How to install the valve pushrods and valve rocker arm assemblies correctly on GMC Jimmy?

Before installing the valve rocker arm supports maintain an upwards position of the arrow on the valve rocker arm support. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent to three main contact areas of valve rocker arms: valve pushrod socket , roller pivot , and valve stem tip . Start by installing the bolt at positions and before moving to and then continue with all valve rocker arm bolts. During this step proceed to position the number 1 cylinder at top dead center (TDC) compression stroke while keeping crankshaft balancer marks properly aligned with the front cover tabs. The installation requires proper fasteners to be used exactly where specified because replacement fasteners must match their specified part numbers. Use paint and lubricants or corrosion preventives only when directed because they may alter the clamping force and torque measurements. Correct fastener sequence along with tightening specifications must be followed to avoid damage to the components. The installed valve rocker arm assemblies require torque at 30 Nm (22 ft. lbs.) and subsequent valve lash adjustment will not be needed.

OEM GMC Jimmy Rocker Arm

Engine Rocker Arm

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4 Rocker Arms found

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GMC Jimmy Rocker Arms Part Number: 23500074
$19.84 MSRP: $32.68
You Save: $12.84 (40%)
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Product Specifications
- Other Name: Arm, Engine Valve Rocker; Rocker Arm
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1991 GMC Jimmy | Base, High Sierra, Sierra Classic | 8 Cyl 6.2 L DIESEL
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GMC Jimmy Rocker Arms Part Number: 10089648
$27.98 MSRP: $43.85
You Save: $15.87 (37%)
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Product Specifications
- Other Name: Arm Kit, Valve Rocker; Rocker Arm; Arm Kit, Engine Valve Adjusting & Rocker; Ball, Engine Valve Adjusting.
- Replaces: 12528897
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1993 GMC Jimmy | Base, High Sierra, Sierra Classic, SLE, SLS, SLT | 6 Cyl 4.3 L GAS, 8 Cyl 5.0 L GAS, 8 Cyl 5.7 L GAS
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GMC Jimmy Rocker Arms Part Number: 12599650
$57.50 MSRP: $90.07
You Save: $32.57 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Arm, Valve Rocker; Rocker Arm; Arm, Engine Valve Rocker
- Replaces: 12555580
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2000-2001 GMC Jimmy | Diamond Edition, Envoy, SL, SLE, SLS, SLT | 6 Cyl 4.3 L GAS
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GMC Jimmy Rocker Arms Part Number: 12522105
Product Specifications
- Other Name: Arm Kit, Valve Rocker; Rocker Arm; Arm Kit, Engine Valve Rocker
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1999 GMC Jimmy | Base, Envoy, SL, SLE, SLS, SLT | 6 Cyl 4.3 L GAS

GMC Jimmy Rocker Arm

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Rocker Arm used in GMC Jimmy model's engine is the small component that helps the motion from the pushrod, which in turn rotates and opens or closes the intake or the exhaust valve. Generally made of stamped steel or aluminum, it rotates, translating the back and forth movement of the pushrod to up and down to perform the actuands of the valves. Although Rocker arms come in different types; Roller rockers with needle bearings are used to minimize friction and wear mostly when racing at high RPM. For today's engines, the rocker ratio that defines the relationship between the movement of the valve and that of the pushrod varies from 1.5 to 1.8:1, thus affecting engine performance. New fulcrum bearings are also crucial in engines with high-RPM since they are subjected to more stress to ensure better performance and durability.

GMC Jimmy Rocker Arm Parts and Q&A

Rocker Arms
12599650
Q: How to install the valve pushrods and valve rocker arm assemblies correctly on GMC Jimmy?
A:
Before installing the valve rocker arm supports maintain an upwards position of the arrow on the valve rocker arm support. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent to three main contact areas of valve rocker arms: valve pushrod socket , roller pivot , and valve stem tip . Start by installing the bolt at positions and before moving to and then continue with all valve rocker arm bolts. During this step proceed to position the number 1 cylinder at top dead center (TDC) compression stroke while keeping crankshaft balancer marks properly aligned with the front cover tabs. The installation requires proper fasteners to be used exactly where specified because replacement fasteners must match their specified part numbers. Use paint and lubricants or corrosion preventives only when directed because they may alter the clamping force and torque measurements. Correct fastener sequence along with tightening specifications must be followed to avoid damage to the components. The installed valve rocker arm assemblies require torque at 30 Nm (22 ft. lbs.) and subsequent valve lash adjustment will not be needed.