Question 1

How to perform valve clearance service and repair related to the Exhaust Valve and Intake Valve on Toyota Sienna?

Accepted Answer

The process for valve clearance service requires draining coolant followed by removing the front wiper arm head cap along with right and left front wiper arms and cowl top ventilator louver sub-assembly and wiper link assembly. First remove the No. 1 cowl top to cowl brace inner and the outer front cowl top panel sub-assembly and the right front fender apron seal. Crank the V-bank cover sub-assembly away by using a socket hexagon wrench 5 to unscrew its 3 nuts and finish by removing the cover. Dismantle the emission control valve set by disconnecting two VSV connectors and removing the wire harness clamp while also detachment fuel vapor feed hoses and vacuum hoses prior to unfastening the two nuts securing the emission control valve set. The intake air surge tank requires separation through connector and hose disconnect methods followed by bolt and nut unfastening. Proceed by taking off the radiator hose inlet and ignition coil assembly with the cylinder head cover sub-assembly while detaching the engine wire harness then extracting the nine bolts. You must apply an E6 "Torx" socket wrench to remove the bolts and disconnect the engine wire harness protector from the left cylinder head cover sub-assembly. Use seal packing Part No. 08826-00080 or equivalent on the cylinder head before putting in the cylinder head covers while tightening their bolts according to specified torques. Secure all connections between the ignition coil assembly, intake air surge tank combined with new gasket, emission control valve set during the reinstallation process. Reinstallation occurs of engine components including V-bank cover, cowl top panel, wiper assemblies while you should add coolant and verify the coolant system for potential leaks.

Question 2

How to service and repair the Exhaust Valve and Intake Valve clearance on Toyota Solara?

Accepted Answer

The procedure to service and repair valve clearance begins with disconnection of the front wheel RH and front fender apron seal RH followed by engine No.1 cover sub-assembly extraction and subsequent removal of spark plug and ventilation hoses and engine wire and cylinder head cover sub-assembly. Perform this operation by disconnecting the engine wire harness clamp and taking out the 8 bolts and 2 nuts and removing cylinder head cover and gasket. Align the timing shaft marks on bearing caps No.1 and No.2 with the marks on the sprocket and camshaft while placing the No.1 cylinder at TDC compress by rotating the crankshaft pulley until it meets timing chain cover mark 0. Test the valve clearance under cold conditions by measuring each valve lifter to camshaft distance with a feeler gauge and note down any measurements beyond the approved range for adjustment shim selection. Continue the clockwise crankshaft rotation for 1 revolution of 360° to establish the No. 4 cylinder at TDC/compression and then measure the clearances once more. When installing the cylinder head cover you must first remove existing FIPG packing then apply the specified Toyota Genuine Adhesive 1344 or Three Bond 1344 or an equivalent product to designated areas of the seal while cleaning away the contact surface oil before installing within 5 minutes of application time and ignoring engine startup for two hours after installation. When installing the cylinder head cover use 8 bolts and 2 nuts which need a torque of 11 Nm (110 kgf-cm, 8 ft. lbs.) for A bolts while B bolts require 14 Nm (143 kgf-cm, 10 ft. lbs.) and applying 11 Nm (110 kgf-cm, 8 ft. lbs.) torque to the nut. Put the spark plug in position before tightening it to 19 Nm (194 kgf-cm, 14 ft. lbs.). Place the front wheel on the right side and check for any oil leaks.

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