1987 MAZDA 626 Workshop Manual

TECHNICAL DATA 30
1C. ENGINE (DIESEL)
— _____ Engine model Item . RF-CX RF-N

Type Diesel, 4-cycle
Cylinder arrangement and number In-line, 4-cylinders
Type
of
combustion chamber Swirl chamber
Valve system OHC, belt-driven
Bore
x
Stroke
mm (in)
86.0
x
86.0 (3.39
x
3.39)
Total piston displacement
cc
(cu
in)
1,998 (121.9)
Compression ratio 21.1
: 1 |
22.7
: 1

Compression pressure
kPa (kg/cm2, psi)-rpm
Standard 2,943 (30, 427)-200
Compression pressure
kPa (kg/cm2, psi)-rpm Minimum 2,649 (27, 384)-200 Compression pressure
kPa (kg/cm2, psi)-rpm Maximum difference
between cylinders 294 (3.0,
43)

Valve timing
IN Open BTDC 13° 13°
Valve timing
IN Close ABDC 15° 39° Valve timing
EX Open BBDC 60° 60° Valve timing
EX Close ATDC 8° 8°
Valve clearance
mm
(in) IN Cold: 0.25 (0.010), Warm: 0.30 (0.012) Valve clearance
mm
(in) EX Cold: 0.35 (0.014), Warm: 0.40 (0.016)

Cylinder head

Height mm (in) 133.9-134.1 (5.272-5.280)
Distortion mm (in) 0.10 (0.004) max.
Length
of
cylinder head bolt beiow head
mm
(in)
Standard 113.2—113.8 (4.457—4.480) Length
of
cylinder head bolt beiow head
mm
(in) Maximum 114.5 (4.508)

Combustion chamber insert

Recession
mm
(in) 0.020 (0.0008)
Projection
mm
(in) 0.005 (0.0001)

Valve and valve guide

Valve head diameter
mm
(in) IN 39.3-39.5 (1.547—1.555) 40.9-41.1 (1.610—1.618) Valve head diameter
mm
(in) EX 35.0-35.2 (1.378-1.386) 35.9-36.1 (1.413—1.421)
Valve head thickness (margin)
mm
(in) IN 1.80 (0.071) 0.80 (0.031) Valve head thickness (margin)
mm
(in) EX 1.65 (0.065) 0.80 (0.031)
Valve face angle IN 60° 45° Valve face angle EX 45°
Valve length mm (in) IN 106.9(4.209) Valve length mm (in) EX 106.8 (4.205)
Valve stem diameter
mm
(in) IN 7.970-7.985 (0.3138—0.3144) Valve stem diameter
mm
(in) EX 7.965-7.980 (0.3136-0.3142)
Guide inner diameter mm (in) IN 8.025-8.045 (0.3159—0.3167) Guide inner diameter mm (in) EX 8.025-8.045 (0.3159—0.3167)
Valve stem
to
guide clearance
mm (in)

IN 0.040-0.075 (0.0016-0.0030)
Valve stem
to
guide clearance
mm (in)
EX 0.045—0.080 (0.0018-0.0031) Valve stem
to
guide clearance
mm (in)

Maximum 0.1 (0.004)
Guide projection (Height "A")
mm
(in) 8.3-8.8 (0.327-0.346)

Valve seat

Seat angle IN 60° 45° Seat angle EX 45°
Seat contact width
mm
(in) IN 1.4-1.8 (0.055—0.071) 1.7-2.3 (0.067-0.091) Seat contact width
mm
(in) EX 1.64-2.04 (0.065-0.080) 1.7-2.3 (0.067-0.091)
Seat sinking (Measure valve recession)
mm
(in)
IN Standard 0.75-1.05 (0.030-0.041)
Seat sinking (Measure valve recession)
mm
(in)
IN Maximum 2.55 (0.100) Seat sinking (Measure valve recession)
mm
(in) EX Standard 0.75—1.05 (0.030-0.041) Seat sinking (Measure valve recession)
mm
(in) EX Maximum 2.55 (0.100)

Valve spring

Free length
mm
(in) Standard 45.11 (1.776) Free length
mm
(in) Minimum 44.8 (1.764)

