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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 :eek: :) LB |
Good stuff LB.
Have you measured the old pushrods to see what length they are? |
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ta LoBelly |
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 |
I just hope you can find all those pesky little metal parts that went somewhere when it broke!:eek:
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I've had another look for some time, and the lifter for this valve failure also looks different in your photo compared to the other 7.
The pushrod seat in the lifter looks different. Pushrod seat has come out? Gary |
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I have uploaded a better picture (below - you can zoom in by holding down Ctrl and scrolling up with your mouse) The lifter looks different because it is not covered in oil - I suspect I wiped it as part of the general inspection - if you zoom in you will be able to make out the various parts of the lifter (as visible from that angle) and those parts will just be cleaner than the ones around it. https://lh5.googleusercontent.com/-0...o/IMG_0714.JPG |
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(and like replica cobras - has 40 years worth of updates :( ) |
On with the show
here is the recovered valve https://lh3.googleusercontent.com/-1...o/IMG_0739.JPG 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 :( |
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 |
Again, did you find the rest of it somewhere in the engine?
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Can't believe the silly string valve pic! Holy moly.
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I should have mentioned this earlier.
Have you thought about going to beehive springs? The technology is out there now with a lot of spring manufacturers. Lighter springs, combined with a lighter retainer. Would also give a little more clearance with the rocker arm. Gary |
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I think it might be an illusion - I just cleaned that lifter to get a good look at it to see if I could find anything wrong Quote:
As Gaz says the valve tip just sheared off so the 'rest of it' was retained by the collets in the top of the spring. Its in one of the earlier photos Quote:
ta LoBelly |
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