Despite the use of threadlocker being somewhat widespread (e.g. repair videos), I have yet to see a single recommendation to use it in any service manual. Perhaps this is my relative inexperience, but I thought I'd ask the community out of curiosity - do you use threadlocker? If so, what is your criteria for deciding which bolts receive threadlocker and which ones do not?
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It depends on the vehicle but it's not uncommon to see threadlocker specified for assembly.
Use threadlocker when it's called for. Today many modern vehicles use one-time-only fasteners instead of threadlocker so it may be less common now than it was in the past.
I use threadlocker when the service manual says to, I replace fasteners when called for, and I just torque to spec when that is all that is specified.
jwh20
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The main places I have seen the required use of Threadlocker or Retaining Compound (e.g. Loctite 638) specified in a car repair manual is on the splines of driveshafts.
I have also seen a band of threadlocker already in place on new bolts that are used to hold brake callipers on.
HandyHowie
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