How to service and repair the timing chain on Toyota Tundra?

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The repair procedure for the timing chain starts with draining engine fluids followed by battery removal and subsequent steps including the V-bank cover then radiator until the fan with fluid coupling is loose enough to remove the drive belt and fan. Performance of the servicing process starts with the air cleaner separation followed by the removal of intake air surge tank and cylinder head cover. Then disconnect the VVT sensor and oil level gauge guide alongside the oil level gauge and O-ring. Start the vane pump disassembly by removing its P/S oil pressure switch connector while taking out the bolts but avoiding the pulley area. First reverse the order of operations by taking out the crankshaft pulley with Special Service Tool: 09213-54015 (91651-60855), 09330-00021 while holding the tool with Special Service Tool: 09950-50013 (09951-05010, 09952-05010, 09953-05020, 09954-05031) to complete removal. Then extract the idler pulleys No.1 and No.2 and the V-ribbed belt tensioner followed by the cooler compressor and generator. Begin the oil pan No.2 removal process by disconnecting bolts along with nuts followed by sealer cutting using Special Service Tool: 09032-00100 until the oil strainer and gasket can be detached. Remove the oil pan while also taking out the water inlet together with the timing chain cover but maintain intact contact surfaces during this process. The mechanic should handle the TDC/compression position of No.1 cylinder before removing the components in this sequence: chain tensioner No.1 followed by idle gear No.1 then chain vibration damper No.2 and finally the timing chain and crankshaft timing sprocket and No.2 timing chain. The mechanic must exercise caution to avoid harming the cylinder head and valve lifter. Check that the elongation of both No.1 and No.2 timing chains does not surpass 146.8 mm (5.780 inch). It is crucial to measure three assembly components in their minimum dimensions - 115.5 mm (4.547 inch) for the camshaft gear assembly and 73.1 mm (2.878 inch) for its sprockets and 61.0 mm (2.402 inch) for the crankshaft sprocket. The standard minimum diameter measurement for idle gear No.1 should be 61.0 mm (2.402 inch) and idle gear shaft oil clearance needs to be checked to ensure it stays within limits. A thorough test of chain tensioners should produce smooth results while chain tensioner slipper and vibration damper wear inspection must replace components when measuring depths reach 1.0 mm (0.039 inch).

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