Removal And Installation: Camshafts: Installation
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NOTE: If any new parts are being installed (cylinder head, valves, tappets, camshafts) it is necessary to check the valve clearance, follow the next 17 steps exactly or serious damage to the engine may occur. If the original parts are being installed it is not necessary to check the valve clearance so proceed to step 18.
Install the crankshaft bolt, washer and place a paint mark on the crankshaft bolt at the 12 o'clock position.
- Remove Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
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NOTE: Rotating the crankshaft will position all of the pistons below the deck of the cylinder block and allow the camshafts to be installed and the valve clearance checked without the possibility of damage to the valves or pistons.
Using the crankshaft bolt and washer, rotate the crankshaft clockwise 270 degrees until the paint mark is at the 9 o'clock position.
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NOTE: Failure to follow the camshaft tightening procedure can result in damage to the camshafts.
- Lubricate the camshafts, camshaft journals and camshaft bearing caps with clean engine oil and install.
- Install the camshaft caps and the bolts.
- Tighten 2 turns at a time in the sequence shown in 2 stages.
Torque: Stage 1: 62 lb.in (7 Nm) - - Stage 2: 142 lb.in (16 Nm)
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NOTE: The camshaft seal gaps must be at the 12 o'clock position or damage to the engine may occur.
Inspect and position the camshaft seals gaps at the 12 o'clock position as shown.
- Lubricate the camshafts journals with clean engine oil.
- Install the camshaft cap and the bolts.
Torque: Stage 1: 62 lb.in (7 Nm) - - Stage 2: 142 lb.in (16 Nm)
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NOTE: Do not remove the spark plugs when the engine is hot or cold soaked. Spark plug thread or cylinder head damage can occur. Make sure the engine is warm (hand touch after cooling down) prior to spark plug removal.NOTE: If a spark plug is dropped, internal damage may result and the spark plug must be discarded. The use of a damaged spark plug may cause cylinder misfire resulting in engine damage.NOTE: Only use hand tool to remove the spark plugs.
Remove the spark plugs.
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- Using the flats of the camshaft, rotate the camshaft to place the cam lobe at base circle, with the lobe pointed away from the tappet.
- Use a feeler gauge to measure the clearance of each valve and record its location. Use the General Equipment: Feeler Gauge
- Repeat to measure all of the lobe/tappet clearances.
- Valve tappet assembly grade chart
- Grade
- Id Mark
- Thickness (mm)
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NOTE: There are two numbers on the valve tappet, one is date code and the other is valve tappet thickness.NOTE: The date code "R0605" represents the year made (R), the month (06) and the day (05).NOTE: A tappet with the number N650 has the thickness of 3.650 mm.NOTE: Select tappets using this formula: tappet thickness = measured clearance + the existing tappet thickness - nominal clearance.NOTE: The nominal clearance is:
- Intake : 0.25 mm (0.0095 in).
- Exhaust : 0.36 mm (0.0142 in).
NOTE: The acceptable clearances after being fully installed are:- Intake : 0.19-0.31 mm (0.0075-0.0122 in).
- Exhaust : 0.3-0.42 mm (0.0118-0.0165 in).
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NOTE: Only use hand tool to install the spark plugs.
Install the spark plugs.
Torque: 106 lb.in (12 Nm)
- Remove the bolts and the front camshaft cap.
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NOTE: Failure to follow the camshaft loosening procedure can result in damage to the camshafts.
Loosen the camshaft bearing caps in sequence 2 turns at a time until all tension is released from the camshaft bearing caps and remove the bolts, caps and camshafts.
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- Install Special Service Tool: 303-507 Timing Peg, Crankshaft TDC.
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NOTE: Rotating the crankshaft will position the engine at TDC and allow you to install the camshafts in the same position as noted during the disassembly.
Rotate the crankshaft clockwise 90 degrees so the crankshaft contacts the crankshaft timing peg.
- If necessary, replace and lubricate any tappets with the correct tappets selected during the valve clearance check.
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NOTE: Install the camshafts with the Alignment slots in the camshafts lined up so the Camshaft Alignment Plate can be installed without rotating the camshafts. Make sure the lobes on the No. 1 cylinder are in the same position as noted in the removal procedure. Rotating the camshafts when the timing chain is removed, or installing the camshafts 180 degrees out of position can cause severe damage to the valves and pistons.NOTE: Failure to follow the camshaft tightening procedure can result in damage to the camshafts.
- Lubricate the camshaft, camshaft journals and camshaft bearing caps with clean engine oil.
- Install the camshafts, caps, bolts and tighten the camshaft bearing cap bolts one turn at a time, until finger-tight.
Torque: Stage 1: 62 lb.in (7 Nm) - - Stage 2: 142 lb.in (16 Nm)
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NOTE: The camshaft seal gaps must be at the 12 o'clock position or damage to the engine may occur.
Inspect and position the camshaft seals gaps at the 12 o'clock position as shown.
- Lubricate the camshafts journals with clean engine oil.
- Install the camshaft cap and the bolts.
Torque: Stage 1: 62 lb.in (7 Nm) - - Stage 2: 142 lb.in (16 Nm)
- Install the VCT oil control solenoids and the bolts.
Torque: 97 lb.in (11 Nm)
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NOTE: The Camshaft Alignment Tool is for camshaft Alignment only. Using this tool to prevent engine rotation can result in engine damage.
Install the special tool into the slots on the back of the camshafts. Install Special Service Tool: 303-1685 Alignment Tool, Camshaft.
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- If the camshafts were removed for servicing other components, install the timing chain. Refer to: Timing Chain .
- If the camshafts were replaced, install the VCT units. Refer to: Variable Camshaft Timing (VCT) Unit .
- Pressurize the fuel system. Refer to: Fuel System Pressure Release .