1. Component views
Camshaft
Part name
- Exhaust camshaft
- Camshaft upper bracket
- M8 bolt
- M6 bolt
- Inlet camshaft
Tightening torque
3: 18 N・m { 1.8 kgf・m / 13 lb・ft } Wet
4: 7.0 N・m { 0.7 kgf・m / 62 lb・in } Dry
4: 6.0 N・m { 0.6 kgf・m / 53 lb・in } Wet
2. Camshaft installation
1) Rotate the crankshaft in the forward direction (clockwise) to align the No. 1 cylinder piston to compression top dead center.
Legend
- Top dead center alignment mark on the gear case cover side
- Crankshaft pulley side top dead center alignment mark
2) Apply the engine oil to the camshaft journal.
3) Install the camshaft to the camshaft brackets with the inlet camshaft and exhaust camshaft markings upward.
Caution
- Check the marking on the camshaft upper bracket.
4) Align the camshaft timing marks with idle gear D.
Caution
- Loosen the rocker arm adjust nut in advance and loosen the adjust screw by 2 pitch or more.
Legend
- Exhaust camshaft gear
- Inlet camshaft gear
- Idle gear D
5) Apply engine oil to the following parts.
- Camshaft upper bracket sliding surface
- Camshaft journal
- Threaded portion and seating surface of bolts
6) Align the inlet camshaft and exhaust camshaft alignment marks with the camshaft upper bracket.
Caution
- Confirm that the valve cap is correctly installed to the valve stem end.
- Check that the valve cap does not come off or ride up.
Legend
- Alignment mark
7) Temporarily tighten the camshaft upper bracket M8 bolts to the cylinder head in the order shown in the diagram.
Caution
- Check the marking on the top surface.
8) Final tighten the camshaft upper bracket M8 bolts to the cylinder head in the order shown in the diagram.
Tightening torque: 18 N・m { 1.8 kgf・m / 13 lb・ft } Wet
9) Temporarily tighten the camshaft upper bracket M6 bolts to the camshaft brackets in the order shown in the diagram.
10) Final tighten the camshaft upper bracket M6 bolts to the camshaft brackets in the order shown in the diagram.
Tightening torque: 7.0 N・m { 0.7 kgf・m / 62 lb・in } Dry
Tightening torque: 6.0 N・m { 0.6 kgf・m / 53 lb・in } Wet
11) Remove the lock bolt from the camshaft gear.
3. Rocker arm adjustment
1) Rotate the crankshaft in the forward direction (clockwise) to align the No. 1 cylinder piston to compression top dead center.
Legend
- Top dead center alignment mark on the gear case cover side
- Crankshaft pulley side top dead center alignment mark
2) Loosen the adjust screw of the rocker arm using the special tool.
SST: 5-8840-2822-0 - valve clearance adjust nut wrench
Legend
- Screwdriver
- Ring spanner
- 5-8840-2822-0
3) Insert a feeler gauge between the rocker arm roller and the cam.
Note
- Tighten the rocker arm adjust screw, and adjust the valve clearance to the standard value.
Standard: 0.15 mm { 0.0059 in } When cold
4) Lightly tighten the adjust screw with the feeler gauge inserted using the special tool.
Legend
- Cam (Exhaust side)
- Cam (Inlet side)
- Roller (Inlet side)
- Roller (Exhaust side)
5) Verify that the movement of the feeler gauge becomes stiff.
6) Secure the rocker arm adjust screw with the adjust screw nut.
Tightening torque: 18 N・m { 1.8 kgf・m / 13 lb・ft }
| Cylinder position |
#1 |
#2 |
#3 |
#4 |
||||
| IN |
EX |
IN |
EX |
IN |
EX |
IN |
EX |
|
| No. 1 cylinder compression top dead center |
○ |
○ |
○ |
○ |
||||
| No. 4 cylinder compression top dead center |
○ |
○ |
○ |
○ |
||||
7) Rotate the crankshaft for 1 turn, and adjust any remaining valve clearance.
4. Baffle plate installation
1) Install the baffle plate to the cylinder head.
Tightening torque: 10.0 N・m { 1.0 kgf・m / 89 lb・in }
