Rocker arm adjusting

BTOLER

MEMBER
2007 GMC SIERRA
5.3L
V8
4WD
140,000 MILES

I have the truck listed above SLT with a Vortec engine. I took the heads off because of a blown head gasket and had the heads checked and fixed. I am putting new lifters in and was wondering if the rocker arms need to be adjusted or just tongue down to specs?

Thanks,
Bethel Toler

5 Replies

PATENTED_REPAIR_PRO

MECHANIC
1,853 POSTS

No valve adjustment is required.
Here is the entire procedure.
VALVE ROCKER ARM AND PUSH ROD INSTALLATION (RPO LY2/LH6/LMG/LY5/LC9)
Fig 1: View Of Valve Rocker Arm Pivot Support
GM260141
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
When using the valve train components again, always install the components to the original location and position.
Valve lash is net build. No valve adjustment is required.
Lubricate the valve rocker arms and pushrods with clean engine oil.
Lubricate the flange of the valve rocker arm bolts with clean engine oil.
Install the valve rocker arm pivot support.
Fig 2: View Of Pushrods
GM260142
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure the pushrods seat properly to the valve lifter sockets.
Install the pushrods.
Fig 3: View Of Rocker Arms & Bolts
GM260140
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
Ensure the pushrods seat properly to the ends of the rocker arms.
DO NOT tighten the rocker arm bolts at this time.
Install the rocker arms and bolts.
Fig 4: View Of Camshaft & Crankshaft Sprocket Alignment Marks In 12 O'clock Position
GM1658282
Courtesy of GENERAL MOTORS CORP.
Rotate the crankshaft until number 1 piston is at top dead center of compression stroke.
In this position, cylinder number 1 rocker arms will be off lobe lift, and the crankshaft sprocket key will be at the 1:30 position. The camshaft and crankshaft sprocket alignment marks (1, 2) will be in the 12 o'clock position. If viewing from the rear of the engine, the additional crankshaft pilot hole, non-threaded, will be in the 10:30 position.

The engine firing order is 1, 8, 7, 2, 6, 5, 4, 3.

Cylinders 1, 3, 5 and 7 are left bank.

Cylinders 2, 4, 6, and 8 are right bank.

NOTE: Refer to Fastener Notice.
With the engine in the number 1 firing position, tighten the following valve rocker arm bolts:
Tighten:

Tighten the exhaust valve rocker arm bolts 1, 2, 7, and 8 to 30 N.M (22 lb ft).
Tighten the intake valve rocker arm bolts 1, 3, 4, and 5 to 30 N.M (22 lb ft).
Rotate the crankshaft 360 degrees.
Tighten the following valve rocker arm bolts:
Tighten:

Tighten the exhaust valve rocker arm bolts 3, 4, 5, and 6 to 30 N.M (22 lb ft).
Tighten the intake valve rocker arm bolts 2, 6, 7, and 8 to 30 N.M (22 lb ft).