What are the signs of a failure in the water pump on Mercury Mariner?

A failure in the water pump can cause serious engine damage due to overheating. If a failure occurs in the pump seal, coolant will leak from the front cover (four cylinder models) or the water pump housing (V6 models). Water pumps are equipped with weep or vent holes. It is possible to check the water pump weep hole using a flashlight. If a failure occurs in the pump seal, coolant will leak from the hole. Use the flashlight to find the vent hole on the water pump and check for leaks. If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running. With the engine off, shaft wear can be felt if the water pump pulley is rocked up-and-down. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure. A quick water pump performance check is to put the heater on. If the pump is failing, it won't be able to efficiently circulate hot water all the way to the heater core as it should.

How to replace a water pump in a Mercury Mariner?

Disconnect the cable from the negative battery terminal. Drain the cooling system. Remove the drivebelt on four cylinder models or the water pump drivebelt on V6 models. Loosen the right front wheel lug nuts. Raise the vehicle and secure it on jackstands. Remove the right front wheel and the fender splash shield. Remove the water pump pulley. Remove the bolts attaching the water pump to the engine block and remove the pump from the engine. If the water pump is stuck, gently tap it with a soft faced hammer to break the seal. Clean the bolt threads and the threaded holes in the engine and remove all corrosion and sealant. Remove all traces of old gasket material from the sealing surfaces. Remove the air filter housing. Remove the water pump drivebelt tensioner. Remove the water pump mounting bolts. Clean all the gasket and 0-ring surfaces on the pump and the housing. Remove the outlet air duct from the air filter housing. Remove the water pump drivebelt. Remove the lower radiator hose from the thermostat housing. Remove the three mounting bolts, then separate the water pump from the housing. Discard the water pump gasket. Clean the sealing surfaces of the housing and the pump. Remove all traces of old gasket. Compare the new pump to the old one to make sure that they're identical. Apply a thin film of ATV sealant to hold the new gasket in place during installation. Install the water pump bolts and tighten them to the torque listed in the specifications. The remainder of installation is the reverse of removal. Refill the cooling system. Reconnect the battery. After you're done, the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimum driveability and performance. Operate the engine to check for leaks.

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11 Water Pumps found

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Mercury Mariner Pump Assembly - Water
Part Number: 4S4Z-8501-AA
$55.55 MSRP: $91.82
You Save: $36.27 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Replaced by: 4S4Z-8501-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2011 Mercury Mariner | 4 Cyl 2.3L, 4 Cyl 2.3L Hybrid Gas/Electric DOHC, 4 Cyl 2.5L Duratec (110kW/150PS), 4 Cyl 2.5L PFI Gas/Electric | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 9L8Z-8501-A
$87.01 MSRP: $143.82
You Save: $56.81 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water; Water Pump
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 5M8Z-8501-B
$128.70 MSRP: $212.73
You Save: $84.03 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Manufacturer Note: Water Pump Driven By Exhaust Camshaft
- Replaced by: EU2Z-8501-D
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 2S7Z-8501-BG
$79.31 MSRP: $131.09
You Save: $51.78 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Replaced by: EU2Z-8501-C
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 5M8Z-8501-A
$128.70 MSRP: $212.73
You Save: $84.03 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Manufacturer Note: Water Pump Driven By Exhaust Camshaft
- Replaced by: EU2Z-8501-D
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly
Part Number: 9M6Z-8C419-A
$157.32 MSRP: $250.91
You Save: $93.59 (38%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy; Auxiliary Pump, Water Pump
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | 4 Cyl 2.5L PFI Gas/Electric | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Pump Assembly
Part Number: 6M6Z-8C419-A
$194.36 MSRP: $312.73
You Save: $118.37 (38%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy
- Replaced by: 5M6Z-8501-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2008 Mercury Mariner | 4 Cyl 2.3L Hybrid Gas/Electric DOHC | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 1S7Z-8501-AK
$55.55 MSRP: $91.82
You Save: $36.27 (40%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Manufacturer Note: #1S7G 8501-AL - includes 1S7Z-8507-AE gasket
- Replaced by: 4S4Z-8501-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005 Mercury Mariner | 4 Cyl 2.3L | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 5L8Z-8501-A
$79.31 MSRP: $131.09
You Save: $51.78 (40%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Pump Assy - Water
- Replaced by: EU2Z-8501-C
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 5L8Z-8501-AA
Product Specifications
- Other Name: Pump Assy - Water; Water Pump, Water Pump Assembly
- Manufacturer Note: Water Pump Driven By Intake Camshaft
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005 Mercury Mariner | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
View related parts
Mercury Mariner Pump Assembly - Water
Part Number: 9L8Z-8501-C
Product Specifications
- Other Name: Pump Assy - Water; Water Pump Assembly, Water Pump Housing
- Replaces: 9L8Z-8501-B
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive

Mercury Mariner Water Pump Parts Questions & Experts Answers

Pump Assembly
9M6Z-8C419-A
Q: What are the signs of a failure in the water pump on Mercury Mariner?
A: A failure in the water pump can cause serious engine damage due to overheating. If a failure occurs in the pump seal, coolant will leak from the front cover (four cylinder models) or the water pump housing (V6 models). Water pumps are equipped with weep or vent holes. It is possible to check the water pump weep hole using a flashlight. If a failure occurs in the pump seal, coolant will leak from the hole. Use the flashlight to find the vent hole on the water pump and check for leaks. If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running. With the engine off, shaft wear can be felt if the water pump pulley is rocked up-and-down. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure. A quick water pump performance check is to put the heater on. If the pump is failing, it won't be able to efficiently circulate hot water all the way to the Heater Core as it should.
Pump Assembly - Water
5L8Z-8501-AA
Q: How to replace a water pump in a Mercury Mariner?
A: Disconnect the cable from the negative battery terminal. Drain the cooling system. Remove the drivebelt on four cylinder models or the water pump drivebelt on V6 models. Loosen the right front wheel lug nuts. Raise the vehicle and secure it on jackstands. Remove the right front wheel and the fender splash shield. Remove the water pump pulley. Remove the bolts attaching the water pump to the engine block and remove the pump from the engine. If the water pump is stuck, gently tap it with a soft faced hammer to break the seal. Clean the bolt threads and the threaded holes in the engine and remove all corrosion and sealant. Remove all traces of old gasket material from the sealing surfaces. Remove the air filter housing. Remove the water pump drivebelt tensioner. Remove the water pump mounting bolts. Clean all the gasket and 0-ring surfaces on the pump and the housing. Remove the outlet air duct from the air filter housing. Remove the water pump drivebelt. Remove the lower radiator hose from the thermostat housing. Remove the three mounting bolts, then separate the water pump from the housing. Discard the water pump gasket. Clean the sealing surfaces of the housing and the pump. Remove all traces of old gasket. Compare the new pump to the old one to make sure that they're identical. Apply a thin film of ATV sealant to hold the new gasket in place during installation. Install the water pump bolts and tighten them to the torque listed in the specifications. The remainder of installation is the reverse of removal. Refill the cooling system. Reconnect the battery. After you're done, the Powertrain Control Module (PCM) must relearn its idle and fuel trim strategy for optimum driveability and performance. Operate the engine to check for leaks.

Related Mercury Mariner Parts

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