Gallery, Projects and General > Gallery

I haven't been totally idle.....

<< < (5/5)

NickG:
Ralph,

Did I read right that you pressurised the cylinder to stop the valve dropping in? How did you keep the spring compressed whilst you fished the collets out?

My grandad made a similar thing many moons ago I would imagine and I still use that one, it's for when the head is off though. I hold the lever under my arm (ouch) so both hands are free and use small magnetic screwdriver to get the collets out. Quite fiddley but once you get used to it it's not bad!

Nice job, well worth doing so you don't have to take the head off.

Nick

Divided he ad:
Hi Nick,

Yep, you read right.... There are two methods;

1/ put the piston up to the top of the cylinder (use a long screwdriver down the plug hole as a TDC gauge) and the valve rests on that.

2/ put air adapter into the spark plug hole and pressurise the cylinder (piston must be at BDC else the engine spins over when air is applied) we would usually use 60-100psi when done in the garages I've worked at, a compression test will give much higher than that so you're not going to damage anything.
The valves rarely move as 60-100 pounds of pressure on the valve face is a fair old push!  (if they fall in.... You're just going to have to do it the way you used to!!)


The spring (once the crack with the hammer has released the collets) has no effect on the valve stem, so you just have one guy pulling on the lever and another fishing out the collets with a magnet on a stick, all the other stuff comes off without putting any pressure on the valve stem.

The re-fit,  You just have to be carefull to line the spring and cap up correctly and then push down making sure not to hit the valve stem, re-fit the collets (I use a non-magnetic screwdriver with a blob of grease on the end. It holds the collet well and is removable without accidentally taking the collet back up or moving the first one you fitted  :thumbup: ) and gently raise the tool allowing the spring to clamp the collets and valve into place.


It's an old idea, draper etc  make kits using the same idea, just £100.00+  :bugeye:



Glad you like the job  :thumbup:



worked a treat :headbang:





Ralph.

NickG:
Thanks Ralph, I just couldn't see in the video how the spring remained compressed, couldn't see the extra pair of hands which baffled me!

Navigation

[0] Message Index

[*] Previous page