1997 MAZDA MX-5 engine

Fig. 23: Aligning Marks On Inner & Outer Rotor
Courtesy of MAZDA MOTORS CORP.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
ApplicationFt. Lbs. (N.m)
Axle Shaft Nut (Protege)174-235 (235-319)
Camshaft Sprocket Bolt36-45 (49-61)
Compressor Bracket-To-Engine Bolt28-38 (38-51)
Connecting Rod Cap Nut35-37 (48-50)
Crankshaft Pulley Bolts9-13 (12-18)
Crankshaft/Timing Belt Sprocket Bolt116-123 (157-167)
Crossmember-To-Frame Bolt47-66 (63-89)
Cylinder Head Bolt (2) 56-60 (76-81)
Distributor Bolt14-19 (19-26)
Drive Shaft Bolts (Miata)37-43 (50-58)
Engine Mount Nut42-58 (57-79)
Engine Mount-To-Engine Bolt27-40 (37-54)
Engine Mount-To-Frame Nut
Miata42-57 (57-77)
Protege28-38 (38-51)
Exhaust Header Pipe-To-Exhaust

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 35 © 2005 Mitchell Repair Information Company, LLC.

ENGINE SPECIFICATIONS
GENERAL SPECIFICATIONS
Manifold Nut23-34 (31-46)
Exhaust Manifold Nut(1) 28-34 (38-46)
Flywheel Bolt71-76 (96-103)
Fuel Rail Bolt14-19 (19-26)
Generator Top Bolt27-38 (37-51)
Intake Manifold Bolt/Nut(1) 14-19 (19-26)
Intake Manifold Support Bracket14-18 (19-25)
Main Bearing Cap Bolt
Step 1(1) 22-27 (30-37)
Step 2 (Final)(1) 40-43 (54-58)
Oil Pan-To-Transaxle Bolt (Protege)28-38 (38-51)
Oil Pan-To-Transmission Bolt (Miata)48-65 (64-88)
Oil Pump-To-Block Bolt14-19 (19-26)
Power Steering Pump-To-Bracket Bolt28-38 (38-51)
PPF/Differential Spacer Mounting Bolt (2) 27-38 (37-51)
PPF-To-Differential Long Mounting Bolt (2) 77-91 (104-123)
PPF-To-Transmission Side Mounting Bolt (2) 77-91 (104-123)
PPF/Transmission Rear Bracket Mounting Bolt27-40 (37-54)
Spark Plug11-16 (15-22)
Timing Belt Tensioner Bolt27-38 (37-51)
Water Pump Bolt14-19 (19-26)
INCH Lbs. (N.m)
Camshaft Bearing Cap Bolt(3) 100-125 (11.3-14.1)
Cylinder Head Cover Bolt43-78 (5-9)
Oil Jet104-156 (12-18)
Oil Pan-To-Engine Block Bolt
(Miata & Protege)70-95 (8-11)
Oil Pump Cover Screws53-78 (6-9)
Oil Strainer Bolt70-95 (8-11)
Rear Cover Bolt70-95 (8-11)
Water Pump Pulley Bolt70-95 (8-11)
(1)Tighten evenly to specification in alternating sequence.
(2)Tighten in sequence. See Fig. 7 .
(3)Tighten in sequence. See Fig. 10 or Fig. 11 .

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 36 © 2005 Mitchell Repair Information Company, LLC.

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS
CONNECTING RODS
ApplicationSpecification
Displacement112.2 Cu. In. (1.8L)
Bore3.27" (83.0 mm)
Stroke3.35" (85.0 mm)
Compression Ratio
Miata9.0:1
Protege8.9:1
Fuel SystemPFI
Horsepower @ RPM
Miata128 @ 6500
Protege103 @ 5500
Torque Ft. Lbs. @ RPM
Miata110 @ 5000
Protege111 @ 4000
ApplicationIn. (mm)
Crankshaft
End Play
Standard.0032-.0111 (.080-.282)
Maximum.0118 (.30)
Maximum Runout.0016 (.04)
Main Bearings
Journal Diameter
Standard Bearings1.9661-1.9667 (49.938-49.956)
Journal Out-Of-Round.002 (.05)
Oil Clearance
Standard.0008-.0014 (.020-.036)
Maximum.004 (.10)
Connecting Rod Bearings
Journal Diameter
Standard Bearings1.7693-1.7699 (44.940-44.956)
Journal Out-Of-Round.002 (.05)
Oil Clearance
Standard.0008-.0027 (.020-.068)
Maximum.0039 (.100)

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 37 © 2005 Mitchell Repair Information Company, LLC.

CONNECTING RODS
PISTONS, PINS & RINGS
PISTONS, PINS & RINGS
ApplicationIn. (mm)
Bore Diameter
Crankpin Bore1.8898-1.8904 (48.000-
48.016)
Pin Bore.7876-.7879 (20.003-20.014)
Center-To-Center Length5.231-5.234 (132.85-132.95)
Maximum Bend(1)
Side Play
Standard.0044-.0103 (.110-.262)
Maximum.012 (.30)
(1)Bend must not exceed .003" per 1.97" (.075 mm per 50 mm).
ApplicationIn. (mm)
Pistons
Clearance
Standard
Miata.0013-.0023 (.032-.059)
Protege.0010-.0014 (.024-.037)
Maximum.006 (.15)
Diameter
Standard3.2660-3.2666 (82.954-82.974)
Oversize
.010" (0.25 mm)3.2761-3.2762 (83.211-
83.217)
.020" (0.50 mm)3.2859-3.2860 (83.461-
83.467)
Pins
Diameter.7869-.7871 (19.987-19.993)
Piston Fit-.0002-.0005 (-.005-.013)
Rings
No. 1
End Gap
Standard.006-.011 (.15-.30)
Maximum.039 (1.0)
Side Clearance
Standard.0012-.0025 (.030-.065)
Maximum.006 (.15)

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 38 © 2005 Mitchell Repair Information Company, LLC.

