■ CAUTION ■

- When removing water pump assembly, be careful not to get engine coolant on drive belt.
- Water pump cannot be disassembled and should be replaced as a unit.
- After installing water pump, connect hose and clamp securely, then check for leakage using the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool).

REMOVAL

1.Remove engine assembly from the vehicle. Refer to Exploded View (GT-R certified NISSAN dealer).

2.Remove front timing chain case. Refer to Exploded View (GT-R certified NISSAN dealer).

3.Remove timing chain tensioner (primary) as follows:

(1)Remove lower mounting bolt (A).

(2)Loosen upper mounting bolt (B) slowly, and then turn timing chain tensioner (primary) (1) on the upper mounting bolt so that plunger (C) is fully expanded.
NOTE：
Even if plunger is fully expanded, it is not dropped from the body of timing chain tensioner (primary).

(3)Remove upper mounting bolt, and then remove timing chain tensioner (primary).

4.Remove water pump as follows:

(1)Remove three water pump mounting bolts. Secure a gap between water pump gear and timing chain, by turning crankshaft counterclockwise until timing chain looseness on water pump sprocket becomes maximum.

(2)Screw M8 bolts (A) [pitch: 1.25 mm (0.0492 in) length: approximately 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 (1).
■ CAUTION ■

- Pull straight out while preventing vane from contacting socket in installation area.
- Remove water pump without causing sprocket to contact timing chain.

(3)Remove M8 bolts and O-rings from water pump.
■ CAUTION ■
Never disassemble water pump.

INSTALLATION
■ CAUTION ■
Replace water hose clamp if it is removed.

1.Install new O-rings to water pump.

- Apply engine oil to O‐ring (1) and engine coolant to O-ring (3) as shown in the figure.

  2 | : Water pump

- Locate O-ring with yellow paint mark (A) to front side.
- Locate O-ring with light blue paint mark (B) to rear side.

2. Install water pump.
■ CAUTION ■
Never allow cylinder block to nip O-rings when installing water pump.

- Check timing chain and water pump sprocket are engaged.
- Insert water pump by tightening mounting bolts alternately and evenly.

3.Install timing chain tensioner (primary) as follows:

(1)Turn crankshaft clockwise so that timing chain on the timing chain tensioner (primary) side is loose.

(2)Pull plunger stopper tab (A) up (or turn lever downward) so as to remove plunger stopper tab from the ratchet of plunger (D).
NOTE：
Plunger stopper tab and lever (C) are synchronized.

(3)Push plunger into the inside of tensioner body.

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

(5)To secure lever, insert stopper pin (E) through hole of lever into tensioner body hole (B).

- 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.

(6)Install timing chain tensioner (primary).

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

(7)Remove stopper pin.

(8)Check again that timing chain and water pump sprocket are engaged.

4.Install in the reverse order of removal for remaining parts.

- 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.