Mahle Starter Motor 12V 10 Tooth CW MS138

The Mahle MS138 starter motor is a 12V unit with 10 teeth and clockwise rotation, designed as a new starter motor for rotating electrical applications. It is listed with a 4.2kW power rating, a 3 hole starter mount type, and reduction gear transmission type, so it is important to compare the mounting pattern and drive setup carefully before purchase.

Key physical checks on this unit include 127mm mount centres A, 90mm mount centres C, a 89mm flange diameter, and an overall length of 320mm. The pinion at rest measures 27mm, the pinion diameter is 39.5mm, and the mount hole diameter is 11mm, which makes matching the existing starter dimensions a practical part of the identification process.

This starter is identified as Mahle part number MS138 and is supplied new, not remanufactured. It is a dry clutch unit, weighs 10.75kg, and carries a one year warranty. The listed description is Mahle Starter Motor 12V 10Th CW, so the electrical specification and rotation direction should be matched to the vehicle application before fitting.

Key Features

• 12V Mahle starter motor
• 10 tooth pinion
• Clockwise rotation
• 4.2kW power rating
• New unit
• 3 hole starter mount type

Specifications

• Voltage: 12V
• Power rating: 4.2kW
• Number of teeth: 10
• Rotation: CW
• Starter mount type: 3 hole
• Transmission type: with reduction gear
• Mount centres A: 127mm
• Mount centres C: 90mm

Application Guidance

• Known fitment families include CASE, CASE IH, Landini, McCormick, New Holland, and Steyr applications.
• Sample application listings include CASE 121E, CASE 21E, CASE 221E, CASE 321, CASE 420, CASE 420CT, CASE 430, CASE 435, CASE 445, CASE 445CT, CASE 450, CASE CT420, CASE SR200, CASE SR220, CASE SR250, CASE SV250, CASE SV300, and CASE TR270.
• Other listed application groups include Landini Landpower, Landini Powermaster, Landini Series 7, McCormick CX Series, McCormick MTX Series, McCormick X6, New Holland T6, New Holland T6000, New Holland T7, New Holland T7000, Steyr CVT, and Steyr Profi.
• Some fitment data is provided as model families and sample year references only, so the exact vehicle should still be checked against the existing starter and part number MS138 before ordering.

Application and Buying Notes

Before buying, compare the existing starter against the key identifiers here: Mahle MS138, 12V, 10 tooth, clockwise rotation, 4.2kW, and 3 hole mount. These details are the most useful first checks because a starter can look similar externally while differing in rotation, tooth count, flange size, or mounting pattern.

The mounting measurements matter as much as the electrical rating. This unit is listed with 127mm mount centres A, 90mm mount centres C, 90mm mount centres B, and an 89mm flange diameter, so the safest approach is to confirm those dimensions against the removed starter or the vehicle specification before purchase.

The drive end also needs attention. The pinion at rest is 27mm, the pinion diameter is 39.5mm, and the tooth pitch is 15.42, which are useful cross-checks when matching a replacement starter to the original unit. If the application is for a machine with reduction gear starting equipment, make sure the existing starter follows the same arrangement.

This is a new Mahle starter motor and it is supplied as a dry clutch unit. If your current starter has been repaired, remanufactured, or altered, the visible condition alone should not be used as the deciding factor. Part number MS138 and the full mounting data should carry more weight than appearance.

The listed application families cover several CASE, CASE IH, Landini, McCormick, New Holland, and Steyr machines, but the data provided still includes family and sample model references rather than a complete model-by-model register. That means the final check should always be against the removed part, the machine build details, and the mount dimensions.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number MS138 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type STARTER MOTOR, Unit of Measure EACH, Warranty One Year, Mount Centres A 127mm, Mount Centres C 90mm, Number of Teeth 10, Pinion at Rest 27mm, Power Rating 4.2kW, Suits Unit Make Mahle, New / Reman. New.

Additional published details for cross-checking include Wet / Dry Clutch Dry, Bore O 1 10.9, Tooth Pitch 15.42, Connecting Angle [Degree] 45.0, Packaging length 38.2, Packaging height 14.50, Weight 10.75kg, Product Group 1 ROTATING ELECTRICAL, Part No. MS138, Brand MAHLE.

Mahle Starter Motor 12V 10Th CW. Part number MS138 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number MS138, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using part number MS138, the 12V clockwise 10 tooth specification, and the mounting measurements before ordering. Application references are helpful, but the final decision should be based on the existing starter and the vehicle or machine’s exact starter arrangement.

FAQ

What is the part number for this starter motor?

The listed part number is MS138.

Is this starter motor 12V or 24V?

It is listed as 12V.

What direction does it rotate?

The rotation is clockwise, shown as CW.

How many teeth does the pinion have?

It has 10 teeth.

Is this a new or remanufactured unit?

It is listed as new.

What warranty is provided?

The warranty listed is one year.