Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 954 (3.5L ENGINE (SERVICE INFORMATION))ROCKER ARM SHAFT/ROCKER ARM/LASH ADJUSTERINSTALLATION

2004 Toyota Matrix XR, FWD, Standard

Rocker Arm Shaft/Rocker Arm/Lash Adjuster: Installation

2004 Toyota Matrix XR, FWD, StandardSECTION Installation

WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Rocker arm and shaft assembly can be installed either prior to or after (preferred) cylinder head installation.

.Rotate camshafts to the position shown in (Fig 1 ). With the camshafts in these positions the lobes are in a neutral position (no load to the valve). This will allow the rocker arm shaft assembly to be tightened into position with little or no valve spring load on it.

Fig 1: Identifying Camshaft Gear Timing Marks
Courtesy of DAIMLERCHRYSLER CORP.
Install the rocker arm and shaft assembly making sure that the identification marks face toward the front of engine for left head and toward the rear of the engine for right head.
Tighten rocker arm/shaft assembly bolts in sequence to 31 N.m (275 in. lbs.) (Fig 2 ).

Fig 2: Rocker Arm/Shaft Assembly Bolt Torque Sequence
Courtesy of DAIMLERCHRYSLER CORP.
Install cylinder head covers. (Refer to CYLINDER HEAD COVER(S) - INSTALLATION )

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.