Datsun Head Bolts Torque Specs and Sequence

The information on this page applies to the Datsun L16, L18, and L20B engine.

The following describes the location of the short and long cylinder head bolts
There are 10 Head Bolts in total; Long bolts and Short bolts

REAR OF ENGINE

short        long

short        long

short        short

short        long

short        long

FRONT OF ENGINE

The following describes the Loosening sequence for the engine.

LOOSEN

REAR OF ENGINE

2         1

6         5

10       9

8         7

4         3

FRONT OF ENGINE

Loosen the bolts gradually in the sequence shown. Do multiple passes and start with 1/8 of a turn for each bolt to ensure proper removal.


The following describes the torque sequence and torque specs for the engine.

TIGHTEN

REAR OF ENGINE

10        9

6          5

2          1

4          3

8          7

FRONT OF ENGINE

Torque all bolts to 20 ft-lb, first pass

Torque all bolts to 40 ft-lb, second pass

Torque all bolts to final 60 ft-lb, third pass

Torque all bolts to 60 ft-lb, fourth pass

Torque all bolts to 60 ft-lb, fifth pass