Yamaha YZF-R125 Service Manual: Assembling the water pump

Yamaha YZF-R125 Service Manual / Cooling system / Water pump / Assembling the water pump

1. Install:

Water pump seal "1"
(into the water pump housing "2")

CAUTION:

Never lubricate the water pump seal surface with oil or grease.

NOTE:

Install the water pump seal with the special tools.
Install the water pump seal with the special tools to the specified depth as shown in the illustration.

Assembling the water pump

A. Push down

3. Mechanical seal installer

4. Middle driven shaft bearing driver

Assembling the water pump

a. 0-0.5 mm (0-0.02 in)

2. Lubricate:

Water pump seal lip

3. Install:

Water pump housing gasket "1"

Water pump housing plate "2"
Impeller shaft
Impeller shaft retainer "3"

NOTE:

Before installing the impeller shaft retainer, lubricate the slit on the impeller shaft end with a thin coat of lithium-soap-based grease.
Install the water pump housing gasket, water pump housing plate, and impeller shaft retainer as shown in the illustration.
After installation, check that the impeller shaft rotates smoothly.

Assembling the water pump

Checking the water pump

1. Check: Water pump housing cover Water pump housing Cracks/damage Replace. Impeller shaft Cracks/damage/wear Replace. Bearing Rough movement Replace. Radiator outlet hose Crac ...

Installing the water pump

1. Install: Water pump assembly "1" O-rings "2" NOTE: Align the projection "a" on the impeller shaft with the slit "b" on the camshaft sprocket bolt. Lubricate the O-rings with a thi ...

Other materials:

Checking the camshaft
1. Check: Camshaft lobes Blue discoloration/pitting/scratches Replace the camshaft. 2. Measure: Camshaft lobe dimensions "a" and "b" Out of specification Replace the camshaft. 3. Check: Camshaft oil passage Obstruction Blow out with compressed air. ...

Changing the engine oil
1. Remove: Right bottom cowling Right upper side cowling Right lower side cowling Refer to "GENERAL CHASSIS" on page 4-1. 2. Start the engine, warm it up for several minutes, and then turn it off. 3. Place a container under the engine oil drain bolt. 4. Install: Engine oil d ...

Checking the camshaft sprocket and timing chain guide
1. Check: Camshaft sprocket More than 1/4 tooth wear "a" Replace the camshaft sprocket, timing chain and crankshaft as a set. a. 1/4 tooth b. Correct 1. Timing chain roller 2. Camshaft sprocket 2. Check: Timing chain guide (exhaust side) Damage/wear Replace. ...