185-7104 Aftermarket Onan/Nanni Starter Motor 970312328, ND338 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Onan ND338 Generator Starter Motor - Replaces Part Number: 185-7104

New aftermarket Denso-pattern starter replacing Cummins Onan 185-7104 for Kubota-based marine generator sets. This is the compact ND338-type 12-volt, approximately 0.9kW, 9-tooth clockwise starter.

⚙️ Key Features

• 12-volt electrical system

• Approximately 0.9kW rated output

• Clockwise rotation viewed from the drive end

• 9-tooth pinion

• Compact permanent-magnet gear-reduction construction

• Complete new starter motor with integrated solenoid

• Marine or engine-grade corrosion-resistant construction

• Direct replacement only after voltage, rotation, tooth count and mounting pattern are confirmed

🧰 Kit / Assembly Contents

• 1 × Complete starter motor assembly - P/N 185-7104

• 1 × Integrated starter solenoid and shift mechanism

• 1 × Installed pinion gear and overrunning clutch/Bendix assembly

• 1 × Installed armature, field-magnet/winding, brush holder and drive housing

• Mounting bolts, electrical cables and external relays are transferred or renewed separately unless supplied

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 185-7104 (Cummins Onan OEM reference)

OEM / Related Numbers:

• 185-7104

• Denso 228000-5400

• Denso 228000-5910

• Denso 228000-7090

• Denso 228000-7480

• ND338

Aftermarket / Verified Equivalents:

• Aftermarket ND338 / Denso 228000-series starter

• Recmar-compatible Onan 185-7104 starter

🚤 Compatibility

Commonly used on:

• Cummins Onan marine-generator starting systems

Typically suits:

• Engine / Generator models:

• MDKAA, MDKAB, MDKAL, MDKAV, MDKAW and MDKAZ

• MDKBK, MDKBL, MDKBM and MDKBN

• MDKDK, MDKDL, MDKDM and MDKDN

• HP / Output Range: Generator-output dependent

• Year Range: Generator model and specification dependent

• Starter Identification: Confirm the compact ND338 starter dimensions. Nanni reference 970312328 identifies a different larger starter and must not be substituted on the strength of the number alone.

🔌 Function

The starter motor converts battery electrical energy into high-torque mechanical rotation to crank the engine. When the start circuit energises the solenoid, the pinion moves into the flywheel ring gear and the motor turns the crankshaft until the engine starts. The overrunning clutch then protects the starter as engine speed rises.

Common signs of failure / incorrect starter fitment:

• No-crank condition even though the battery and start-control circuit test correctly

• Solenoid clicks but the starter motor does not rotate

• Starter turns slowly, draws excessive current or overheats the battery cables

• Pinion spins without engaging the flywheel ring gear

• Grinding, clashing or repeated pinion kick-out during cranking

• Intermittent cranking caused by worn brushes, solenoid contacts or heat soak

• Corrosion, water intrusion, burnt windings or excessive shaft/bearing play

📦 Condition

• New aftermarket replacement starter motor

• Brand new

• Supplied in original or equivalent packaging