1987 MAZDA 626 oil pressure

2 A TROUBLESHOOTING GUIDE
SPECIFICATIONS
Engine model Item . FEDOHC F6, F8, FE SOHC
Lubrication system Force-fed
Oil pump
Type Trochoid gear Crescent gear
Oil pump Regulated pressure kPa (kg/cm2, psi) 490 (5.0, 71) 392 (4.0, 57) Oil pump
Oil pressure kPa (kg/cm2, psi)
1,000 rpm 147-245 (1.5-2.5, 21-36) Oil pump
Oil pressure kPa (kg/cm2, psi) 3,000 rpm 343—441 (3.5-4.5, 50-64) 294-392 (3.0-4.0, 43—57)
Oil filter Type Full-flow, paper element Oil filter Relief pressure differential kPa (kg/cm2, psi) 98 (1.0, 14)
Oil cooler Type Water cooled, 6-layer Water cooled, 4-layer
Oil warning pressure kPa (kg/cm2, psi) 29 (0.3, 4.3)
Oil capacity
Total (dry engine) liters (US qt, Imp qt) 4.3 (4.5, 3.8)
Oil capacity Oil pan liters (US qt, Imp qt) 3.6 (3.8, 3.2) Oil capacity
Oil filter liters (US qt, Imp qt) 0.2 (0.21, 0.18) 0.3 (0.32, 0.26)
Engine oil (API service) SD, SE, or SF
76G02A-003
Recommended SAE Viscosity
Temperature j0pj
-30 -20 -10 0 10 20 30 40 50 I l I I 1 < ! I I Temperature j0pj i i i i I i 1 1
-20 0 20 40 60 80 100 120
Engine oil Engine oil
5W-30 X 30 >
Engine oil Engine oil
5W-20 > < 20W-20 > < 40
Engine oil < 10W-30 > Engine oil
< 10W-40 10W-50
Engine oil Engine oil
< 20W-40 20W-50
Engine oil
Temperature range anticipated before next oil change, °C(°F)
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Engine hard
starting
Improper engine oil
Insufficient engine oil
Replace
Add oil
2A— 5
2A— 5
Excessive oil con-
sumption
Oil working up or working down
Oil leakage
Refer to Section 1
Repair
Oil pressure drop Insufficient oil
Oil leakage
Worn or damaged oil pump gear
Worn plunger (inside oil pump) or weak spring
Clogged oil strainer
Excessive main bearing or connecting rod bearing
clearance
Add oil
Repair
Replace
Replace
Clean
Refer to Section 1
2A- 5
2A-11
2A-11
Warning lamp illu-
minated while en-
gine running
Oil pressure drop
Malfunction of oil pressure switch
Malfunction of electrical system
As described above
Refer to Section 15
Refer to Section 15
76G02A-004
2A—4

INSPECTION, ENGINE OIL 2A
86U02X-004
INSPECTION
ENGINE OIL
1. Be sure the vehicle is on level ground.
2. Warm up the engine to normal operating temper-
ature and stop it.
3. Wait for five minutes.
4. Remove the oil level gauge and check the oil lev-
el and condition.
5. Add or replace oil if necessary.
Note
The distance between the L and F marks on
the level gauge represents 1.0 liter (1.06 US
qt, 0.88 Imp qt).
OIL PRESSURE
1. Remove the oil pressure switch.
69G02A-006
76G02A-005
86U02X-006
2. Screw the SST into the pressure switch installa-
tion hole.
3. Warm up the engine to normal operating tem-
perature.
4. Run the engine at 3,000 rpm, and note the gauge
reading.
Oil pressure:
343—441 kPa
(3.5—4.5 kg/cm2, 50—64 psi)...DOHC 2g4 392 kPa
(3.0—4.0 kg/cm2, 43—57 psi)...SOHC
5. If the pressure is not as specified, check for the
cause, and repair if necessary.
(Refer to Troubleshooting Guide.)
ENGINE OIL
REPLACEMENT
1. Warm up the engine to the normal operating tem-
perature and stop it.
2. Remove the oil filler cap and the oil pan drain plug.
3. Drain the oil into a suitable container.
Warning
Be careful when draining, the oil is very hot.
2A-5

OIL PUMP 2A
DISASSEMBLY
Disassemble in the sequence shown in the figure. 69G02B-012
1. Pump cover
2. Outer gear
3. Inner gear
4. Pressure relief
valve
5. Oil seal
6. Oil pump body
76G02A-018
INSPECTION
(DOHC)
1. Check the following and replace any faulty parts.
(1) Distorted or damaged oil pump body or cover
(2) Worn or damaged plunger
(3) Weak or broken plunger spring
2. Measure the side clearance.
Clearance: 0.10 mm (0.004 in) max.
76G02A-019
3. Measure the tooth tip clearance.
Clearance: 0.18 mm (0.007 in) max.
69G02B-015
2A-11

OIL PUMP 2 A
76G02A-023
86U02X-022
76G02A-024
5. Measure the outer gear to pump body clearance.
Clearance: 0.20 mm (0.008 in) max.
ASSEMBLY
Assemble the pump as follows.
Oil Seal
1. Apply engine oil to the pump body and the out-
side of the new oil seal.
2. Press in the oil seal.
Pressure Relief Valve
1. Install the plunger and spring in the pump body.
2. Fit the snap ring.
Outer and Inner Gear
Install the gears to the pump body.
Oil Pump Cover
1. Apply thread locking compound to the cover
mounting screws' threads.
2. Attach the oil pump cover to the body.
Tightening torque:
6—9 N-m (60—90 cm-kg, 52—78 in-lb)
INSTALLATION
Install in the reverse order of removal referring to the
installation note.
Installation Note
Oil pump
1. Apply grease to a new O-ring and install it in the
oil pump body.
2. Apply silicon sealant to the shaded area as shown
in the figure.
3. Apply engine oil to the oil seal lip.
76G02A-027
2A-13

