Bell Housing dial in - Chevelle Tech
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post #1 of 17 (permalink) Old Aug 25th, 14, 12:33 AM Thread Starter
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Cory
 
Join Date: Mar 2011
Location: Wimberley, TX (SW of Austin)
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Bell Housing dial in

This is no fun at all doing by yer lonesome. Especially since it was .023 out from perfect and I only had .007 offset dowels. At least I had the motor out and and on hoist and blocks.

That's what happens after line honing the block I suppose. The offset was such that I needed to raise the housing strait up.

Long story short, I ended up with a 7/16-20 shoulder bolt drilled and tapped through the Lakewood Housing into the top block bell housing boss.

After blocking and shimming the housing up from the bottom I was able to get it dialed in at .001 and drilled a pilot hole followed by the the proper bit for tapping.

Buttoned it all up and I got lucky. The .001 didn't change.

The story ain't over. I ordered the .021 offset dowels from http://www.robbmcperformance.com/products/dowels.html
which are much better than the .007 style that I had.

A 2 hour job crammed into 12...and I still have to redo the whole thing after the new offset dowels get here.

BTW - GREAT CUSTOMER SERVICE FROM robbmcperformance.com and on SUNDAY , NO LESS.

.

'66 SS 396 #'s match/ POP - Aztec Bronze / Bronze Interior
'66 Malibu 454 Cortez Silver / Maroon Interior
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post #2 of 17 (permalink) Old Aug 25th, 14, 7:41 AM
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Jody
 
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Re: Bell Housing dial in

You do realize that a bellhousing needs a parallel alignment check too. The parallel alignment check/repair must be done first as it will change the actual concentric alignment reading.

Jody Haag
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post #3 of 17 (permalink) Old Aug 25th, 14, 7:50 AM Thread Starter
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Cory
 
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Re: Bell Housing dial in

Thanks,

I haven't seen the parallel spec tolerance or the method to measure it.

Do you have the specs or a link to them?

How do I correct it if out of tolerance? Machine shop?

.

'66 SS 396 #'s match/ POP - Aztec Bronze / Bronze Interior
'66 Malibu 454 Cortez Silver / Maroon Interior
'37 Chevy Coupe 235 Straight 6 - Cabana Cream`
'55 Chevy Gasser - 427, 4 speed
'72 Cutlass Supreme - Gold/White
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post #4 of 17 (permalink) Old Aug 25th, 14, 9:50 AM
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Jody
 
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Re: Bell Housing dial in

Here is a picture reference for checking the parallel alignment. Parallel alignment is corrected by installing shims between the bellhousing and engine block.

Standard Automotive Bellhousing Alignment Specifications:
Concentric: +/-.005 or .010 TIR
Parallel: +/-.001 or .002 TIR

Hi-Performance 7,500+ RPM Bellhousing Alignment Specifications:
Concentric: +/-.0025 or .005 TIR
Parallel: +/-.0005 or .001 TIR
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Jody Haag
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post #5 of 17 (permalink) Old Aug 25th, 14, 10:26 AM Thread Starter
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Cory
 
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Re: Bell Housing dial in

Thanks Jody. It's a great confidence builder to be able to nail these specs down and achieve them on my projects.

From the pic it appears that the mag base is mounted on the flywheel which is rotated do perform the check just outside the opening in the bell.

.

'66 SS 396 #'s match/ POP - Aztec Bronze / Bronze Interior
'66 Malibu 454 Cortez Silver / Maroon Interior
'37 Chevy Coupe 235 Straight 6 - Cabana Cream`
'55 Chevy Gasser - 427, 4 speed
'72 Cutlass Supreme - Gold/White
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post #6 of 17 (permalink) Old Aug 25th, 14, 7:28 PM
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Jody
 
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Re: Bell Housing dial in

Here is a 5 page bellhousing alignment procedure I wrote up for the Legend700 transmission warranty. Anyone can print these 5 pages and use them for any manual transmission install.
Attached Files
File Type: pdf JodyLGTAlignment01.pdf (189.9 KB, 662 views)
File Type: pdf JodyAlignment02.pdf (8.5 KB, 593 views)
File Type: pdf JodyAlignment03.pdf (102.6 KB, 496 views)
File Type: pdf JodyAlignment04.pdf (182.4 KB, 428 views)
File Type: pdf JodyAlignment05.pdf (104.6 KB, 408 views)

Jody Haag
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post #7 of 17 (permalink) Old Aug 26th, 14, 1:36 AM
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Tom Terrific II
 
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Re: Bell Housing dial in

Jody, this is excellent. Thanks for taking time. Stuck to the top.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #8 of 17 (permalink) Old Aug 26th, 14, 7:52 AM
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Jody
 
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Re: Bell Housing dial in

Tom, Thanks for making this a sticky.

Bellhousing alignment is probably the most over looked procedure.

I am here if anyone has any questions..........

Jody Haag
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post #9 of 17 (permalink) Old Aug 26th, 14, 5:34 PM
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Re: Bell Housing dial in

where do you get the shims for the parallel alignment? Are they store bought?

66 SS-396/425 - M22 -3:73 -12 bolt
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post #10 of 17 (permalink) Old Aug 26th, 14, 5:38 PM
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Re: Bell Housing dial in

You can get shims from Granger or other industrial supply houses. Ask for "A" shims.
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post #11 of 17 (permalink) Old Aug 26th, 14, 9:08 PM
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Jody
 
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Re: Bell Housing dial in

Yes, Grainger or MSC Direct will have the needed shims. Here is a reference picture of what I use. The correct shim size you need will have a 3/8" bolt slot and I suggest you buy .001" through .010".
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Jody Haag
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post #12 of 17 (permalink) Old Oct 20th, 14, 5:07 PM
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Michael
 
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Re: Bell Housing dial in

Am I missing something. Never thought about alignment issues. What could arrise from misalignment?
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post #13 of 17 (permalink) Old Nov 21st, 14, 4:49 AM
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Greg
 
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Re: Bell Housing dial in

lots of things! premature clutch failure, excessive pilot bear wear, ruined trans input bearing, difficulty shifting under load, vibration, and broken transmission case. ever seen a trans at a swap meet with the ears broken off? this is why.

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post #14 of 17 (permalink) Old Dec 4th, 15, 12:44 PM
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Jeff
 
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Re: Bell Housing dial in

Hey Fellas,
I have a Saginaw 4 Speed and I am looking at a T-56 , 6 speed. My question ...is what bell housing will be required for a 350 SB? I have already changed over to a McLeod Hydraulic Clutch System
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post #15 of 17 (permalink) Old Feb 2nd, 16, 3:25 PM
 
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Re: Bell Housing dial in

What will happen if the bell housing is not aligned. Can this cause a shuddering type vibration in the driveline
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