Cam out of Round? Cam gear out of round?
09-26-2011, 07:31 PM
#1
Cam out of Round? Cam gear out of round? i installed the camshaft and timing set per spec. i put a dial indicator on my camshaft gear to check for deflection. i got .008 deflection on my dial indicator. what i did was set up my dial indicator so it was touching the machined face of my new cam gear just below the cam gear teeth and chain. i rotated the cam gear 360* degrees, checking my dial indicator the whole time. in a 360* rotation i get .008 of deflection. i checked the crank gear the same way and get .001-.002 deflection (.001-.002 on crank gear is within manufacture specs). I don't think .008 is within spec. can anyone help me with this?
im not the only one who has checked my crank gear and cam gears (timing set) for deflection am I?
im not the only one who has checked my crank gear and cam gears (timing set) for deflection am I?
09-26-2011, 10:45 PM
#2
TECH Senior Member
iTrader: (96)
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,240
Likes: 0
Received 79 Likes
on
70 Posts
There was just a post on this within the last 2 weeks or so. OP ended replacing the timing set and the issue resolved itself. Maybe there is a bad batch floating around.
09-26-2011, 11:58 PM
#3
Just for brain food. Remember you have camshaft end play, playing a factor here. As your rotating, that cam isn't staying perfectly still in the bore. Ideally you would want to start your measurements with putting the gear on a surface plate and running a dial test indicator across the machined surface, just below the gear teeth. At that point your relying on the machined "hub" being flat (or parallel depending on which way you look at it, and how you measure), so you have to analyze that as well. We're talking about runout here, not O.O.R. conditions.
Last edited by Havoc40; 09-27-2011 at 12:14 AM.
09-27-2011, 12:13 AM
#5
09-27-2011, 12:15 AM
#6
Just for brain food. Remember you have camshaft end play, playing a factor here. As your rotating, that cam isn't staying perfectly still in the bore. Ideally you would want to start your measurements with putting the gear on a surface plate and running a dial test indicator across the machined surface, just below the gear teeth. At that point your relying on the machined "hub" being flat, so you have to analyze that as well. We're talking about runout here, not O.O.R. conditions.
does anyone else have an LS on a stand or in the car with the timing cover off and can measure your cam gear run out for me?
