David Jenkins
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| posted on 8/7/02 at 08:08 AM |
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Quick info needed
Can anyone tell me the thread type commonly used on crossflows?
I want to bolt my gearbox/bellhousing to the engine block, but I've only got the metric bolts that came with the Sierra box and the Xflow is
Imperial.
I have some studding that fits the block and that's 3/8" dia, but I have no idea whether it's BSW, UNC or Unified Cycle Gas Thread 
I'm guessing that it's going to be UNC, but advice would be appreciated.
It's only the 2 top bolts that screw into the block - the rest are through holes which could be done with M8's without pain.
cheers,
David
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interestedparty
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| posted on 8/7/02 at 09:12 AM |
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For vitually all the components that interest us there are only three types of thread that you are likely to come across-metric, unc or unf. Generally
unf (fine) are used when bolting into steel, and unc (coarse) when bolting into softer material such as aluminium eg rover v8 engines. Metric is
usually inbetween. If the studding you have is 3/8 then look at the thread. Is it finer than metric then it will be unf.If not, then unc.
John
PS a Zeus book and a thread gauge (ask at the bolt and nut shop) are very useful
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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David Jenkins
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| posted on 8/7/02 at 09:51 AM |
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Many thanks!
It's what I suspected - the thread looks identical to the M8, so I reckon it's UNC.
These threads are going into the iron block, so this seems right as well.
cheers,
David
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marcjagman
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| posted on 12/7/02 at 10:54 PM |
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Take it to a hardware shop (B&Q?) they'll be able to tell what the thread is and supply you with new bolts for about 30p each.
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interestedparty
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| posted on 13/7/02 at 01:15 AM |
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I would go to a proper bolt and nut stockist, there's at least one in most cities. You are unlikely to find unc at a B&Q. Even if you did it would be
a basic quality version
John
PS Don't forget the Zeus book and thread gauge
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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David Jenkins
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| posted on 13/7/02 at 06:48 PM |
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All sorted - got them from Namrick.
I also managed to work out the bolts I really needed - 2 of 3/8" UNC to go from gearbox flange to the engine, and M10s for all the rest (they go from
the engine to metric holes in the Sierra gearbox.
cheers,
David
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Jon Ison
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| posted on 14/7/02 at 06:04 PM |
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why not drill n tap em all out to a suitable metric size ?
much cheaper.......
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David Jenkins
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| posted on 15/7/02 at 08:08 AM |
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Already got 'em from Namrick!
Gearbox fitted to block, and everything into the chassis.
I now have room in my garage, as the engine hoist and stand have been folder away for a while.
David
P.S. If I could get this site's photo archive upload to work, I'd post some pictures! 
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Jon Ison
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| posted on 15/7/02 at 09:09 PM |
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same here, still can't upload pics.......
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