12thstreetjunkman

iTrader: (16)

I have roughly 500 miles on my cam swap, was having oil pressure problems so pulled things back apart. The back of the timing gear is pretty chewed up, and the cam retainer plate is all chewed up, where they have been rubbing together. The gear and retainer bolts were still tight There is a pretty deep groove worn in the retainer, and you can see where the bolt heads were starting to rub the cam sprocket a bit. All this rubbing made shavings that has chewed up the cam bearings. The cam still looks new, but I am going to send it back to thunder just to make sure I havn't messed it up too. I popped the rod caps off, and the rod bearings still look good, but have some scores from the shavings too. Anyone have any Idea what I have done wrong for this to have happened?

oange ss

iTrader: (50)

http://www.vincihighperformance.com/...20PAGE%20.HTML

12thstreetjunkman

iTrader: (16)

I have read that, and will use the tips on the rebuild, but still wondering why this happened this time, when I put the cam in, there were no signs of wear at all, now there is a deep groove in the retainer & gear.

oange ss

iTrader: (50)

i have never actually heard of anyone havin that problem,

12thstreetjunkman

iTrader: (16)

Me neither I would take some pictures but my camera doesn't work very good up close.

blackboostedinfla

Anyone heard of this happening with Rollmaster double roller timing chain setup.

oange ss

iTrader: (50)

was the oil pressure problems slight pressure drop, but recovering by itself or fluctuating needle, intermittently ?

2xLS1

iTrader: (25)

Although the cam retainer bolts and cam sprocket bolts look similar, they are slightly different and have different specs and part numbers. When you did the cam swap, did you keep them separated and put them back where they belong?

Teutonic Speedracer

iTrader: (20)

I just put oil slots in my cover like they showed on Vinci while I have it all apart.

12thstreetjunkman

iTrader: (16)

Since the cam swap, it has not really had "great" oil pressure. The motor only had 15,000 miles so I didn't mess with porting the pump, but I did shim it. I didn't have the pickup apart, so I knew it wasn't a pinched or torn oring. I drove it a hundred or so miles, pretty easy. Made 7 pulls on the dyno, In the following days the oil pressure kept dropping off when warm until I would only have about 25psi when reving a bit. It wasn't knocking or sounding abnormal. I cut the oil filter apart and noticed more than normal metal so I tore it down. None of the bearings look bad from wear, just scraped up from the shavings. It is possible I put the cam bolts in the retainer, or vice versa, but they look the same to me, and everything was still good and tight. What supplies oil to this area?? Thanks for the replies.

99blancoSS

iTrader: (115)

No wear here when I did mine. Maybe you got the bolts wrong. I bagged and labeled all my stuff to not make that mistake. Jeeez Vinci really gets into the propoganda. If I listen to them I'd have to spend another 4k to make my car right.

vettenuts

iTrader: (4)

Did you change your timing set/chain? Sounds like you had an abnormal amount of thrust load. This could also be caused by the lobes on the cam. The other question is was the low oil pressure the symptom or the cause?

12thstreetjunkman

iTrader: (16)

I did not change the timing set, just reused the stocker, the motor had really low mileage, and I wasn't planning to put more than 7,000 miles a year or so on the car so I felt it wasn't necessary. I agree with the thrust load, just not for sure why, everything went back together smoothly, and it wasn't making a lot of racket to indicate a problem. I am going to try to borrow a camera to better show what I am talking about. It seemed dryer than I thought it would have inside the timing cover, maybe it isn't properly getting oiled?

vettenuts

iTrader: (4)

I would also check your cam lobes when you remove it to make sure they are square to the centerline.

12thstreetjunkman

iTrader: (16)

I tried taking a couple of pictures, but the camera just wont show it clear enough to see what is going on, I tore it completely down today, and you can also see where the back of the cam has rubbed the rear cover plate? Any insight is appreciated.

Black Z/28

Did you remember hearing any noise coming from the timing set area while it was running? You would think if it was rubbing like that it would have been audible.

oange ss

iTrader: (50)

too much fore and aft movement of the cam is the only explaination, the only question is, how ? good luck man

ineedashortblock

iTrader: (3)

Checking to see if there was any update on this? Just put my motor back together after seeing this symptom on my last blown motor.. looking for a way to prevent it now.

ineedashortblock

iTrader: (3)

Bump. 2 years later.