- Before servicing the vehicle, refer to the precautions section.
Remove or disconnect the following:
Negative battery cable. If equipped with an air bag, wait at least 90 seconds before proceeding.
Place the No.1 piston at TDC compression. Check only those valves shown. Record the clearance. If out of clearance, the measurement will be used to calculate the adjusting shims.
Place the No.4 piston at TDC compression. Check only those valves shown. Record the clearance. If out of clearance, the measurement will be used to calculate the adjusting shims.
Clearance range is:
To adjust the valves:
- Turn the crankshaft 1 complete revolution (360 degrees) clockwise and set the No.1 piston at TDC compression. Place matchmarks on the chain and camshaft sprocket.
- Remove the tensioner.
- Loosen the camshaft sprocket bolt.
- Remove the exhaust camshaft bearing caps, raise the camshaft and remove the sprocket. Tie the chain out of the way.
- Remove the camshaft.
Remove the lifters and keep them in order.
- Measure the thickness of any lifter on which the clearance was out of range. Calculate the thickness of the necessary replacement lifter. Lifters are available in 0.020mm increments from 5.060mm to 5.740mm.
- For Camshaft and Timing Chain installation, see the respective procedures in this section.
- Before servicing the vehicle, refer to the Precautions Section.
- Relieve the fuel system pressure.
- Drain the engine oil.
- Drain the coolant from the engine radiator and hybrid transaxle.
Remove or disconnect the following:
Negative battery cable
- Turn the crankshaft pulley and align its groove with the timing mark 0 of the No. 1 timing cover.
Check that the valve lifters on the No. 1 cylinder (intake and exhaust) are loose. If not, turn the crankshaft 1 complete revolution (360 degrees).
NOTEAll measurements should be written down. These recorded measurements will need to be used in conjunction with a mathematical formula to determine the thickness of the replacement shims.
Measure the clearance between the valve lifters and the camshaft. Record the measurements on valves No. 1 and 6 intake; No. 2 and 3 exhaust.
- The intake valve clearance cold is 0.006-0.010 in. (0.15-0.25mm).
- The exhaust valve clearance cold is 0.010-0.014 in. (0.25-0.35mm).
Turn the crankshaft
of a revolution (240 degrees). Record the measurements on valves No. 2 and 3 intake; No. 4 and 5 exhaust.
Turn the crankshaft another
of a revolution (240 degrees). Record the measurements on valves No. 4 and 5 intake; No. 1 and 6 exhaust.
- Remove the adjusting shim by turning the crankshaft to position the cam lobe of the camshaft in the up position on the valve to be adjusted. Using a small thin flat bladed tool, turn the valve lifter so that the notches are perpendicular to the camshaft. Press down the valve lifter with tool 09248-55010 part A. Place too 09248-55010 part B between the camshaft and the valve lifter; remove part A.
- Remove the adjusting shim with a magnet and a small screwdriver.
Determine the replacement adjusting shim size by either using the charts or the following formulas:
Intake: N = T + (A - 0.008 in./0.020mm)
Select a new shim with a thickness as close as possible to the calculated value. Install the new replacement shim.
NOTEShims are available in 17 sizes in increments of 0.0020 in. (0.050mm), from 0.0984 in. (2.500mm) to 0.1299 in. (3.300mm).
- Recheck the valve clearance.
Install or connect the following:
- Refill the cooling system to the correct level.
- Refill the engine oil to the correct level.
- Start the engine and check for leaks.
- If necessary, perform the initialization procedure, as outlined in the Chassis Electrical System.