Defender 90 (LD) V8-4.0L (1997)
Cylinder Head Gasket: Technical Service Bulletins
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.