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Mike S.
Mike S., Classic Car Mechanic
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Chrysler Newport: What is the correct torque for exhaust pipe

Customer Question

What is the correct torque for exhaust pipe flange bolts?

I just replaced the flange gaskets on both pipes that join to the exhaust manifold. I tightened them "snug" (probably 50-60 ft lb.) One of them is leaking, and not sure if it's from over- or under-tightening.

Also, if I have over-tightened, must I replace the gasket?
Submitted: 11 months ago.
Category: Classic Car
Expert:  Mike S. replied 11 months ago.

Are they gaskets or like donuts. 50-60 ft lbs sounds like alot to me but I will try to find a spec on that.

Customer: replied 11 months ago.

Flange gasket with 2 bolts -- like this one.

Expert:  Mike S. replied 11 months ago.

1966 Chrysler Newport 8 Cylinders 6.3L 2BL

tighten exhaust pipe bolts to 40 ft. lbs

I see it is a gasket type. I would remove the gasket and check it, if there are studs and nuts, run a die up each stud and clean up the treads and use new nuts, then make sure you tighten them up evenly.

Expert:  Mike S. replied 11 months ago.
Bolts? Then use new bolts.
Expert:  Mike S. replied 11 months ago.
And run a tap down through the bolt hole.
Customer: replied 11 months ago.

Sorry -- what's the tap through the bolt hole for? Just to clean it out?

Expert:  Mike S. replied 11 months ago.
Yes.
Customer: replied 11 months ago.

Then are these holes normally threaded? The bolts that were on there -- and the replacement bolts that I have -- just slip through the holes on the flange -- they're not threaded in. (I didn't notice any threads in the hole but wasn't looking for them either, since the bolt just slipped out.)

Expert:  Mike S. replied 11 months ago.
Then how did you torque them to 50 ft lbs while holding a nut, too?
Expert:  Mike S. replied 11 months ago.
I would look closely for any signs of a thread in them holes. Since they are so old, they may have been striped several times and someone could have actually decided just to drill through them and install bolts with nuts.
Mike S., Classic Car Mechanic
Category: Classic Car
Satisfied Customers: 5060
Experience: A.S.E. certified with 25+ years experience.
Mike S. and 8 other Classic Car Specialists are ready to help you
Customer: replied 11 months ago.

Ok - will do.


 


Because there were no threads, it took two people to get these bolts on/off. I thought it was kind of strange to have no threads in this application, but the car is 45 years old after all.

Expert:  Mike S. replied 11 months ago.
Thank you.

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