Engine Coolant Leak At Coolant Pump (LTB00352V8)

WARNING: This page is about the LR4 Base, which is a different variant/trim than selected.

Publication date: 2015-09-09
Reference number: LTB00352V8
Supersedes refnos: LTB00352, LTB00352 ISSUE2, LTB00352NAS6

ENGINE COOLANT LEAK AT COOLANT PUMP

TECHNICAL SERVICE BULLETIN

Reference Number(s): LTB00352v8, Date of Issue: September 09, 2015

LAND ROVER:	2014 Range Rover Sport (LW); 2013-2014 Range Rover (LG); 2010-2013 Range Rover Sport (LS); 2010-2015 Discovery 4 / LR4 (LA); 2010-2012 Range Rover (LM)
SECTION:	303-03
AFFECTED VEHICLES:	Range Rover Sport (LW) Model Year: 2014 VIN: EA000001-EA504011 Manufacturing Plant: Solihull Engine: V6 S/C 3.0L Petrol V8 S/C 5.0L Petrol; Range Rover (LG) Model Year: 2013-2014 VIN: DA000001-EA196951 Manufacturing Plant: Solihull Engine: V6 S/C 3.0L Petrol V8 5.0L Petrol V8 S/C 5.0L Petrol; Range Rover Sport (LS) Model Year: 2010-2013 VIN: AA212145-DA814822 Manufacturing Plant: Solihull Engine: V8 5.0L Petrol V8 S/C 5.0L Petrol; Discovery 4 / LR4 (LA) Model Year: 2010-2015 VIN: AA510178-FA741168 Manufacturing Plant: Solihull Engine: V6 S/C 3.0L Petrol V8 5.0L Petrol; Range Rover (LM) Model Year: 2010-2012 VIN: AA304426-CA393639 Manufacturing Plant: Solihull Engine: V8 5.0L Petrol V8 S/C 5.0L Petrol

Superceded Bulletin(s): LTB00352v7/2015, Date of Issue: April 21, 2015

NOTE: This bulletin supersedes TSB LTB00352v7/2015 dated 21 APR 2015, which should either be destroyed or clearly marked to show it is no longer valid (e.g. with a line across the page). Only refer to the electronic version of this Technical Bulletin in TOPIx.

CONDITION SUMMARY

Situation:

A customer may express a concern that there is a low coolant level warning message, or experience an abnormal noise from the engine. On inspection of the customer report, or during regular maintenance, the technician identifies a major coolant leak at the front of the engine driven coolant pump together with excessive wear of the coolant pump bearing.

This version has been issued to change to the causal part number.

NOTE: During normal operation, a small amount of coolant may temporarily weep through the pump seals or from the evaporation chamber. This will be visible as dry coolant residue on the coolant pump body and surrounding area. This does not affect the operation of the coolant pump or the cooling system, and it does not damage the coolant pump. A small amount of dry coolant residue on the coolant pump body, pulleys, belts, or around the front of the engine are not alone sufficient justification for changing a coolant pump.

Cause: Coolant ingress into the bearing housing leads to corrosion of the bearing and incorrect support for the impeller shaft. This in turn causes accelerated wear of the mechanical flat face seal leading to coolant loss sufficient to generate a low coolant level warning message in the Instrument Pack display, this can manifest as a noise from the pump, free play in the pulley, or a grinding/rumbling feel when rotating the pulley by hand.

Suggested Customer Concern Code - MG3.

Action: Should a customer express this concern, follow the Service Instruction outlined below.

WARRANTY

NOTE: Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to TOPIx to obtain the latest repair time.

NOTE: DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.

