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Re: timing chain broke
Hello,Bad Luck with timing chain failure,
Sorry to bear bad news but as far as I know Gm engines are NOT safe i.e. the valve miss pistons. It sometimes isn't too severe if very low rev's i.e. tickover, usually 2 or 3 exhuaust and same inlet. Let's hope no seats.
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bent push rods could have been caused when the chain broke and not from the chain been replaced wrong or the timing out.
if the engine was running when the chain broke the cam would have stopped leaving all the valves in the same positon as the mometum of the fly wheel continued to turn the pistons in the cylendars could hav come up and hitting the valves and bending the push rods. and or damaging the cylendar head.
recommend removing the head and have it checked for damage, as well as replacing the bent push rods, and cylendar gaskit. once the head is checked and the valves are seated well. then replace and follow instructions in the set up for the pistons and cam prior to replacing the chain and setting the timing.
Very rare that a chain breaks. I'd replace the chain and before closing it up, turn the engine by hand and see if anything is binding or frozen in the valvetrain. Also look carefully at the valve springs to make sure that no valves have bent. (if bent, most times the spring will not return to normal height)
well the plastic piece are from the timing chain guides are either broken or ripped off,and the metal rattling was probably the timing chain,,i think the timing chain jmped or broke and broke the guides,if thats the car you most likely bent the valves in the head,,,i would remove the cam cover and the timing chain cover and see what you got,you may need a engine
It definately sounds as though you've got your cam gear set 180 degrees off.When your timing is at top dead center your crankshaft will be at TDC on the guage, the cam gear will have both of the lobes at 10:00 and 2:00 away from the surface of the valve they serve on the number one cylinder. This can only be see if the valve cover is removed, which at this point I'm sure it is. Thank you, Dana
If the chain broke at highway speed then you have probably bent valves too. Does the motor spin fast? If it sounds different cranking then it may have bent valves. You can do a compression test to find out for sure. Good Luck
if this engine is an interference fit engine, there is a good chance that the valves are bent, if you are sure that timing is correct, this is the most likely cause for no compression in this case, did you run a compression test? if you think the valve are bent you can check by removing the rockers and look at the valves. they should all look the same, I have been able to see a bent valve due to the height of the stem compared to others in the head.