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Tosh

Tosh

Jedi Trainee
Offline
Guess what this is.

DSC01337.jpg


Give up?

Well, this is not what you want any of your valves and springs to look like.

Keep on.
 
I don't even wanna see the head of that piston, or the valve seat. OUCH!
 
If only mine would'a looked that good. Lost the piston
too....

We think first a valve, then the piston.
This is what my piston looks like now....

P1010001-6.jpg


Shut her down as quickly as possible. Think it saved
the head and block.
 
Well, here's how that went.

The engine was at idle by the time the valve dropped down into the cylinder.

It was around midnight; post thunderstorm; starry sky; top down; about .5 mile from home. This impending seizure gave plenty of advance warning.

There was a light ticking sound such as I had never heard and this had carried on for about the last 3-4 miles from home. I was taking it real easy cause I was nervous.

Depressed the clutch to see what effect that had on the noise-bam! the engine stopped solid. Clutch still in, I shifted to neutral and coasted to within 100 yards of my house. No traffic; didn't have to stop for anything.

My son and I towed the TR up to the garage and pushed it in. Talk about a silver lining in a dark cloud.

This occurred 1 1/2 years ago now and I have everything back together.
Damage? A half moon imprint on the top of the piston and a couple of nicks on the cylinder wall. Radiused away the sharp edges, redid the head, new valves (2) new dual valve springs (12).

2wrench I feel your pain. Fortunately I never had to drop the botton end.

So far everything is copacetic.

Keep on.
 
Yes. Quite original.
Pushrod was OK.

Keep on.
 
Sorry, rlandrum I realize that your query was directed at 2wrench.
 
Tosh said:
Sorry, rlandrum I realize that your query was directed at 2wrench.
Click to expand...

It wasn't. Strange that a spring would fail out of the blue. Never personally seen it happen.

Was there any apparent cause? Was the valve a little too short, or was it just a defective spring?
 
You know, guys, from what Tosh says, it's so like
what happened with me, cepting the ticking was
very short-lived.

From now on, if I hear a ticking, I think I'll shut her
down and call AAA.
 
Chalked it up to metal fatigue AFAIK*. Those springs were 40 years old.

Engine builder who did the head says that that type failure is not that unusual ('course he builds drag motors).

I suspected that because I had the valves adjusted at the tight end of .010 it might have overstressed the springs. My tech says no.

I think am extraordinarily easy on motors too. No redlining, no lugging.

Whatever.

(*as far as I'm concerned)
 
I had quite a collection of those type of things. Never pleasant.

This one I kept... 2300 hours, West Springfield, Mass. On the Turnpike at 65 MPH. First Wife at the helm. Rod bearing spun, seized, rod snapped and shoved itself thru the side of the block. Bad Karma.
 
Interesting how the 'MOWOG' label came through unscathed. Heh, heh.
Must be MG.
 
No. Just stereo pinking noises instead of mono.
 
<div class="ubbcode-block"><div class="ubbcode-header">Quote:] This one I kept... 2300 hours, West Springfield, Mass. On the Turnpike at 65 MPH.[/QUOTE]

Doc,

I know that section of highway well. I made many a trip over that way going to visit a supplier in the Berkshires. Glad I don't have to do it much anymore, especially in the winters.
 
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