1997 MAZDA MX-5 width

Fig. 17: Measuring Installed Valve & Guide Height
Courtesy of MAZDA MOTORS CORP.
Valve Seat
1. Service valve guide before valve seat. Valve seat replacement information is not available from
manufacturer. Inspect valve seat for roughness and damage. Check valve seat angle and seat width.
2. Measure seat contact width on valve and ensure seat contact position is in center of valve face. Service
seat if angle and width are not within specification. See CYLINDER HEAD
under ENGINE
SPECIFICATIONS. Measure valve installed height after servicing valve seat. See Fig. 17
. See VALVE
INSTALLED HEIGHT .
3. If valve installed height is within serviceable range, install adjusting shim on spring seat. If installed
height exceeds serviceable range, replace cylinder head.
VALVE INSTALLED HEIGHT
ApplicationIn. (mm)
Miata & Protege

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 26 © 2005 Mitchell Repair Information Company, LLC.

Valves
Check valve face angle, head diameter, margin thickness and stem diameter. Service or replace valves if
measurements are not within specifications. See VALVES & VALVE SPRINGS
under ENGINE
SPECIFICATIONS.
Valve Seat Correction Angles
Measure seat contact width on valve. See VALVE SEAT. If seat width is not within specification or if valve
face does not contact center of valve seat, correct seat using a 70-degree grinding stone. After correcting seat,
lightly finish seat with 45-degree grinding stone.
VALVE TRAIN
Hydraulic Lash Adjusters
1. Remove camshaft cover. Check movement of each Hydraulic Lash Adjuster (HLA) by pushing
downward using hand pressure only. If HLA compresses, replace HLA. To remove HLA, remove
camshafts. See CAMSHAFT
under REMOVAL & INSTALLATION. Mark location of HLA before
removing from bore. Lift HLA from cylinder head.
2. Inspect HLA friction surfaces for wear and damage. Replace HLA if required. Coat HLA with engine oil
and install in original location. Ensure HLA moves smoothly in bore by using small magnet attached to
HLA.
CYLINDER BLOCK ASSEMBLY
Piston & Connecting Rod Assembly
1. Before removing rod cap from crankshaft, measure and record rod side play. See CONNECTING RODS
under ENGINE SPECIFICATIONS. Before removing connecting rods, measure and record connecting
rod bearing oil clearance. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS
under
ENGINE SPECIFICATIONS.
2. Before separating piston from connecting rod, mark piston in relation to connecting rod. Check
oscillation movement of piston and rod assembly (hold piston horizontally, lift rod and allow rod to drop
by its own weight). If pin binds in pin bore (rod does not drop), replace piston and/or pin as necessary.
3. To separate components, press piston pin out of piston and rod assembl
y, noting pressure required to
Normal1.772-1.791 (45.00-45.50)
Serviceable1.733-1.772 (45.60-46.50)
NOTE: If hydraulic lash adjusters are persistently noisy, check with manufacturer
for availability of modified adjusters.
NOTE: During disassembly, match mark components for reassembly reference.

1997 Mazda MX-5 Miata
1997-98 ENGINES 1.8L 4-Cylinder
Microsoft
Sunday, July 05, 2009 1:55:15 PMPage 27 © 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.

water when cleaning the horn pad. Solvents or cleaners could adversely affect the air bag cover and cause
improper deployment of the system.
AIR CONDITIONING SERVICING
ANTI-LOCK BRAKE SYSTEM
On models equipped with anti-lock brake systems, ALWAYS observe the following cautions:
DO NOT attempt to bleed hydraulic system without first referring to the appropriate ANTI-LOCK
BRAKE SYSTEM article in the BRAKES Section.
DO NOT mix tire sizes. As long as tires remain close to the original diameter, increasing the width is
acceptable. Rolling diameter must be identical for all 4 tires. Some manufacturers recommend tires of the
same brand, style and type. Failure to follow this precaution may cause inaccurate wheel speed readings.
Use ONLY recommended brake fluids. DO NOT use silicone brake fluids in an ABS-equipped vehicle.
BATTERY WARNING WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all warnings and service precautions. See appropriate AIR BAG
RESTRAINT SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT.
CAUTION: Disconnect negative battery cable before servicing any air bag system,
steering column or passenger side dash component. After any repair, turn
ignition key to the ON position from passenger's side of vehicle in case of
accidental air bag inflation
CAUTION: Avoid breathing R-134a refrigerant and PAG lubricant vapors, exposure
may irritate eyes, nose and throat. To remove R-134a from system use R-
134a recycling equipment that meets SAE J2210 specifications. If
accidental system discharge occurs, ventilate work area before resuming
service.
WARNING:R-134a service equipment or vehicle A/C systems SHOULD NOT be
pressure tested or leak tested with compressed air. Some mixtures of
air/R134a have shown to be combustible at elevated pressures. These
mixtures are dangerous and may cause fire and/or explosions. See AIR
CONDITIONING SERVICE article in GENERAL INFORMATION section.
CAUTION: The anti-lock brake system contains electronic equipment that can be
susceptible to interference caused by improperly installed or high output
radio transmitting equipment. Since this interference could cause the
possible loss of the anti-lock braking capability, such equipment should
be installed by qualified professionals.

1997 Mazda MX-5 Miata
MAINTENANCE INFORMATION 1997 MAINTENANCE Mazda Maintenance Information
Microsoft
Sunday, July 05, 2009 1:41:19 PMPage 5 © 2005 Mitchell Repair Information Company, LLC.