Cylinder Head - Revised Bolt Torque Procedures

9215subaru01

NUMBER: 02-85-91


DATE: 12-19-91


APPLICABILITY ALL 1985-1992 1.8L OHC ENGINES
ALL 1987-1992 1.2L JUSTY ENGINES

SUBJECT: REVISED CYLINDER HEAD BOLT TORQUE PROCEDURES





When replacing cylinder head gaskets on the above referenced engines, it is important to note that there is a required cylinder head bolt retorque procedure. Should this procedure not be performed, head gasket oil seepage may develop.

For 1.8 Liter OHC engines, install the cylinder heads and torque head bolts in the normal manner as outlined in the 1990 Loyale Service Manual Section 2-3, Page 38. After completing engine assembly, refer back to the Service Manual Section 2-2, Page 8, for cylinder head bolt retorquing procedures.

When reinstalling the cylinder head on 1.2 Liter Justy engines, the following revised head bolt torquing procedure must be followed.

1. Install the cylinder head on the crankcase with washers and head bolts. Tighten the bolts to the specified torque in the sequence as shown in Figure 1.

a. Tightening is done in 4 steps:

1) 39 N-m (4 Kg-m, 29 ft.lb.)
2) 73 N-m (7.5 Kg-m, 54 ft.lb.)
3) Back off the head bolts 90° or more in the reverse order of the tightening sequence.
4) 70-77 N-m (7.1-7.9 Kg-m, 51-57 ft.lb.)

2. Run the engine up to normal operating temperature. After the engine has cooled down, retorque head bolts to the specification noted in step 4.