Click Click Boom!!!!!
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Goodysnap, May 14, 2020.
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Another Canadian driver, Cattleman84 and tommymonza Thank this.
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I have gone through all reports and found nothing stored in fault codes or data that recorded such an event.
In my 8 plus years with Paccar this is a first for me with this engine, from EPA 10 to current. I have seen 1 tube bent maybe 2, 1 rocker broke. Never all 6. Plus all valves are bent and no compression.
It screamed for sure. Maybe even north of the 3k @spsauerland mentioned.
Wish I had a number, but I don't. ECM was sleeping? Key off?Another Canadian driver, Shawn2130, spsauerland and 1 other person Thank this. -
I have spit two pushrods in my life. Both were exhaust side. One on a p-pumped 6bt and one on a mechanical dt466. Both run pretty hard.
The 6bt i just hammered it straight on a curb stone, relashed it and kept going. Engine is still together in a parked truck 900 miles away.
The 466 was a fresh rebuild, like 4k miles on it. The assembler put valve seals on instead of oil deflector shims. The old 466 was a low flow top end and the newer NGD series is higher but theres an inbetween model with 3/8 stem diameter and high flow so every kit has seals and shields. He chose wrong. The exhaust valves are hotter so they are the first to overthin the oil and gall the shaft in the guide. The guides were almost worn into the head casting whe it spit the pushrod, chunked a corner of the rocker and i tore it down. The valves walked so much they had eating into the bores badly. I put in new guides and valves, did another valvejob and put it back together.
A dropped exhaust pushrod will always sound like a basketball being dribbled on concrete inside the engine. Youll feel pops of air coming back out the intake. Its the compression being stuck in the bore until the intake stroke opens it and vents.
Look at your valve stems for scoring and guides to be shot. Low oil pressure in the head will do it. MAYBE being way overheated too. But it starts with galled valves sticking in the open position. The rocker arm moves away, the pushrod falls down and the rocker crushes them. Then its stuck in the tube and holds the valve open for the piston to eat it.Another Canadian driver, BoxCarKidd and speedyk Thank this. -
Another Canadian driver, SL3406, Itsbrokeagain and 6 others Thank this.
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bzinger, Another Canadian driver, little cat 500 and 1 other person Thank this.
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Autoshift or standard?Another Canadian driver, Shawn2130, Goodysnap and 2 others Thank this. -
Another Canadian driver and pushbroom Thank this.
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Key off? Wonder if she was sucking in an external fuel like H2S or propane? Driver shut the key off but she just kept spinning, running on vapours?
RockinChair, Another Canadian driver, Isafarmboy and 1 other person Thank this. -
Could it have been towed with shaft in and in a lower gear? Key off?
Another Canadian driver, tommymonza, FoolsErrand and 4 others Thank this. -
Somebody used ether with glow plugs?
RockinChair, Another Canadian driver and Cattleman84 Thank this.
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