Delco Remy Starters / Cranking Motors - Electrical Performance specifications:
We give below the Delco Remy Starter Motors / Cranking Motors selection chart based on electrical performance and physical specifications. To see individual starter construction features, service parts and part numbers, please click 50MT / 42MT / 39MT / 38MT / 31MT. This chart should be used in conjunction with the recommended application index while selecting a starter motor.
Current production (delcoremy.com 2024 / 2025 catalogue) Legacy / aftermarket service only — no longer in current catalogue
Current Production Models
| Series | Drive Type | Volts | Peak OutputkW | Peak OutputHP | Engine SizeDiesel, max | Mounting | Weightkg / lb | Key Features | WarrantyUS / Canada |
|---|---|---|---|---|---|---|---|---|---|
| 28MT™ | Gear Reduction | 12 | 2.9 | 3.9 | up to 6.5 L | SAE #1, SAE #3, Pad | 8.4 / 18.5 | Wound field, planetary gear; Positive Shift; Optional Jump-Start Protection (SAE J1493), Wet Clutch |
1 yr / unltd mi |
| 24 | 4.0 | 5.4 | |||||||
| 31MT™ | Gear Reduction | 12 | 2.9 | 3.9 | 12V up to 9.0 L | SAE #1 | 8.4 / 18.5 | Wound field, planetary gear; Positive Shift Engagement; School-bus-rated variant | 1 yr / unltd mi 2 yr — School Bus |
| 35MT™ | Gear Reduction | 12 | 4.3 | 5.8 | 12V up to 9.0 L | SAE #1, SAE #3 | 10.0 / 22.0 | Wound field, planetary gear; Electrical Soft-Start | 1 yr / unltd mi |
| 37MT™ | Straight Drive | 12 | 4.6 | 6.2 | up to 9.0 L | SAE #1, SAE #3 | 22.7 / 50.0 | Wound field, straight drive; Rotatable drive housing; CW / CCW rotation; Optional Jump-Start Protection |
1 yr / unltd mi |
| 24 | 7.0 | 9.4 | |||||||
| 38MT™ | Gear Reduction | 12 | 4.3 | 5.8 | 12V up to 10.0 L | SAE #1, SAE #3 | 10.0 / 22.0 | Wound field, planetary gear; Electrical Soft-Start; Overrunning clutch; Optional Over-Crank Protection |
1 yr / unltd mi |
| 24 | 7.8 | 10.5 | 24V up to 12.0 L | ||||||
| 38MT+™ | Gear Reduction | 12 | 4.3 | 5.8 | up to 13.0 L | SAE #3 | 12.9 / 28.4 | Wound field, planetary gear; Electrical Soft-Start; Integrated Over-Crank Protection |
1 yr / unltd mi (non-OCP) 3 yr / unltd mi (OCP) |
| 39MT™ | Gear Reduction | 12 | 7.3 | 9.8 | 12V up to 15.0 L | 12V: SAE #1, SAE #3 24V: SAE #3 |
14.0 / 30.8 | Wound field, planetary gear; Electrical Soft-Start; Overrunning clutch; Optional Rotatable Flange, OCP, JSP |
3 yr / unltd mi (All-Makes) 1 yr / unltd mi |
| 24 | 9.0 | 12.1 | 24V up to 16.0 L | SAE #3 | |||||
| 41MT™ | Straight Drive | 12 | 5.0 | 6.7 | 12V up to 9.8 L | SAE #1, SAE #3 | 22.7 / 50.0 | Wound field, straight drive; 2-piece rotatable housing (12 or 24 positions); Positive engagement, rubber shock absorber; Optional JSP, OCP |
1 yr / unltd mi |
| 24 | 7.0 | 9.4 | 24V up to 12.0 L | ||||||
| 42MT™ | Straight Drive | 12 | 7.3 | 9.8 | 12V up to 14.8 L | SAE #1, SAE #3 | 26.3 / 58.0 | Wound field, straight drive; 2-piece rotatable housing (12 or 24 positions); CW / CCW rotation; Positive engagement, rubber shock absorber; Optional JSP, OCP |
1 yr / unltd mi |
| 24 | 8.0 | 10.7 | 24V up to 16.0 L | ||||||