30-11

30 TECHNICAL DATA
—— Engine model Item RF-CX RF-N

0..t cy sui.aro
mm
(in) 1.6 (0.063)/2° max.
Setting load/height
N
(kg. Ib)/mm (in) 275 (28.0, 62)/39.0 (1.535)

Tappet

Tappet outer diameter
mm
(in) 34.95-34.97 (1.3764-1.3768)
Tappet hole diameter
mm
(in) 34.99-35.01 (1.3776-1.3787)
Tappet
to
tappet hole
,. ,
clearance
mm (in)

Standard 0.02-0.06 (0.0008-0.0024) Tappet
to
tappet hole
,. ,
clearance
mm (in)
Maximum 0.10 (0.004)

Camshaft and camshaft caps

Cam lobe height
mm (in)

IN Standard 42.521 (1.6741) 44.306 (1.7443)
Cam lobe height
mm (in)

IN Minimum 42.11 (1.658) 43.90 (1.728) Cam lobe height
mm (in)

EX Standard 45.300 (1.7835) Cam lobe height
mm (in)

EX Minimum 44.90 (1.768)
Journal diameter
mm (in)
Standard 31.959-31.975 (1.2582-1.2589) Journal diameter
mm (in)
Out-of-round 0.05 (0.0020) max.
Camshaft bearing
oil
clearance
mm (in)
Standard 0.025—0.066 (0.0010-0.0026) Camshaft bearing
oil
clearance
mm (in) Maximum 0.10 (0.004)
Camshaft run-out (deflection)
mm
(in) 0.10 (0.004) max.
Camshaft end play
mm (in)
Standard 0.02-0.15 (0.0008-0.0059) Camshaft end play
mm (in)
Maximum 0.20 (0.008)

Cylinder block

Height
mm (in)
301.5 (11.87)
Distortion
mm (in)
0.10 (0.004) max.
Cylinder bore diameter
mm (in)
Standard size 86.000-86.022 (3.3858-3.3867) Cylinder bore diameter
mm (in) 0.25 (0.010) oversize 86.250-86.272 (3.3957-3.3965) Cylinder bore diameter
mm (in) 0.50 (0.020) oversize 86.500-86.522 (3.4055-3.4064)
Cylinder bore taper and out-of-round
mm
(in) 0.022 (0.0009) max.

Piston

Piston diameter (Measured at 90°
to pin
bore axis and
19
mm (0.75
in)
above the bottom
of
pis-ton) mm (in)
Standard size 85.957—85.983 (3.3841—3.3852) Piston diameter (Measured at 90°
to pin
bore axis and
19
mm (0.75
in)
above the bottom
of
pis-ton) mm (in)
0.25 (0.010) oversize 86.207-86.233 (3.3940-3.3950)
Piston diameter (Measured at 90°
to pin
bore axis and
19
mm (0.75
in)
above the bottom
of
pis-ton) mm (in) 0.50 (0.020) oversize 86.457-86.483 (3.4038-3.4048)
Piston and cylinder clearance
mm
(in) Standard 0.032-0.050 (0.0013-0.0020) Piston and cylinder clearance
mm
(in) Maximum 0.15 (0.0059)

Piston ring

Thickness
mm
(in)
TOD
1.97-1.99 (0.0776-0.0783) Thickness
mm
(in) Second 1.97-1.99 (0.0776—0.0783)
End gap (measured
in
the cylinder)
mm (in)

TOD
0.20-0.35 (0.008-0.014) 0.20-0.40 (0.008-0.016)
End gap (measured
in
the cylinder)
mm (in)
Second 0.20-0.35 (0.008-0.014) 0.20-0.40 (0.008-0.016) End gap (measured
in
the cylinder)
mm (in) Oil (rail) 0.20-0.40 (0.008-0.016)
End gap (measured
in
the cylinder)
mm (in)
Maximum 1.0 (0.039)
Ring groove width
in
piston
mm
(in)

