Lt 230t transfer gearbox whine

LT 230T TRANSFER GEARBOX WHINE

Model

Discovery V8 Manual and Automatic derivatives for UK Market North American Specification European and Rest of World LJ LJ LJ

Affected vehicles

081991 to136970 081991 to 126065 081991 to 136970

Date

1995-03-15

Reference

15/03/95

Bulletin text

LT230t Transfer Gearbox Whine

MODEL

Discovery V8 Manual and Automatic derivatives for UK Market North American Specification European and Rest of World

DETAIL

A number of reports have been received that detail excessive whine from LT230t transfer gearboxes when operating the vehicle at motorway cruising speeds. Investigations by Land Rover engineers have found that this whine is caused by noise transmitted into the interior, rather than by an excessively noise transfer box, it can therefore, be ‘tuned’ out by fitting a modified transfer gearbox lever and knob. The modification includes the fitment of an attenuated (damped) gearlever and ‘heavy’ transfer gearlever knob. The new parts will considerably reduce the noise level transmitted into the vehicle. Heavy knob only fitted in Vin range 126155 to 136970. Atenuated gear lever and heavy gear lever knob fitted from 136970

NOTE: Manual and automatic derivatives manufactured from LJ 126155 are fitted with the ‘heavy’ gearknob and will only require to be fitted with the new atenuated lever, use kit STC 2945K. Vehicles prior to LJ 126155 will require kit STC 2915K. North American specification vehicles from LJ 126065 have been built to the improved condition

ACTION REQUIRED

Upon customer complaint of transfer gearbox whine at motorway cruising speeds fit the new parts following the procedure below. Do not replace the transfer box without first contacting Land Rover service

PARTS INFORMATION

STC 2915K gear lever kit-upto LJ 126155 ( this kit includes atenuated gear lever and heavy knob).

STC 2945K gear lever kit-from LJ 126156 ( this kit includes the atenuated gear lever only).

Sikaflex 221 sealant or similar. see bulletin 075/92/EN for information.

PROCEDURE

NOTE: Refer to section 41 transfer gearbox and section 76 Body of the workshop manual for full removal instructions.

1) Remove the centre console assembly, refer to section 76 of the workshop manual. 2) Manual gearbox derivatives only: Remove the gaiter from the bottom of the main gearlever and remove the gearlever. 3) Remove the gearbox tunnel gaiter plate and gaiter by drilling out the pop rivets; retain both parts for refitting. Automatic gearbox derivatives only: There is no need to remove the automatic selector mechanism. 4) Remove the high/low lever housing by firstly releasing the four fixings and lift the housing clear of the transfer gearbox.

ISSUE 2 15/03/95 44/02/95/EN

AFFECTED VEHICLES

LJ 081991 to136970 LJ 081991 to 126065 LJ 081991 to 136970

WARRANTY

Normal warranty policy and procedures apply.

COMP. CODE

3W8K

SRO

41.10.89/26 Fit new gearlever and knob 01.15 hour

LT230t Transfer Gearbox Whine

MODEL

Discovery V8 Manual and Automatic All manual derivatives North American Specification European and Rest of World

5) Clean the mating faces of the transfer gearbox and gear lever housing.

6) Strip down the gear lever housing to enable the transfer gear box lever to be removed.

7) Grease the pivot points of the new attenuated lever and assemble to the gearlever housing, ensure that the bend in the new lever faces towards the rear of the vehicle.

8) Refit the gearlever housing, fitting the new gasket supplied in the kit between the housing and gearbox.

9) Leave off the old high/low lever gaiter and its retaining plate. Replace the four fixing bolts back into the housing, (see illustration).

10) Prior to refitting the tunnel gaiter ensure that the mating cases are free from debris and metal particles from the previous drilling operation, apply Sikaflex 221 sealant or similar to gaiter mating faces to ensure a good seal.

11) Refit the gaiter plate with the new pop rivets.

12) Manual gearbox derivatives only; Refit the main gearlever.

13) Refit the centre console, refer to the workshop manual section 76.

14) Fit the modified High/Low lever knob (Vehicles upto VIN 126155 only) .

15) Road test the vehicle checking for correct operation of the High/low lever and positive engagement of transfer gears.

Care point: Make sure all gaiters and seals are undamaged and correctly fitted.

ISSUE 2 44/02/95/EN

AFFECTED VEHICLES

LP 081991 LJ 081991 to 126065 LJ 15/03/95 081991 LJ