ouch, please help
Discussion
hi all, hoping someone will forgive my relentless stupidity and give a bit of advice. my big stupid isuzu overheated on the motorway (3 miles from home and 3 metres from my junction, but it could have been worse) which is all my fault for not fixing a leaking coolant pipe! anyway, it still cranks over but doesnt start so i took off the rocker cover to find the long things that the rocker moves up and down are a bit bent so was wondering if anyone knows how extesive the damage could be? could it just be the long things that need replacing? its cold outside and i dont want to carry on stripping the engine down if thats all it is!
when it 'went' it sounded pretty bad, and the first time i tried to crank it, it struggled to start with and then was ok. the engine by the way is 3.1 turbo diesel interguzzler from a isuzu trooper.
Cheers,
Russ.
Your powers of description are wonderful !!!
Hard to say what damage has been done. By your description, it soulds like pushrods are bent. This would be something more likely to happen if the timing belt or chain broke.
Usually overheating will blow head gaskets, warp the head, and maybe sieze the pistons in the bore. It just depends how bad it was heated as to how much damage.
Sometimes if its not bad, you get away with fixing the leak, re-filling and all is well.
Hard to say what damage has been done. By your description, it soulds like pushrods are bent. This would be something more likely to happen if the timing belt or chain broke.
Usually overheating will blow head gaskets, warp the head, and maybe sieze the pistons in the bore. It just depends how bad it was heated as to how much damage.
Sometimes if its not bad, you get away with fixing the leak, re-filling and all is well.
thats what i thought mate, maybe the overheating is just a coincidence, or maybe the overheating caused the timing belt to break? guess ill have to strip the head off and have a closer look, i hope the valves arent dead cos theyre expensive!
ps- what do the pushrods push? do they sit on the cam and move the rockers? im used to everhead cam engines.
Cheers again,
Russ.
ps- what do the pushrods push? do they sit on the cam and move the rockers? im used to everhead cam engines.
Cheers again,
Russ.
most owners dont even know a Isuzu trooper has a cam belt its behind a cover that looks like a timming chain cover, turn the engine over and see if the push rods move
I would say the belt broke, pistons hit valve and bent the push rods, if it was overhead cam it would have bent the valves. as last post said change the bent rods and any rocker arm reset tappets and you should be away
thats after replacing the cam belt
I would say the belt broke, pistons hit valve and bent the push rods, if it was overhead cam it would have bent the valves. as last post said change the bent rods and any rocker arm reset tappets and you should be away
thats after replacing the cam belt
Hence the 'its possible' bit. Consider that at the point of contact between valve and piston the rocker is effectively jammed and the pushrod cant go anywhere. As the cam tries to turn still the lobe is forced against the pushrod, and results in knackered pushrod + knackered cam lobes. In extreme cases it can even transfer sufficient force back to the little end bearings that they get damaged as well.
On the positive outlook, it might be ok.
On the positive outlook, it might be ok.
If i were you i would get a recon engine and ask a friendly mechanic to fit it, a lot cheeper to do that than strip the head of for a rebuild and mabe take the block out if there is any bottom end work, if you fit a new engine you will have one to strip for fun... I know im sad
Campbell
Campbell
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