OEM 2003 Toyota 4Runner Timing Cover

2003 Toyota 4Runner Parts Questions & Experts Answers

• Q: How to replace the timing chain or Timing Cover sub-assembly on 2003 Toyota 4Runner?

  A: The first process to replace a timing chain or belt cover sub-assembly requires the power steering link assembly disassembly followed by removal of the differential carrier assembly front (4WD drive type) and engine drain of fluid coolant and oil. The replacement continues by removing the battery V-bank cover and radiator support seal upper following the removal of eleven clips. Users should first loosen the fan using fluid coupling then remove the fan with its generator V belt before removing the fan along with its fluid coupling. The technician should disconnect ventilation hose Number Two, remove the air cleaner assembly then dismantle the oil level gauge guide by unthreading the oil level gauge together with its bolt and O-ring. The water inlet removal procedure must precede vane pump assembly separation and the removal of generator assembly, cooler compressor assembly, V-ribbed belt tensioner assembly and idler pulley sub-assemblies No.1 and No.2. The technicians should utilize Special Service Tool: 09032-0100 09213-54015 (91651-60855), 09330-0021, 09950-50013 (09951-05010, 09952-5010, 09953-05020, 09954-05030) to detach the crankshaft pulley before moving on to remove the oil pan sub-assembly No.2, oil strainer sub-assembly, and oil pan sub-assembly. Detach the ignition coil assembly while removing the 2 oil control valve connectors along with the intake air surge tank and camshaft timing oil control valve assembly and cylinder head cover sub-assemblies by removing their 2 bolts and valves. The VVT sensor along with the oil filter bracket subassembly can be removed after unfastening all 3 bolts and two nuts. Take out each of the 24 bolts along with two nuts before prying the timing chain or belt cover sub-assembly from its position with caution toward keeping contact surfaces intact and extract the O-ring present on the LH cylinder head. A screwdriver can be used to pry out the timing gear case or timing chain case oil seal but it should be done carefully to prevent damaging the oil pump assembly. The installation of a new oil seal requires Special Service Tool: 09226-10010 along with a hammer to tap it until it reaches the timing chain cover edge while applying MP grease to the oil seal lip. Installation of the timing chain or belt cover sub-assembly requires removing old packing material while avoiding contact surface contaminations along with new O-ring installation on the LH cylinder head followed by application of a continuous seal packing bead (Part No. 08826-00080 or equivalent) to specified areas. The installation of the timing chain cover needs to occur within three minutes of seal packing application before securing all bolts and nuts to a torque of 23 Nm (235 kgf-cm, 17 ft. lbs.) while avoiding chain or slipper overlap of the timing chain cover seal line. The oil filter bracket sub-assembly requires installation with a new gasket while the technician tightens the components to 19 Nm (194 kgf-cm, 14 ft. lbs.). The next sequence of installation includes the VVT sensor followed by the camshaft timing oil control valve assembly (tightening to 9.0 Nm (92kgf-cm, 80 inch lbs.)), then cylinder head cover sub-assemblies, ignition coil assembly (toughened to 9.0 Nm (92kgf-cm, 80 inch lbs.)), intake air surge tank, oil pan sub-assemblies, The last step includes installing the V-ribbed belt tensioner assembly, cooler compressor assembly, generator assembly, vane pump assembly, water inlet, oil level gauge guide, air cleaner assembly followed by ventilation hose No.2 connection until installation of the fan with fluid coupling and fan and generator V belt to finalize the fan tightening with fluid coupling. The installation of engine oil and coolant requires a leak-free check before the V-bank cover receives two nuts tightened to 7.5 Nm (76 kgf-cm, 66 inch lbs.).