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Wedge proper torque for TR7 cylinder head
- Thread starter srmorse
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Mark Beiser
Jedi Trainee
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My Haynes manual and my "The Complete Official Triumph TR7" book both list it as 50 lbs.
Mark B.is right,i just look this up in my triumph technical service bulletins.
the tech service bulletin came out in 79 revising the torque from 55lbs/ft to 50lbs/ft.
also in this tech bulletin it also revised the head tightening sequence.
Cliff Davis
78 fhc soon to have sprint motor conversion.
79 fhc
the tech service bulletin came out in 79 revising the torque from 55lbs/ft to 50lbs/ft.
also in this tech bulletin it also revised the head tightening sequence.
Cliff Davis
78 fhc soon to have sprint motor conversion.
79 fhc
I'm intersted in this too -- though after the fact. I installed my head in the spring @ 55 lbs.
Haynes, I recall, suggested the familiar criss-cross tightening sequence you see on most heads that bolt down directly. Other manuals had 3 cycles 20 -> 35 -> 55 lbs doing *first* the studs along the 'top' side nearest the inlet manifold and then the 'bottom' bolts along the exhaust manifold side.
In the end I concluded that the Haynes authors had been in a hurry and simply copied an old method used on most other cars. I went with the seemingly odd method suggested in the BL manual on the ground that it made perverse sense of how best to tighten those slanted fastners.
So far so good ....
Haynes, I recall, suggested the familiar criss-cross tightening sequence you see on most heads that bolt down directly. Other manuals had 3 cycles 20 -> 35 -> 55 lbs doing *first* the studs along the 'top' side nearest the inlet manifold and then the 'bottom' bolts along the exhaust manifold side.
In the end I concluded that the Haynes authors had been in a hurry and simply copied an old method used on most other cars. I went with the seemingly odd method suggested in the BL manual on the ground that it made perverse sense of how best to tighten those slanted fastners.
So far so good ....
Started at 55 lbs on mine and increased it at each retorqueing 'til I was certain it had seated and sealed. Now at 70 lbs and doing well. Have heard of others at 80 plus lbs. Don't try this without the good ARP bolts and studs though. I know you guys are going to jump me for this and I deserve whatever dirision you direct, but it's the truth and I'll swear to it.
ObiRichKanobi
Jedi Warrior
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<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr> is there an place on this site to post the tech bulletin, so all can see <hr></blockquote>
Under the links button, there's a tech tips. I'm not sure that it supports graphics tho....
Under the links button, there's a tech tips. I'm not sure that it supports graphics tho....