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Engine Specifications

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL SPECIFICATIONS

Application Specification
Displacement 152 Cu. In. (2.5L)
Bore 3.33" (84.6 mm)
Stroke 2.92" (74.2 mm)
Compression Ratio 9.3:1
Fuel System MFI
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

Application In. (mm)
Crankshaft
End Play
Standard .0032-.0111 (.081-.282)
Maximum .0125 (.318)
Maximum Runout .0006 (.015)
Main Bearings
Journal Diameter
Standard 2.4385-2.4391 (61.938-61.953)
.010" (.25 mm) Undersize 2.4287-2.4293 (61.688-61.704)
Journal Out-Of-Round .002 (.05)
Journal Taper .002 (.05)
Oil Clearance
Standard .0015-.0022 (.038-.056)
Maximum .0025 (.064)
Connecting Rod Bearings
Journal Diameter
Standard 2.0843-2.0848 (52.941-52.954)
.010" (.25 mm) Undersize 2.0745-2.0750 (52.692-52.705)
Journal Out-Of-Round .002 (.05)
Journal Taper .002 (.05)
Oil Clearance
Standard .0010-.0016 (.025-.041)
Maximum .0032 (.079)
CONNECTING RODS

Application In. (mm)
Pin Bore Diameter .7852-.7858 (19.943-19.961)
Crankpin Bore Diameter 2.2047-2.2053 (56.000-56.015)
Center-To-Center Length 5.426-5.429 (137.82-137.90)
Maximum Bend .002 Per 1.969 (.05 Per 50.01)
Side Play
Standard .0070-.0130 (.178-.330)
Maximum .016 (.41)
PISTONS, PINS & RINGS

Application In. (mm)
Pistons
Clearance
Standard .0012-.0022 (.030-.056)
Maximum .005 (.13)
Diameter
Standard 3.3249-3.3262 (84.452-84.487)
.010" (.25 mm) Oversize 3.3347-3.3360 (84.701-84.737)
.020" (.50 mm) Oversize 3.3446-3.3459 (84.951-84.987)
Pin Bore Diameter .7869-.7874 (19.988-20.000)
Pins
Diameter .7864-.7866 (19.975-19.980)
Piston Fit .0004-.0010 (.010-.025)
Rod Fit (Interference Fit) -.0006- -.0014 (-.013- -.037)
Rings
No. 1
End Gap (1) .006-.012 (.15-.30)
Side Clearance (2) .0008-.0025 (.020-.065)
No. 2
End Gap (1) .010-.016 (.25-.40)
Side Clearance (2) .0012-.0025 (.030-.065)
No. 3 (Oil)
End Gap (1) .008-.028 (.20-.70)
Side Clearance (2) .0028-.0062 (.07-.16)
(1) Maximum end gap is .040" (1.0 mm).
(2) Maximum side clearance is .006" (.15 mm).
CYLINDER BLOCK

Application In. (mm)
Cylinder Bore
Diameter
Standard 3.3268-3.3276 (84.501-84.521)
.010" (.25 mm) Oversize 3.3367-3.3374 (84.752-84.770)
.020" (.50 mm) Oversize 3.3465-3.3473 (85.001-85.021)
Maximum Taper .0009 (.023)
Maximum Out-Of-Round .0008 (.020)
Maximum Deck Warpage .006 (.15)
VALVES & VALVE SPRINGS

Application Specification
Intake Valves
Face Angle 45 Degrees
Head Diameter 1.253-1.265" (31.85-32.15 mm)
Minimum Margin .035" (.89 mm)
Valve Length
Standard 3.748" (95.20 mm)
Minimum 3.707" (94.16 mm)
Stem Diameter
Standard .2350-.2356" (5.970-5.984 mm)
Minimum .2331" (5.921 mm)
Exhaust Valves
Face Angle 45 Degrees
Head Diameter 1.080-1.092" (27.45-27.75 mm)
Minimum Margin .039" (1.00 mm)
Valve Length
Standard 3.748" (95.20 mm)
Minimum 3.707" (94.16 mm)
Stem Diameter
Standard .2348-.2354" (5.964-5.979 mm)
Minimum .2329" (5.916 mm)
Valve Springs
Free Length 1.847" (46.91 mm)
Out-Of-Square .064" (1.60 mm)
Lbs. @ In. (kg @ mm) 
Pressure
Intake & Exhaust Valve 40-45 @ 1.524 (18-20 @ 38.70)
CYLINDER HEAD

Application Specification
Cylinder Head Height 5.252-5.260" (133.40-133.60 mm)
Maximum Warpage (1)
Cylinder Block Surface .004" (.10 mm)
Manifold Surface .004" (.10 mm)
Valve Installed Height
Standard 1.634-1.653" (41.5-42.0 mm)
Serviceable 1.658-1.693" (42.1-43.0 mm)
Valve Seats
Intake Valve
Seat Angle 45 Degrees
Seat Width .032-.055" (.81-1.40 mm)
Exhaust Valve
Seat Angle 45 Degrees
Seat Width .032-.055" (.81-1.40 mm)
Valve Guides
Intake Valve
Valve Guide I.D. .2366-.2374" (6.01-6.03 mm)
Valve Guide Installed Height .579-.602" (14.7-15.3 mm)
Valve Stem-To-Guide Oil Clearance
Standard .0010-.0024" (.025-.060 mm)
Maximum .008" (.20 mm)
Exhaust Valve
Valve Guide I.D. .2366-.2374" (6.01-6.03 mm)
Valve Guide Installed Height .480-.504" (12.2-12.8 mm)
Valve Stem-To-Guide Oil Clearance
Standard .0012-.0026" (.030-.065 mm)
Maximum .008" (.20 mm)
(1) DO NOT remove more than .006" (.15 mm) material from original surface of cylinder head.
CAMSHAFT

Application In. (mm)
End Play
Standard .0020-.0039 (.051-.100)
Maximum .0055 (.140)
Journal Runout .0008 (.020)
Journal Diameter (1)(2)
No. 1 Journal
Left Exhaust Camshaft
Standard 1.1802-1.1809 (29.977-29.995)
Minimum 1.1781 (29.924)
Left Intake Camshaft
Standard 1.0213-1.0220 (25.941-25.959)
Minimum 1.0193 (25.890)
Right Exhaust Camshaft
Standard 1.0213-1.0220 (25.941-25.959)
Minimum 1.0193 (25.890)
Right Intake Camshaft
Standard 1.1802-1.1809 (29.977-29.995)
Minimum 1.1781 (29.924)
 
No. 2, 3 & 4 Journals
Standard 1.0201-1.0208 (25.910-25.928)
Minimum 1.0181 (25.860)
No. 5 Journal
Standard 1.0213-1.0220 (25.941-25.959)
Minimum 1.0193 (25.890)
Oil Clearance (2)
No. 1 & 5 Journals
Standard .0016-.0032 (.041-.079)
Maximum .0047 (.119)
No. 2, 3 & 4 Journals
Standard .0028-.0043 (.071-.109)
Maximum .0059 (.150)
Lobe Height
Exhaust
Standard 1.7076 (43.373)
Minimum 1.6997 (43.172)
Intake
Standard 1.6867 (42.842)
Minimum 1.6788 (42.642)
(1) Left and right as viewed from rear of engine.
(2) The No. 1 journal is timing belt end, and No. 5 journal is flywheel end.
HYDRAULIC LASH ADJUSTERS

Application In. (mm)
Oil Clearance
Standard .0010-.0026 (.025-.066)
Maximum .0071 (.180)
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