engine MAZDA MIATA 1997 Factory Manual PDF

OIL PUMP
Removal & Disassembly
1. Disconnect negative battery cable. Remove dipstick, tube and "O" ring. Drain engine oil and coolant.
Remove drive belts, crankshaft and water pump pulleys. Remove generator, A/C compressor and
mounting bracket. Without disconnecting A/C hoses, secure A/C compressor away from engine. Remove
timing belt and related components. See TIMING BELT
under REMOVAL & INSTALLATION.
2. Hold crankshaft sprocket in place and remove crankshaft sprocket bolt. Remove crankshaft sprocket
using steering wheel puller. Leave crankshaft Woodruff key in place.
3. Remove oil pan and oil pump pick-up tube. See OIL PAN
under REMOVAL & INSTALLATION.
Remove oil pump housing assembly. Using a screwdriver protected with a rag, drive oil seal out from
inside of oil pump housing assembly.
4. Remove pump cover screws (use a manual impact screwdriver, if necessary). See Fig. 22
. Remove pump
cover. Note location of alignment marks on inner and outer rotors. Remove inner and outer rotors. To
remove pressure relief valve, remove spring seat, pressure spring and control plunger.
Inspection
Replace pressure relief valve spring if length is not as specified. See OIL PUMP SPECIFICATIONS. Ensure
plunger slides freely in bore. Replace oil pump housing assembly if clearances are not as specified. See OIL
PUMP SPECIFICATIONS .
Reassembly & Installation
1. Apply oil to friction surfaces. Install inner and outer rotors with marks aligned. See Fig. 23 . Install
pressure relief valve components. Apply oil to lip of NEW oil seal. Press oil seal into bore until even with
face of oil pump housing assembly.
2. Install pump cover. Tighten screws to 53-78 INCH lbs. (6-9 N.m). To complete installation, reverse
removal procedure. Tighten bolts to specification. See TORQUE SPECIFICATIONS
.
OIL PUMP SPECIFICATIONS
ApplicationW/O Filter Qts. (L)W/Filter Qts. (L)
Miata & Protege3.8 (3.6)4.0 (3.8)
ApplicationMaximum Clearance In. (mm)
Maximum Rotor Tip Clearance (1) .0079 (.20)
Maximum Rotor-To-Pump Body Clearance (2) .0079 (.20)
Maximum Rotor Side Clearance (3) .0055 (.14)
Pressure Relief Spring Free Length1.809 (45.94)
(1)See Fig. 23 .
(2)Insert feeler gauge between outer rotor and pump body.
Place straightedge across pump body and check clearance between straightedge and both rotors.

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 33 © 2005 Mitchell Repair Information Company, LLC.

Fig. 22: Exploded View Of Oil Pump
Courtesy of MAZDA MOTORS CORP.
(3)

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 34 © 2005 Mitchell Repair Information Company, LLC.

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.