System Specifications

Cylinder Head

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






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").
Identify whether your engine has the short head design (1) or the long head design (2).




NOTE: The front two cylinder head bolts do not have captured washers. The washers must be installed with the bevel up towards the bolt head.





Before installing the bolts, the threads should be lightly coated with engine oil.
Install the cylinder head bolts and tighten in the sequence shown.




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.) in the sequence shown.

Exhaust Manifold





Tighten the exhaust manifold bolts to 34 Nm (25 ft. lbs.) in the sequence shown.

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 9.5 Nm (85 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 torquing bolts.

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