Cylinder Head Gasket - Revised Part
11/03/9412/03/94/US
SUBJECT
V8 Cylinder Head Gasket-New Part Introduction
AFFECTED VEHICLES
All V8 petrol derivatives from LH 647645 - LJ 081992 and
LD 939976
MODEL
Range Rover
Discovery Defender
DETAIL
A new cylinder head gasket and head bolts has been introduced from the above VIN numbers. The gasket is of composite construction with stainless steel fire rings and bolt eyelets. The outer row of cylinder head bolts have been deleted with the introduction of this gasket. The cylinder head height has been modified to compensate for the increased thickness of the new gasket. New bolts must be fitted when a gasket has been replaced.
A new tightening procedure is also introduced and should be precisely followed when fitting the new gasket.
NOTE: The new part should not be fitted to vehicles prior to the above vins, due to the different bolt arrangement and increased thickness of gasket.
ACTION REQUIRED
For customer complaints on previous gaskets consult Technical Bulletin 030/93. Issues arising from the new gasket should be submilled on a Product Report giving full vehicle details.
PARTS INFORMATION
New gasket:
ERR 4627 - 3.9 and 4.2 V8
ERR 4246 - 3.5 V8
New bolts
ERR2943 - 14 off
ERR2944 - 6 off
Note:
Outer row of bolts not required.
WARRANTY
Normal warranty policy and procedures apply
COMP. CODE
1S6N
SRO
Refer to individual Service Operation Times identified in the appropriate manual to suit the derivative or model.
Procedure
1) Remove the cylinder heads following the instructions in the Workshop Manual section 12, inspect the cylinder block face, cylinder bores and bolt holes are tree from debris.
2) Select the appropriate gasket for the type of engine ie: 3.5/3.9 or 4.2. This can be identified by the identification holes in the gasket, 3.5 has one hole, 3.9/4.2 has 2 holes. See illustration.
3) Fit and position the gasket on the dowels ensuring that the word TOP is uppermost. Do not flex or bend the gasket.
4) Ensure the gasket and cylinder head face are clean and free from grease and debris, carefully fit the cylinder head.
5) NEW CYLINDER HEAD BOLTS MUST ALWAYS BE FITTED. Check the bolt threads for damage, lightly oil the threads. There are two lengths of bolt which must be fitted to the appropriate position as shown in the illustration.
Flange bolt length 66 mm is fitted to holes 2,4,6,7,8,9 and 10.
Flange bolt length 96 mm is fitted to holes 1,3 and 5.
6) Lightly tighten all bolts in the numbered sequence shown above.
7) Tighten all bolts in the sequence shown to 20 Nm (15 lbf ft).
8) Tighten all bolts in sequence a further 90° (1/4 turn).
9). Tighten all bolts in sequence a final 90° (1/4 turn).