Section 4.3 Water Pump (Front Mounted) (Fm)

The centrifugal-type water pump circulates the engine coolant with the cylinder block, cylinder head, radiator and also the oil cooler. See number "Front mounted Water Pump " .‪

The pump is placed on the prior of the engine gear situation cover top top units constructed prior to 6R037024 and is thrust by the water pump journey gear. The water pump drive gear meshes through the bull gear.‪


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Figure 1. Front placed Water Pump

An impeller is pressed on one finish of the stainless steel drive shaft. The other end of this shaft has actually internal threads, and a retaining bolt secures the water pump drive equipment to the shaft. Two identical roller bearing assemblies are offered to lug the obelisk See figure "Front an installed Water Pump Details and Relative place of parts " .‪


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1. Locknut‪

12. Journey Shaft‪

2. Gear, Water Pump Drive‪

13. Water Seal‪

3. Snap Ring‪

14. Impeller‪

4. Bearing Race‪

15. Seal Ring, Water Pump Cover‪

5. Roller Bearing, Larger‪

16. Bolt, Cover-to-housing‪

6. Spacer rings (2)‪

17. Water Pump Cover‪

7. Roller Bearing, Small‪

18. Bolt, Pump real estate to Gear situation Cover‪

8. Bearing Race‪

19. Woodruff Key‪

9. Oil Seal‪

20. Small Pipe Plug, Water Pump Housing‪

10. Seal Ring, Water Pump Housing‪

21. Huge Pipe Plug, Water Pump Housing‪

11. Housing, Water Pump‪

22. Drain Cock‪


Figure 2. Front placed Water Pump Details and Relative ar of components

A rectangular rubber ring, located in a groove in the water pump housing, seals the water pump come the gear situation cover. A smaller rectangular rubber ring, situated in a groove in the water pump cover, seals the cover come the water pump housing. Engines built before October, 1989, room equipped through rubber O-ring seals on the water pump housing and also cover. See figure "Front an installed Water Pump Details and Relative ar of components " .‪

An oil seal is located behind the bearing assemblies, and a unitized, spring-loaded, face-type water seal is offered behind the impeller. This seal avoids water from leaking down the shaft and into the gear case. It additionally prevents lubricating oil indigenous entering the cooling system. The water and also oil seals cannot be changed without removed the water pump from the engine.‪

The pump bearings space lubricated by splash oil through a i from the former of the pump housing.‪

Section 4.3.1 Repair or replacement of Water Pump (FM)

To recognize if fix or instead of of the water pump is necessary, do the following procedure. See figure "Flowchart because that Repair or instead of of Water Pump (FM)" .‪


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Figure 3. Flowchart for Repair or instead of of Water Pump (FM)

Section 4.3.2 Draining and also Removal of Front placed Water Pump

Drain the cooling system as follows:‪

Open the drainpipe cocks situated at the best rear corner of the engine, in ~ the bottom the the water pump and in the bottom of the thermostat housing.‪

Remove the water pump together follows:‪

Loosen the hose clamps and remove the coolant hoses native the water pump housing.Loosen and also remove the 3 water pump housing-to-gear situation bolts. Eliminate the water pump indigenous the engine by pulling it straight out the the gear case.Section 4.3.3 Disassembly the Front an installed Water Pump

Disassemble the water pump together follows:‪

Loosen and also remove the two water pump cover-to-pump housing bolts. Remove the water pump sheathe by pulling it straight out that the water pump housing, to prevent possible damage come the seal ring.

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NOTICE:

If a vise is offered to for sure the water pump drive gear for locknut or impeller removal, use soft jaws on the vise and exercise excessive caution to prevent damage to the water pump drive equipment teeth.‪

Clamp the water pump drive gear in a vise, v the impeller dealing with up. Use a two-screw puller and also remove the water pump impeller from the shaft, utilizing the 2 threaded holes in the challenge of the impeller.Use a two-jaw puller to remove the water pump drive equipment from the drive shaft.

Note: Use care not to shed the Woodruff key.

EYE INJURY‪

To avoid injury from paris parts when working with materials under spring tension, wear adequate eye defense (face shield or safety goggles).‪

Support the water pump housing, engine next down, making use of steel blocks or plates; enable at least 76 mm (3 in.) that clearance between the pump housing and the press bed.Press the journey shaft and also bearings assembly out with the back (engine side) of the water pump housing, until both bearing races room clear that the housing.

