Stock Bell housing Ever Need Realignment?
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
Stock Bell housing Ever Need Realignment?
Has anybody with a born with engine, bell housing and trans ever had one out of spec? I am going to drop the trans (again) for another purpose and have not performed this check. I'd like to avoid pulling the pressure plate and disk off, but if there is a compelling reason to check the spec, then maybe I would.
The reason I have not performed this check during previous trans drops is because this is all original equipment, car shifts extremely well and the pilot bushing was not worn when I removed the old one.
Sammy
The reason I have not performed this check during previous trans drops is because this is all original equipment, car shifts extremely well and the pilot bushing was not worn when I removed the old one.
Sammy
Race Director
Joined: Nov 2006
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From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
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I don't really know myself Sammy. I have a 77 with original engine and trans. I've had the trans out twice in the 30 plus years I've owned her. Like you everything is working fine. So I guess, Why fix what ain't broke!
Melting Slicks
Joined: Nov 2006
Posts: 3,415
Likes: 1,824
From: Apple Valley, MN
Assuming you have a trusty Muncie and it has been behaving well, no worries. On the other hand, if you are putting in a Tremec, you need to dial it in, no matter how long it has been in as the Tremecs don’t play well with a non-concentric connection.
Burning Brakes
Joined: Jun 2010
Posts: 1,165
Likes: 93
From: Bellmore NY
When I blew up my clutch on my first night out, back in 2010, my buddy and I did the job in his garage.
he recommended doing a concentric test, and the factory bell housing was out of spec. We used the Lakewood offset dowels.
just a guess but I bet alot of them are off, but the Muncie will egg out the pilot bushing and still work anyway. Clutch goes, change bushing and the circle of life continues.
he recommended doing a concentric test, and the factory bell housing was out of spec. We used the Lakewood offset dowels.
just a guess but I bet alot of them are off, but the Muncie will egg out the pilot bushing and still work anyway. Clutch goes, change bushing and the circle of life continues.
Old Fart Pilot
Joined: Apr 2010
Posts: 1,921
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From: Spokane, WA
I didn't even know such a check was needed much less might actually be required... I subsequently found out it is required for newer transmissions like the Tremec and they have fairly tight specs (expecially for high performance installs). Is it required for for a M20 mated to a pretty basic 300ishHP motor in a non-racing environment? If so, what are those parallel and concentric specs??
Thanks,
paul
Thanks,
paul
Melting Slicks
Joined: Dec 2009
Posts: 3,233
Likes: 657
From: Thunder Bay
I didn't even know such a check was needed much less might actually be required... I subsequently found out it is required for newer transmissions like the Tremec and they have fairly tight specs (expecially for high performance installs). Is it required for for a M20 mated to a pretty basic 300ishHP motor in a non-racing environment? If so, what are those parallel and concentric specs??
Thanks,
paul
Thanks,
paul
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
I didn't even know such a check was needed much less might actually be required... I subsequently found out it is required for newer transmissions like the Tremec and they have fairly tight specs (expecially for high performance installs). Is it required for for a M20 mated to a pretty basic 300ishHP motor in a non-racing environment? If so, what are those parallel and concentric specs??
Thanks,
paul
Thanks,
paul
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I bent the arm on my magnetic base for dial indicator. You think about offset dowels as cam lobes. I recommend the long allen locking type of offset dowels. You install them the same direction and move them in conjunction. So if you have .007 offset and they are both at 12 o'clock. You are raising the bell housing .007. If you rotate them both to 3 o'clock you have moved it right .007
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
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From: Spokane, WA
Melting Slicks
Joined: Dec 2009
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From: Thunder Bay
You should probably wait until you have completed the measurement. .007" may not be the size you need.
Team Owner
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From: Reno Nevada
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