V8 cylinder head gasket-new part

V8 CYLINDER HEAD GASKET-NEW PART

Model

Range Rover Discovery Defender

Affected vehicles

All V8 petrol derivatives from LH 647645 - LJ 081992 and LD 939976

Date

1994-05-21

Reference

21/05/94

Bulletin text

V8 Cylinder Head Gasket-New Part Introduction

MODEL AFFECTED VEHICLES

Range Rover All V8 petrol derivatives from LH 647645 - LJ 081992 and Discovery Defender LD 939976

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 gaskethas 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.

Note:This bulletin supersedes12/04/94/EN information in the parts box has been amended

ACTION REQUIRED

For customer complaints on previous gaskets consult Technical Bulletin 030/93. Issues arising from the new gasket should be submitted on a Product Report giving full vehicle details.

PARTS INFORMATION

New gasket:

ERR 4627 - 3.9 and 4.2 V8 ERR 4248 - 3.5 V8

New bolts

ERR 2943 - 14 off ERR 2944 - 6 off

Note: Outer row of bolts not required.

PROCEDURE

See procedure on following page

Issue 2 21/05/94

12/04/94/EN

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.

V8 Cylinder Head Gasket-New Part Introduction

MODEL AFFECTED VEHICLES

Range Rover All V8 petrol derivatives from LH 647645 - LJ 081992 and Discovery Defender LD 939976

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 free 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 below.

3.9/4.2

3.5

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.

21/07/94 12/04/94/EN

5) NEW CYLINDER HEAD BOLTS MUST ALWAYS BE FITTED. Check the bolt threads for damage, lightly oil the threads.There are two lenghts 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 squence shown to 20 Nm (15 lbf ft). 8) Tighten all bolts in sequence a further 90º (1/4 turn). 9).Tighten all bolts in sequence a final 90º (1/4 turn).