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 MANUALSGEO1991TRACKER LSI, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL1.6L 4-CYL - VIN [U]REMOVAL & INSTALLATIONROCKER ARM ASSEMBLY SERVICE
1991 Geo Tracker LSi, Automatic
Rocker Arm Assembly Service
1991 Geo Tracker LSi, AutomaticSECTION Rocker Arm Assembly Service
- Disassemble rocker arm shaft assemblies. Inspect components for damage.
- Measure O.D. of rocker arm shaft in rocker arm operating areas. Measure I.D. of rocker arm. Determine oil clearance. Replace components if not within specification. See ROCKER ARM ASSEMBLY SPECIFICATIONS table.
- Using dial indicator and "V" blocks, check rocker arm shaft runout. Replace shaft if runout exceeds specification. See ROCKER ARM ASSEMBLY SPECIFICATIONS table. To reassemble, coat components with engine oil and reverse disassembly procedure.
ROCKER ARM ASSEMBLY SPECIFICATIONS
| Application | In. (mm) |
|---|---|
| Rocker Arm I.D. | .629-.630 (15.98-16.00) |
| Rocker Arm I.D. (1991) | .630-.631 (16.00-16.02) |
| Rocker Arm Shaft O.D. | .628-.629 (15.95-15.98) |
| Rocker Arm Shaft Oil Clearance | .0005-.0017 (.012-.044) |
| Rocker Arm Shaft Runout | .0047 (.119) |
RENDER: 1.0x
NO RELATED
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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.