Mitsubishi 4DQ3 Service Manual page 36

2- 2 Inspectio n
( 1) Running clearance between outer rotor and inner
rotor
Using a thickness gauge, check the clearance at
various positions. If the reading exceeds the service
limit; replace both rotors.
Specifications
Item
Clearance between
inner rotor and
(0.00051- 0.005 9) (0.0098)
outer rotor
(2) Sliding clearance between rotors and cover
This clearance is required to be not greater than
0.15 mm (0.00591 in.). If this limit is exceeded,
grind off the mating face of the body to reduce
the clearance.
Specifications
Item
Clearance between
(0.0016-0.0035)
rotors and cover
(3) Radial clearance between outer rotor and pump
body
Insert a thickness gauge into between outer rotor
and body, If the clearance checked is greater than
the limit, replace the worn part.
Specifications
Item
Clearance of outer
(0.0079 -0.01083
rotor in body
(4) Rotor shaft diameter
Inspect the shaft for damage, and check it for
wear by miking. Determine the available clearance
of the shaft in the pump body from the mike
readings; if the service limit in terms of clearance
value is exceeded or if the shaft is in badly dam­
aged condition, replacement is necessary.
Specifications
Item
Rotor
shaft
(0.5118 J.ooos9 )
diameter
Shaft to
body
(0.00126 - 0.00291)
clearance
Unit: mm (in.)
Service
Standard
limit
0.013-0.15 0.25
Unit: mm (in.)
Repair
Standard
limit
OJM.-0.09 0.15
(0.0059 )
Unit: mm (in.)
Repair
Standard
limit
0.2- 0.275 0.50
(0.020)
Unit: mm (in.)
Service
Standard
limit
0
13 --0.015
0.15
0.032 - 0.074
(0.0059)
Checking rotor-to-rotor clearance
Checking rotor-to-cover clearance
Checking rotor-to-body clearance