TOD
2.17-2.19 (0.0854-0.0862) 2.04-2.06 (0.0803-0.0811)
Ring groove width
in
piston
mm
(in) Second 2.03-2.05 (0.0799—0.0807) Ring groove width
in
piston
mm
(in)
Oil 4.02-4.04 (0.1583-0.1591)
Clearance
of
piston ring
to
ring groove
mm (in)

TOD
0.18-0.22 (0.0071-0.0087) 0.05—0.09 (0.0020-0.0035) Clearance
of
piston ring
to
ring groove
mm (in) Second 0.04-0.08 (0.0016-0.0031) Clearance
of
piston ring
to
ring groove
mm (in) Maximum 0.2 (0.008)

Piston pin

Piston pin hole diameter
(in
piston) 29.997-30.007 (1.1810-1.1814) 24.997-25.007 (0.9841-0.9845)
Diameter
mm
fin) 29.994-30.000 (1.1809-1.1811) 24.994-25.000 (0.9840-0.9843)
Clearance
in
connecting rod bushing
mm
(in) 0.05 (0.002) max.

30—12

TECHNICAL DATA 30
Item Engine model RF-CX RF-N
Connecting rod and connecting rod bearing

Length (Center
to
center) mm (in) 151.95-152.05 (5.9823—5.9862)
Maximum twisting and bending mm (in) 0.080 (0.0031)
per 50
(1.969)
Small end bushing inner diameter mm (in) 30.014-30.030 (1.1817-1.1823) 25.014-25.030 (0.9848-0.9854)
Big end bore mm (in) 54.002-54.017 (2.1261-2.1266)
Big end width mm (in) 25.900—26.100 (1.0197—1.0276)
Connecting rod side clearance mm (in) Standard 0.11-0.262 (0.0043-0.0103) Connecting rod side clearance mm (in) Maximum 0.30 (0.012)

Crankshaft

Crankshaft runout mm (in) 0.05 (0.002) max.
Standard Standard 59.937-59.955 (2.3597-2.3604)
size Minimum 59.89 (2.358)
0.25 (0.010) Standard 59.687-59.705 (2.3499-2.3506)
Main journal diameter undersize Minimum 59.64 (2.348) mm (in) 0.50 (0.020) Standard 59.437-59.455 (2.3400-2.3407)
undersize Minimum 59.39 (2.338)
0.75 (0.030) Standard 59.187-59.205 (2.3302-2.3309)
undersize Minimum 59.14 (2.328)
Main journal taper and out-of-round mm (in) 0.05 (0.002) max.
Standard Standard 50.940-50.955 (2.0055—2.0061)
size Minimum 50.89 (2.004)
0.25 (0.010) Standard 50.690-50.705 (1.9957-1.9963)
Crankpin diameter undersize Minimum 50.64 (1.994) mm (in) 0.50 (0.020) Standard 50.440-50.455 (1.9858—1.9864)
undersize Minimum 50.39 (1.984)
0.75 (0.030) Standard 50.190-50.205 (1.9760-1.9766)
undersize Minimum 50.14 (1.974)
Crankpin taper and out-of-round mm (in) 0.05 (0.002) max.

Main bearing

Main journal bearing
oil
clearance Standard 0.031-0.050 (0.0012-0.0020)
mm (in) Maximum 0.08 (0.0031)
Available undersize bearina mm fin) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Crankpin bearing

Crankpin bearing
oil
clearance mm (in) Standard 0.027-0.055 (0.0011-0.0022) Crankpin bearing
oil
clearance mm (in) Maximum 0.08 (0.0031)
Available undersize bearing mm (in) 0.25 (0.010), 0.50 (0.020), 0.75 (0.030)

Thrust bearina (center main bearina)

Crankshaft end play mm (in) Standard 0.04-0.282 (0.0016—0.0111) Crankshaft end play mm (in) Maximum 0.30 (0.012)
Bearing width mm (in) Standard size 2.00-2.05 (0.0787-0.0807) Bearing width mm (in) Oversize 2.175-2.225 (0.0856-0.0876)

Timing belt

Deflection mm (in)/N (ka,
lb)
9.0-11.5 (0.35--0.45V98 (10,
22)
Drive belt deflection

