JTB00278NAS2

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TECHNICAL BULLETIN
JTB00278NAS2
31 MAR 2014
© Jaguar Land Rover North America, LLC
NOTE: The information in Technical Bulletins is intended for use by trained, professional Technicians with the knowledge, tools,
and equipment required to do the job properly and safely. It informs these Technicians of conditions that may occur on some
vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by 'do-ityourselfers'. If you are not a Retailer, do not assume that a condition described affects your vehicle. Contact an authorized
Jaguar service facility to determine whether this bulletin applies to a specific vehicle.
This reissue replaces all previous versions. Please destroy all previous versions. Only refer to the
electronic version of this Technical Bulletin in TOPIx.
Changes are highlighted in gray
SECTION: 303-03
Coolant Pump Diagnostics
AFFECTED VEHICLE RANGE:
F-TYPE (X152)
Model Year:
VIN:
2014 Onwards
K00001 Onwards
XF (X250)
Model Year:
VIN:
2010 Onwards
R47154 Onwards
Engine:
V6 S/C 3.0L Petrol
V8 5.0L Petrol
V8 S/C 5.0L Petrol
XJ Range (X351)
Model Year:
2010 Onwards
VIN:
V00047 Onwards
XK Range (X150)
Model Year:
2010 Onwards
VIN:
B32753 Onwards
MARKETS:
NAS
CONDITION SUMMARY:
Situation: The fluid level in the engine coolant system expansion tank may fall below the minimum level over a
period of time or a ‘Low coolant level’ message is displayed in the message center. Upon inspection, a leak may
be found to be from the front of the engine-driven coolant pump, together with excessive wear of the coolant
pump bearing.
NOTE: The coolant pump can display some dry coolant residue on the pump body and surrounding
area during normal operation. A small amount of coolant may temporarily weep through the pump
seals or from the evaporation chamber. This does not affect the operation of the pump or the cooling
system and does not damage the coolant pump. A small amount of dry coolant residue on the pump
body, pulleys, belts, or around the front of the engine is not alone sufficient justification for changing a
coolant pump.
Cause: This may be caused by coolant ingress into the coolant pump bearing housing, leading to corrosion of the
bearing and incorrect support for the impeller shaft, leading to accelerated wear of the mechanical flat face of the
seal and a coolant loss sufficient to display the warning message.
Action: Should a customer express this concern, follow the Service Instruction outlined below.
PARTS:
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No Parts Required
TOOLS:
Refer to Workshop Manual for any required special tools.
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
(HOURS)
CONDITION
CODE
CAUSAL
PART
Coolant pump bearing diagnostics - F-TYPE
26.50.08
0.3
42
C2Z21781
Coolant pump bearing diagnostics - XF - 3.0L SC,
5.0L NA, 5.0L SC
26.50.08
0.3
42
C2Z21781
Coolant pump bearing diagnostics - XJ
26.50.08
0.3
42
C2Z21781
Coolant pump bearing diagnostics - XK - 5.0L NA
26.50.08
0.5
42
C2Z21781
Coolant pump bearing diagnostics - XK - 5.0L SC
26.50.08
0.4
42
C2Z21781
Coolant Pressure Test - All
26.10.07
0.2
42
C2Z21781
NOTE: Normal Warranty policies and procedures apply.
SERVICE INSTRUCTION:
NOTE: The coolant pump can display some dry coolant residue on the pump body and surrounding
area during normal operation. A small amount of coolant may temporarily weep through the pump seals
or from the evaporation chamber. This does not affect the operation of the pump or the cooling system
and does not damage the coolant pump. A small amount of dry coolant residue on the pump body, pulleys,
belts, or around the front of the engine is not alone sufficient justification for changing a coolant pump.
1.
NOTE: Acceptable Coolant Pump Witness
Marks
Check the coolant pump for witness marks before
continuing:

 Note the severity of any witness marks on the
repair order.
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2. Check the expansion tank level and message center for a low coolant warning; record on the repair order.

 If there is low coolant in the expansion tank and/or a low coolant message from the message center,
continue to next step.
• Any leak located must be carried out as a separate claim.
3. Top up the coolant to the correct level.
4.
NOTE: A 1.0-1.5 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 (if any) on the repair order.

 If there is a cooling system pressure drop of more than 1.5 PSI, investigate the system for fresh wet leaks
and record on the repair order. A UV light may be helpful as there is a UV dye in the coolant.
• Fresh wet coolant dripping from the pump indicates a leak. Repair as required; to be carried out as
a separate claim.
• Coolant residue is normal and does not indicate a leak; continue to the next step.
5. If no leak is found starting the engine from cold, listen for unusual noise (moaning, groaning, rumbling,
grinding):

 Record results on the repair order.
6. Stop the engine; slacken the auxiliary drive belt tensioner and slip the auxiliary drive belt to one side.
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7. Hold the coolant pump pulley firmly and rock it up and down by hand:

 Feel for excessive play;

 Rotate the pulley ¼ turn and repeat the rocking motion a few times;

 Record the results on the repair order.
8. Spin the pulley and feel for roughness:

 Record the results on the repair order.
9. If there is excessive play or roughness in the pulley bearing, refer to TOPIx Workshop Manual section 303-03
and replace the coolant pump; to be carried out as a separate claim.
http://topix.jaguar.jlrint.com/topix/service/document/465350
3/31/2014