Topic: Usage of Loctite

[Kouros]

I have all the bike (CB750 K4) apart and have begun cleaning. So as I get ready for assembly, I'm wondering if I'm supposed to use Loctite on anything.

Can you please identify any bolts (specially Suspension or Drive train) that needs any loctite (Red  or Blue).

I searched and could not find the answer. Thanks in advance.

Kouros

[Johnie]

Many times the service manual will specify where to use it.  Off the top of my head I recall the blue Lock-Tite is needed on the 2 front drive sprocket bolts as they have been known to back out.  That is all my brain can recall at the moment...

[BobbyR]

I would think you would use the Blue loctite rather than the Red. The Loctite is used to prevent a bolt from backing out from vibration. About every nut or bolt on the bike is a candidtate.

[shoemanII]

i use service-removable (blue) loctite on front axle clamp bolts, triple clamp bolts, engine mounting bolts.  i reduce each specified torque value just a touch also.
bobp   

[GreenHornet74]

you should also try putting some on where cable connects to the speedo & rpm tach. i was riding the other day and my the rpm gauge stopped working. pulled over and it somehow the cable got loose and came off.

[KingCustomCycles.com]

We are lucky, the Harley guys have to use JB Weld on all their fasteners, then the whole bracket just breaks off.

[BobbyR]

you should also try putting some on where cable connects to the speedo & rpm tach. i was riding the other day and my the rpm gauge stopped working. pulled over and it somehow the cable got loose and came off.

Actually no I would nut use it there. I would use teflon tape, sounds odd, but it will tighten the thread and also cut down on vibration. It is dead stuff.

[BobbyR]

We are lucky, the Harley guys have to use JB Weld on all their fasteners, then the whole bracket just breaks off.

That is very funny. It is also true. I was watching some new HDs this weekend. Never saw engines shake like that. Maybe it's the rubber mounts, but geeze.

[mystic_1]

you should also try putting some on where cable connects to the speedo & rpm tach. i was riding the other day and my the rpm gauge stopped working. pulled over and it somehow the cable got loose and came off.

Actually no I would nut use it there. I would use teflon tape, sounds odd, but it will tighten the thread and also cut down on vibration. It is dead stuff.

+1

I think loctite would be overkill for that location, those retaining rings aren't all that durable.  Never needed anything there to keep them in place personally but teflon tape sounds like a good bet.

mystic_1

[HondaMan]

The only place I use Loctite on these 750s: on used rod bolts, if they were disassembled. Use  blue, and sparingly. Also: 'feel' those bolts back in, as they take a bit of a curve after years of heat-treating, and should go back in the same way. You'll be able to tell which way is easier... 

Nothing else in the engine needs it, if torqued to the right specs: 90-96 inch-lbs. on the 6mm bolts with 15mm or more threads, 200-210 inch-lbs on the 8mm bolts/nuts.

[wildcatmahone]

All the front fender mount screws, handle bar clamp....

[BobbyR]

One of the side benefits of Loctite beyond holding a bolt in pace is that it offers a bit of insulation between dissimilar metals. It is not meant as a substitute  for proper torquing. The principal behind torquing  is that it literally stretches the bolt which will try to retract to it's original legnth and thereby exert pressure against the threads and hold tight. Used bolts may have lost some of their ability to retract since they have been stretched already. In this case Loctitie can help a bit. In my industry certain bolts can be torqued to 495 ft lbs and use a 2 part Loctite. They are very difficult to remove. A nice dab of the blue is all you would need.