Intake manifold torque question

Silver2ssA8 · 03-20-2019, 10:52 PM

Just installed a ported intake manifold and throttle body, did the work last night and used blue thread locker. I torqued the manifold in sequence and in stages with the motor cold and then took it for a spin. I came back and let it sit for 30 minutes and rechecked torque, I got a few turns out of each bolt to reach 89 inch pounds again. Is it bad to torque the manifold with a hot motor or could they really back out in a couple miles?
Thanks for the help!

Ventmaster · 03-25-2019, 11:36 AM

Here's my best guess: the thread locker had not hardened before your drive and the heat reduced its viscosity even more- to the point it acted a bit like a lubricant, decreasing the resistance/friction on the threads. This allowed you a few more turns while still staying in "spec".

If you don't get a CEL next start up, you're probably a bit tight but O.K.

03-20-2019, 10:52 PM	#1
Silver2ssA8 Drives: 2017 Silver SS Join Date: Dec 2017 Location: Valley springs CA Posts: 104	Intake manifold torque question Just installed a ported intake manifold and throttle body, did the work last night and used blue thread locker. I torqued the manifold in sequence and in stages with the motor cold and then took it for a spin. I came back and let it sit for 30 minutes and rechecked torque, I got a few turns out of each bolt to reach 89 inch pounds again. Is it bad to torque the manifold with a hot motor or could they really back out in a couple miles? Thanks for the help!

03-25-2019, 11:36 AM	#2
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 2,889	Here's my best guess: the thread locker had not hardened before your drive and the heat reduced its viscosity even more- to the point it acted a bit like a lubricant, decreasing the resistance/friction on the threads. This allowed you a few more turns while still staying in "spec". If you don't get a CEL next start up, you're probably a bit tight but O.K.

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