Author Topic: Torque specs for cylinder heads?  (Read 488 times)

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Offline 66DT175

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Torque specs for cylinder heads?
« on: October 25, 2017, 07:30:19 AM »
Am replacing head gaskets, anyone know torque specs for the 175 DT? Thank you.

Offline dcr

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Re: Torque specs for cylinder heads?
« Reply #1 on: October 25, 2017, 08:28:41 AM »
Here is a really good tip for head gaskets. This is from the 350 section, but is most likely applicable to the 175. It certainly worked for me.

http://bridgestonemotorcycleparts.com/index.php?topic=4592.0

Just reuse the copper gaskets.  Heat them with a torch until red hot to anneal (soften) them, but not hot enough to melt.  Put a light coat of copper gasket cement on both sides.  I use the spray gasket sealer and lay them out on a paper towel and give them a light spray, flip them and spray the other side.  Put them and the heads back on and torque the nuts to 18-21 ft. lb.

Checking the heads to make certain they are reasonably flat first is a good idea. A good straightedge will work as a check, although rubbing the head on a sheet of 280-400 grit wet-or-dry paper on a sheet of glass or a nice flat workbench will tell you a lot, also, and you can use that to true them up if needed.
1966 175 DT and 1968 350 GTR

Offline OldSwartout

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Re: Torque specs for cylinder heads?
« Reply #2 on: October 25, 2017, 08:33:34 AM »
140 in/lb

From P. 80 of theBS 50-175 Service Manual downloadable from this site.  Takes a while to find it.  :)
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline 66DT175

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Re: Torque specs for cylinder heads?
« Reply #3 on: October 25, 2017, 05:29:08 PM »
Thank you.

 


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