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 MANUALSTOYOTA20034 RUNNER 2WD V6-4.0L (1GR-FE)REPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINETIMING COMPONENTSTIMING CHAIN
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)
Timing Chain
2003 Toyota 4 Runner 2WD V6-4.0L (1GR-FE)SECTION Timing Chain
Chain
Elongation
Maximum 146.8 mm (5.780 inch)
No. 2 chain
Elongation
Maximum 146.8 mm (5.780 inch)
Chain vibration damper No. 1
Worn depth
Maximum 1.0 mm (0.039 inch)
Chain vibration damper No. 2
Worn depth
Maximum 1.0 mm (0.039 inch)
Chain tensioner No. 1 x Cylinder head sub-assy 9.0 Nm (92 kgf-cm, 80 inch lbs.)
Chain tensioner No. 2 x Cylinder head sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Chain tensioner No. 3 x Cylinder head sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Chain vibration damper No. 1 x Cylinder block sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Idle gear No. 1 x Cylinder block sub-assy 60 Nm (612 kgf-cm, 44 ft. lbs.)
Timing chain or belt cover sub-assy x Cylinder head and block 23 Nm (235 kgf-cm, 17 ft. lbs.)
Water pump assy x Timing chain or belt cover sub-assy
10 mm (0.39 inch) head 9.0 Nm (92 kgf-cm, 80 inch lbs.)
12 mm (0.47 inch) head 23 Nm (235 kgf-cm, 17 ft. lbs.)
VVT sensor x Timing chain or belt cover sub-assy 8.0 Nm (82 kgf-cm, 71 inch lbs.)
Idler pulley sub-assy No. 1 x Timing chain or belt cover sub-assy 54 Nm (551 kgf-cm, 40 ft. lbs.)
Idler pulley sub-assy No. 2 x Timing chain or belt cover sub-assy 39 Nm (398 kgf-cm, 29 ft. lbs.)
Elongation
Maximum 146.8 mm (5.780 inch)
No. 2 chain
Elongation
Maximum 146.8 mm (5.780 inch)
Chain vibration damper No. 1
Worn depth
Maximum 1.0 mm (0.039 inch)
Chain vibration damper No. 2
Worn depth
Maximum 1.0 mm (0.039 inch)
Chain tensioner No. 1 x Cylinder head sub-assy 9.0 Nm (92 kgf-cm, 80 inch lbs.)
Chain tensioner No. 2 x Cylinder head sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Chain tensioner No. 3 x Cylinder head sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Chain vibration damper No. 1 x Cylinder block sub-assy 19 Nm (194 kgf-cm, 14 ft. lbs.)
Idle gear No. 1 x Cylinder block sub-assy 60 Nm (612 kgf-cm, 44 ft. lbs.)
Timing chain or belt cover sub-assy x Cylinder head and block 23 Nm (235 kgf-cm, 17 ft. lbs.)
Water pump assy x Timing chain or belt cover sub-assy
10 mm (0.39 inch) head 9.0 Nm (92 kgf-cm, 80 inch lbs.)
12 mm (0.47 inch) head 23 Nm (235 kgf-cm, 17 ft. lbs.)
VVT sensor x Timing chain or belt cover sub-assy 8.0 Nm (82 kgf-cm, 71 inch lbs.)
Idler pulley sub-assy No. 1 x Timing chain or belt cover sub-assy 54 Nm (551 kgf-cm, 40 ft. lbs.)
Idler pulley sub-assy No. 2 x Timing chain or belt cover sub-assy 39 Nm (398 kgf-cm, 29 ft. lbs.)
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.