Should I use jointing compound?

[Drew400]

Hi all,

I will preamble this new thread with the announcement that I'm about to start my engine rebuild. Regular readers will know that this is a first for me and so I'm ever so slightly nervous of turning my restoration project into a piece of non-running living room art!

So, here's the first in probably a long series of questions: should I be using a jointing compound to stick the crankcase halves, etc. back together? If so, what substance do you recommend?

Cheers,

D.

[mickwinf]

I used blue hylomar, a very thin smear is all that's needed.

[Lynx]

I'd definitely use one. I used Loctite 5922 non-hardening flange sealant. I think Yambond is the preferred stuff.

[Drew400]

Thank you both.

Cheers,

D.

[Trigger]

Hondabond but,Hylomar is cheaper

[Bryanj]

Ordinary silicone is OK but ONLY if used VERY THINLY so that there is NO squidge into the crankcases

[Clem2112]

Used Three Bond ... They say it's the same as the factory stuff.

No leaks to date.

Other threads on this ie which faces to use it on etc.

I used a small syringe to apply it sparingly(no needle of course)

[UK Pete]

Three bond for crankcase halfs, a light coating of hylomar on all the others, that is my choice, stay away from silicon as it sqeezes out on the inside and snaps off clogging up the oil pump gauze
Pete

[Clem2112]

I can remember when orange silicone rtv was all the rage ...mostly on side cases....nobody would spend cash on new gaskets.
It was ahead of its time that high viz look ! 

[Bitsa (Ralph Wright - RIP)]

The worst was in my opinion bloody red hermite saying that if you was buying a bike you saw it and knew what a bodge job
Cheers
Bitsa

[Drew400]

A most enjoyable and illuminating thread (or is that a smear?).

Cheers all,

D.

[Lynx]

Hahaha. That is very true Bitsa.

[Bitsa (Ralph Wright - RIP)]

Drew
Like the smear bit
Cheers
Bitsa

[K2-K6]

While I appreciate and take note of Bryan's advice of silicone, I wouldn't get that anywhere near any engine unless it was absolutely specified in the manufacturer build instructions.

It is a very useful material for some applications but just not in these engines with small oilways, and as Pete says you get alot of stuff on the oil pickup. I got a picture of one I took years ago of the oil pickup in a Z650 that looks like a pizza there are so many coloured bits stuck to it.

If all the surfaces are good condition then most of any sealant you put on them gets squeezed out so as the others say only the smallest amount is required of whichever one you choose.

[Bryanj]

As one who worked on these for many years in the trade, long before you could lay hands on the genuine Honda, or Yamaha, stuff we used RTV all the time and if used as said you dont get any on the filter screen or in the oilways