Toyota 13506-75020
Timing Chain

Service and repair of the timing chain starts with complete engine under cover removal and engine oil drain. The front drive shafts together with front differential must be removed on 4WD versions. The service requires starting with generator drive belt removal followed by fluid coupling fan and water pump pulley. Last, remove the cylinder head assembly. The timing chain service requires users to first disconnect A/C compressor equipment using four removeable bolts to save the compressor unit. The generator requires disconnecting and nut removal with wire clip before unfastening pivot bolts and lock bolts. The repair process begins with sensor removal from the crankshaft position together with its O-ring and follows with the flywheel housing under cover, dust seal, and finally the oil pan extraction using 16 bolts and two nuts while cutting off the applied sealer with Special Service Tool: 09032-00100. Remove the oil strainer, crankshaft pulley (using Special Service Tools 09213-54015 and 09330-00021 if required) together with the timing chain cover through a combination of loosening water bypass pipe nuts and timing chain cover bolts. Follow the order to remove the No.1 timing chain and camshaft timing gear and then proceed to detach the crankshaft timing gear using Special Service Tool: 09950-40011. Proceed to remove the No.1 vibration damper then remove the No.2 and No.3 vibration dampers together with the No.2 chain tensioner and ensure to lock the plunger with a pin. Proceed by first removing the balance shaft drive gear and shaft and following it with removal of No.2 timing chain and No.2 crankshaft timing sprocket. The sequence continues with the removal of the No.1 vibration damper. Examine the timing chains along with gears and sprockets for component elongation together with wear patterns because any components with excessive limits need replacement. Proceed with the installation of the No.1 cylinder at TDC, followed by the sequence of No.4 vibration damper then No.2 timing chain and No.2 crankshaft timing sprocket and balance shaft drive gear and shaft where all timing marks should be perfectly aligned. The installation process requires the placement of the No.2, No.3 vibration dampers along with the No.2 chain tensioner before moving to the No.1 timing chain tensioner slipper and No.1 vibration damper. Mount the crankshaft timing gear while installing the No.1 timing chain along with accurate alignment. The procedure requires installation of the timing chain cover using new gaskets while placing the crankshaft pulley then the oil strainer and the oil pan by using seal packing (Part No. 08826-00080 or equivalent) according to specifications. The service requires you to reinstall the flywheel housing under cover and crankshaft position sensor together with a fresh O-ring while adding the generator and adjusting bar and bracket followed by A/C compressor and bracket installation if A/C is present on the vehicle. The last steps include installing the cylinder head assembly while also adding the water pump pulley, fan with fluid coupling along with the generator drive belt then completing with installation of front differential and front drive shafts when the vehicle has a 4WD system. After filling with engine oil start the engine to verify any fluid leakages before reinstalling the engine under cover then perform a vehicle road test and check engine coolant and oil levels.

Inspect the timing chains and sprockets by measuring the length of 16 links fully stretched and measuring sprocket diameter with vernier calipers.

For 2WD models, remove the stiffener plates by taking out 8 bolts, then remove the flywheel housing under cover and dust seal, followed by the oil pan by taking out 16 bolts and 2 nuts, using SST 09032-00100 to cut off the applied sealer.

Disconnect the generator connector, remove the nut and wire clip, and take out the lock bolt, pivot bolt, and generator.

Fill with engine oil, start the engine to check for leaks, install the engine under cover, and conduct a vehicle road test to check for abnormal noise, shock slippage, correct shift points, and smooth operation, finally rechecking engine coolant and oil levels.

Begin by removing the engine under cover and draining the engine oil.