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MacLeod Willy
Samba Member
Joined: February 18, 2014
Posts: 933
Location: Ontario Canada
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 Posted: Thu Oct 02, 2014 3:19 pm Post subject: Dropped Valve |
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I PULLED THIS VALVE FROM A RUNNING ENGINE TO REBUILD THE HEADS. The valve rolled off the lathe bed and hit the floor and snapped in two. You rarely see an exhaust valve moments before it drops and works its way to the oil pan 
You can see what little material was holding on the rim with the centre rusted.
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
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| Posted: Thu Oct 02, 2014 4:23 pm Post subject: |
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Bear in mind....most valves are two pieces. The stem is made seperate from the head. They are usually friction/spin welded together or sometimes machine induction welded.
It looks like the weld was improper and either leaked and oxidized...or may not have pentrated enough and trapped moisture/oxygen between the two parts. Ray |
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MacLeod Willy
Samba Member
Joined: February 18, 2014
Posts: 933
Location: Ontario Canada
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| Posted: Thu Oct 02, 2014 5:35 pm Post subject: Dropped valve |
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| Bet there wasn't another 1/2 hr running left in that one |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
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| Posted: Thu Oct 02, 2014 6:38 pm Post subject: Re: Dropped valve |
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| MacLeod Willy wrote: |
| Bet there wasn't another 1/2 hr running left in that one |
Yep....thanks for posting that....never seen it before. Maybe others have. Ray |
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williamM
Samba Member
Joined: August 07, 2008
Posts: 4333
Location: southwest Arizona
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| Posted: Thu Oct 02, 2014 7:03 pm Post subject: |
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BUY LOTTERY TICKETS your already $1000 ahead- you might be on a roll.
Fell off the bench  and broke in two  
That looks like a sodium filled 9mm exhaust valve that might have been machined wrong or stretched at the joint.
May nave to rethink using those- or at least give them the "fell off the bench test".
_________________
some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
Don't step in any! |
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MacLeod Willy
Samba Member
Joined: February 18, 2014
Posts: 933
Location: Ontario Canada
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| Posted: Sat Oct 04, 2014 6:05 am Post subject: dropped valve |
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| I put all new valves in the T4 but I kept the old ones because the margins were great and the stem was good. Thought in case of a pinch. That pinch would have hurt! |
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williamM
Samba Member
Joined: August 07, 2008
Posts: 4333
Location: southwest Arizona
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| Posted: Sun Oct 05, 2014 6:42 am Post subject: Re: dropped valve |
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| MacLeod Willy wrote: |
| I put all new valves in the T4 but I kept the old ones because the margins were great and the stem was good. Thought in case of a pinch. That pinch would have hurt! |
Stem was good  to use as a tent spike- I've never seen a valve fail like that that wasn't in a running engine. Glad I bit the bullet and replaced all the e valves going in the 2.0.
Thanks for sharing- 
_________________
some days I get up and just sit and think. Some days I just sit.
opinion untempered by fact is ignorance.
Don't step in any! |
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