Odd 7.3 failure

[DEEZUZ]

We RARELY ever see a 7.3 fail hardcore, but this one got us good...

Any suspects? The kid stayed after to tear it apart, but Im 8 and skate so I didnt stick around to make any other guesses

 

[caladash]

Interesting....what mods did the truck have? And where did they end up?

 

[onebad7.3]

Over torqued?

 

[DEEZUZ]

bonestock in a church bus.

and the other rocker fell off, fulcrum is still bolted down

 

[TurboM700]

It kind of looks like the valve is bent too.

I would think a reverse drill bit and those will come right out.

 

[DEEZUZ]

not, even. i put my finger in the holes and the rest of the bolts turns freely

 

[Old OutLaw]

thats wierd ....CPS went south and out-of-time piston to valve contact mebbe ?

bent pushrod ? very strange....

 

[Silverback]

I seen one a while back that was bending push rods and popping rockers on the same cylinder, was also in a school bus. I think they blamed it on a sticking valve/valve guide.

 

[DEEZUZ]

Well I'll find out today

 

[TurboM700]

thats wierd ....CPS went south and out-of-time piston to valve contact mebbe ?

bent pushrod ? very strange....

how would the CPS cause the valves to contact the piston?

 

[DEEZUZ]

how would the CPS cause the valves to contact the piston?

Yea I wasnt even going to comment on that one. LOL

 

[Old OutLaw]

after thinking it over, it can't ....
my brain was not working @ the time I posted that ... LOL

I don't know, just seems weird that would happen at all....

what are they doing to those School Buses that would cause that ? very strange ....

 

[golfer]

We RARELY ever see a 7.3 fail hardcore, but this one got us good...

Any suspects? The kid stayed after to tear it apart, but Im 8 and skate so I didnt stick around to make any other guesses

..wouldn't call that a hardcore failure, LOL...

but I would guess that whomever worked on it last left the rocker pedestal bolts loose...then the 'hammering' over time fatigued the bolts and the simply broke...

spin the bolts out, replace the rocker pedestal & rocker, ensure that the lifter didn't come out of its bore...then put it back together and move on...

 

[kyle43335]

how would the CPS cause the valves to contact the piston?

it cant

 

[Marty]

..wouldn't call that a hardcore failure, LOL...

but I would guess that whomever worked on it last left the rocker pedestal bolts loose...then the 'hammering' over time fatigued the bolts and the simply broke...

spin the bolts out, replace the rocker pedestal & rocker, ensure that the lifter didn't come out of its bore...then put it back together and move on...

One of my first major jobs started out as this scenario that you guys reffered me.

Broken rocker arm bolts. Except the guy over tightened them and snapped it off during installation IIRC.

 

[dietoremain]

Man that looks like a fun mess to clean up.

 

[Arisley]

..wouldn't call that a hardcore failure, LOL...

but I would guess that whomever worked on it last left the rocker pedestal bolts loose...then the 'hammering' over time fatigued the bolts and the simply broke...

spin the bolts out, replace the rocker pedestal & rocker, ensure that the lifter didn't come out of its bore...then put it back together and move on...

My thought exactly.

 

[MoneyWellWasted]

that is odd about as odd as injector hold down bolts breakin off

 

[DEEZUZ]

Lifted head, piston was never contacted, but when air was put in cylinder is was creeping out the valves. Lifter came apart, not the roller, the top portion came out. We still cant find the rest of one bolt. dropped pan and everything...

 

[Derek@Vision Diesel]

Had that happen on my OBS once before. I think Dave hit it right on the head, not exactly a severe failure.