Fastener Tightening Specifications

FASTENER TIGHTENING SPECIFICATIONS











NEW TIGHTENING METHOD BY USING PLASTIC REGION TIGHTENING BOLT
Plastic region tightening bolts are used in some parts of the engine. Install these bolts according to the method described in the body of the manual because the tightening method of these bolts are different from the conventional method. The service limit is determined for these bolts. Be sure to strictly follow the service limit described in the body of the manual.
^ Parts to be used
1. Cylinder head bolt
2. Bearing cap bolt
3. Connecting rod cap bolt
^ Tightening method
After tightening to the specified torque, further tighten 45° and 90°, or 180° (90° + 90°). Follow the tightening method described in the body of the manual because the tightening method differs from part to part.

CYLINDER HEAD BOLTS
Install new cylinder head bolts





Tighten cylinder head bolts in several steps to the specified torque according to the assembly order shown.
Specified torque 35 ± 2 Nm (26 ± 1 ft-lb)





Put a paint mark on all of cylinder head bolt heads and cylinder head.

CAUTION
^ When the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.
^ When the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedure.

Tighten the cylinder head 90° according to the tightening order.
Tighten it further 90° and make sure that the paint mark on the cylinder head bolt is in a straight line with that on the cylinder head.











Crankshaft Bearing Cap Bolt

Before using the crankshaft bearing cap bolt again, carry out the check according to the following procedure:
Measure the 2 points on the outside diameter of thread as shown in the illustration.
When the difference between the measured outside diameters is beyond the limit value, replace the crankshaft bearing cap bolt.

Limit value
M10: 0.15 mm (0.006 inch)
M8: 0.10 mm (0.004 inch)

Tighten crankshaft bearing cap bolts to the specified torque according to the tightening order.
Specified torque
M10 37.2 ± 2.0 Nm (27 ± 1 ft-lb)
M8 9.0 ± 2.0 Nm (80 ± 17 in-lb)

CAMSHAFT BEARING CAP





Tighten each camshaft bearing cap mounting bolt to the specified torque in the order of number shown in the figure in two or three steps.
Specified torque 12 ± 1 Nm (106 ± 8 in-lb)





Tighten each front camshaft bearing cap mounting bolt to the temporarily torque of 17 ± 3 Nm (14 ± 2 ft-lb) in the order shown 1).

Tighten each front camshaft bearing cap mounting bolt to the specified torque in the order shown 2).
Specified torque 30 ± 2 Nm (22 ± 1 ft-lb)

CONNECTING ROD CAP BOLT INSTALLATION
1. Check in the following procedure before reusing the connecting rod bolt.





1) Measure the outside diameter "A."
2) Measure the smallest outside diameter "B" within the range "X" shown in the illustration.
3) If the difference of outside diameter of thread exceeds the limit, replace the connecting rod bolt.

Limit: 0.10 mm (0.004 inch)

2. Apply engine oil to the threaded portion and seat surface of the bolt before installing it.
3. After installing each bolt and tightening it by fingers, tighten bolts alternately to properly assemble the cap.
4. Tighten the bolt in several steps until the torque reaches 5.0 Nm (44 in-lb).
5. Tighten the bolt in several steps until the torque reaches 20 Nm (15 ft-lb).





6. Put a paint mark on the bolt head as illustrated.
7. Put a paint mark on the connecting rod at 90° position in the tightening direction of the bolt with reference to the paint mark position of the bolt.

CAUTION
^ When the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.
^ When the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedure.

8. Tighten the bolt 90°, and make sure that the paint mark of the connecting rod is aligned with that of the bolt.

Flywheel





Tighten flywheel bolts to temporary torque 40 Nm (30 ft-lb) in the order shown in the illustration.

Tighten flywheel bolts to specified torque in the order shown in the illustration.

Tightening torque: 130 Nm (96 ft-lb)

INTAKE MANIFOLD
Intake manifold stay bolt 23 ± 6 Nm (17 ± 4 ft-lb)
Intake manifold nut 23 ± 6 Nm (17 ± 4 ft-lb)

THROTTLE BODY
Throttle body bolt 23 ± 6 Nm (17 ± 4 ft-lb)

Exhaust Manifold

Removal Steps 1-22:

Tightening Torque 49 ± 5 N-m (36 ± 3 ft-lb)

Water Pump
Water pump bolt 24 ± 3 Nm (18 ± 1 ft-lb)