Bridgestone Motorcycle Parts Discussion Board

Bridgestone Tech Talk => 175 & 200 Talk => Topic started by: 66DT175 on October 25, 2017, 07:30:19 AM

Title: Torque specs for cylinder heads?
Post by: 66DT175 on October 25, 2017, 07:30:19 AM

Am replacing head gaskets, anyone know torque specs for the 175 DT? Thank you.

Title: Re: Torque specs for cylinder heads?
Post by: dcr 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.

Title: Re: Torque specs for cylinder heads?
Post by: OldSwartout 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.  :)

Title: Re: Torque specs for cylinder heads?
Post by: 66DT175 on October 25, 2017, 05:29:08 PM

Thank you.