Subaru Legacy (2005 year). Manual - part 303

LU(H4DOTC)-11

LUBRICATION

Oil Pump

14) Remove the oil pump by using flat tip screw-
driver.

CAUTION:
Be careful not to scratch mating surfaces of 
cylinder block and oil pump.

B: INSTALLATION

Install in the reverse order of removal.
Perform the following.
1) Apply liquid gasket to the mating surfaces of oil
pump.

Liquid gasket:

THREE BOND 1215 (Part No. 004403007) or 
equivalent

2) Replace the O-ring (A) with a new one.
3) Apply a coat of engine oil to the inside of oil seal.

4) Position the oil pump, aligning the notched area
with the crankshaft, and push the oil pump straight.

CAUTION:
• Make sure the oil seal lip is not folded.
• Be careful not to scratch the oil seal when in-
stalling oil pump on cylinder block.

5) Install the oil pump.
6) Apply liquid gasket to the three bolts thread. (if to
be reused)

Liquid gasket:

THREE BOND 1215 (Part No. 004403007) or 
equivalent

Tightening torque:

6.4 N

⋅

m (0.65 kgf-m, 4.7 ft-lb)

LU-00016

LU-00017

( A )

ME-00312

LU-02103

T

LU(H4DOTC)-12

LUBRICATION

Oil Pump

C: DISASSEMBLY

Remove the screw which secures oil pump cover
and then disassemble oil pump. Inscribe alignment
marks on the inner and outer rotors so that they can
be replaced in their original positions during reas-
sembly.

CAUTION:
Before disassembling the oil pump, remove the 
relief valve.

D: ASSEMBLY

1) Install the front oil seal using ST.
ST

499587100

OIL SEAL INSTALLER

NOTE:
Use a new oil seal.

2) Apply a coat of engine oil to inner and outer ro-
tors.
3) Install the inner and outer rotors in their original
positions.
4) Install the oil relief valve and install relief valve
spring and plug.

NOTE:
Use a new gasket.
5) Install the oil pump cover.

Tightening torque:

T1: 5.4 N

⋅

m (0.55 kgf-m, 4.0 ft-lb)

T2: 44 N

⋅

m (4.5 kgf-m, 33 ft-lb)

(A) Oil seal

(B) Pump case

(C) Inner rotor

(D) Outer rotor

(E) Pump cover

(F) Relief valve

(G) Relief valve spring

(H) Plug

(I) Gasket

LU-00020

(E)

(D)

(C)

(B)

(A)

(F)

(G)

(I)

(H)

LU-00021

ST

LU-00022

T1

T2

LU(H4DOTC)-13

LUBRICATION

Oil Pump

E: INSPECTION

1. TIP CLEARANCE

Measure the tip clearance of rotors. If the clearance
is out of the specification, replace rotors as a
matched set.

Tip clearance:

Specification

0.04 — 0.14 mm (0.0016 — 0.0055 in)

2. CASE CLEARANCE

Measure the clearance between outer rotor and oil
pump rotor housing. If the clearance is out of the
specification, replace the oil pump case.

Case clearance:

Specification

0.10 — 0.175 mm (0.0039 — 0.0069 in)

3. SIDE CLEARANCE

Measure the clearance between oil pump inner ro-
tor and pump cover. If the clearance exceeds the
specification, replace the rotor or pump body.

Side clearance:

Specification

0.02 — 0.07 mm (0.0008 — 0.0028 in)

4. OIL RELIEF VALVE

Check the valve for fitting condition and damage,
and the relief valve spring for damage and deterio-
ration. Replace the parts if defective.

Relief valve spring:

Free length

73.7 mm (2.902 in)

Installed length

54.7 mm (2.154 in)

Load when installed

93.1 N (9.49 kgf, 20.88 lbf)

5. OIL PUMP CASE

Check the oil pump case for worn shaft hole,
clogged oil passage, worn rotor chamber, cracks
and other faults.

6. OIL SEAL

Check the oil seal lips for deformation, hardening,
wear, etc., and replace if defective.

LU-00023

LU-00024

LU-00025

LU(H4DOTC)-14

LUBRICATION

Oil Pan and Strainer

5. Oil Pan and Strainer

A: REMOVAL

1) Set the vehicle on a lift.
2) Remove the front wheels.
3) Remove the collector cover.
4) Disconnect the ground cable from battery.

5) Disconnect the connector from mass airflow
sensor.
6) Remove the air intake boot and air cleaner upper
cover.

7) Remove the intercooler.
<Ref. to IN(H4DOTC)-12, REMOVAL, Intercool-
er.>
8) Remove the pitching stopper.

9) Remove the linear motion mounting.
<Ref. to ME(H4DOTC)-38, REMOVAL, Linear Mo-
tion Mounting.>

10) Remove the radiator upper brackets.

11) Support the engine with a lifting device and
wire ropes.

12) Lift-up the vehicle.

CAUTION:
When lifting up the vehicle, raise up wire ropes 
at the same time.
13) Remove the under cover.
14) Drain the engine oil.
15) Remove the front exhaust pipe.
<Ref. to EX(H4DOTC)-5, REMOVAL, Front Ex-
haust Pipe.>
16) Remove the nuts which install front cushion
rubber onto front crossmember.

17) Remove the bolts which install oil pan on cylin-
der block with the engine raised up.
18) Insert the oil pan cutter blade into the gap be-
tween cylinder block and oil pan.

CAUTION:
Do not use a screwdriver or similar tool in place 
of oil pan cutter.
19) Remove the oil strainer.

IN-00203

LU-00220

LU-00221

CO-00040

LU-00222

LU-02023