CAMSHAFT

Disengage the clamps and disconnect the connectors to disconnect the wire harness from the cylinder head cover sub-assembly LH.
Remove the cylinder head cover sub-assembly LH.

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REMOVE CYLINDER HEAD COVER SUB-ASSEMBLY

Disengage the clamps and disconnect the connectors to disconnect the wire harness from the cylinder head cover sub-assembly.
Remove the cylinder head cover sub-assembly.

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REMOVE SPARK PLUG TUBE GASKET

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REMOVE TIMING CHAIN COVER PLATE

Remove the 4 bolts, timing chain cover plate and gasket.

SET NO. 1 CYLINDER TO TDC / COMPRESSION

*a Notch

Turn the crankshaft pulley clockwise to set the No. 1 cylinder to TDC/Compression by aligning the notch with the "0" timing mark of the timing chain or belt cover sub-assembly.

*a	for Bank 2
*b	for Bank 1
*c	Timing Mark
*d	Paint Mark

Check that the timing marks of the camshaft timing gears are aligned with the timing marks of the camshaft bearing caps as shown in the illustration.

Tech Tips

If the marks are not aligned, turn the crankshaft pulley clockwise to align the marks.

Place paint marks on the chain sub-assembly in alignment with the timing marks on each camshaft timing gear assembly and camshaft bearing cap.

Tech Tips

Be sure to place the paint marks on 2 links of the chain sub-assembly and on the sprockets of the camshaft timing gears at the locations of the timing marks of the camshaft timing gears.

REMOVE NO. 1 CHAIN TENSIONER ASSEMBLY

*a 0°

*b 30°

Turn the crankshaft approximately 30° counterclockwise so that there is some slack in the chain sub-assembly.

Tech Tips

This prevents the valves and pistons from interfering with each other.

*a	Hole in the Stopper Plate
*b	Hole in the No. 1 Chain Tensioner Assembly
*c	Pin

Align the hole in the stopper plate of the No. 1 chain tensioner assembly with the hole in the No. 1 chain tensioner body as shown in the illustration, and then insert a pin of 1.27 mm (0.0500 in.) diameter into the hole.

*a Notch

Turn the crankshaft clockwise until the timing notch is aligned with the "0" timing mark of the timing chain or belt cover sub-assembly.
Remove the 2 bolts and No. 1 chain tensioner assembly.

Note

Do not drop the No. 1 chain tensioner assembly or bolts into the timing chain or belt cover sub-assembly.

SEPARATE CHAIN SUB-ASSEMBLY (for Bank 1)

*a 30°

Turn the crankshaft clockwise until it is in the position shown in the illustration so that there is some slack in the chain sub-assembly between the banks.

CAUTION:

As the camshafts may turn suddenly, do not touch the camshafts or camshaft timing gears.

Note

When turning the crankshaft, engine oil may spray out of the oil holes.
*a 5 to 10°

Turn the crankshaft clockwise until it is in the position shown in the illustration so that the chain sub-assembly can be removed easily.

Note

When turning the crankshaft, engine oil may spray out of the oil holes.
Remove the chain sub-assembly from the sprocket of the camshaft timing gear assembly and set it on the camshaft timing gear assembly.

CAUTION:

As the camshafts may turn suddenly, do not touch the camshafts or camshaft timing gear assemblies. Hold the chain sub-assembly and lift it upward to remove it from the sprocket.

REMOVE CAMSHAFT BEARING CAP (for Bank 1)

*a	Service Bolt and Washers (Used to temporarily secure the camshaft housing sub-assembly RH)
*b	Part to be removed
*c	Install the service bolts and washers to temporarily secure the camshaft housing sub-assembly RH

Remove the bolts and camshaft bearing caps in the order shown in the illustration.

Immediately after removing the camshaft bearing caps, install service bolts and washers in the order shown in the illustration.

Torque:: 10 N*m { 102 kgf*cm, 7 ft.*lbf }

Note

Do not install the camshaft bearing caps when installing the service bolts and washers.
Be sure to follow the numerical order when performing this procedure.
Do not allow the service bolts or washers to contact the camshaft.
Do not drop the service bolts or washers into the cylinder head sub-assembly RH.

