerline. People around here say don't worry about it, just bolt it up and go. Anyone have experience in either case? Thanks

posted December 30, 2003 10:16 AM
To check, bolt the bell housing up to the block (don't forget the motor plate if you're using one). Place a dial indicator with a magnetic base on the back of the crank and have the indicator placed on the inside of tranny hole in the housing. Turn the motor over and see how much the reading changes as the indicator moves around the inside of the hole. As long as it's less than +/- .005, you should be alright. The Falcon does have a large allowance due to the input shaft that's splined on both ends. I wouldn't worry too much about it unless your bell housing is really bad.

posted December 30, 2003 08:23 PM
I agree with what Chad says on the design allowing some freedom. But if you want all the moving parts to wear like they should and the transmission to have less vibrations which typically will reasonate throughout engine parts, then do the right thing and just don't bolt up the bellhousing. Falcon just didn't make the **** up. The did it for a reason, call them if you don't believe me. I recommend the offset dowel pin method to center the bellhousing. Moroso makes .007", .014", and .021" offset dowel pins. You can order these through Summit. The part numbers are 37934, 37936, and 37938 respectively. You are probably going to need longer dowel pins anyways. These have the offset as well as the extra length to properly mount the bellhousing. If you do decide to go with these, Moroso tells you to drill small holes through the block to secure the dowel pins with a set screw. You can do this if you want, but the dowel pin bores in the block are tapered so it is really not necessary. I marked mine to see if they ever rotated and so far they haven't in 12 races.