Infiniti M35/M45 Y50. Manual — part 346

WATER PUMP

CO-25

[VQ35DE]

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Use the seal cutter [SST: KV10111100 (J37228)] to cut liquid gasket for removal.

8.

Remove timing chain tensioner (primary) as follows:

a.

Remove lower mounting bolt.

CAUTION:

Be careful not to drop mounting bolt inside timing chain
case.

b.

Loosen upper mounting bolt slowly, and then turn chain ten-
sioner (primary) on the mounting bolt so that plunger is fully
expanded.

NOTE:
Even if plunger is fully expanded, it is not dropped from the body
of timing chain tensioner (primary).

c.

Turn crankshaft pulley clockwise so that timing chain on the tim-
ing chain tensioner (primary) side is loose.

d.

Remove upper mounting bolt, and then remove timing chain ten-
sioner (primary).

CAUTION:

Be careful not to drop mounting bolt inside timing chain
case.

9.

Remove water pump as follows:

a.

Remove three water pump mounting bolts. Secure a gap
between water pump gear and timing chain, by turning crank-
shaft pulley counterclockwise until timing chain looseness on
water pump sprocket becomes maximum.

PBIC3575E

PBIC4820E

PBIC3576E

PBIC1193E

CO-26

[VQ35DE]

WATER PUMP

b.

Screw M8 bolts [pitch: 1.25 mm (0.049 in) length: approx. 50
mm (1.97 in)] into water pumps upper and lower mounting bolt
holes until they reach timing chain case. Then, alternately
tighten each bolt for a half turn, and pull out water pump.

CAUTION:

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Pull straight out while preventing vane from contacting
socket in installation area.

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Remove water pump without causing sprocket to contact
timing chain.

c.

Remove M8 bolts and O-rings from water pump.

CAUTION:

Do not disassemble water pump.

INSPECTION AFTER REMOVAL

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Check for badly rusted or corroded water pump body assembly.

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Check for rough operation due to excessive end play.

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If anything is found, replace water pump.

INSTALLATION

1.

Install new O-rings to water pump.

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Apply engine oil and engine coolant to O-rings as shown in
the figure.

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Locate O-ring with white paint mark to engine front side.

2.

Install water pump.

CAUTION:

Do not allow cylinder block to nip O-rings when installing
water pump.

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Make sure timing chain and water pump sprocket are
engaged.

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Insert water pump by tightening mounting bolts alternately
and evenly.

3.

Install timing chain tensioner (primary) as follows:

JLC357B

SLC943A

PBIC1397E

PBIC1058E

WATER PUMP

CO-27

[VQ35DE]

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a.

Turn crankshaft pulley clockwise so that timing chain on the tim-
ing chain tensioner (primary) side is loose.

b.

Pull plunger stopper tab up (or turn lever downward) so as to
remove plunger stopper tab from the ratchet of plunger.

NOTE:
Plunger stopper tab and lever are synchronized.

c.

Push plunger into the inside of tensioner body.

d.

Hold plunger in the fully compressed position by engaging
plunger stopper tab with the tip of ratchet.

e.

To secure lever, insert stopper pin through hole of lever into ten-
sioner body hole.

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The lever parts and the tab are synchronized. Therefore, the
plunger will be secured under this condition.

NOTE:
Figure shows the example of 1.2 mm (0.047 in) diameter thin screwdriver being used as the stopper pin.

f.

Install timing chain tensioner (primary).

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Remove dust and foreign material completely from backside of timing chain tensioner (primary) and
from installation area of rear timing chain case.

g.

Remove stopper pin.

h.

Make sure again that timing chain and water pump sprocket are engaged.

4.

Install chain tensioner cover and water pump cover as follows:

a.

Before installing, remove all traces of old liquid gasket from mat-
ing surface of water pump cover and chain tensioner cover
using scraper. Also remove traces of old liquid gasket from the
mating surface of front timing chain case.

PBIC1805E

PBIC3568E

PBIC3577E

SLC446B

CO-28

[VQ35DE]

WATER PUMP

b.

Apply a continuous bead of liquid gasket with tube presser
(commercial service tool) to mating surface of chain tensioner
cover and water pump cover.
Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-47, "RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS"

.

CAUTION:

Attaching should be done within 5 minutes after coating.

c.

Tighten mounting bolts.

5.

Install water drain plug (front) on water pump side of cylinder block.

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Apply liquid gasket to the thread of water drain plug (front).
Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-47, "RECOMMENDED CHEMICAL

PRODUCTS AND SEALANTS"

.

6.

Install in the reverse order of removal for remaining parts.

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After starting engine, let idle for three minutes, then rev engine up to 3,000 rpm under no load to
purge air from the high-pressure chamber of chain tensioner. Engine may produce a rattling
noise. This indicates that air still remains in the chamber and is not a matter of concern.

INSPECTION AFTER INSTALLATION

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Check for leaks of engine coolant using the radiator cap tester adapter (commercial service tool) and the
radiator cap tester (commercial service tool). Refer to

CO-11, "LEAK CHECK"

.

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Start and warm up the engine. Visually make sure that there is no leaks of engine coolant.

PBIC2663E