Dropped valve

big tee · May 1, 2016

I posted this down below in tractor pull but I thought I would post it here also. This piston is out of my 6030 Deere I pull. This is what happens when you drop a valve at 3000 rpm. If you look close you will see the valve still sticking out of the piston. I was cleaning up around my bench and I thought I would share with you what I found. When the clattering and the smoke cleared the announcer asked me if I wanted to drop 6 places and take a re-hook. Shook my head NO........Tee

rrlund · May 1, 2016

I dropped one in a 250 six cylinder in a 67 Chevy II Nova one time. I sold the car to a neighbor kid and somehow,he managed to wedge a 350 out of an Oldsmobile in to it.

rustyfarmall · May 1, 2016

Farmall H. Strange clanging sound from engine. Pulled the rocker cover, discovered one valve had lost the keepers. removed the spark plug, stuffed rope into the cylinder to hold the valve up, compressed the spring a bit, installed some used valve keepers, replaced the rocker cover, and went right back to mowing. 2 years later, that H is still running like a top.

Bob Bancroft · May 1, 2016

I was cruising along, in a big field for here(41 acres) nearly done chisel plowing it with my old Steiger, with a Cummins VT903, when all of a sudden it started shuddering, and lost power. No bad, loud noises! So, I limped it home. (Seemed like it took the rest of the day to get the little old mounted chisel on the 4020 and finish up!) I guessed at the cold cylinder, and took that head off. The top of a valve had dropped off, pounded on the piston a few times, and was stuck back up in its home seat, upside down! I considered not changing the piston. But even though the top of the piston was very thick, under one deeper mark, you could just make out a fracture on the underside of the piston. Had the head overhauled. Installed new piston. Then the next winter had the other head done.

fixerupper · May 1, 2016

I saw that happen to a Cat truck engine when it was jaked at over 2000 RPM's. It was #1 cylinder. I was told #1 is the first to go whenever a Cat is allowed to rev too high with the jake on.

Tech 7 · May 1, 2016

Friend of mine was trying to get "there" before me with his Ford Elite, was running about 90mph, lifted his foot to cross the railway tracks and the game was over. That valve managed to flip over and go stem first through the piston. The guy that fixed it for him has that piston on his desk to this day.
BTW I got there first

JOCCO · May 1, 2016

Dropped 2 in 6v53 Detroit at wide open Pieces came out of the engine!!!

Traditional Farmer · May 1, 2016

Looks like it might have been expensive.

Ultradog MN · May 1, 2016

Ouch!
When I was a kid - maybe 10 or 11 my cousin dropped a valve in his fairly late model 560 JD.
The valve turned around and Imbedded the stem into the top of the piston. Even as a youngster I had an interest in engines, etc and had taken apart a couple of old Lawson one cyl engines that my grandpa had just to see what was inside. So I could tell right away that piston was ruined.
Our cousin had the engine repaired and ran it till he passed away 30 years later. The piston layed by the tree in his yard for years. I was always amazed how big it was and the force required to drive the valve stem into it.

Geo-TH,In · May 1, 2016

My wife'sVW 1969 air cooled, dropped a valve at 2 in the morning on I 65 near Elizabethtown ,Ky. This happened in 1975. That was the last time I had anything to do with VW.

I feel the VW was Hitlers was of getting even with us for losing the war.

big tee · May 1, 2016

So-----What did I ever do to Mr. John Deere ????????????

Paul from MI · May 1, 2016

Neighbor's VW van dropped a valve 40 years ago, drove it thru the top of the piston like a big old nail. I pulled the engine, removed the head, had new valve installed. Then just replaced the piston, honed the cylinder and threw it all together. Don't know what happened, he sold it soon after, but I wouldn't be afraid of it.

Geo-TH,In · May 1, 2016

You may have been seeing Mrs Deere and Mr Deere was upset and dropped his valve.

cole in mo. · May 1, 2016

Neighbor dropped one in a 7050 allis, didn't want to walk the 2 miles home, so he drove it back. Needed a new sleeve and piston, along with a new head. A valve spring broke in my 706 263, it was missing but never dropped the valve into the cyl.

Dropped valve

big tee

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rrlund

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rustyfarmall

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Bob Bancroft

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fixerupper

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Tech 7

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JOCCO

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Traditional Farmer

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Ultradog MN

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Geo-TH,In

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big tee

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Paul from MI

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Geo-TH,In

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cole in mo.

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