cosworth cylinder head??
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Joined: Oct 2006
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cosworth cylinder head??
Hello,does anyone know about tighten cosworth cylinder head with metalic gasket and ARP studs? how many NW must be? thanks a lot.
1) To ensure proper thread engaement and accurate torque readings,
clean and re - tap, if necessary, ALL threads in the block.
2) Clean and insoect all hardware proir to installation. Look for obvious
defects or shipping damages, plus proper fit, length and dimension.
3) a. If cylinder head studs protude into water jacket, lubricate the block
threads of the studs with ARP THREAD SEALER.
b. If cylinder head studs protrude into blind hole, lubricate the threads,
nuts and washers with ARP THREAD LUBRICANT or 30wt oil.
c. Screw studs into block "HAND TIGHT ONLY" .
NOTE: LOCTITE MAY BE USEED IF A PERMANENT MOUNTING OF THE
STUDS IS PREFERRED. THE FASTENERS, HOWEVER MUST BE
TORQUED PRIOR TO THE LOCTITE SETTING UP.
4) Intsall cylinder heads and check for binding or misalignment.
5) ARP recommends using the ARP MOLY LUBRICANT or at the very least,
a good quality Moly Lubricant as opposed to motor oil. this is due to
higher friction on the studs aswell as inconsistances in the clamping
force of the fastners when moto oil ( or low quality lubricant) is used.
PRELOAD (TORQUE) RECOMMENDATIONS:
Torque values are based on 75% of fastners yield strength. Use the manufactuers torque sequence but do not use the engine manufacturers torque specs.
Torque the nuts to 81ft lbs for ARP MOLY ASSEMBLY LUBRICANT
( or thread sealer) or torque to 105 ft lbs with 30 wt motor oil.
clean and re - tap, if necessary, ALL threads in the block.
2) Clean and insoect all hardware proir to installation. Look for obvious
defects or shipping damages, plus proper fit, length and dimension.
3) a. If cylinder head studs protude into water jacket, lubricate the block
threads of the studs with ARP THREAD SEALER.
b. If cylinder head studs protrude into blind hole, lubricate the threads,
nuts and washers with ARP THREAD LUBRICANT or 30wt oil.
c. Screw studs into block "HAND TIGHT ONLY" .
NOTE: LOCTITE MAY BE USEED IF A PERMANENT MOUNTING OF THE
STUDS IS PREFERRED. THE FASTENERS, HOWEVER MUST BE
TORQUED PRIOR TO THE LOCTITE SETTING UP.
4) Intsall cylinder heads and check for binding or misalignment.
5) ARP recommends using the ARP MOLY LUBRICANT or at the very least,
a good quality Moly Lubricant as opposed to motor oil. this is due to
higher friction on the studs aswell as inconsistances in the clamping
force of the fastners when moto oil ( or low quality lubricant) is used.
PRELOAD (TORQUE) RECOMMENDATIONS:
Torque values are based on 75% of fastners yield strength. Use the manufactuers torque sequence but do not use the engine manufacturers torque specs.
Torque the nuts to 81ft lbs for ARP MOLY ASSEMBLY LUBRICANT
( or thread sealer) or torque to 105 ft lbs with 30 wt motor oil.
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Joined: Jul 2006
Posts: 24,596
Likes: 4
From: uk
This is just how I do mine, 60lbft, 90lbft, 120lbft, that's me anyway, in normal tightening sequence, on a group a gasket though and on these rest the gasket then retighten after some 2 hours minimum.
tabetha
tabetha
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