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Technical Data

NOTE: For M54/M56 technical data, refer to ENGINE - TECHNICAL DATA .
GENERAL SPECIFICATIONS (M52/M52TU/S52)

Application Specification
2.5L(1)
Displacement 152 Cu. In. (2.5L)
Bore 3.310" (84 mm)
Stroke 2.950" (75 mm)
Compression Pressure (1)
Compression Ratio 10.5:1
Fuel System SFI
2.8L
Displacement 170 Cu. In. (2.8L)
Bore 3.307" (84 mm)
Stroke 3.307" (84 mm)
Compression Pressure (1)
Compression Ratio 10.2:1
Fuel System SFI
3.2L
Displacement 195 Cu. In. (3.2L)
Bore 3.401" (86.4 mm)
Stroke 3.527" (89.6 mm)
Compression Pressure (1)
Compression Ratio 10.5:1
Fuel System SFI
(1) Additional 2.5L specifications are not available.
OIL PUMP WITH STRAINER & DRIVE (OIL PRESSURE)

Oil pressure at idle speed with engine at operating temperature min bar 0.5
Regulated pressure bar 4.0
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

Application In. (mm)
2.8L
Crankshaft
End Play 0.0031-0.0064 (0.080-0.163)
Runout 0.008 (0.20)
Main Bearings
Journal Diameter
Standard
Yellow 2.3616-2.3618 (59.984-59.990)
Green 2.3613-2.3615 (59.977-59.983)
White 2.3611-2.3613 (59.971-59.977)
Undersize 1 - 0.001" (0.25 mm)
Yellow 2.3517-2.3520 (59.733-59.740)
Green 2.3515-2.3517 (59.727-59.733)
White 2.3512-2.3514 (59.721-59.726)
Undersize 2 - 0.023" (0.59 mm)
Yellow 2.3419-2.3421 (59.484-59.490)
Green 2.3416-2.3418 (59.477-59.483)
White 2.3414-2.3416 (59.471-59.477)
Journal Out-Of-Round (1)
Journal Taper (1)
Oil Clearance 0.0008-0.0023 (0.020-0.058)
Connecting Rod Bearings
Journal Diameter
Standard 1.7707-1.7634 (44.975-44.791)
Undersize 1 1.7608-1.7614 (44.725-44.741)
Undersize 2 1.7509-1.7516 (44.475-44.491)
Journal Out-Of-Round (1)
Journal Taper (1)
Oil Clearance 0.0008-0.0022 (0.020-0.055)
3.2L
Crankshaft
End Play 0.0031-0.0064 (0.080-0.163)
Runout 0.008 (0.20)
Main Bearings
Journal Diameter
Standard
Yellow 2.3616-2.3618 (59.984-59.990)
Green 2.3613-2.3615 (59.977-59.983)
White 2.3611-2.3613 (59.971-59.977)
Undersize 1 - 0.001" (0.25 mm)
Yellow 2.3517-2.3520 (59.733-59.740)
Green 2.3515-2.3517 (59.727-59.733)
White 2.3512-2.3514 (59.721-59.726)
Undersize 2 - 0.019" (0.50 mm)
Yellow 2.3419-2.3421 (59.484-59.490)
Green 2.3416-2.3418 (59.477-59.483)
White 2.3414-2.3416 (59.471-59.477)
Journal Out-Of-Round (1)
Journal Taper (1)
Oil Clearance 0.0008-0.0023 (0.020-0.058)
Connecting Rod Bearings
Journal Diameter
Standard 1.7716 (45.00)
Undersize 1 1.7618 (44.75)
Undersize 2 1.7519 (44.50)
Journal Out-Of-Round (1)
Journal Taper (1)
Oil Clearance 0.0008-0.0022 (0.020-0.055)
(1) Information is not available from manufacturer.
CONNECTING RODS

