Re: crack in block between dowel pin&trans bolt
[Re: dogdays]
#1785797
03/23/15 03:45 PM
03/23/15 03:45 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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Since the crack extends into the threads it's possible that the threaded hole will open up a little when the bolt is torqued, I'd install a Heli-coil in the threaded hole and run it.
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Re: crack in block between dowel pin&trans bolt
[Re: dogdays]
#1785798
03/23/15 03:51 PM
03/23/15 03:51 PM
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Joined: Jun 2003
Posts: 21,761 It's a dry heat
gtx6970
Too Many Posts
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Too Many Posts
Joined: Jun 2003
Posts: 21,761
It's a dry heat
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Quote:
Mark this day on your calendars, guys! Today I actually agree with Stanton. The dowels are there to get the transmission centered on assembly.
Use it, no fixing required. Be sure to torque the bellhousing bolts to spec.
R.
Sorry, But I disagree. IMO of the pins only purpose was hold it while its bolted up,,why not use roll or spring pins?
IMO, 1st - the pin align the trans to the engine 2nd - they prevent the case from rotating or moving in any way to prevent braking parts.
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Re: crack in block between dowel pin&trans bolt
[Re: gtx6970]
#1785799
03/23/15 04:09 PM
03/23/15 04:09 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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The dowel is a critical part not only for alignment but also for torque restraint...ever see those GM one-size-fits-all thin plate adapters to swap transmissions...the dowels and two bolts are that are used for torque restraint?
The INTERNET, the MISinformation superhighway
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Re: crack in block between dowel pin&trans bolt
[Re: gtx6970]
#1785800
03/23/15 04:30 PM
03/23/15 04:30 PM
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Joined: Oct 2005
Posts: 9,031 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,031
Ontario, Canada
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Quote:
why not use roll or spring pins
Because they probably cost the factory more than a dowel did.
Aftermarket ... when's the last time you saw a roll pin with an offset ?!?!?
In reality, a roll pin could probably be safely used. They're spring steel so they're plenty strong. They are in a "shear" situation so could probably easily take the stress although I don't believe there is any.
If all the bolts on the trans to engine are tight, the trans is held in alignment primarily through the friction of the two mating surfaces - that friction created by the torque of the aforementioned bolts. The pins provide minimal support (if any) once the trans is bolted up.
Argue it all you want, this is my opinion and I'm sticking to it.
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