2B
LUBRICATION SYSTEM
(DIESEL)
OUTLINE 2B— 2
LUBRICATION CIRCUIT 2B— 2
SPECIFICATIONS 2B— 3
TROUBLESHOOTING GUIDE 2B— 4
INSPECTION 2B— 5
ENGINE OIL 2B— 5
OIL PRESSURE 2B— 5
ENGINE OIL 2B— 6
REPLACEMENT 2B— 6
OIL FILTER 2B— 6
REPLACEMENT 2B— 6
OIL COOLER AND OIL FILTER BODY 2B— 7
REMOVAL 2B— 7
INSPECTION 2B— 7
INSTALLATION 2B— 8
OIL PAN 2B— 9
REMOVAL 2B— 9
INSPECTION 2B—10
INSTALLATION 2B—10
OIL PUMP 2B—12
REMOVAL 2B—12
DISASSEMBLY 2B—13
INSPECTION 2B—13
ASSEMBLY 2B—14
INSTALLATION 2B—14
OIL JET 2B—15
REMOVAL 2B—15
INSPECTION 2B—15
INSTALLATION 2B—15
76G02B-001

OUTLINE 2B
SPECIFICATIONS
Item Engine model RF-CX RF-N

Lubrication system Force-fed
Type Trochoid gear
Oil pump Gear width mm (in) 7 (0.28)
Regulated pressure kPa (kg/cm2,
psi)
510-618 (5.2 -6.3, 74—90)
Oil filter
Type Combined, paper element
Oil filter
Relief pressure differential kP (kg/cm2,
psi)
78-118 (0.8--1.2, 11-17)
Oil cooler Type Water cooled, 10 layer Water coold,
4
layer
Oil filter body
Regulated pressure kPa (kg/cm2,
psi)
402—481
(4.1
-4.9, 58—70)
Oil filter body
Oil cooler relief pressure differential kPa (kg/cm2, psi) 177-216 (1.8 -2.2, 26-31)
Oil warning lamp activation pressure kPa (kg/cm2,
psi)
29 (0.3, 4.3)
Oil capacity
Total (dry engine)
Oil pan
Oil filter
liters (US qt, Imp
qt)

liters (US qt, Imp
qt)

liters (US qt, Imp
qt)

6.1 (6.4, 5.4)
5.0 (5.3, 4.4)
0.5 (0.52, 0.44)
Engine oil type API service CD CC,
CD
76G02B-003
Recommended SAE Viscosity
CC) Temperature
—30 —20 —10 0 10 20 30 40 50 i i i i i i i ii CC) Temperature i i II i i i i —20 0 20 40 60 80 100 120
Engine oil
5W-30 >
Engine oil
< 10W-30 >
< 20W-20 >
< 15W-40 >
Engine oil
Engine oil
Temperature range anticipated before next oil change, °C(°F)
76G02B-004
2B-3

2B TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Engine hard
starting

Improper engine
oil

Insufficient engine
oil

Replace
Add
oil

2B—
6

2B—
5
Excessive oil
consumption

Oil working
up or
working down
Oil leakage
Refer
to
Section
1C

As described below

Oil leakage
Loose drain plug
or
damaged washer
Faulty seal
at oil
pan and cylinder block
Damaged cylinder head cover and
its
seal
Loose
oil
pump body bolt, cylinder head cover bolt,
or

oil pan bolt
Damaged front housing gasket,
or
cylinder head gasket
Faulty
oil
seal(s)
Loose
oil
filter
Loose
or
damaged
oil
pressure switch
Tighten
or
replace
Repair
Replace
Tighten
Replace
Replace
Tighten
Tighten
or
replace
2B—10
2B—10
2B-
6
Oil pressure drop
Oil leakage
Insufficient
oil

Worn and/or damaged
oil
pump gear
Worn plunger (inside
oil
pump)
or
weak spring
Clogged
oil
strainer
Excessive
oil
clearance between main bearing
or
con-
necting
rod
bearing
As described above
Add
oil

Replace
Replace
Clean
Refer
to
Section
1C

2B-
5

2B—13
2B—14

Warning lamp il-
luminates while
engine running

Oil pressure drop
Malfunction
of oil
pressure switch
Malfunction
of
electrical system
As described above
Refer
to
Section
15

Refer
to
Section
15
76G02B-005
2B—4

INSPECTION 2B
A
76G02B-006
INSPECTION
ENGINE OIL
1. Be sure the vehicle is on level ground.
2. Warm up the engine to normal operating temper-
ature and stop it.
3. Wait for five minutes.
4. Remove the oil level gauge and check the oil lev-
el and condition.
5. Add or replace oil if necessary.
Note
The distance between the L and F marks on
the level gauge represents 1.2 liters (1.26 US
qt, 1.05 Imp qt).
OIL PRESSURE
1. Disconnect the oil hose (vacuum pump—cylinder
block).
76G02B-007
2. Set the SST as shown.
3. Remove the vacuum pump drive belt to prevent
heat damage to bearing.
4. Warm up the engine to normal operating tem-
perature.
76G02B-008
5. Run the engine first at 1,000 rpm, then at 3,000
rpm and note the gauge reading.
Standard oil pressure kPa (kg/cm2, psi)

1,000 rpm 147-245 (1.5-2.5, 21-36)
3,000
rpm
343—441 (3.5-4.5, 50—64)

6. If the pressure is not as specified, check for the
cause, and repair if necessary.
(Refer to Troubleshooting Guide.)
76G02B-009
2B—5