Denso Starter Motor 12V 11 Tooth CW DXS639

The Denso DXS639 starter motor is a new 12V unit with 11 teeth and clockwise rotation, supplied as a 3-hole mount starter with 127mm mount centres A, 90mm mount centres B, and 90mm mount centres C. It is listed with a 4kW power rating, a 320mm overall length, and a 89mm flange diameter, so it is important to compare those dimensions against the original unit before ordering.

This starter is specified with a 40mm pinion diameter and 48mm pinion at rest, and it uses 12mm mount hole diameter. The note for this unit states Wet Clutch and includes a dowel pin hole in the D.E. housing, which is a useful physical check when matching to the existing application.

Denso lists this as suitable for wet or dry clutch applications, and the unit is identified as a new rotating electrical component with part number DXS639. It also carries a one year warranty, giving buyers a clear reference point when replacing an existing starter motor with the same type and dimensions.

Key Features

• 12V starter motor with clockwise rotation
• 11-tooth pinion arrangement
• 4kW power rating
• 3-hole starter mount type
• Wet or dry clutch suitability listed
• Dowel pin hole in D.E. housing

Specifications

• Brand: Denso
• Product type: Starter motor
• Part number: DXS639
• Voltage: 12V
• Rotation: CW
• Number of teeth: 11
• Power rating: 4kW
• Starter mount type: 3 hole

Fitment guidance

• No verified vehicle fitment is provided here.
• Match the starter by part number DXS639, then confirm the 12V rating, 11-tooth pinion, clockwise rotation, and 3-hole mount layout.
• Check the measured dimensions carefully: 127mm mount centres A, 90mm mount centres B and C, 89mm flange diameter, 12mm mount holes, 320mm overall length, 40mm pinion diameter, and 48mm pinion at rest.
• The note for this unit specifies a wet clutch and a dowel pin hole in the D.E. housing, so those details should be compared with the existing starter and application requirements.
• If the replacement starter differs in any of those physical points, do not rely on the description alone to confirm fitment.

Application and Buying Notes

For a starter motor, the most reliable match is the combination of part number, mounting pattern, rotation, and tooth count. This Denso unit is identified as DXS639, 12V, clockwise rotation, 11 teeth, and a 3-hole mount, so those details should line up with the removed unit before installation is attempted.

The physical measurements matter as much as the electrical rating. The 4kW power rating, 127mm and 90mm mount centres, 89mm flange diameter, 12mm mount hole diameter, and 320mm overall length are the key checks that help avoid ordering a starter that looks similar but does not sit correctly on the engine or bell housing.

The note for wet clutch use and the dowel pin hole in the D.E. housing are also important. Those features may affect how the starter locates on the application, so compare the housing and mounting arrangement carefully against the original part rather than assuming a general Denso starter will be interchangeable.

If you are replacing a starter because of cranking faults, confirm that the issue is not related to wiring, battery condition, earth connections, or the vehicle's charging system. Premium copper terminals and high-voltage tested armature and field coils are listed features of this unit, but correct diagnosis still depends on the rest of the starting circuit being in good condition.

When ordering for a machine or vehicle already fitted with a Denso starter, the safest approach is to cross-check the part number, tooth count, rotation, and mount centres together. That gives you a stronger match than using a single measurement on its own, especially where wet clutch and housing details are involved.

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 DXS639 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 11, Pinion at Rest 48mm, Power Rating 4kW, Suits Unit Make Denso, Note Wet Clutch, Has dowel pin hole in D.E. housing.

Additional published details for cross-checking include New / Reman. New, Wet / Dry Clutch Wet or Dry, Product Group 1 ROTATING ELECTRICAL, Part No. DXS639, Brand DENSO, Description Denso Starter Motor 12V 11Th CW, Flange Diameter 89mm, Mount Centres B 90mm, Mount Hole Diameter 12, Overall Length 320mm.

Denso Starter Motor 12V 11Th CW. Part number DXS639 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 DXS639, 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 compatibility by checking part number DXS639, the 12V clockwise 11-tooth specification, and the listed mounting and housing measurements against the original starter before purchase.

FAQ

What is the part number for this starter motor?

The listed part number is DXS639.

Is this starter motor 12V?

Yes. The voltage is listed as 12V.

How many teeth does the pinion have?

The pinion is listed with 11 teeth.

What rotation does this starter use?

It is listed as clockwise rotation, shown as CW.

Is this a new or remanufactured unit?

It is listed as a new starter motor.

What warranty is listed?

The warranty listed is one year.