torque values for cylinder head bolts
#3
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What head bolt/stud torque do you recommend when using an MLS gasket?
Cometic: When using MLS head gaskets always refer to the manufacturer of the fastener to determine accurate torque values. Appropriate torque is critical when installing new gaskets of any kind.
Cometic: When using MLS head gaskets always refer to the manufacturer of the fastener to determine accurate torque values. Appropriate torque is critical when installing new gaskets of any kind.
Last edited by Andy from Sandy; 08-16-2019 at 08:29 AM.
#4
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Lightly coat threads, underside of flange and bottom face
of cylinder head bolts in clean Harley-Davidson 20W50
engine oil. Wipe off excess oil.
Start cylinder head bolts onto cylinder studs, two
short bolts on left side of engine, two long bolts on right.
Tighten all bolts only finger tight at this time.
The procedure for tightening the head screws is critical to
proper distribution of pressure over gasket area. It prevents
gasket leaks, stud failure, and head and cylinder distortion.
For each cylinder head, start with bolt
numbered one, as shown. In increasing numerical
sequence, tighten head bolts in the following
steps:
a. Tighten each bolt to 96-120 in-lbs (11-14 Nm).
b. Tighten each bolt to 13-15 ft-lbs (18-20 Nm).
c. Loosen all bolts.
After head bolts are loosened from initial torque, tighten
bolts in three stages. Tighten in increasing numerical
sequence as follows:
a. Tighten each bolt to 96-120 in-lbs (11-14 Nm).
b. Tighten each bolt to 13-15 ft-lbs (18-20 Nm).
c. Mark cylinder head and head bolt
shoulder with a reference line.
d. Tighten each bolt an additional 85°-95°.
Last edited by Andy from Sandy; 08-16-2019 at 08:31 AM.
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maduncan75 (12-17-2022)
#5
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Right from Hammers web site. Ive used this many times with no issues.
Lube the threads, shanks, and undersides of the heads on the head bolts and install finger tight. Torque in the order shown in your service manual. For multi-layer steel gaskets, torque all head bolts to 9ft-lbs, then 14, 22, 35, and finally 42ft-lbs. For composition type gaskets, follow the procedure described in the manual.
Lube the threads, shanks, and undersides of the heads on the head bolts and install finger tight. Torque in the order shown in your service manual. For multi-layer steel gaskets, torque all head bolts to 9ft-lbs, then 14, 22, 35, and finally 42ft-lbs. For composition type gaskets, follow the procedure described in the manual.
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