Tech Tips

Arrange the removed parts in such a way that they can be reinstalled to their original locations.
Part number for the service bolts used to temporarily secure the camshaft housing sub-assembly RH: 91551-F0850 (9 bolts)
Part number for the service washers used to temporarily secure the camshaft housing sub-assembly RH: 90201-12028 (18 washers)

REMOVE NO. 2 CAMSHAFT

Remove the bolt of the No. 2 chain tensioner assembly.
While lifting the No. 2 camshaft, remove the No. 2 chain tensioner assembly.
While lifting the No. 2 camshaft, pass it through the No. 2 chain sub-assembly and pull it out towards the front of the engine to remove it.

REMOVE CAMSHAFT

Lift the rear of the camshaft so that it is at an angle.
Remove the chain sub-assembly from the camshaft timing gear assembly and pull out the camshaft and No. 2 chain sub-assembly towards the rear of the engine to remove them.

Note

Do not drop the chain sub-assembly into the gap between the engine and timing chain or belt cover sub-assembly.
Suspend the chain sub-assembly with a string or equivalent.

SEPARATE CHAIN SUB-ASSEMBLY (for Bank 2)

*a Notch

Turn the crankshaft counterclockwise until the timing notch is aligned with the "0" timing mark of the timing chain or belt cover sub-assembly.
Remove the chain sub-assembly from the sprocket of the camshaft timing gear assembly and set it on the camshaft timing gear assembly.

CAUTION:

As the camshafts may turn suddenly, do not touch the camshafts or camshaft timing gear assemblies. Hold the chain sub-assembly and lift it upward to remove it from the sprocket.

REMOVE CAMSHAFT BEARING CAP (for Bank 2)

*a	Service Bolt and Washers (Used to temporarily secure the camshaft housing sub-assembly LH)
*b	Part to be removed
*c	Install the service bolts and washers to temporarily secure the camshaft housing sub-assembly LH

Remove the bolts and camshaft bearing caps in the order shown in the illustration.

Immediately after removing the camshaft bearing caps, install service bolts and washers in the order shown in the illustration.

Torque:: 10 N*m { 102 kgf*cm, 7 ft.*lbf }

Note

Do not install the camshaft bearing caps when installing the service bolts and washers.
Be sure to follow the numerical order when performing this procedure.
Do not allow the service bolts or washers to contact the camshaft.
Do not drop the service bolts or washers into the cylinder head sub-assembly LH.

Tech Tips

Arrange the removed parts in such a way that they can be reinstalled to their original locations.
Part number for the service bolts used to temporarily secure the camshaft housing sub-assembly LH: 91551-F0850 (8 bolts)
Part number for the service washers used to temporarily secure the camshaft housing sub-assembly LH: 90201-12028 (16 washers)

REMOVE NO. 4 CAMSHAFT SUB-ASSEMBLY

Remove the bolt of the No. 3 chain tensioner assembly.
While lifting the No. 4 camshaft sub-assembly, remove the No. 3 chain tensioner assembly.
While lifting the No. 4 camshaft sub-assembly, pass it through the No. 2 chain sub-assembly and pull it out towards the front of the engine to remove it.

REMOVE NO. 3 CAMSHAFT SUB-ASSEMBLY

Lift the rear of the No. 3 camshaft sub-assembly so that it is at an angle.
Remove the chain sub-assembly from the camshaft timing gear assembly and pull out the No. 3 camshaft sub-assembly and No. 2 chain sub-assembly towards the rear of the engine to remove them.

Note

Do not drop the chain sub-assembly into the gap between the engine and timing chain or belt cover sub-assembly.
Suspend the chain sub-assembly with a string or equivalent.

INSPECT CAMSHAFT TIMING GEAR ASSEMBLY

Check the lock of the camshaft timing gear assembly.
1. Secure the camshaft in a vise between aluminum plates, and confirm that the camshaft timing gear assembly is locked.
  
  Note
  
  Be careful not to damage the camshaft.

*a	Advanced Side Path
*b	Retard Side Path
*c	Open
*d	Close
	Rubber Piece
	Vinyl Tape

Release the lock pin.

Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.

Tech Tips

Plug 2 of the 4 paths with rubber pieces as shown in the illustration.
Break through the tape on the advance side path and the retard side path on opposite sides of the camshaft as shown in the illustration.
*a Advanced Side Path

*b Retard Side Path

Apply approximately 200 kPa (2.0 kgf/cm², 29 psi) of air pressure to the 2 open paths.

