Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSBMW2023M4 CSLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 161 (ENGINE - REPAIR)TECHNICAL DATA

2023 BMW M4 CSL

Technical Data

2023 BMW M4 CSLSECTION Technical Data

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2006 BMW 325Ci, 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, and 2004 BMW 325xi. However, it is still accessible from the selected car via links, so may be relevant.

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.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.