Flywheel Housing-to-Crankcase Measurements

Posted by Gordon Biggar on April 17, 1998 at 22:58:14

Here we go again!

After getting the transmission back into the car and the engine assembled, I thought that it would be all downhill from here.I am aware that the specs call for a variation of no greater than .006" when aligning the flywheel housing with the face of the crank flange.Below I have listed some of the measurements that I have taken, using a mag base and a dial indicator.

My initial read is that I must have a slightly(?) warped housing, because I am able to narrow the measurement differentials only to a certain degree.Some of you may look at the readings and say that it is no big deal.("Spare" flywheel housings -- without cracks -- are not in overabundance in this part of Texas from what I hear.)

Is any one of the readings below "acceptable?"
Should I try re-surfacing both sides of the flywheel housing, as if I was re-surfacing a cylinder head?I have never seen this suggested in any of the overhaul literature that I have read.

In the numbers below, I am looking at the housing from the rear.The "L" and "R" refer to the left and right, respectively, bolt holes to the block for the accelerator linkage.The "9/3" refers to the two housing-to-block attaching bolts (of the four) at 9pm and 3 pm.Obviously, the measurements refer to the total shim thicknesses used during any set of measurements.The "12" through "3" refer to the measurements taken at 12 o'clock, six o'clock, etc., given the shims in place at L,R and 3/9.Comprenez-vous?As you can tell, the dial indicator was zeroed at 12 o'clock.

L R 9/312 9 6 3

.020.0300/0 0 +.001 +.002 -.014

.020.0300/.0050 +.0025+.0045-.012

.010.0300/.0100 -.002 +.014 0

.015.0350/.0100 -.013 +.005 0


Hopefully, the above will print in an easily readable format.Any thoughts are welcome (where have you heard that before?).I was hoping to get this cutie cranked up by the end of this month...

Regards to all, and thanks for your past help.

Maybe I will see some of you at PATE?

Gordon Biggar


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