Valve stem seals replacement in situ

2622

2622

Hero member
Location
Sydney
Here's one for the brains trust before I reinvent the wheel.... perhaps someone has already a "wheel"
Have changed out a lot of valve stem oil seals on various motors over the decades but cant remember doing them on a triple.. ..has anyone done this and if so do you have a picture of the tool which you would have used to compress the springs to remove the collets..

I am thinking of being lazy plus dont want to waste a perfectly good head gasket if not needed.........just starting to get a bit tired of pouring good quality oil down the guides and out the pipes......

 
I suppose you are aware of the fact, that only the inlet valve have seals, right? so - if there is oil at the exhaust, head-off will be the operation of choice as you will need new guides... if it just burns oil (blue smoke out of exhaust), it might be the inlet seals...

you will need two things: one is an airpressure adapter fitting into the sparkplug hole to keep the valves closed (or a bent thick wire, a second person to hold the valve up in place and the Piston on TDC). Second thing will be a tool SIMILAR (!!) to this one:

http://www.tbs-aachen.de/Kfz_Spezialwerkzeuge/Motor/KS-Tools_1500918_Ventilfederspanner_i261_57082.htm?gclid=CMbimLDaltECFUM8GwodLyAKQA

or

https://www.google.de/shopping/product/4750465533669911343?q=ventilfederspanner&rlz=1C1CHWL_deDE706DE706&espv=2&biw=1280&bih=909&bav=on.2,or.r_cp.&bvm=bv.142059868,d.d24&ion=1&tch=1&ech=1&psi=WJdjWKCwIMGrU4jerBg.1482921848454.5&prds=paur:ClkAsKraX8TgTYI2Hc7m4mN1S20kbXnl-X_jjq9XmDS3CQsGMXuBwIMa4lu0or30jCdaOqY-XrATNRwNCR7YrQtpGtfPakeMSrEVGvrWE4y15b2ZNlZJ78KDFBIZAFPVH713ZjZcK4OtIQYcFdVGil2H8Aa4eg&sa=X&ved=0ahUKEwiV7PCk2pbRAhVDMFAKHVw7ArAQ8wIInQIwAA

there is a Laverda version of it I think, just don't have the pic of this one...
 
Hey Lothar
Yep am aware only the inlets ..........all my engines are like that except for the Cico as it has a REDAX engine in it.
I know the exhausts are shot on the RGS but if I can get away with changing out the inlet stem seals for the time being so be it.
Long story when the engine was apart a new head was supposed to go on but well that's another story for another day so the old one just went straight back on.

I got various in situ tools but none will work on the Lav head but thanks for the link anyways appreciate it.

Second link didnt work

 
Davo said:
Crikey.  :o Looks like part of my fence wire strainer.
Click to expand...
Did the job back in the day who the hell cares what it looks like... bet the one I knock up wont look as purpose built.
 
If you're hell-bent on doing the seals in situ consider passing a thick piece (10mm dia) of cotton rope through plug bore w/ piston @ BDC, when the piston is raised the rope presses against the closed valve holding it in place when the collets are removed; about a foot of rope will do. Works well w/o having to keep air pressure in the bore or needing another pair of hands to hold valve up. 
 
IAG said:
If you're hell-bent on doing the seals in situ consider passing a thick piece (10mm dia) of cotton rope through plug bore w/ piston @ BDC, when the piston is raised the rope presses against the closed valve holding it in place when the collets are removed; about a foot of rope will do. Works well w/o having to keep air pressure in the bore or needing another pair of hands to hold valve up.
Click to expand...
Like I said done heaps of them over the years never used cotton rope to  be honest......using it should be done with utmost caution for the uninitiated as can see that method easily turning to disaster...
on another note speaking of cotton rope saw a neat trick with cotton twine to pick 5 and 7 series Beemer locks when I was at a Locksmith show in Korea .....
 
Pretty straightforward if you have a tool, I used the tool I made to fit a valve spring compressor. This was done at the side of the race track to replace a broken valve spring.
The string fed in through the plug hole is a USB cable, well padded and soft.

The reverse for assembly, is pretty easy, I sit the collets on the stem resting in the retainer, they usually drop in 1st time when the spring is compressed by hand.  I chop the old seal very carefully with a sharpened chisel made from an old screwdriver then it pulls off with long nosed pliers.  if you have any doubts about your ability, you can really mess things up with those last operations.



 
Robjota said:
Pretty straightforward if you have a tool, I used the tool I made to fit a valve spring compressor. This was done at the side of the race track to replace a broken valve spring.
The string fed in through the plug hole is a USB cable, well padded and soft.
Click to expand...

Ahh I like it, proves that necessity is the mother of invention !!
 
IAG said:
If you're hell-bent on doing the seals in situ consider passing a thick piece (10mm dia) of cotton rope through plug bore w/ piston @ BDC, when the piston is raised the rope presses against the closed valve holding it in place when the collets are removed; about a foot of rope will do. Works well w/o having to keep air pressure in the bore or needing another pair of hands to hold valve up.
Click to expand...

Why not pump compressed air into the cylinder via the spark plug to hold the valves up. do what you want then.
 
ghwallice said:
Why not pump compressed air into the cylinder via the spark plug to hold the valves up. do what you want then.
Click to expand...

That way you can do a leak down test at the same time  :D
 
Pushing some nylon rope into the spark plug hole is bulletproof. Turn the crank by hand until it stops. Impossible for the valve to fall into the cylinder...
 
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