Removal And Installation: Camshafts: Installation

WARNING: This page is about a different variant/trim than selected.

NOTE: If any new parts are being installed (cylinder head, valves, tappets, camshafts) it is necessary to check the valve clearance, follow the next 10 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 11.

Place a paint mark on the crankshaft at the 12 o'clock position.

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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.

NOTE: Lubricate the camshaft journals and camshaft bearing caps with clean engine oil.
- Lubricate the camshaft bearing caps with clean engine oil and install the camshaft bearing caps and bolts.
- Tighten the camshaft bearing cap bolts one turn at a time, until finger-tight.
- Tighten the camshaft bearing cap bolts in sequence shown in 2 stages.
  Torque:
  
  Stage 1: 62 lb.in (7 Nm) | Stage 2: 142 lb.in (16 Nm)
Fig 1: Camshaft Bearing Cap Bolts Tightening Sequence
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1. 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.
2. Use a feeler gauge to measure the clearance of each valve and record its location. Use the General Equipment: Feeler Gauge
3. Repeat to measure all of the lobe/tappet clearances.
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NOTE: The number on the valve tappet only reflects the digits that follow the decimal. For example, a tappet with the number 0.650 has the thickness of 3.650 mm.

NOTE: Select tappets using this formula: ideal tappet thickness = measured clearance + the existing tappet thickness - nominal clearance.

NOTE: The nominal clearance is:
- intake: 0.25 mm (0.01 in)
- exhaust: 0.30 mm (0.0115 in)
NOTE: The acceptable clearances after being fully installed are:
- intake: 0.23-0.28 mm (0.009-0.011 in)
- exhaust: 0.27-0.33 mm (0.010-0.013 in)
Select the closest tappet size to the ideal tappet thickness available and mark the installation location.
NOTE: Failure to follow the camshaft loosening procedure can result in damage to the camshafts.

NOTE: Mark the location and orientation of each camshaft bearing cap.

NOTE: Mark the location of the camshafts prior to removal.

Loosen the camshaft bearing cap bolts in sequence one turn at a time until all tension from the camshaft bearing caps. Remove the bolts, camshaft bearing caps and the camshafts.

Fig 2: Camshaft Bearing Cap Bolts Tightening Sequence
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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 TDC timing peg.

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If necessary, lubricate with clean engine oil and replace 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.

Lubricate the camshafts and camshaft journals with clean engine oil and install the camshafts.

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NOTE: Failure to follow the camshaft tightening procedure can result in damage to the camshafts.

NOTE: Lubricate the camshaft journals and camshaft bearing caps with clean engine oil.
- Lubricate the camshaft bearing caps with clean engine oil and install the camshaft bearing caps and the bolts.
- Tighten the camshaft bearing cap bolts one turn at a time, until finger-tight.
- Tighten the camshaft bearing cap bolts in sequence shown in 2 stages.
  Torque:
  
  Stage 1: 62 lb.in (7 Nm), Stage 2: 142 lb.in (16 Nm)
Fig 3: Camshaft Bearing Cap Bolts Tightening Sequence
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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 Special Service Tool: 303-465 Tool, Camshaft Align Timing.

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Install the VCT oil control solenoid and the bolt.
Torque:

97 lb.in (11 Nm)

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Install the variable valve timing unit. Refer to: Variable Valve Timing (VVT) Unit .