DESCRIPTION	SRO	TIME	CONDITION CODE	CAUSAL PART
Range Rover - N/A - Coolant Pump Bearing Diagnostics	26.50.89.27	0.3	42	LR055239
Range Rover - SC - Coolant Pump Bearing Diagnostics	26.50.89.27	0.3
Range Rover Sport - N/A - Coolant Pump Bearing Diagnostics	26.50.89.27	0.4
Range Rover Sport - SC- Coolant Pump Bearing Diagnostics	26.50.89.27	0.4
Renew - Discovery 4/LR4 - N/A - Coolant Pump Bearing Diagnostics	26.50.89.27	0.3
Renew - Discovery 4/LR4 - SC - Coolant Pump Bearing Diagnostics	26.50.89.27	0.3
New Range Rover Sport - SC - Coolant Pump Bearing Diagnostics	26.50.89.27	0.3
Coolant Pressure Test - All Vehicles	26.10.07	0.2

NOTE: Normal Warranty procedures apply.

SERVICE INSTRUCTION

NOTE: Check the parts catalogue to make sure the repair is made at the correct level. Coolant pump, cooling system gaskets and seals are available through the parts catalogue. These parts should be used whenever possible rather than fitting complete assemblies.

NOTE: In all cases, please write this TSB reference in the technician comments on the warranty claim and on the parts return tag (if applicable). Parts may be subject to investigation.

Check the coolant expansion tank level and message centre for a low coolant warning and record on the job card. With the engine cold, top up the coolant as required to the maximum level in the coolant expansion tank, record the quantity of coolant required to top up the expansion tank to maximum level on the job card.

The current step will specify what to do next depending on where the vehicle identification number (VIN) of the current vehicle falls within the following assured VINs list below.

If the vehicle was manufactured before the assured VIN in the table below, a new pump should only be installed if the pump shows clear signs of leakage, and Steps 4-6 have been carried out. Install the coolant pump (see TOPIx Workshop Manual section 303-03). Do not continue with the rest of this service instruction.
If the vehicle was manufactured after the assured VIN in the table below, then go to the next step of this service instruction.

V6 Supercharged 3.0L Petrol

Model Code	Model Name (engine)	Assured VIN
LA - L319	Discovery (V6)	EA680828
LG - L405	Range Rover (V6)	EA110440
LW - L494	Range Rover Sport (V6)	EA000011

V8 5.0L Petrol and V8 Supercharged 5.0L Petrol

Model Code	Model Name (engine)	Assured VIN
LA - L319	Discovery (V8)	CA618233
LM - L322	Range Rover (V8)	CA376755
LG - L405	Range Rover (V8)	DA000010
LS - L320	Range Rover Sport (V8)	CA742657
LW - L494	Range Rover Sport (V8)	EA000002

On the current coolant pump there may be some signs of leakage, such as dry coolant residue, but this is not a reason to replace the coolant pump. It is necessary to check the coolant pump for an abnormal noise from the bearings, free play in the pulley, or a grinding/rumbling feel when rotating the pulley by hand see Steps 7-9.
If there is low coolant in the expansion tank and or a low coolant message from the message centre, continue with the next step of this Service Instruction to identify the source of the leak. If a leak is located this must be claimed as a separate Warranty Claim.
NOTE: 1-1.5 PSI pressure drop is normal, and does not indicate a system leak. An air leak may also be present in the pressure test equipment.
Carry out a cooling system pressure test to 1 bar (15 PSI) for 5 minutes. Record the pressure drop on the job card.
If there is a cooling system pressure drop of more than 1.5 PSI, then investigate the system for fresh (wet) leaks and record on the job card. A UV light may be helpful as there is UV dye in the coolant. If there is fresh coolant dripping from the pump - this indicates a leak.
Coolant pump bearing check procedure:
Slacken the primary drive belt tensioner and move the primary drive belt to one side.
Hold the coolant pump pulley firmly and rock it up and down by hand.
- Feel for excessive play.
- Rotate the pulley a 1A turn and repeat the check. Do this check twice more.
- Record the results on the job card.
Spin the pulley and feel for roughness and record the results on the job card. Check for free play on the coolant pump pulley shaft and record the results on the job card.
The coolant pump should only be replaced where there are signs of free-play, excessive noise, or grinding/rumbling in the bearing (see TOPIx Workshop Manual section 303-03). Make sure that any repair is completed at the lowest possible component level - for example replacing gaskets and seals where appropriate rather than higher level assemblies.