Mitsubishi S12A2, Service Manual

Page: 272 / 354

10-30
Chapter 10 COOLING SYSTEM
2.9 Water pump - Inspect
Measure the bearing fit diameters of water pump bearing housing and shaft, and the inside and outside diameters of bearing.If
any of the measurements is out of the standard, replace the part with a new one.
Item Nominal value Standard value
Inside diameter of case bearing housing
ø62 mm [2.44 in.] 61.988 to 62.018 mm [2.4404 to 2.4416 in.]
ø72 mm [2.83 in.] 71.988 to 72.018 mm [2.8341 to 2.8353 in.]
Bearing
Large
Outside diameter ø72 mm [2.83 in.] 71.987 to 72.000 mm [2.8341 to 2.8346 in.]
Inside diameter ø30 mm [1.18 in.] 29.988 to 30.000 mm [1.1806 to 1.1811 in.]
Small
Outside diameter ø62 mm [2.44 in.] 61.987 to 62.000 mm [2.4404 to 2.4409 in.]
Inside diameter ø30 mm [1.18 in.] 29.988 to 30.000 mm [1.1806 to 1.1811 in.]
Outside diameter of shaft fit to bearing ø30 mm [1.18 in.] 30.002 to 30.011 mm [1.1812 to 1.1815 in.]
Impeller front clearance 0.6 to 1.4 mm [0.0236 to 0.0551 in.]
Impeller back clearance 1.0 mm [0.040 in.]