Removal And Installation

CAMSHAFT


Removal and Installation







CAUTION:
Apply new engine oil to parts marked in illustration before installation.

REMOVAL
1. Remove the timing chains. Refer to Service and Repair.





2. If necessary, remove camshaft position sensor (PHASE) (right and left bank) from cylinder head back side.

CAUTION:
- Handle carefully to avoid dropping and shocks.
- Do not disassemble.
- Do not allow any metal particles to adhere to magnetic part at sensor tip.
- Do not place sensors in a location where they are exposed to magnetism.





3. Remove the IVT control solenoid valves.
- Discard the IVT control solenoid valve gaskets and use new gaskets for installation.





4. Remove the intake and exhaust camshaft brackets and the camshafts.
- Mark the camshafts, camshaft brackets, and bolts so they are placed in the same position and direction for installation.
- Equally loosen the camshaft bracket bolts in several steps in the order as shown.





5. Remove valve lifters.

NOTE:
Identify installation positions to ensure proper installation.





6. Remove camshaft RH (1) and LH (2) secondary timing chain tensioner (3) from cylinder head with the stopper pin (5) inserted.

NOTE:
Stopper pin (5) was installed when secondary timing chain was removed.
- O-rings (4)

INSPECTION AFTER REMOVAL

Camshaft Visual Check
Check camshaft for scratches, seizure and wear. Replace if necessary.

Camshaft Runout
1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown.





2. Set dial gauges vertically to No. 3 journal as shown.
3. Turn camshaft in one direction slowly by hand, measure the camshaft runout on the dial gauges.
- Runout is the largest indicator reading after one full revolution.






4. If actual runout exceeds the limit, replace the camshaft.

Camshaft Cam Lobe Height






1. Measure camshaft cam lobe height as shown. Refer to Maintenance.
2. If wear has reduced the lobe height below specifications, replace the camshaft.

Camshaft Journal Clearance






Outer Diameter of Camshaft Journal
- Measure outer diameter of camshaft journal as shown.






Inner Diameter of Camshaft Bracket






1. Tighten camshaft bracket bolts to specified torque.
2. Using inside micrometer, measure inner diameter (A) of camshaft bearing.






Calculation of Camshaft Journal to Bracket Clearance
(Journal clearance) = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal)






- When out of the specified range, replace either or both camshaft and cylinder head.
NOTICE:
Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylinder head assembly.

Camshaft End Play
1. Install the camshaft in the cylinder head. Refer to "Removal and Installation".





2. Install dial gauge in thrust direction on front end of camshaft.
Measure end play when camshaft is moved forward/backward (in direction to axis) as shown.






- If out of the specified range, replace with new camshaft and measure again.
- If out of the specified range again, replace with new cylinder head.

Camshaft Sprocket Runout






1. Put V-block on precise flat bed and support No. 2 and No. 4 journal of camshaft as shown.
2. Install camshaft sprocket on camshaft.
3. Measure camshaft sprocket runout.

Limit : 0.15 mm (0.0059 in)

4. If sprocket runout exceeds the limit, replace camshaft sprocket.

Valve Lifter






- Check if the surface of the valve lifter has any excessive wear or cracks, replace as necessary.

Valve Lifter Clearance
Outer Diameter of Valve Lifter






- Measure the outer diameter of the valve lifter. Refer to Maintenance.
- If out of the specified range, replace the valve lifter.

Valve Lifter Bore Diameter





- Using inside micrometer, measure diameter of valve lifter bore of cylinder head. Refer to Maintenance.
- If out of the specified range, replace the cylinder head assembly.
Calculation of Valve Lifter Clearance
- (Valve lifter clearance) = (hole diameter for valve lifter) - (outer diameter of valve lifter). Refer to Maintenance.
- If out of specified range, replace either or both valve lifter and cylinder head assembly.

INSTALLATION






1. Before installation, remove any old Silicone RTV Sealant from component mating surfaces using suitable tool.

CAUTION:
Do not scratch or damage the mating surfaces.

NOTE:
Remove the old Silicone RTV Sealant from the bolt holes and threads.





2. Before installing the No. 1 camshaft bracket, remove the old Silicone RTV Sealant from the mating surface using suitable scraper.

CAUTION:
Do not scratch or damage the mating surface.





3. Turn the crankshaft until No. 1 piston is set at TDC on the compression stroke.
- The crankshaft key should line up with the right bank cylinder center line as shown.





4. Install the RH (1) and LH (2) secondary timing chain tensioners (3) on the cylinder heads.
- O-rings (4)
- Stopper pins (5)
5. Install valve lifters.

NOTE:
Install them in original positions.





6. Install exhaust and intake camshafts and camshaft brackets.
- Intake camshaft has a drill mark on camshaft sprocket mounting flange.
- Follow your identification marks (2) and (3) made during removal, or follow the identification marks (1) that are present on the new camshafts components for proper placement and direction of the components.





Arrow: Indicates engine front










- Position the camshafts:
RH exhaust camshaft dowel pin at about 10 o'clock.
LH exhaust camshaft dowel pin at about 2 o'clock.






7. Before installing No. 1 camshaft brackets, apply sealant to mating surface of No. 1 camshaft bracket.
- Use Genuine Silicone RTV Sealant, or equivalent. Refer to Recommended Chemical Products and Sealants.






- Before installation, wipe off any protruding sealant.
- Refer to Precaution For Liquid Gasket.






- Install remaining camshaft brackets in their original positions and direction. Align the stamp marks as shown.
- If checking and adjusting any part of valve assembly or camshaft, check valve clearance according to the reference data. Refer to .






8. Tighten the camshaft brackets in the four steps, as shown.
















9. Measure difference in levels between front end faces of No.1 camshaft bracket and cylinder head.

Standard : - 0.14 ( - 0.0055 in)

- If measurement is outside the specified range, re-install camshaft and camshaft bracket.






10. Install the IVT control solenoid valves with new gaskets.
11. If necessary, install camshaft position sensor (PHASE) (RH and LH bank.)
12. Install the timing chains. Refer to Service and Repair.