I'm not sure they make them that small. Even one small enough to fit through the injector nozzle hole is pushing it.
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Lost the motor?
- Thread starter danzick
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Compression check it. Cheap and easy to find out.
But yeah, like Corbin said, when you put all the compression into the lower end of the block, the pressure pushes the oil back up the oil return to the heads and out the pcv or as the oil squirter is injecting oil, back out the exhaust valve. Not to mention the amount of windage and aeration the pressure/air causes that will cavitate the pump.
But yeah, like Corbin said, when you put all the compression into the lower end of the block, the pressure pushes the oil back up the oil return to the heads and out the pcv or as the oil squirter is injecting oil, back out the exhaust valve. Not to mention the amount of windage and aeration the pressure/air causes that will cavitate the pump.
Ah that makes sense. I bought a hf compression tester today. Truck is still on the trailer. Hopefully unload it tomorrow night. So what lesson is there to be learned here? Did it happen from high egts? Or from the 240 plus oil temps I was seeing pulling before I did the cooler? I don't want to do this again!
There is no lesson....we all pay to play. Age, mileage, power, it all plays a roll eventually. Lb7 pistons still crack just not as pron to it as lbz/lmm. Alot of us have seen stock trucks crack pistons and break cranks.
I've done that many times before. I wasn't wide open or anything. Just part throttle trying to get on the interstate.
put it back to 100% stock then, thats about your only chance. Otherwise, this is the game we play. built short block would be the only other way around it.
what size injectors do you have?
that didnt help. stock means high pulse width and high timing. that means high cylinder pressures and heat when you beat on it before which may have started a crack or made a brittle area on the piston. then normal driving with little bit of spirited here and there finished it off. non-delipped pistons added to that issue.
Gotcha. Well I'll probably be going with a set of mahle performance cast pistons. I think it's beyond a cracked piston. The amount of oil coming from the exhaust and the level of knock I was hearing makes me wonder if it totally crumbled.
Fuel soaked creosote also appears oily. It honestly may not be as bad as you think, but sucks to have happen either way. It is never a fun day spending a lot of money to repair a vehicle.
Nevermind. Definitely not doing a compression check. Pretty sure I'm draining the coolant system through the oil pan.
Time to pull it out. When you over revved it you could of had piston and valve contact and broke the head of a valve off. You will know when you pull it apart or pull the valve covers to see what the damage is.
Ouch!
yup, like zerogravity said. over-revving it floats the valves. you can either pop the keepers off doing that and drop a valve or if its bad enough, the piston hits the valve, bends the stem, breaks the head off and the valve head kills the piston, head, etc.
compression test aint worth it now lol
yup, like zerogravity said. over-revving it floats the valves. you can either pop the keepers off doing that and drop a valve or if its bad enough, the piston hits the valve, bends the stem, breaks the head off and the valve head kills the piston, head, etc.
compression test aint worth it now lol
Yeah.... I just can't believe it overreved like that. I can't imagine kory messes with the factory limiter. Expensive mistake! Do you guys think I have a hole in the cylinder? Or the head is punctured?
if it is what we think it is then more then likely it's the piston. you may be able to get away with a new piston, cleaning up the head, new gaskets and hardware and you will be back in business
if it's the valve then you have a lot more to fix then just replacing a piston. probably a new head and piston minimum if you're lucky.
if it's the valve then you have a lot more to fix then just replacing a piston. probably a new head and piston minimum if you're lucky.
A cracked piston wouldn't put coolant in the oil. A rod smacking the block will. If I was a betting man your long block is destroyed.