timing chain issues
Thread Starter
Teching In
Joined: Apr 2011
Posts: 43
Likes: 0
From: League City, Texas
timing chain issues I just got my 408 short block back from the machine shop and started putting it together and started having an issue with the cam gear. The motor turns freely before instaling the timing set but after I install the timing set and torque it to spec the motor will not turn over. (I have the comp double roller set) Just wondering if anyone else has had a simular issue, and what you did to correct it, any help would be greatly appreciated, thanks guys.
Thread Starter
Teching In
Joined: Apr 2011
Posts: 43
Likes: 0
From: League City, Texas
I think have come to the conclusion that one of two things are happening, 1)the inside shoulder of the cam gear where the torrington bearing sits is rubing on the cam retaining plate or 2)the cam is sucked up against the back of the retaining plate not allowing it to turn.
Can't remember exactly, but there was a thread a year or so back about certain bolts being too long and causing interference when tightened, if the correct bolts were mistakenly used somewhere else... Have you tried just the gear w/o the chain? Or turning the cam with just the retainer plate installed?
Thread Starter
Teching In
Joined: Apr 2011
Posts: 43
Likes: 0
From: League City, Texas
I have thought of the head of the stock bolts on the retaining plate sticking out too far and rubing the back of the cam gear but there are no marks on the back of the gear and I can see through the holes on the cam hear and can see that the bolts are not touching close but not touching. Yes sir I have tried without the chain and the cam will not turn.
Just the bare cam without lifters and pushrods? Can you turn the cam without the retainer plate? If so, it would have to be something in the retainer plate area. If not, the cam bearings...
I have thought of the head of the stock bolts on the retaining plate sticking out too far and rubing the back of the cam gear but there are no marks on the back of the gear and I can see through the holes on the cam hear and can see that the bolts are not touching close but not touching. Yes sir I have tried without the chain and the cam will not turn.
I have thought of the head of the stock bolts on the retaining plate sticking out too far and rubing the back of the cam gear but there are no marks on the back of the gear and I can see through the holes on the cam hear and can see that the bolts are not touching close but not touching. Yes sir I have tried without the chain and the cam will not turn.
Trending Topics
Restricted User
Joined: Jun 2003
Posts: 588
Likes: 0
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
Restricted User
Joined: Jun 2003
Posts: 588
Likes: 0
Restricted User
Joined: Jun 2003
Posts: 588
Likes: 0
I have thought of the head of the stock bolts on the retaining plate sticking out too far and rubing the back of the cam gear but there are no marks on the back of the gear and I can see through the holes on the cam hear and can see that the bolts are not touching close but not touching. Yes sir I have tried without the chain and the cam will not turn.
Thread Starter
Teching In
Joined: Apr 2011
Posts: 43
Likes: 0
From: League City, Texas
Sorry guys I have been working my a** off, thanks for the help. I didn't have any issues putting the cam in and then after the cam is in it has no problem turning freely, only until I tighten down the cam gear to the cam and then the cam will it not turn, is there any difference between retaining plates from different year motors?
Sorry guys I have been working my a** off, thanks for the help. I didn't have any issues putting the cam in and then after the cam is in it has no problem turning freely, only until I tighten down the cam gear to the cam and then the cam will it not turn, is there any difference between retaining plates from different year motors?
If the cam is in and turns freely and smoothly without the chain installed then the cam bearings aren't the problem. I would say you have the wrong retainer plate and cam gear setup. If it does not turn freely with the cam gear and retainer installed and the chain off the gear then there is simply something not right with your cam gear and retainer.
Thread Starter
Teching In
Joined: Apr 2011
Posts: 43
Likes: 0
From: League City, Texas
Yes I have narrowed it down to the cam gear and the retaining plate, nothing is wrong with the cam bearings, I was worried about the bearing on the back of the cam gear getting in a bind against the retaining plate not allowing it to move. I was just seeing if anyone had a simular issue, I will have to tryusing a retaining plate from a newer motor with countersuck bolts, because right now I'm using a plate from a 5.3 I had laying around.