Application In. (mm)
2.8L
Bushing Pin Bore Diameter
Outside 0.9449-0.9461 (24.000-24.031)
Inside 0.8663-0.8665 (22.005-22.010)
Crankpin Bore Diameter
Red 1.8898-1.8901 (48.000-48.009)
Blue 1.8901-1.8904 (48.009-48.016)
Center-To-Center Length (1)
Maximum Bend 0.0016 (0.040)
Maximum Twist 0.002 (0.05)
Side Play (1)
3.2L
Bushing Pin Bore Diameter
Outside 0.9457-0.9446 (24.021-23.995)
Inside 0.8665-0.8659 (22.010-21.995)
Crankpin Bore Diameter 1.8898-1.8904 (48.000-48.016)
Center-To-Center Length (1)
Maximum Bend 0.0016 (0.040)
Maximum Twist 0.002 (0.05)
Side Play (1)
(1) Information is not available from manufacturer.
PISTONS, PINS & RINGS

Application In. (mm)
2.8L
Piston
Clearance
Standard 0.0004-0.0016 (0.010-0.040)
Maximum 0.0043 (0.11)
Diameter
Standard 3.3063 (83.980)
Intermediate 3.3094 (84.060)
Oversize 1 3.3161 (84.230)
Oversize 2 3.3260 (84.480)
Pins
Diameter (1)
Piston Fit (2)
Rod Fit (1)
Rings
No. 1 (Plain)
End Gap 0.008-0.016 (0.20-0.40)
Side Clearance 0.0008-0.0023 (0.020-0.060)
No. 2 (Tapered)
End Gap 0.008-0.016 (0.20-0.40)
Side Clearance 0.0008-0.0025 (0.020-0.065)
No. 3 (Oil)
End Gap 0.016-0.055 (0.40-1.40)
Side Clearance (1)
3.2L
Piston
Clearance
Standard 0.0010-0.0022 (0.026-0.058)
Maximum 0.0043 (0.11)
Diameter
Standard 3.4001 (86.365)
Oversize 1 3.4080 (86.565)
Pins
Diameter (1)
Piston Fit (2)
Rod Fit (1)
Rings
No. 1 (Plain)
End Gap 0.009-0.016 (0.25-0.40)
Side Clearance 0.0011-0.0025 (0.030-0.065)
No. 2 (Tapered)
End Gap 0.008-0.016 (0.20-0.40)
Side Clearance 0.0008-0.0021 (0.020-0.055)
No. 3 (Oil)
End Gap 0.098-0.019 (0.25-0.50)
Side Clearance 0.0008-0.0021 (0.020-0.055)
(1) Information is not available from manufacturer.
(2) Thumb pressure.
CYLINDER BLOCK

Application In. (mm)
2.8L
Cylinder Bore Diameter
Standard 3.3071-3.3076 (84.000-84.014)
Oversize 1(1) 3.3170-3.3163 (84.250-84.234)
Oversize 2(2) 3.3268-3.3667 (84.500-85.514)
Maximum Taper 0.0004 (0.010)
Maximum Out-Of-Round 0.0004 (0.010)
3.2L
Cylinder Bore Diameter 3.4015-3.3863 (86.400-86.014)
Maximum Taper 0.0004 (0.010)
Maximum Out-Of-Round 0.0002 (0.005)
(1) Aluminum block with cast iron liners or cast iron block.
(2) Cast iron block only.
VALVES & VALVE SPRINGS

Application Specification
2.8L
Intake Valves
Face Angle 45°
Head Diameter 1.299" (33.0 mm)
Minimum Margin (1)
Minimum Refinish Length (1)
Stem Diameter 0.235" (5.975 mm)
Valve Tip Maximum Refinish (1)
Exhaust Valves
Face Angle 45°
Head Diameter 1.201" (30.5 mm)
Minimum Margin (1)
Minimum Refinish Length (1)
Stem Diameter 0.234" (5.960 mm)
Valve Tip Maximum Refinish (1)
Valve Springs (1)
3.2L
Intake Valves
Face Angle 45°
Head Diameter 1.181" (30.0 mm)
Minimum Margin (1)
Minimum Refinish Length (1)
Stem Diameter 0.236" (6.0 mm)
Valve Tip Maximum Refinish (1)
Exhaust Valves
Face Angle 45°
Head Diameter 1.062" (27 mm)
Minimum Margin (1)
Minimum Refinish Length (1)
Stem Diameter 0.236" (6.0 mm)
Valve Tip Maximum Refinish (1)
Valve Springs (1)
(1) Information is not available from manufacturer.
CYLINDER HEAD

