Toyota Land Cruiser 100 Series Timing Belt Replacement Guide
Essential Torque Specs
Component | Torque Spec |
Crankshaft Pulley Bolt | 180 ft-lbs (245 Nm) |
Camshaft Pulley Bolts | 80 ft-lbs (108 Nm) |
Timing Belt Idler Pulleys | 25 ft-lbs (35 Nm) |
Drive Belt Tensioner To Block | 12 ft-lbs (16 Nm) |
Teardown & Access:
Drain the coolant, remove the radiator hoses, intake tube, and cooling fan. Remove the serpentine belt. Unbolt the AC compressor, power steering pump, and alternator to move them aside (do not disconnect the AC or power steering fluid lines). Remove the upper and lower plastic timing belt covers.
Set Engine Timing: Critical step for valve safety.
Reinstall the crankshaft bolt temporarily. Rotate the engine clockwise until the notch on the crankshaft pulley aligns with the "0" mark (Top Dead Center) on the lower cover. Verify that the timing marks on both camshaft sprockets align with the notches on the rear backing plates.
Safety tip: Toyota recommends turning the crank an additional 50 degrees past TDC before removing the belt so that no valves can hit the pistons if a camshaft springs backward.
Remove Balancer and Belt:
Remove the crankshaft bolt using a harmonic balancer holding tool. Pull off the harmonic balancer. Unbolt the hydraulic timing belt tensioner (two bolts) and remove the old timing belt.
Install New Belt and Pulleys:
If replacing them, install the new idler pulleys and torque to 25 ft-lbs. Route the new timing belt. If using an OEM Toyota/Aisin belt, align the solid line with the crank dimple, the "L CAM" dashed line with the driver's side (left) cam mark, and the "R CAM" dashed line with the passenger's side (right) cam mark. Tip: Rotate the driver's side cam backward slightly with a wrench to take tension off while slipping the belt on.
Tension the Belt:
Install the new hydraulic tensioner. Once securely bolted, pull the retaining pin to apply tension to the belt.
Verify Timing (The 720 Rule):
Rotate the crankshaft clockwise exactly two full revolutions (720 degrees). Verify that the camshaft and crankshaft timing marks on the gears still perfectly align with the marks on the engine block. Note: The printed lines on the belt itself will no longer align, which is completely normal.
Final Reassembly:
Reinstall the harmonic balancer and torque the crank bolt to 180 ft-lbs. Reinstall all covers, accessories, the cooling fan, and the radiator. Refill and bleed the coolant.
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