CAUTION:

Cover the paths with a piece of cloth when applying pressure to prevent oil from spraying.

*a	Advance Side Path
*b	Retard Side Path
*c	Hold pressure
*d	Decompress

Check that the camshaft timing gear assembly rotates in the advance direction when reducing the air pressure applied to the retard side path.

Tech Tips

The lock pin is released and the camshaft timing gear assembly turns in the advance direction.

When the camshaft timing gear assembly reaches the most advanced position, release the air pressure from the retard side path, and then release the air pressure from the advance side path.

Note

Be sure to release the air pressure from the retard side path first. If the air pressure of the advance side path is released first, the camshaft timing gear assembly may abruptly shift in the advance direction and break the lock pin.

Check for smooth rotation.
1. Turn the camshaft timing gear assembly within its movable range (21°) 2 or 3 times, but do not turn it to the most retarded position. Make sure that the camshaft timing gear assembly turns smoothly.
  
  Note
  
  Do not use air pressure to perform the smooth operation check.
Check the lock in the most retarded position.
1. Confirm that the camshaft timing gear assembly locks at the most retarded position.

REMOVE CAMSHAFT TIMING GEAR ASSEMBLY

*1	Flange Bolt
*2	Straight Pin
*a	Do not remove

Remove the flange bolt and camshaft timing gear assembly.

Note

Do not remove the other 3 bolts.
If planning to reuse the camshaft timing gear assembly, be sure to release the straight pin lock before installing the camshaft timing gear assembly.

INSPECT CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

Check the lock of the camshaft timing exhaust gear assembly.
1. Secure the camshaft in a vise, and confirm that the camshaft timing exhaust gear assembly is locked.

*a	Advanced Side Path
*b	Retard Side Path
*c	Open
*d	Close
	Rubber Piece
	Vinyl Tape

Release the lock pin.

Cover the 4 oil paths of the cam journal with vinyl tape as shown in the illustration.

Tech Tips

Plug 2 of the 4 paths with rubber pieces as shown in the illustration.
Break through the tape on the advance side path and the retard side path on opposite sides of the camshaft as shown in the illustration.
*1 Advanced Side Path

*2 Retard Side Path

Apply approximately 200 kPa (2.0 kgf/cm², 29 psi) of air pressure to the 2 open paths.

CAUTION:

Cover the paths with a piece of cloth when applying pressure to prevent oil from spraying.

*1	Advance Side Path
*2	Retard Side Path
*a	Hold pressure
*b	Decompress

Check that the camshaft timing exhaust gear assembly rotates in the retard direction when reducing the air pressure applied to the advance side path.

Tech Tips

The lock pin is released and the camshaft timing exhaust gear assembly turns in the retard direction.

When the camshaft timing exhaust gear assembly moves to the most retarded position, release the air pressure from the advance side path, and then release the air pressure from the retard side path.

Note

Be sure to release the air pressure from the advance side path first.

If the air pressure of the retard side path is released first, the camshaft timing exhaust gear assembly may abruptly shift in the advance direction and break the lock pin.

Check for smooth rotation.
1. Turn the camshaft timing exhaust gear assembly within its movable range (18.5°) 2 or 3 times, but do not turn it to the most advanced position.
  
  Make sure that the camshaft timing exhaust gear assembly turns smoothly.
  
  Note
  
  When the air pressure is released from the advance side path and then from the retard side path, the camshaft timing exhaust gear assembly automatically returns to the most advanced position due to the advance assist spring operation and locks. Gradually release the air pressure from the retard side path before performing the smooth rotation check.
Check the lock at the most advanced position.
1. Make sure that the camshaft timing exhaust gear assembly locks at the most advanced position.

REMOVE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY

*a	Flange Bolt
*b	Knock Pin
*c	Do not remove

Remove the flange bolt and camshaft timing exhaust gear assembly.

Note

Be sure not to remove the other 4 bolts.
If planning to reuse the camshaft timing exhaust gear assembly, be sure to release the straight pin lock before installing the camshaft timing exhaust gear assembly.

*a	0°
*b	30°

CAMSHAFT REMOVAL