Cylinder Head Assembly: Specifications

Cylinder Head

Warpage Cylinder head must be flat within 0.1 mm (0.004 in.).





NOTE: Ensure cylinder head bolt holes in the block are clean, dry (free of residual oil or coolant), and threads are not damaged.

NOTE: The Cylinder head bolts should be examined BEFORE reuse. If the threads are necked down, the bolts should 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 (2), the bolt should be replaced.

CAUTION: This engine was built with 2 different style cylinder head bolts. Each style bolt requires a different torque value. The bolts can be identified by the short bolt head (1) and the long bolt head (2).





Measure the bolt head from the washer to the top of the bolt head. The short bolt head (1) measures 8 mm (5/16") and the long bolt head (2) measures 13 mm (1/2").





If your bolt has the short head (1), use the following torque specifications:
- First: All to 30 Nm (25 ft. lbs.)
- Second: All to 61 Nm (45 ft. lbs.)
- Third: All to 61 Nm (45 ft. lbs.)
- Fourth: All an additional 90°

CAUTION: Do not use a torque wrench for the Fourth step.

If your bolt has the long head (2), use the following torque specifications:
- First: All to 30 Nm (25 ft. lbs.)
- Second: All to 73 Nm (54 ft. lbs.)
- Third: All to 73 Nm (54 ft. lbs.)
- Fourth: All an additional 90°

CAUTION: Do not use a torque wrench for the Fourth step.

Intake Manifold





Install intake manifold, tighten bolts to 25 Nm (220 in. lbs.) as shown.

Exhaust Manifold

Exhaust Manifold Bolts 34 Nm (25 ft.lbs.)

Camshaft Sprocket

Camshaft Sprocket Bolts
M6 9.5 Nm (85 in.lbs.)
M8 25 Nm (18 ft.lbs.)

Camshaft Bearing Caps

CAUTION: Install the front intake and exhaust camshaft bearing cap last. Ensure that the dowels are seated and follow torque sequence or damage to engine could result.

NOTE: If the front camshaft bearing cap is broken, the cylinder head MUST be replaced.





Install intake and exhaust camshaft bearing caps and slowly tighten bolts to 11 Nm (100 in. lbs.) in the sequence shown.




NOTE: Verify that the exhaust bearing shells are correctly installed, and the dowels are seated in the head, prior to tightening bolts.

Install the front intake and exhaust bearing cap and tighten bolts to 25 Nm (18 ft. lbs.) in the sequence shown.