[E-Type] Non E Type :Bi metallic washer beneath Cylinder Head Stud Nut

My son is rebuilding a Honda motorcycle engine and is re-installing
the cylinder head on a 0.950 Litre engine. The cylinder head is
held down with nuts on each stud. Beneath each nut is a washer made
out of two layers of metal one copper and the other steel.To re-use
these I presume they should be re-softened by heating to red and
water quenching. Which way round to use the washer? Copper surface
to the Al block, and steel toward the nut. I am just guessing. Does
anyone know??TIA,–
John M Holmes 1973 E Type SIII Supra 5-Speed, 1970 SII OTS
Sarnia, Ontario, Canada
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Question from : John M Holmes 1973 E Type SIII Supra 5-Speed, 1970 SII OTS
Sarnia, Ontario, Canada

John,

I would suggest that you buy new washers if possible. Wouldn’t think they
would cost that much, and would be good insurance. Also suspect that they
would be installed copper side to the head, steel to the nuts. (If they
were copper to the nuts, the nut’s would gouge the copper as you tightened
them to final torque setting.)

Walt
71 V12 2+2

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In reply to a message from John M Holmes sent Mon 28 Mar 2005:

Sorry John - no idea. Last big Honda I worked on was the CB750…

Hondas do often use stud holes as oil passages though, so I’d guess
this bimetallic design (which I’ve never come across) would use the
softer side as the sealing side and the harder side as the washer
side, as has been suggested.

So, that would be 950cc and around 120 bhp if it’s an older one (as
opposed to around 150+ bhp from a late model if it was a sport
bike?). Which would make our circa 4 litre E-types up around the
500-600 bhp range if they performed pro-rata, yes?

As for bhp per ton instead of bhp per litre, the bikes come out
even better I guess.–
Peter Crespin 94 X300 Daimler / 66 2+2 ‘E’
Buxton, United Kingdom
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In reply to a message from John M Holmes sent Mon 28 Mar 2005:

John -
As Peter said its a cam oil feed passage. Verify lots of oil to the
cam area upon starting. Copper side down, smooth mating surface as
the guys said.–
David Ahlers
Skaneateles, NY, United States
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