Official torque specs thread
#136
CR: Connecting Rod.
I wrote Cosworth and they do not supply any value, unbelievable!.. I guess manufacturer settings is a good start.
Cheers!
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MinusPrevious (Sep 11, 2016)
#138
EvoM Guru
iTrader: (1)
Do not use the OEM connecting rod bolt torque spec on your cosworth rods. It will not work.
Also, if you bought main studs, do not use the torque specs for the OEM bolts.
The OEM bolts are torque to yield bolts. Hence the torque spec is XXft-lbs then an additional 90*. The manufacturer has to do a good amount of testing (with the bolt and the assembly) to come with a torque spec like that.
I find it quite deplorable that cosworth doesn't have torque specs for their parts. Do the heads of the rod bolts have markings on them?
Also, if you bought main studs, do not use the torque specs for the OEM bolts.
The OEM bolts are torque to yield bolts. Hence the torque spec is XXft-lbs then an additional 90*. The manufacturer has to do a good amount of testing (with the bolt and the assembly) to come with a torque spec like that.
I find it quite deplorable that cosworth doesn't have torque specs for their parts. Do the heads of the rod bolts have markings on them?
#140
Evolved Member
iTrader: (5)
Does anyone know if there is a torque spec for the oil passage plug on the back of the cylinder head just above the EGR port? Please see pic below for reference. I've skimmed the service manual, and tried a few searches here, but haven't had any luck finding the specifics on this little guy.
Thanks!
Thanks!
#141
EvoM Guru
iTrader: (1)
It's pipe thread. Put thread sealant on it, and snug it up. It's not going to go anywhere, the threads are tapered, it basically wedges itself in place.
#147
Evolved Member
iTrader: (27)
Difference in torque specs in the repair manual. I circled the fasteners in question.
The m8 manifold bolts are 22+-2 ft/lb on one, 24+-4 on other. M10 nuts 36+-4 on one, 41+-6 other. Not huge diff there.
Manifold to turbo bolts and nuts are 38+-3 one, 47+-3 the other, however Nm is the same at 64+-5 Nm. 64 Nm is 47 ft/lb.
I’m thinking the greater of the figures is the correct one as the fsm manifold torque sequence references the greater numbers also. Although 47ft/lb on the turbo bolts seems a little high, I always did around 40 I thought..
The m8 manifold bolts are 22+-2 ft/lb on one, 24+-4 on other. M10 nuts 36+-4 on one, 41+-6 other. Not huge diff there.
Manifold to turbo bolts and nuts are 38+-3 one, 47+-3 the other, however Nm is the same at 64+-5 Nm. 64 Nm is 47 ft/lb.
I’m thinking the greater of the figures is the correct one as the fsm manifold torque sequence references the greater numbers also. Although 47ft/lb on the turbo bolts seems a little high, I always did around 40 I thought..
#148
EvoM Guru
iTrader: (1)
You can't really "torque" the smaller manifold to head bolts with most aftermarket manifolds, so I just guess at 25ftlbs on those. The big ones on the manifold get 40ftlb. And on the stock frame stuff where I can use a torque wrong on the turbo to manifold bolts/studs, I do 48ftlb. Or in the case of basically any aftermarket mani, even stock frame stuff, they just get made tight because theres no torqueing them.
#149
Evolved Member
iTrader: (27)
You can't really "torque" the smaller manifold to head bolts with most aftermarket manifolds, so I just guess at 25ftlbs on those. The big ones on the manifold get 40ftlb. And on the stock frame stuff where I can use a torque wrong on the turbo to manifold bolts/studs, I do 48ftlb. Or in the case of basically any aftermarket mani, even stock frame stuff, they just get made tight because theres no torqueing them.
#150
Newbie
Hey guys, I didn’t see it on here but I need the torque spec for the alternator pulley, I’m replacing mine with an Stm 10% under drive. Also if anyone has a good technique on how to hold the oem pulley so I can remove the nut that would he awesome