i got my DOHC s13 towed to my house the other day when it wouldn't start. i took off the valve cover to check the cam timing and the exhaust cam sprocket somehow twisted. i didn't notice it from looked at the front, but from the top, the cam sprockets were not parallel. its hard to explain.it looked like this from the top-intake sprocket on the left, exhaust on the right= \\except the exhaust sproket was only tilted like 1/4 that much. this obviously is the reason my car would not start.
so i took off the bolt, straightened the sprocket, made sure the pin was in the slot, and tightened the bolt back to 130 ft.-lbs. it looks like it's on correctly, but its on the same way i had it on last time when it loosened up. is there supposed to be some sort of bearing or washer between the bolt head and the sprocket? if not, does anyone have any ideas/suggestions? thanks.
s13 cam sproket twisted -> car died
i didn't feel anything. i was worried about this too when i saw the broken camshaft. if a valve hit a piston, i would have felt it, right?
also, recently my top chain guide (the one between the cam sprockets) broke so i took it out. i talked to some guys that run without it, so i thought it would be alright for me to not replace it. the guide broke like a week before the camshaft broke. now, did the camshaft break because the guide was not there? or... did the guide and camshaft break because of some other reason?
thanks NISTECH
-Brandon
also, recently my top chain guide (the one between the cam sprockets) broke so i took it out. i talked to some guys that run without it, so i thought it would be alright for me to not replace it. the guide broke like a week before the camshaft broke. now, did the camshaft break because the guide was not there? or... did the guide and camshaft break because of some other reason?
thanks NISTECH
-Brandon
the guide is very common to break. the manufacturer no longer makes upper guide. It was determined it was not needed. but if it was resting on your chain and bound between the cam gear and the valve cover it could have put stress on the shaft. but it not being there wouldnt have caused it. no you would not nessesarily heard or felt it hit when it happened.
best way to tell if you have a bent valve without a leak down tester is to remove the cam shaft completely and look carfully at all your valve spring heights. If they are not perfectly even all the way across the ones that are lower are bent.
best way to tell if you have a bent valve without a leak down tester is to remove the cam shaft completely and look carfully at all your valve spring heights. If they are not perfectly even all the way across the ones that are lower are bent.
HEy splitzThe same exact thing happen to my exhaust cam when i put my new head on. Btu i think it was maybe because i didnt tighten the bolt to specific amount of torque. anyone know exactly what are the sec torque for both cams.
But anyhow i did tighten it hard but u never know. Check if the screw was loose ro anything. and make sure you check ur intake cam too. my intake cam cracked in the same spot but didnt get to brake off.
HOw can the chain be to stressed? im tryin to figure out exactly why it happen because i got new cams already and dont want the same thing to happen. ThanksAlex
But anyhow i did tighten it hard but u never know. Check if the screw was loose ro anything. and make sure you check ur intake cam too. my intake cam cracked in the same spot but didnt get to brake off.
HOw can the chain be to stressed? im tryin to figure out exactly why it happen because i got new cams already and dont want the same thing to happen. ThanksAlex
which bolt are you referring too? the cam sprocket bolt? yeah, i tightened it with a torque wrench to 125 ft-lbs like it says in the FSM. if you're talking about the cam bearing cap bolts, i didn't even take them off so they were still torqued down from the factory.
i would also like to know why the cam broke so i can avoid it when i get a replacement. when i began hearing the odd clicking noise when my upper guide broke, i didn't drive the car. i let it idle for probably a total of two minutes. i don't think it was because of the guide that the cam broke. anyone have any ideas? thanks.
-Brandon
i would also like to know why the cam broke so i can avoid it when i get a replacement. when i began hearing the odd clicking noise when my upper guide broke, i didn't drive the car. i let it idle for probably a total of two minutes. i don't think it was because of the guide that the cam broke. anyone have any ideas? thanks.
-Brandon
Brandon i mean the bolt that holds the sporket( where the timing chain goes connected to on the cam) to the cam. THe bolt that holds the sporcket together with the cam.
I dont know exactly why it broke or how it broke but i got a set of cams so know im gonna torque it down correctly and hopefully they dont break again.if i figure out why they broke ill post it here
I dont know exactly why it broke or how it broke but i got a set of cams so know im gonna torque it down correctly and hopefully they dont break again.if i figure out why they broke ill post it here