Cylinder Block - Interchangeability

NO.
12/02/96/US

DATE
07/26/96

SUBJECT
Cylinder Block Interchangeability

AFFECTED VEHICLES
LH Up to 647645
LD Up to 939976

MODEL
Range Rover Classic
Defender

DETAIL
During 1995, production of cylinder blocks compatible with the old design of cylinder head gaskets ceased. This old condition utilized 3 rows of cylinder head bolts, instead of the current 2, to attach the cylinder head to the block. Only 2 row head bolt blocks are now available. Should a replacement cylinder block assembly be required for a vehicle built prior to the VIN range above, follow the procedure below for block requirements.

ACTION REQUIRED
Should any service repair be required on above affected vehicles requiring a new engine block or new head gasket, follow procedure below.

PARTS INFORMATION
New cylinder head gasket
ERR5437 - head gasket

New bolts
ERR2943 - 13 qty.
ERR2944 - 6 qty.

PROCEDURE

Refer to Workshop Manual section 12.

When refitting old 3 row bolt heads to a new 2 row cylinder block:





^ Check cylinder heads for a nominal dimension of 0.903 inches (see illustration). If necessary, both the cylinder heads may be milled down to no less than 0.893 inches. This will optimize the compression ratio with the new composite gaskets, but is not absolutely necessary.

IMPORTANT: This repair is for both cylinder heads to ensure equal compression ratio across the engine.

^ Refit cylinder heads with new composite gaskets.

^ For engines which have the combined cylinder head bolt/alternator mounting stud, re-use the old stud torqued to 65-70 ft.lbs (88-95 Nm) with the new gasket. New stretch bolts tightened in the correct sequence should be used in all remaining head bolt holes.

WARRANTY
Normal warranty policy and procedure apply

COMP. CODE
1S6N

SRO
Not Applicable