Inlet manifold valley gasket-leak

INLET MANIFOLD VALLEY GASKET-LEAK

Model

New Range Rover V8 Derivatives Range Rover Classic V8 Derivatives Discovery V8 Derivatives Defender V8 Derivatives

Affected vehicles

upto 336880 upto 664120 upto 524844 and 194052 upto 986871

Date

1996-09-18

Reference

18/09/96

Bulletin text

Inlet Manifold Valley Gasket- Leak

MODEL

New Range Rover V8 Derivatives Range Rover Classic V8 Derivatives Discovery V8 Derivatives Defender V8 Derivatives

DETAIL

There has been a small number of cases of inlet manifold/valley gasket leaks, following investigations, it has been found that the torque down procedure did not fully compress the Wolverine gasket material. Land Rover have introduced a two stage torque down procedure, to ensure that full compression is achieved.

Note: This bulletin supersedes 12/09/96 the information in the SRO section has been amended

ACTION REQUIRED

If a coolant/air leak is detected from the valley gasket region follow the procedure detailed below, only replace the valley gasket in the event of a leak that cannot be rectified by the re-torque procedure.

PARTS INFORMATION

Not applicable

PROCEDURE

Refer to the workshop manual section 12.

1. Loosen all inlet manifold/valley gasket bolts and clamp bolts.

2. Tighten clamp bolts at front and rear of gasket to 0.5 Nm-1.0 Nm (0.4-0.7 lbft) torque.

3. Tighten the 12 off inlet manifold/cylinder head bolts to a torque of 30 Nm (21 lbft).

4. After a minimum period of 5 minutes to allow bedding in of the gasket, re-tighten all inlet manifold/cylinder head bolts to a torque of 47-54 Nm (35-40 lbft) using a standard torque wrench.

5. Tighten clamp bolts at front and rear of gasket to 14-20 Nm (10-15 lbft). 6. Remove any surplus water from valley area. Refer to the illustration opposite, which details the bolt tightening sequence.  Rover Group 1996

Issue 2 18/09/96

12/09/96/EN

AFFECTED VEHICLES

LP upto 336880 LH upto 664120 LJ upto 524844 and 194052 LD upto 986871

WARRANTY

Normal warranty policy and procedures apply

COMP. CODE

2U1N

SRO

30.15.08 Induction manifold gasket renew 2.50 hour (New Range Rover).

30.15.02 Induction manifold gasket renew 2.05 hour (Discovery).