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so now i have a few questions but 1st a little about the car
01 c5z h/c/i full bolt'ons rpm lv5 trans built diff 3.90 gear 475/415 rw n/a 599/600 on a button
1st whats a good chain to replace it with? this was replaced with stock when cam was installed less then 10k miles on it
2nd whats the chances my valves survived?
how you ask? well it was late night on an open freeway speed shifted 3rd to 4th and the engine died, when cranking it over trying to figure out what happen i didnt hear any clicking or banging?
EDIT: Pulled the heads from what I can see 7 valves are bent, a few pistons have some lips stick from where the valves kissed not sure if there still good? haven't ripped the timing cover off at this point, pics was taken after a wd40'd the cylinders will update once i get to the timing chain....
Last edited by Stroker87; Oct 5, 2017 at 08:43 PM.
i think the engine survived (fingers crossed) we cranked it a few times to listen and dont hear any knocking or banging, im thinking just to pull the heads and check them to make sure tho...
yeah it was a stock ls2 timing chain that let go so im going aftermarket this time, lesson learned
do i need to do a gear set or just can do a chain?
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
if you can get your hands on a borescope it may not be a bad idea to take a look at the pistons and make sure they don't have any marks or damage... you can reuse the stock gear set if you get the c5r chain, that's what I did and it's been going strong since or if you get the other chain mentioned it comes with a new gear set
Not hard, but best to buy the correct Kent-Moore tool from ebay.
Cranking now won't provide any indication of bent valves and may actually do more damage since the valves can't move out of the way of the pistons. A quick and dirty check would be to pull the valve covers and rockers, check for valves that aren't up all the way.
Not hard, but best to buy the correct Kent-Moore tool from ebay.
Cranking now won't provide any indication of bent valves and may actually do more damage since the valves can't move out of the way of the pistons..
your talking about the "J-41558 Crankshaft Sprocket Remover" ? hate to spend $90 on a tool that i probably wont use more then 1 time, if the gears are in good shape and the c5r chain is a good replacement i might just go that route if not it is what it is
if there was damage done it was done when i was on the side of the road trying to start it, i already pulled the passenger valve cover gave it a quick crank and seen none of the rockers moved
now im worried about if when it let go any small peaces of it fell in the oil pan really not up for pulling the engine to drop the pan
YouWILL have bent valves!! Better start planning on at least ALL the exhaust and the pushrods. TRUST me o that one..
Remove the heads. Pour solvent in the head combuston chamber. If the solvent keaks out, BENT VALVES! You can look in the intake and exhaust runners and see what leaked!
BC
Last edited by Bill Curlee; Oct 1, 2017 at 11:45 AM.
yeah its starting to sink in, this morning i was thinking ever time i gamble i loose so just pull the heads and have then looked over by a shop now just hoping the pistons are good and the timing chain was a clean brake with out and small peaces in the oil pan
yeah its starting to sink in, this morning i was thinking ever time i gamble i loose so just pull the heads and have then looked over by a shop now just hoping the pistons are good and the timing chain was a clean brake with out and small peaces in the oil pan
Unless you have ZO6 Sodium filled exhaust valves, the valves are pretty tough and usually dont break. The sodium filled exhaust valves usually break off.
The pistons (if the valves dont break) will have small smiley Faces on them but not really any damage. Just buff off the area, look for any high spots, sand FLAT and keep on keeping on!!!
AGAIN,,, Make SURE the pushrods are not bent!
BC
Last edited by Bill Curlee; Oct 1, 2017 at 12:27 PM.
I had bent valves when my timing chain broke. Pretty sure ls's are an interference engine and if valve timing is out, you bend stuff. I have the chain linked earlier in this thread. Things but great time to upgrade!
your talking about the "J-41558 Crankshaft Sprocket Remover" ? hate to spend $90 on a tool that i probably wont use more then 1 time, if the gears are in good shape and the c5r chain is a good replacement i might just go that route if not it is what it is
if there was damage done it was done when i was on the side of the road trying to start it, i already pulled the passenger valve cover gave it a quick crank and seen none of the rockers moved
now im worried about if when it let go any small peaces of it fell in the oil pan really not up for pulling the engine to drop the pan
Wow, I bought mine years ago but don't remember paying anywhere near that much.
How were you driving the car when it broke. The LS1 has some internal harmonics that will result in chain wrap at higher RPM. Not usually an issue rowing through the gears but can happen when downshifting at high RPM such as autocross type driving.
The chain can fail due to wrap but it can also happen with a bad harmonic damper. The ASP harmonic dampers were known for this.
Not sure what you have for a harmonic damper but you may want to evaluate replacement while its off the car. Also, a timing chain damper will eliminate the chain wrap issue.
If you reuse the old timing chain sprockets, make sure to do an inspection per the service manual.
Last edited by vettenuts; Oct 2, 2017 at 07:34 AM.
I would go for a whole new set of heads. When you bend valves, you damage the valve guides too. There is no source to replace the OEM sintered valve guides. Bronze is typically used as a replacement and won't have near the longevity.
if the heads can be reused they will be im not springing for another set or ported heads, i have a machine shop that does awesome work and i trust very much so if he says they can be reused i will
this is not going to snowball into a new engine (I hope) lol
timing chain...