Application Specification
2.8L
Cylinder Head Height
New 5.512" (140.00 mm)
Minimum 5.500" (139.70 mm)
Maximum Warpage 0.0012" (0.03 mm)
Maximum Grind 0.010-0.014" (0.25-0.35 mm)
Valve Seats
Intake Valve
Seat Angle 45°
Seat Width 0.055-0.075" (1.40-1.90 mm)
Maximum Seat Runout 0.0012" (0.03 mm)
Seat Diameter 1.275" (32.40 mm)
Exhaust Valve
Seat Angle 45°
Seat Width 0.055-0.075" (1.40-1.90 mm)
Maximum Seat Runout 0.0012" (0.03 mm)
Seat Diameter 1.157" (29.40 mm)
Valve Seat Inserts
Intake
Standard
Insert Diameter 1.3426" (34.100 mm)
Bore Diameter 1.3386" (34.000 mm)
Oversize 1
Insert Diameter 1.3504" (34.300 mm)
Bore Diameter 1.3465" (34.200 mm)
Oversize 2
Insert Diameter 1.3583" (34.500 mm)
Bore Diameter 1.3544" (34.400 mm)
Exhaust
Standard
Insert Diameter 1.2441" (31.600 mm)
Bore Diameter 1.2402" (31.500 mm)
Oversize 1
Insert Diameter 1.2520" (31.800 mm)
Bore Diameter 1.2481" (31.700 mm)
Oversize 2
Insert Diameter 1.2599" (32.000 mm)
Bore Diameter 1.2559" (31.900 mm)
Installing Temperature
Valve Seat Insert -240°F (-150°C)
Cylinder Head 68°F (20°C)
Valve Guides
Valve Guide Bore Diameter(1)
Valve Guide I.D. (Installed)
Standard 0.2362" (6.000 mm)
Oversize 1 0.2401" (6.100 mm)
Oversize 2 0.2440" (6.200 mm)
Valve Guide Installed Height(2) 0.173-0.197" (4.40-5.00 mm)
Valve Stem-To-Guide Oil Clearance (3)
3.2L
Cylinder Head Height
New 5.512" (140.00 mm)
Minimum (1)
Maximum Warpage (1)
Maximum Grind (1)
Valve Seats
Intake Valve
Seat Angle 45°
Seat Width 0.055-0.075" (1.40-1.90 mm)
Maximum Seat Runout (1)
Seat Diameter (1)
Exhaust Valve
Seat Angle 45°
Seat Width 0.055-0.075" (1.40-1.90 mm)
Maximum Seat Runout (1)
Seat Diameter (1)
Valve Seat Inserts (1)
Valve Guides
Valve Guide Bore Diameter (1)
Valve Guide I.D. (Installed)
Standard 0.2362" (6.000 mm)
Oversize 1 0.2401" (6.100 mm)
Oversize 2 0.2440" (6.200 mm)
Valve Guide Installed Height (1)
Valve Stem-To-Guide Oil Clearance (3)
(1) Information is not available from the manufacturer.
(2) Measured from valve guide collar to cylinder head, on camshaft side.
(3) See CYLINDER HEAD under OVERHAUL.
CAMSHAFT

Application In. (mm)
2.8L
Bore Diameter (1)
End Play 0.006-0.013 (0.15-0.33)
Journal Diameter 1.18 (30.00)
Journal Runout (1)
Lobe (Cam) Height 1.8504-1.8528 (47.000-47.060)
Lobe Lift (1)
Oil Clearance 0.0008-0.0021 (0.020-0.054)
3.2L
Bore Diameter (1)
End Play 0.006-0.013 (0.15-0.33)
Journal Diameter (1)
Journal Runout (1)
Lobe (Cam) Height (1)
Lobe Lift (1)
Oil Clearance 0.0008-0.0021 (0.020-0.054)
(1) Information is not available from manufacturer.
VALVE LIFTERS

Application In. (mm)
2.8L & 3.2L
Bore Diameter (1)
Lifter Diameter (1)
Oil Clearance (1)
(1) Information is not available from manufacturer.
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