Big end bolts - loctite or not?

[itiejim]

Any thoughts on whether I should use loctite on my big end bolts or not? I never have in the past (on relatively low powered inline 4's) but I do wonder whether my 400 bhp AJP V8 should have a bit.

[eliot]

I've never done it on the rover and chevy lumps I've done - correctly torqued nuts will stay put.

[itiejim]

Thanks folks, I might have a chat with TVR Power.

[Boosted LS1]

I agree with Eliot. Loctite may change the preloads on the bolts. You could torque them up and then add a drop of loctite to the threads afterwards. That will seap into some of the threads, I've done that before now.

[itiejim]

Thanks guys, I'll carry on as before - I've not had a big end bolt drop out yet!

[Pumaracing]

Never ever use loctite on a high tensile long bolt with a specified torque or angle setting. The stretch put into the bolt stops it undoing and nothing else will help further. Loctite is for low torque or short screws with insufficient stretch or thread length to overcome any vibration they may be affected by.

[Auntieroll]

Pumaracing said:

Never ever use loctite on a high tensile long bolt with a specified torque or angle setting. The stretch put into the bolt stops it undoing and nothing else will help further. Loctite is for low torque or short screws with insufficient stretch or thread length to overcome any vibration they may be affected by.

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