Alternator mm (in) New 8-10 (0.31-0.39) Alternator mm (in) Used 9-11 (0.35-0.43)
A/C compressor mm (in) New 8.5-9.5 (0.33-0.37) A/C compressor mm (in) Used 9.5-10.5 (0.37-0.41)
Vacuum pump mm (in) New 7.5-8.5 (0.30—0.33) Vacuum pump mm (in) Used 8.5-9.5 (0.33-0.37)
P/S pump with vacuum pump mm (in) New 6.5-7.5 (0.26—0.30) P/S pump with vacuum pump mm (in) Used 7.0-8.0 (0.28—0.31)
Pressure wave supercharger
mm
(in) New 4.0-5.0 (0.16-0.20) Pressure wave supercharger
mm
(in) Used 4.5-5.5 (0.18-0.22)

30—13

30 TECHNICAL DATA
2A. LUBRICATION SYSTEM (GASOLINE)
Engine model Item ____ FE DOHC F6, F8, FE SOHC

Lubrication method Force-fed

Oil pump

Type Trochoid gear Crescent gear
Regulated pressure kPa (kg/cm2
psi)
490 (5.0,
71)
392 (4.0, 57)
Oil pressure kPa (kg/cm2,
psi)
1,000 rpm 147-245 (1.5-2.5, 21-36) 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)
Inner rotor tooth
tip to
outer rotor
clearance
mm
(in)
Standard 0.044-0.084 (0.0017-0.0033)

—

Inner rotor tooth
tip to
outer rotor
clearance
mm
(in) Maximum 0.18 (0.0071)

—
Outer rotor
to
body clearance
mm
(in) Standard 0.09-0.176 (0.0035-0.0069)
—
Outer rotor
to
body clearance
mm
(in) Maximum 0.20 (0.008)
—

Side clearance
mm
(in) Standard 0.03-0.09 (0.0012-0.0035)

—

Side clearance
mm
(in) Maximum 0.10 (0.004)

—

Inner gear tooth tip
to
crescent clearance
mm
(in)
Standar

—

0.267-0.38 (0.011-0.015) Inner gear tooth tip
to
crescent clearance
mm
(in) Maximum

—

0.40 (0.016)
Outer gear tooth tip
to
crescent clearance
mm
(in)
Standard

—

0.20-0.32 (0.008-0.0126) Outer gear tooth tip
to
crescent clearance
mm
(in) Maximum
—
0.35 (0.0138)
Outer gear
to
body
clearance
mm
(in)
Standard
—
0.09-0.184 (0.0035-0.0072) Outer gear
to
body
clearance
mm
(in) Maximum

—

0.20 (0.008)
Side clearance mm (in) Standard

—

0.03-0.063 (0.0012-0.0025) Side clearance mm (in) Maximum

—

0.10 (0.004)

Oil filter

Type Full flow, paper element
Relief pressure differential kPa (kg/cm2,
psi)
78-118 (0.8-1.2, 11-17)

Oil cooler

Type
!
Water cooled

Oil pressure switch

Activation pressure kPa (kg/cm2,
psi)
29 (0.3, 4.3)

Enaine oil

Capacity liters (US qt, Imp
qt)

Total (drv enaine) 4.3 (4.5, 3.8)
Capacity liters (US qt, Imp
qt)
Oil
Dan
3.6 (3.8, 3.2) Capacity liters (US qt, Imp
qt)

Oil filter 0.2(0.21,0.18)
|
0.3 (0.32,0.26)
Grade (API service) SD, SE,
or
SF
Viscosity
number
30°C (86°F)
or
over SAE
40

Viscosity
number
0°C—40°C (32°F—104°F) SAE
30

Viscosity
number
-10°C—20°C (14°F—68°F) SAE 20W-20
Viscosity
number
-10°C—50°C (14°F—122°F)
or
over SAE 20W-40
or
20W-50 Viscosity
number -25°C—30°C (-13°F—86°F) SAE 10W-30 Viscosity
number
-25°C—50°C (-13°F—122°F)
or
over SAE 10W-40
or
10W-50
Viscosity
number
0°C—30°C (32°F—22°F)
or
below SAE 5W-30
Viscosity
number
-20°C (—4°F)
or
below SAE 5W-20

30-14