Cylinder Head Assembly: Specifications

CYLINDER HEAD SURFACE VARIATION





Check cylinder head for flatness.
Cylinder head must be flat within:
- Standard dimension = less than 0.05 mm (0.002 inch)
- Service Limit = 0.2 mm (0.008 inch)
- Grinding Limit = Maximum of 0.2 mm (0.008 inch) is permitted.

CAUTION: 0.20 mm (0.008 inch) MAX is a combined total dimension of the stock removal limit from cylinder head and block top surface (Deck) together.

CYLINDER HEAD BOLT RE-USABILITY





The cylinder head bolts are torqued using the torque yield method, they should be examined BEFORE reuse. If the threads are necked down, the bolts must be replaced. Necking can be checked by holding a scale or straight edge against the threads. If all the threads do not contact the scale the bolt should be replaced.


CYLINDER HEAD BOLT TORQUE/SEQUENCE





1. Tighten the cylinder head bolts 1 - 8 in the sequence shown. Using the 4 step torque turn method, tighten according to the following values:
- Step 1: Bolts 1 - 8 to 61 Nm (45 ft. lbs.)
- Step 2: Bolts 1 - 8 to 88 Nm (65 ft. lbs.)
- Step 3: Bolts 1 - 8 (again) to 88 Nm (65 ft. lbs.)
- Step 4: Bolts 1 - 8 turn an additional 1/4 Turn. Do not use a torque wrench for this step.

NOTE: Bolt torque after 1/4 turn should be over 122 Nm (90 ft. lbs.). If not, replace the bolt.

2. Tighten head bolt number 9 to 33 Nm (25 ft. lbs.) after head bolts 1 - 8 have been tighten to specifications.

CAMSHAFT SPROCKET/GEAR SPECIFICATIONS

Camshaft Sprocket Bolt 40 ft. lbs.

EXHAUST MANIFOLD SPECIFICATIONS

Exhaust Manifold Bolts 200 in. lbs.
Exhaust Crossover Pipe Bolts 40 ft. lbs.

INTAKE MANIFOLD SPECIFICATIONS

Lower Intake Manifold





1. Tighten intake manifold end seal retainer screws to 12 Nm (105 in. lbs.).





2. Torque lower intake manifold bolts and to 1 Nm (10 in. lbs.). Then torque bolts to 22 Nm (200 in. lbs.) in sequence shown. Then torque again to 22 Nm (200 in. lbs.).





Upper Intake Manifold




Tighten intake manifold bolts to 12 Nm (105 in. lbs.)


Throttle Body Specifications

Throttle Body Mounting Bolts 11.8 Nm (105 ± 20 in. lbs)

NOTE: The composite manifolds uses special Plastic screws. The factory installed Plastic screws can be removed and installed up to 5 times. Do not exceed the specified torque. These screws must be installed slowly (less than 600 rpms) to avoid melting the parent material. There are service repair screws available for repair. They require a higher torque than the original screws.