| 50MT™ | Straight Drive | 12 | 8.5 | 11.4 | up to 29.5 L | SAE #3 | 35.8 / 79.0 | Wound field, straight drive; Rotatable drive housing; CW / CCW rotation; Positive engagement, rubber shock absorber; Tandem-mount capable; Optional Jump-Start Protection |
1 yr / unltd mi |
| 24 | 9.0 | 12.1 | |||||||
| 32 | 13.0 | 17.4 | |||||||
| 64 | 12.0 | 16.1 | |||||||
| 150MT™ | Gear Reduction | 12 | 7.3 | 9.8 | 12V up to 16.0 L | 12V: SAE #1, SAE #3 24V: SAE #3 |
14.4 / 31.8 | Wound field, planetary gear; Electrical Soft-Start; Overrunning clutch; Over-Crank Protection; Customer-specific mounting available |
4 yr / unltd mi |
| 24 | 9.0 | 12.1 | 24V up to 18.0 L | SAE #3 |
Abbreviations — GR Gear Reduction starter (planetary gear motor — lighter, higher torque-to-weight) · SD Straight Drive starter (direct motor-to-pinion — heavier, simpler, proven design) · JSP Jump-Start Protection (meets SAE J1493) · OCP Over-Crank Protection (thermal cut-out preventing damage from excessive cranking) · IMSS Integrated Magnetic Switch / Soft-Start · SAE #1 / #3 SAE J537 mounting flange specifications · CW / CCW Clockwise / Counter-Clockwise rotation viewed from pinion end · MOD 3 Metric module-3 pinion teeth (vs. imperial pitch). HP figures calculated from kW (1 kW = 1.341 HP) for reference; Delco Remy publishes kW only.
Legacy Models — Aftermarket / Service Only
The series below were Delco Remy / Delco Remy America (DRA) production at various points but are no longer in the current PHINIA / Delco Remy catalogue. They remain widely installed in the field and replacement is generally by cross-reference to a current model. Common cross-references are indicated below.
| Series | Drive Type | Typical Voltage | Typical Output | Era | Current Cross-Reference |
|---|---|---|---|---|---|
| 10MT | Straight Drive | 12 V | 1.4 – 1.7 kW | Light-duty, pre-2000s | No direct replacement — consult OE |
| 27MT | Straight Drive | 12 / 24 V | 2.7 – 3.2 kW | Medium-duty, pre-2000s | 28MT or 31MT |
| 29MT | Gear Reduction | 12 / 24 V | 4.0 kW (24 V) | 1990s – 2000s | 31MT or 38MT |
| 30MT | Straight Drive | 12 / 24 V | 4.0 – 5.0 kW | 1980s – 1990s | 37MT or 41MT |
| 36MT | Straight Drive | 12 / 24 V | 4.0 – 5.0 kW | 1990s | 37MT or 41MT |
| 40MT | Straight Drive | 12 / 24 V | ~7.0 kW | 1980s – 1990s | 39MT or 42MT |
| 45MT | Straight Drive | 24 / 32 V | ~9.0 kW | Heavy-duty legacy | 50MT |
Output figures for legacy models are indicative and vary by part-number variant within each series. Cross-references shown are typical PHINIA replacement recommendations; the specific replacement depends on engine application, mounting, pinion configuration and rotation. For exact replacement selection please contact us with the original Delco Remy part number from the unit nameplate.
* All electrical and physical data above is sourced from delcoremy.com Find-by-Model-Family pages and current PHINIA product literature. Specifications are subject to change without notice; please confirm against current OE spec codes when ordering.
