Re: Pilot Shaft to Bronze Pilot Bushing Clearance
Also,in many cases " post install " the ID of the stock type pilot bushings is reduced significantly/enough (due to a very tight interfearance fit) to cause issues with even worn input shafts not being able to fully seat/enter the pilot busing not allowing trans to properly/fully seat against bell hosuing.
I have run into this 1st hand on the last 4 of 4 motor installs on man trans chevelles i have done in past few yrs.
I had to use a dremel tool with fine grinder to carefully/as evenly as possible remove just enough material to allow the input shaft to enter the bushing.
No issues post doing that on those cars 1 of which was my car that has gone over 7kmiles since doing that .
BYW,i have been at this stuff for over 40yr now and havent had any issues with input shafts not going into pilot bushngs post install untill the last 4-5 yrs when the mfg of some pilot buyshings went off shore.
And that includes my cars motor that i have owned for over 33yrs where motor and trans were out a few times over the 33 +yrs with same crank in motor the motor so no change there at all and no damage to crank where pilot bushing seats either.
The mfg tollerance & or metarial the pilot bushing are made of must have changed a bit over the yrs which why we are now having this issue that i see other fellow t/cr's had issues with over past few yrs too.
So do yourself a favor and install the pilot bushing in the crank with motor on hoist/cherry picker
& then prior to installing flywheel,clutch bellhousing have a buddy help you try test fitting input shaft of trans into pilot bushing to see if it still fite post insl;aloing bushing in crank.
I learned this the hard way the 1st time this happened to me a few yrs back.
If it fit's great, but if not it takes litterally 4-5 mins or less to carefully remove enough meterial from the ID of bushing to allow input shaft to properly seat,snug but not too tight all done prior to istalling the flywheel/clutch/bellhousing/and motor in car to find it's an issue.
If you dont test fit you run the risk of getting the motor in car and trans not going in all the way due to thisd issdue having to remove trans/bellhosuing/clutch/flywheel just to take 5 mins to remove enough metrial from bushing to asllow trans to fully/proerly seat.
BTW,i used stock pilot bushings from Doorman/Lakewood/Hayes/Carquest/etc,who knows if they all came from the same mfg or not.
They all looked a little different in color-texture from eachother but all had same non fitment issue post install in every casse weather it be sbc or bbc with muncie trans.
Let us know how it goes.
1969 CHEVELLE SS396,ORIGINAL #'S MATCH,GOT IN 1978,(In 2001 rblt/bored original 396 .030 to 402)/M20/12BOLT/3:31'S
2002 MAXIMA (DAILY DRIVER/1 owner,GOT 3/2013 w-44k miles)
2009 HD ELECTRAGLIDE CLASSIC ULTRA (GOT 11/14 W-9,700 miles)
Last edited by SWHEATON; Dec 18th, 10 at 12:36 AM.