CAMSHAFT

Removal and Installation

1. Remove the timing chains. Refer to See: Timing Chain\Service and Repair\Removal and Replacement\Removal.
2. Remove the fuel rail and injectors. Refer to See: Powertrain Management\Fuel Delivery and Air Induction\Fuel Rail\Service and Repair.

3. Remove camshaft position brackets (RH shown LH similar).
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 numerical order as shown.

5. Remove valve lifters.

NOTE:
Identify installation positions to ensure proper installation.

6. Remove secondary timing chain tensioner from cylinder head

• Remove secondary tensioner with its stopper pin attached.

NOTE:
Stopper pin was attached when secondary timing chain was removed.

INSTALLATION

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

• Remove the old Silicone RTV Sealant from the bolt holes and threads.
• Do not scratch or damage the mating surfaces.

2. Before installing the front cam bracket, remove the old Silicone RTV Sealant from the mating surface using a scraper.

• 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 camshaft chain tensioners on both sides of cylinder head. Refer to See: Timing Cover\Service and Repair\Front Timing Chain Case.
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 made during removal, or follow the identification marks that are present on the new camshafts components for proper placement and direction of the components.

• 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 camshaft brackets, apply sealant to mating surface of No. 1 camshaft bracket.

• Use Genuine Silicone RTV Sealant, or equivalent. Refer to See: Specifications\Fluid Types.

• Before installation, wipe off any protruding sealant.
• Refer to See: Service Precautions\Precaution For Liquid Gasket.

• Install 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 .

• Tighten the camshaft brackets in the three steps, in numerical order as shown.

8. 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.

9. Install the IVT control solenoid valves with new gaskets. Refer to See: Timing Cover\Service and Repair\Front Timing Chain Case.

10. If necessary, install camshaft position sensor (PHASE) (RH and LH bank.)
11. Install the fuel rail and injectors. Refer to See: Powertrain Management\Fuel Delivery and Air Induction\Fuel Rail\Service and Repair.
12. Install the timing chains. Refer to See: Timing Chain\Service and Repair\Removal and Replacement\Installation.

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 See: Specifications.

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.

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

• 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.

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. Runout : Less than 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 See: Specifications.

  

• 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 See: Specifications.
• 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 See: Specifications.
• If out of specified range, replace either or both valve lifter and cylinder head assembly.