Honda-SOHC

SOHC.co.uk Forums => CB350/400 => Topic started by: DayvW on February 25, 2014, 10:43:52 PM

Title: Liquid Packing?
Post by: DayvW on February 25, 2014, 10:43:52 PM

In various places in the manual (76 400-f) it mentions using liquid packing on mating surfaces (eg. the crank cases where there is no gasket).  Previously someone has used some red stuff that has gone brittle and I find bits all over the place (some in the sump).  Wanting to avoid this again, what recommendations can anyone make? And when I install new gaskets (with clean faces) would you recommend using it (or other stuff) with gaskets - or just stick to using it just where the manual recommends? Thanks.

Title: Re: Liquid Packing?
Post by: Trigger on February 25, 2014, 10:53:14 PM

I use RTV sealant, but you must smear it on. A thin coat. People put loads on and the access just goes to wast in your oil pump. For gaskets i use Hylomar spray, same again THIN COAT.

Title: Re: Liquid Packing?
Post by: DayvW on February 26, 2014, 08:18:33 AM

Thanks - so something like this: "V-tech Clear RTV Silicone Gasket Sealant 250C (85gm) - Water Resistant Sealant"?  Any reason why a spray rather than a tube - to aid putting a thin layer on?

Title: Re: Liquid Packing?
Post by: Trigger on February 26, 2014, 08:55:49 AM

250c is a bit low. Look for a higher temperature RTV that is oil resistant/ transmission fluid resistant . The spray is spot on but, a bit tricky when applying to crankcases.   

Title: Re: Liquid Packing?
Post by: Clem2112 on February 26, 2014, 10:31:30 AM

Use Yamabond or the equivalent case sealant,  sparingly..... grey and quite runny usually.
Goes on crankcase mating faces around edges and on main bearing joint faces.

Title: Re: Liquid Packing?
Post by: Clem2112 on February 26, 2014, 12:09:08 PM

Remembered it's called THREEBOND

 :)

Title: Re: Liquid Packing?
Post by: DayvW on February 27, 2014, 07:12:47 AM

Thanks guys .. Threebond have a great range - so I will probably go for some of those.