NOTICE:

Use treatment not to damages the housing. A damaged housing bore will cause coolant leaks and also damage to the engine.‪

Remove both the water and also oil seals from the housing using a brass drift and also hammer.Press the drive pillar out till it is clean of both bearing and race assemblies. Discard the supplied bearings, races and the 2 spacer ring located between the bearing packs.Section 4.3.3.1 investigate of Front placed Water Pump

Inspect the water pump parts as follows:‪

Visually examine the components for cracks, undertake or other damage.If components are no cracked, worn or damaged, reuse staying components.Inspect the water pump real estate for relief slots in the water seal cavity. If the pump is without the relief slots, change the area in i beg your pardon the impeller rides to include the slots. See number "Water Pump Body alteration (FM)" .

Note: The gear situation cover mount water pumps have two actors slots in the water seal cavity. Effective with Engine Serial Number 6R2807 machined relief slot were included to the pump. The relief slots ensure coolant circulation to the seal faces.


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Figure 7. Water Pump Body change (FM)

NOTICE:

If a vise is offered to secure the water pump drive gear for locknut or impeller removal, usage soft jaws top top the vise and also exercise excessive caution come prevent damage to the water pump drive gear teeth.‪

Lock the water pump human body securely in the soft jaws that a bench vise.After machining, wash the pump housing and also all other pump components in clean fuel oil.

EYE INJURY‪

To avoid injury from paris debris when using compressed air, wear adequate eye defense (face shield or security goggles) and also do no exceed 276 kPa (40 psi) air pressure.‪

Dry with compressed air.Section 4.3.4 Cleaning the Front mounted Water Pump

Clean the water pump parts as follows:‪

Wash every one of the pump parts in clean fuel oil.

EYE INJURY‪

To prevent injury from flying debris when using compressed air, wear sufficient eye defense (face shield or safety goggles) and do no exceed 276 kPa (40 psi) air pressure.‪

Dry the components with compressed air.Section 4.3.5 Assembly of Front an installed Water Pump

Assemble the water pump as follows:‪

Coat the bearing bores the the water pump housing and also the drive pillar bearing surfaces through clean engine oil.

NOTICE:

Although the bearings space identical, the bearings and races room matched parts, and should be installed as they are removed from the box. Parts that room not matched will cause damage come the water pump.‪

Remove the shaft and bearing assembly indigenous the press.Section 4.3.5.1 test Bearing Assembly (FM)

Check bearing assembly together follows:‪

Turn bearings to ensure they rotate freely. If bearings bind, disassemble water pump and replace bearing assembly. Refer to "4.3.3 Disassembly the Front an installed Water Pump" . If bearings carry out not bind, reuse the part.‪

Section 4.3.6 Assembly that Water Pump (FM)

Continue assembling the water pump, together follows:‪

Coat the bearings through clean engine oil.Place the water pump housing, confront down (gear side up), on a press bed.Turn the adjustor wheel to raise the expansion until it contact the drive pillar in the water pump housing.Apply Loctite® primer (Locquic inside wall N, part No. 764) by swabbing top top the I.D. The the rotor of the seal.Section 4.3.6.1 Assembly integrity Test

Verify the assembly integrity together follows:‪

Using a 1/2 in.-drive torque wrench in the hole listed in the facility of J–35687 , apply 68 N·m (50 lb·ft) talk in one of two people direction.The gear and impeller have to withstand 68 N·m (50 lb·ft) torque without slipping.Using a dial indicator with a magnetic base, measure the full run-out the the water pump drive equipment at four places, in ~ 90 degree intervals. Best allowable run-out is 0.0635 mm (0.0025 in.). See number "Measuring Water Pump Drive gear Runout (FM)" .

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Figure 28. Measure up Water Pump Drive gear Runout (FM)

If specifications space with limits, reuse part.Section 4.3.7 environment of Front an installed Water Pump

Install the water pump together follows:‪

Coat the two seal rings with clean engine oil. Install the larger seal ring to the groove in the water pump housing. Download the smaller seal ring come the groove in the water pump cover. Coat the water pump drive gear with clean engine oil.Install the water pump to the engine, meshing the water pump drive gear with the bull gear.Install the 3 water pump housing-to-gear case cover bolts. Tighten the bolts alternately and also evenly to draw the water pump straight into the engine. Torque the bolts to 30-38 N·m (22-28 lb·ft).Install the water pump cover to the water pump through two bolts. Torque the bolts alternately and evenly to draw the cover straight into the water pump housing. Speak the bolts come 30-38 N·m (22-28 lb·ft).Slide the coolant hoses into position and tighten the water tap clamps.