CYLINDER BLOCK
CYLINDER BLOCK
CYLINDER HEAD
CYLINDER HEAD
No. 2
End Gap
Standard.006-.011 (.15-.30)
Maximum.039 (1.0)
Side Clearance
Standard.0012-.0027 (.030-.070)
Maximum.006 (.15)
No. 3 (Oil)
End Gap
Standard.008-.027 (.20-.70)
Maximum.039 (1.0)
ApplicationIn. (mm)
Cylinder Bore
Standard3.2678-3.2684 (83.000-
83.019)
Oversize
.010" (0.25 mm)3.2778-3.2780 (83.256-
83.263)
.020" (0.50 mm)3.2877-3.2879 (83.506-
83.513)
Maximum Taper & Out-Of-Round.0007 (.019)
Minimum Deck Height (1) 8.720 (221.5)
Maximum Deck Warpage.006 (.15)
(1)DO NOT machine more than .008" (.20 mm) from cylinder block deck surface.
ApplicationSpecification
Cylinder Head
Height5.268-5.275" (133.8-134.0 mm)
Grinding Limit.004" (.10 mm)
Maximum Warpage.004" (.10 mm)
Valve Seats
Intake Valve
Seat Angle45°
Seat Width.032-.055" (0.80-1.40 mm)

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 39 © 2005 Mitchell Repair Information Company, LLC.

VALVES & VALVE SPRINGS
VALVES & VALVE SPRINGS
Exhaust Valve
Seat Angle45°
Seat Width.032-.055" (0.80-1.40 mm)
Valve Guides
Intake Valve
Valve Guide I.D..2367-.2374" (6.01-6.03 mm)
Valve Guide Installed
Height.721-.744" (18.3-18.9 mm)
Valve Stem-To-Guide Oil Clearance
Standard.0010-.0023" (.025-.060 mm)
Maximum.008" (.20 mm)
Exhaust Valve
Valve Guide I.D..2367-.2374" (6.01-6.03 mm)
Valve Guide Installed
Height.721-.744" (18.3-18.9 mm)
Valve Stem-To-Guide Oil Clearance
Standard.0012-.0025" (.030-.065 mm)
Maximum.008" (.20 mm)
ApplicationSpecification
Valves
Face Angle45°
Installed Height
Normal1.772-1.791" (45.00-45.50 mm)
Serviceable1.733-1.772" (45.60-46.50 mm)
Minimum Margin
Intake.035" (0.9 mm)
Exhaust.039" (1.0 mm)
Refinish Length
Miata
Intake
Standard4.0114" (101.89 mm)
Minimum3.9524" (100.39 mm)
Exhaust
Standard4.0153" (101.99 mm)
Minimum3.9563" (100.49 mm)
Protege
Intake

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 40 © 2005 Mitchell Repair Information Company, LLC.

CAMSHAFT
CAMSHAFT
Standard3.9741-4.0055" (100.94-
101.74 mm)
Minimum3.9701" (100.84 mm)
Exhaust
Standard3.9780-4.0094" (101.04-
101.84 mm)
Minimum3.9661" (100.74 mm)
Stem Diameter
Intake
Standard.2351-.2356" (5.970-5.985 mm)
Minimum.2331" (5.920 mm)
Exhaust
Standard.2349-.2354" (5.965-5.980 mm)
Minimum.2329" (5.915 mm)
Valve Springs
Free Length
1.821" (46.26 mm)
Maximum Out-Of-Square
.064" (1.62 mm)
Lbs. @ In. (kg @ mm)
Compressed Length
Minimum51-55 @ 1.555 (23-25 @ 39.50)
ApplicationIn. (mm)
End Play
Standard.0028-.0074 (.07-.19)
Maximum.008 (.20)
Journal Diameter1.0213-1.0222 (25.940-25.965)
Maximum Journal Out-Of-Round.0012 (.03)
Maximum Journal Runout.0012 (.03)
Journal Oil Clearance
Standard.0014-.0031 (.035-.081)
Maximum.006 (.15)
Lobe Height
Standard
Intake1.7360 (44.094)
Exhaust1.7559 (44.600)
Minimum

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 41 © 2005 Mitchell Repair Information Company, LLC.

VALVE LIFTERS
VALVE LIFTERS
Intake1.7281 (43.894)
Exhaust1.7480 (44.400)
ApplicationIn. (mm)
Bore Diameter1.1811-1.1821 (30.000-30.025)
Lifter Diameter1.1795-1.1802 (29.959-29.975)
Oil Clearance
Standard.0010-.0026 (.025-.066)
Maximum.0071 (.180)

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 42 © 2005 Mitchell Repair Information Company, LLC.