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AutoTechGuy, Auto Service Technician
Category: Car
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Experience:  ASE Master Tech, ASE Advanced engine performance
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2000 Olds Intrigue: head gaskets with new bolts..Service Manual

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I replaced the head gaskets with new bolts on my 2000 Olds Intrigue. The GM Service Manual has 3 contradicting torque sequences in different sections of the manual. I first torqued to 30 Nm + 60 deg. Then 2 more 60 deg sequences for a total of 180 deg. Then I saw the contradicting values in other sections. I assumed the table in the front of the engine section is correct ( 40 Nm + 60 deg, 60 deg, 80 deg). So I did another sequence of 20 deg. Should I do another sequence to account for the difference between 30 Nm and 40 Nm?. If so, how many deg?
Submitted: 8 years ago.
Category: Car
Expert:  AutoTechGuy replied 8 years ago.
Hi Charlie, thank you for trusting us with your problem.

Here is the proper torque specification and sequence:
M11 Bolts-
Step one: 30 ft/lbs (40 n.m)
Step two: Additional 100 deg.
Step three: Additional 100 deg.

After the M11 bolts have been torqued then:
Tighten the long M6 bolt to 106 inch pounds (12 n.m)
Tighten the short M6 bolts to 106 inch pounds (12 n.m)

Because you have already tightened the M11 bolts you should replace them and the head gaskets again. I realize this is an additional expense that you should not have to pay. However, you do not want to put it all back together and have a problem soon afterwards.

Sorry for the bad news. Please let me know if you need any more help!
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