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ZF treaded studs questions

K kitchenguyMember

Detailing a ZF and have a few technical questions:

1- Did the factory use any thread locking agent on either the in board or out board portions of the 10mm and 8mm studs for the axle carriers and rear cover respectively?

2- II in the case the factory didn't use a thread locking agent, would it be prudent to do so in reassembly?

3- Is thoroughly cleaning and spraying these threaded studs with a self etching primer not recommended for any reason

4-What are the torque specs. for these fasteners?

Original Post
C coreypriceMember

I can't answer whether the factory put thread locker on the studs. However in my experience, there isn't any and gear oil tends to weep thru the studs. Last year I re-sealed (for the second time) my ZF to reduce weeping and leaks. It worked great and now I don't have an actively leaking ZF. I used high-temp thread sealant instead of PTFE paste or tape on the side cover studs. It seems to be working great.

I'm not sure on the self-etching primer.

Torque specs vary with the part. I will look but the manual is available to download if you're a POCA member.

Last edited by coreyprice

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