OEM Toyota Tundra Timing Chain

Toyota Tundra Timing Chain Parts and Q&A

• Secondary Chain
  13507-AD010
  Q: What are the methods to replace the oil seal and install the timing chain on Toyota Tundra?

  A:

  There are two ways to replace the oil seal: first method involves removing the rear timing chain cover where you can use a screwdriver while taped to protect the oil pump but applying SST 09226-10010 with a hammer to install a new oil seal until it reaches the timing chain cover edge and applying MP grease to the lip; second method requires following the same steps but avoiding the crankshaft area. Use the crankshaft pulley set bolt to maneuver the set key into horizontal position to the left side while positioning the crankshaft properly to prevent piston and valve contact while installing Camshafts. Secure Chain Tensioner No.2 by pinning it with a 1.0 mm diameter rod then tightening the bolt to 19 Nm (194 kgf-cm, 14 ft. lbs.). The final operation involves aligning the yellow mark links of the camshaft timing gear assembly and sprocket timing marks before installing temporary camshaft timing gear bolts without undue force on the assembly. After securing the camshaft hexagonal portion with a wrench you should tighten the bolts to 100 Nm (1,020 kgf-cm, 74 ft. lbs.) after removing the chain tensioner No.2 pin. Start by installing chain vibration damper No.1 while torquing its two bolts to 19 Nm (194 kgf-cm, 14 ft. lbs.) then position the timing gear set key into the timing sprocket key groove before attaching the timing gear to the crankshaft. Finish the installation of the chain tensioner slipper and chain tensioner No.1 by pushing in the plunger during a clockwise stopper plate turn followed by securing the tensioner with two bolts torqued to 10 Nm (102 kgf-cm, 7 ft. lbs.), keeping in place a 3.5 mm bar to fix the stopper plate. Use the timing marks to orient No.1 cylinder at TDC/compression position by rotating the crankshaft to match the cylinder block timing line with the crankshaft set key. Fitting timing chain No.1 requires proper positioning where the crankshaft timing sprocket connects with the yellow mark while the orange mark links must match up with the camshaft timing gear assembly and sprocket timing marks. The repair sequence begins with changing the chain tensioner damper to No.2 before adding idle gear No.1 which requires engine oil treatment to rotating surfaces followed by a temporary placement step while aligning the knock pin before tightening idle gear shaft No.2 using a 10 mm hexagon wrench up to 60 Nm (612 kgf-cm, 44 ft. lbs.), then removing the bar from the chain tensioner. Each step of installing the timing chain cover needs precise timing: begin by replacing the old packing material with new O-ring installation on the LH cylinder head then apply seal packing (Part No.08826-00080 or equivalent) to specified locations and complete the assembly within three minutes and all bolts and nuts need tightening to 23 Nm (235 kgf-cm, 17 ft. lbs.) within fifteen minutes. Begin the process by attaching the water inlet system using a fresh O-ring and gasket while applying soapy water on the O-ring and tightening five bolts to 9.0 Nm (92 kgf-cm, 80 inch lbs.) and proceed to connect the water by-pass hoses and Radiator hoses and oil-cooler hoses. Install the oil pan through 4 stud bolts with 4.0 Nm (41 kgf-cm, 35 inch lbs.) torque while emptying old packing materials and using seal packing (Part No.08826-00080 or equivalent) before keeping the oil pan secure with 17 bolts and 2 nuts torqued evenly to specific torque values. The oil strainer requires new gasket installation before using two nuts which must be torqued to 9.0 Nm (92 kgf-cm, 80 inch lbs.) for attachment. After seal packing application install oil pan No.2 using 15 bolts and 2 nuts that must be torqued per specified values. The installation requires the crankshaft pulley to be connected using SST 09213-54015 (91651-60855), 09330-00021 with a torquing requirement of 250 Nm (2,549 kgf-cm, 184 ft. lbs.). Once the crankshaft pulley is in place the idler pulleys No.1 and No.2 need their specified torque value achieved during installation. The V-ribbed belt tensioner assembly needs bolt integration at 36 Nm (367 kgf-cm, 27 ft. lbs.) following installation of specified torque values on the cooler compressor and generator and vane pump. The oil level gauge guide requires a new O-ring before installation. Use a bolt to fasten it with 9.0 Nm (92 kgf-cm, 80 inch lbs.) torques before putting on the oil level gauge and successive components including cylinder head cover, intake air surge tank, air cleaner, fan with fluid coupling, Drive Belt, radiator, V-bank cover, and battery. The last task includes adding engine oil and coolant then checking for leaks while also inspecting ignition timing and idle speed control.
• Timing Chain
  13506-AD010
  Q: How to service and repair the timing chain on Toyota Tundra?

  A:

  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).