Valvolean

[albanycobra]

I set my pushrod length at 50% valve lift at cam and the rocker at 90deg to the push rod for a starting point.

[LoBelly]

Originally Posted by albanycobra

I set my pushrod length at 50% valve lift at cam and the rocker at 90deg to the push rod for a starting point.

I think I must have been typing ... looks like we've both used the same

method.

LB

[Gaz64]

Just to clarify, is it not the valve head that has snapped off, which happens from piston contact.

The valve stem has snapped just under the valve collets from side loading, from the rocker arm pushing the retainer at early valve lift.

That would be a rare failure, but it shows the strength of your collets and retainer.

I would hope all of the valves were inspected for this condition.

Now this time, with the light spring fitted, every clearance needs to be checked, valve to piston clearance, retainer to rocker, rocker to stud etc, throughout the full 4 stroke cycle of the engine.

Gary

[Bernica]

I just hope you can find all those pesky little metal parts that went somewhere when it broke!

[Aussie Mike]

Glad you got it sorted Michael. Is the piston OK?

Cheers

[LoBelly]

Originally Posted by Aussie Mike

Glad you got it sorted Michael. Is the piston OK?

Cheers

I think so - I stared at it for ages and it held together

It looked to me like I was very fortunate with the timing of the valve drop and it appeared that the valve had just knocked the carbon off the piston.

... stand by for my future thread on a broken piston and conrod through the block



LB

[boxhead]

Good stuff LB.
Have you measured the old pushrods to see what length they are?

[LoBelly]

Originally Posted by boxhead

Good stuff LB.
Have you measured the old pushrods to see what length they are?

Going from memory 6.250" - which I think is standard length

ta
LoBelly

[LoBelly]

On with the show

here is the recovered valve


Gaz - and some of the less eagle eyed amongst you - will notice a harmonic balancer sitting on the bench behind the ex-valves.

And you may notice that in Post #28 there is a ratchet attached to the crank bolt. Its a very convenient way of turning over the engine as you check all sorts of stuff and as you re-assemble the engine and set stuff up.

And after 4 months it may transpire that you finally have all the bits and pieces you need and can (and do) re-assemble your engine and fire it up.

Stopping to recharge the battery because it seems to have difficulty turning over...

Only to look down at the front of the engine when you're trying to set the idle and notice your ratchet is now hard up against the chassis and appears to have wisps of smoke coming off it

[Gaz64]

Wow, look at the bend in the valve stem.

Sheared off straight under the valve collets.

Thank god the piston is ok.

Can you see what I mentioned about the lifter for that valve in one of your early photos?

Or is what I see an illusion?

Gary

[Bernica]

Again, did you find the rest of it somewhere in the engine?

[427sharpe]

Can't believe the silly string valve pic! Holy moly.