PV seals

[Bozzy]

Hi, Sorry I know this was posted before

Having second thoughts about using instant gasket clear sealant on the PV 'o' rings ? plan to lap them in sealant and fit to make sure they dont leak.. however they are really snug one side got to use mallet to get the thing in! I have the ones with 2 seal rings on the inner section and one outer ie 3 per valve

Sealing my exhausts this way after some time the sealant gets blown out etc.. however with the seals they are tight in the cylinder's.

Not sure if I am setting myself up for a problem not doing it as book.. sure when I removed them I noticed a little sealant..

Used the grease on the castle seals.

Thanks

[urbantangleweed]

Sealant on PV bush O rings is generally a bodge and shouldn't be necessary.

Molybdenum disulphide grease is the usual way, it provides lube to aid assembly and helps avoid damaging the O rings as the bush is inserted.

Evidence of sealant is usually due to a previous builder who doesn't know how it should be done or as an effort to try and seal worn tunnels.

If the tunnels are worn, Dave at Mutts Nuts has slightly oversize O rings which will take up a bit of wear.

[Bozzy]

Cheers might use sealant in the grooves then grease on the outer seal surface just to help stop them spinning

[Bozzy]

Got bit of a problem... when cylinders were on the PV was tight. The were nice apart but as soon as I put the connector on they got really tight just passed full opened.

The right bush was really tight had to tap in with socket... now thinking the sealant is not helping as well. I have removed the left set and used the moly grease to do it right.. but right side think o seals will be ok removing cleanup no off the sealant crap and doing the same?

It does spin ok in the barrel I will add it when joining them..

Got one of MB updated connect no chance I can use the... this bike just keep giving..... what the thoughts sort right but it a bugger to get out...

[urbantangleweed]

Tight valves like you describe when connected but fine when not I find is usually down to the two spindle ends not being in alignment. This can be caused by the cylinders being slightly different heights (if not a matched pair) or by valves being worn unevenly on the part where the joiner goes. In both cases, adding the joiner pulls one valve out of level causing it to bind.