Removal And Installation

CAMSHAFT

Removal and Installation












REMOVAL

1.Disconnect battery negative terminal. Removal and Replacement.
2.Remove the rocker cover. Service and Repair.
3.Remove the splash shield (RH). Component.
4.Support the front of the engine using a suitable jack.
5.Remove the torque rod and the engine mounting insulator and bracket (RH). Removal and Replacement.
6.Remove the coolant overflow reservoir tank.
7.Disconnect variable timing control solenoid harness connector.





8.Loosen the IVT control cover bolts in the order as shown.





- Remove the IVT control cover by cutting the sealant using
Tool.










9.Set the No.1 cylinder at TDC on its compression stroke with the following procedure:
a.Rotate crankshaft pulley clockwise, and align mating marks for
TDC with timing indicator on front cover, as shown.





b.At the same time, make sure that the mating marks on camshaft sprockets are lined up with the yellow links in the timing chain, as shown.
- If not, rotate crankshaft pulley one more turn to line up the mating marks to the yellow links, as shown.
10.Disconnect and remove the camshaft position sensor.
11.Pull the timing chain guide out between the camshaft sprockets through front cover.





12.Remove camshaft sprockets with the following procedure.

CAUTION:
- Do not rotate the crankshaft or camshaft while the timing chain is removed.
- Rotating the crankshaft or the camshaft after the timing chain has been removed causes interference between the valves and pistons.
NOTE:
- It is not necessary to hold tension on the timing chain and crankshaft sprocket during this procedure.
- The crankshaft and timing chain cannot become disconnected while the front cover is attached.
a.Line up the mating marks on camshaft sprockets with the yellow links in the timing chain, and paint an indelible mating mark on the sprocket and timing chain link plate.





b.Push in the tensioner plunger and hold. Insert a stopper pin into the hole on tensioner body to hold the chain tensioner. Remove the timing chain tensioner.
- Use a wire with 0.5 mm (0.02 in) diameter for a stopper pin.
c.Secure the hexagonal part of camshaft with a suitable tool.
Loosen the camshaft sprocket mounting bolts and remove the camshaft sprockets.





13.Loosen the camshaft bracket bolts in the order as shown, and remove the camshaft brackets and camshafts.
- Remove No.1 camshaft bracket by slightly tapping it with a rubber mallet.
14.Remove the valve lifters, if necessary.
- Check mounting positions, and set them aside in the order removed.

INSPECTION AFTER REMOVAL

Camshaft Runout





1.Put the camshaft on a V-block supporting the No.2 and No.5
journals.
2.Set the dial gauge vertically on the No.3 journal.
3.Turn camshaft in one direction by hand, and measure the camshaft runout on the dial gauge total indicator reading.





Camshaft Cam Height





1.Measure the camshaft cam height.





2.If wear is beyond the limit, replace the camshaft.
Camshaft Journal Clearance
Outer Diameter of Camshaft Journal





- Measure the outer diameter of the camshaft journal.





Inner Diameter of Camshaft Bracket





- Tighten the camshaft bracket bolts to the specified torque following the tightening pattern as shown.










- Using inside micrometer, measure inner diameter of camshaft bracket.





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





- When out of the specified range above, replace either or both the camshaft and the cylinder head assembly.
NOTE:
Inner diameter of the camshaft bracket is manufactured together with the cylinder head. If the camshaft bracket is out of specification, replace the whole cylinder head assembly.
Camshaft End Play





1.Install a dial gauge in the thrust direction on the front end of the camshaft. Measure the end play with the dial gauge while moving the camshaft forward and backward (in direction to axis).





2.If out of the specified range, replace with new camshaft and measure again.
3.If out of the specified range again, replace with new cylinder head assembly.
Camshaft Sprocket Runout
1.Install the camshaft in the cylinder head.
2.Install the camshaft sprocket on the camshaft.





3.Measure camshaft sprocket runout while turning the camshaft by hand.





4.If it exceeds the specification, 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.





- If out of the specified range, replace the valve lifter.





Valve Lifter Bore Inner Diameter
- Using inside micrometer, measure diameter of valve lifter bore of cylinder head.





- 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)





- If out of specified range, replace either or both valve lifter and cylinder head assembly.

INSTALLATION

1.Install the valve lifters, if removed.
- Install them in the same position from which they were removed.





2.Install the camshafts.
- The distinction between the intake and exhaust camshafts is in a difference of shapes of the back end:
Intake (B): Signal plate for the camshaft position sensor (PHASE)
Exhaust (A): Cone end shape





- Install camshafts so that the dowel pins on the front side are positioned as shown.





3.Install camshaft brackets.
- Install by referring to identification mark on upper surface mark.
- Install so that identification mark can be correctly read when viewed from the exhaust side.





- Install No. 1 camshaft bracket as follows.
- Apply sealant to No.1 camshaft bracket as shown.
-Use Genuine Silicone RTV Sealant, or equivalent. Refer to
Recommended Chemical Products And Sealants.

CAUTION:
- After installation, be sure to wipe off any excessive sealant leaking from part "A" (both on right and left sides).





- Apply sealant to camshaft bracket contact surface on the front cover backside.
- Apply sealant to the outside of bolt hole on front cover.





- Position the No.1 camshaft bracket near the mounting position, and install it without disturbing the sealant applied to the surfaces.





4.Tighten camshaft bracket bolts in four steps in the order as shown.






CAUTION:
After tightening camshaft bracket bolts, be sure to wipe off excessive sealant from the parts listed below.
- Mating surface of rocker cover.
- Mating surface of front cover, when installed without the front cover.





5.Install camshaft sprockets.
- Install them by lining up the mating marks on each camshaft sprocket with the ones painted on the timing chain during removal.
- Before installation of chain tensioner, it is possible to re-match the marks on timing chain with the ones on each sprocket.

CAUTION:
- Aligned mating marks could slip. Therefore, after matching them, hold the timing chain in place by hand.
- Before and after installing chain tensioner, check again to make sure that mating marks have not slipped.
6.Install chain tensioner.

CAUTION:
- After installation, pull the stopper pin off completely, and make sure that the tensioner is fully released.
7.Install chain guide.





8.Install IVT control cover with the following procedure.
a.Install IVT control solenoid valve to IVT control cover.
b.Install three O-rings to front cover side.

CAUTION:
Do not reuse O-rings.
c.Apply Genuine Silicone RTV Sealant to the positions as shown (A). Recommended Chemical Products And Sealants.

CAUTION:
- Installation should be done within 5 minutes after applying liquid gasket.
- Do not fill the engine with oil for at least 30 minutes after the IVT control cover is installed to allow the sealant to cure.





d.Install IVT control cover.
- Tighten the bolts in the numerical order as shown.
9.Check and adjust valve clearances. Testing and Inspection.
10.Installation of the remaining components is in the reverse order of removal.