Toyota 13502-74030 CAMSHAFT

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To remove the camshaft, first disconnect the negative cable from the battery and detach the air cleaner inlet duct. Drain the cooling system and label and disconnect all hoses, wires, linkages, tubes, and brackets attached to the camshaft housing, including the heater tube at the rear end housing. Unbolt and remove the rear housing, then take off the timing belt and camshaft pulley. Remove the valve cover and loosen each bolt of the camshaft housing a little at a time. With the camshaft still in the housing, check the endplay using a dial indicator; if it exceeds the limit, replace the camshaft or housing. Detach the camshaft oil seal retainer and remove the camshaft, being careful not to damage the bearings. Pry the O-ring out of the retainer and slowly pull the camshaft out while turning it. Remove the rocker arms and withdraw the lash adjusters, keeping them in order for reinstallation. Visually inspect the camshaft journals and rocker arms for damage and measure the cam lobe height and journal diameter with a micrometer, replacing any worn components. Measure the housing bore and determine the bearing oil clearance, replacing the camshaft and housing if necessary. Before reinstalling, bleed the lash adjusters by immersing them in light oil and using a tool to slide the plunger. Replace any lash adjuster with a new one if the plunger stroke exceeds 0.020-inch after bleeding. Check the camshaft housing for warpage using a straightedge and feeler gauge, replacing it if the warpage exceeds the maximum specified. For installation, apply engine assembly lube or moly-base grease to the camshaft lobes, journals, rocker arms, and lash adjusters. Insert the camshaft into the housing, install a new O-ring and oil seal retainer with anaerobic sealant on the first few threads of the retainer bolts. Clean the mating surfaces of the camshaft housing and cylinder head, apply a bead of sealant, and then install and tighten the housing bolts in sequence to the specified torque.

Lift the camshaft out of the head.

First, verify the markings on the camshaft bearing caps. Then, loosen the caps in the reverse order of the tightening sequence, detach them, and remove the camshaft(s) from the cylinder head.

Before starting the camshaft removal process, you should have two 6 x 1.0 mm bolts measuring 16 to 20 mm in length, referred to as service bolts.

Final steps include reassembling the exhaust camshaft gear, aligning timing marks, securing bearing caps, and installing the timing belt and remaining components. Proper alignment of timing marks is crucial to maintain engine timing and performance.

The key steps involve removing each of the four camshafts. First, secure the exhaust camshaft sub-gear. Then, disassemble the intake and exhaust camshafts by loosening and removing the bearing caps in a specific sequence.