Torque Specs for New Cam Upgrade
Thread Starter
Burning Brakes
Joined: Oct 2005
Posts: 791
Likes: 2
From: Stafford Virginia
Torque Specs for New Cam Upgrade
Does anyone know all the associated torque specs for replacing a cam in an LS2? Banlancer bolt, rocker arms, etc...
Also what is the deal with tightning "Torque to Yeild" bolts verses just using a torque wrench set to a specific setting?
Thanks,
Also what is the deal with tightning "Torque to Yeild" bolts verses just using a torque wrench set to a specific setting?
Thanks,
Instructor
Joined: May 2007
Posts: 211
Likes: 0
From: Mountain View CA
IIRC, torque to yield means that the bolts get torqued to the point that the threads on the bolt stretch a little bit versus just torquing to a set number of ft/lbs. These types of bolts are typically not reusable.
Correct me if I am wrong...I don't turn wrenches anymore...Hurray for back problems at an early age!
Correct me if I am wrong...I don't turn wrenches anymore...Hurray for back problems at an early age!
Instructor
Joined: May 2007
Posts: 211
Likes: 0
From: Mountain View CA
The only time I've personally handled TTY bolts was when I was fastening down a cylinder head (head bolts). You do it in several stages. As in if you had, say, 6 bolts, you would tighten them down to a certain minimum amount of torque (pre-load or snug torque), then progressively tighten each bolt a little bit at a time (to apply even torque across the block). You'd measure by the amount of degrees you turned the bolt. Say 90 degrees for each bolt, then back to the first bolt, another 90 for each, then a final 70 for each...Depends on the bolt though...Consult others on here for the specific application you are dealing with though, haha.
By the way, the point of this process is to insure that friction doesn't cause uneven bolt loading and you get an even tension and clamping on whatever you are bolting down.
By the way, the point of this process is to insure that friction doesn't cause uneven bolt loading and you get an even tension and clamping on whatever you are bolting down.
Last edited by Keaka26; Sep 25, 2007 at 01:49 PM.
Drifting
Joined: Jul 2000
Posts: 1,818
Likes: 3
From: SoCal
The specs on might site should be the same or close for all LS engines, at least for things involved in the cam swap. Only the crank bolt and the head bolts are torque to yield, and you don't need any fancy wrenches for that, just mark the head of the bolt with a line, and then turn and approximate the degrees. It's pretty easy to eyeball 90 degrees.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Torque all M11 bolts to 22 ft/lbs
First pass: torque all M11 bolts in sequence 90 degrees
Sec Pass: torque all M11 bolts in sequence 70 degrees
doing this is pretty easy, after torq to 22 ft/lbs use a sharpie and scribe a horizontal line across each bolt head. Once you torq to 90 degrees you know the line is vertical, then make the last pass to 70 degrees, you know what 45 looks like so estimate the rest, if its within a degree or two its close enough.
Finally torque all 8mm bolts in sequence 22 ft/lbs
Rocker arms: 22 ft/lbs
Exh manifold bolts: 18 ft/lbs
Oil Pump bolts: 18 ft/lbs
Cam sprocket bolts: 26 ft/lbs
Cam retainer bolts with 8mm hex: 18 ft/lbs
Cam retainer bolts with torx: 11 ft/lbs
Intake manifold:
first pass in seq 49 in/lbs
sec pass in seq: book says 89 in/lbs from experience better to torq to 70 in/lbs I have found that sometimes the intake bolt stanchions begin to crush at 89 in/lbs
New Crankshaft balancer bolt: after installing balancer with installation tool, use old bolt and torq to 240 ft/lbs to insure that the balancer is seated. The with a new bolt in place torq to 37 ft/lbs, then torq to 140 degrees.
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Instructor
Joined: Aug 2005
Posts: 146
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From: oceanside N.Y.
Just a point of information.If you go to Eliteengineeringusa.com.they list all the torque specs for a C6........Plus they are a great bunch of guys I have used their products and find they offer high quality parts as very reasonable prices..........What a combo......
Thread Starter
Burning Brakes
Joined: Oct 2005
Posts: 791
Likes: 2
From: Stafford Virginia
