streetzlegend

iTrader: (8)

Well I recently got a DEK to swap into my car, i was inspecting the motor, took off the valve covers, and the RH head, the buckets for two exhaust valves are broken. Basically, it looks like the buckets are two piece, the actual bucket shape, and then the shiny disk ontop of it that the cam lobe push on, well the buckets themselves are still in place (but bent since it looks like the cam pushed into it), thing is, the disk the cam pushes on are broken off, one was disk is sitting on the side of the head, with the little thin ring that holds in broken off, and the other disk is wedged against the head's wall and the cam's lobe. (pictures coming soon), I am going fight this with the seller of the motor, but I am curious as to what can possibly cause this to happen? how can those disk come off the buckets? I cant think of any situation where it would do this. Maybe chain broke or something caused the piston to hit the valve? any input will be appreciated






thanx

JSutter

iTrader: (46)

the disks are shims, they just sit there. how they fell out with the cams in place is beyond me. did the valve springs break?

streetzlegend

iTrader: (8)

I dont know if the springs broke, I havent taken anything off. I contacted the seller so i dont wanna mess with the engine and leave it as is.

so the disk on top of the bucket are the shims? isnt the shim supposed to be attached to the bucket (whether it be by being pressed in or welded, who knows.

streetzlegend

iTrader: (8)

now that this engine in like this, i have a question. Is it possible that this engine could still be ran? the reason i ask is because the seller is telling me that the engine was running fine, he even test drove the car before pulling the engine (the car had been left by the owner, was not able to pay transmission fix, so they parted it out). I called the seller, told me it ran fan, nothing he can do.

pmohr

iTrader: (26)

On the VQ35s the shim buckets are one piece, on the VQ30 you can change the shims without having to replace the entire piece.

t6378tp

iTrader: (69)

my 1st guess would be that donor car was in a front end collison and the guy is not giving up all the info

doublea

iTrader: (7)

This engine cannot be driven anymore, otherwise it will create even more damage. The disk on top of the bucket is supposed to turn freely but not supposed to come off the bucket, it simply turn by the action of the cam spinning.

DandyMax

iTrader: (7)

Definitely don't run the engine! Was it modified in any way or repaired? Several things are possible but a broken/improperly set timing chain resulting in the piston slamming the valve assembly into the cam lobe could do that. If that's the case the valves will probably be bent also. Improper shim selection (clearances too tight) might also do that, especially on the exhaust side b/c of thermal expansion.

streetzlegend

iTrader: (8)

I was speaking with few buddies, and since i already have the engine, instead of going on and buying new one, ill try to use it. now, if i take off these heads, and pistons arent damaged can i just put my old heads on this motor? Or are there other things that i risk by doing so?

streetzlegend

iTrader: (8)

Ok, so I am going to take off the heads this week, if pistons arent damaged old heads are going on.

allblackmax96

iTrader: (4)

when i first got my 3.5 i wasn't aware of the large amount of oil consumption and ran 2 quarts low and ended up with "lifter tick" , i ended up having excessive clearance(about 10thousands of an inch) on the exhaust valves on cylinder 5.....

maybe that bucket is frozen in the head and the pressure from the cam lob broke the shim right off... just an idea

BTW i think if the timing was off, you would have multiple cases of broken shims

DandyMax

iTrader: (7)

^^^ Also good points... because reading is fundamental and he said only 2 broken.. hmm... oil starvation or incorrect clearance are more likely than timing chain in that case.

streetzlegend

iTrader: (8)

I am going to inspect this motor more. i am going to see if bearings are good, hopefully they are but if there was in fact oil starvation, who knows.