# 893891 66015T1 Mercury Starter Motor | Genuine Used Part

🔧 Product Description

  

Genuine Mercury / Mariner Starter Motor - Part Numbers: 893891 / 66015T1

  

A genuine Mercury / Mariner starter motor used on 3-cylinder and 4-cylinder two-stroke outboards. This 10-tooth starter family is commonly used on 65 Jet, 75HP, 80HP, 90HP, 100HP, 115HP and 125HP engines depending on tooth count and starter diagram.

  

⚙️ Key Features

  

• Genuine Mercury / Mariner starter motor

• Correct OEM references 893891 and 66015T1

• 10-tooth starter drive family

• Used on 3-cylinder and 4-cylinder two-stroke outboards

• Cross-references with ARCO and Sierra starter replacements

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 50-893891T later Mercury starter motor reference

• 50-66015T1 related Mercury starter motor reference

• 50-66015 related Mercury starter reference

• 50-65436 related Mercury starter reference

• 50-60315 related earlier Mercury starter reference

  

OEM / Related Numbers:

  

• 893891

• 50-893891

• 50-893891T

• 66015T1

• 50-66015T1

• 66015-2

• 66015

• 50-66015

• 65436

• 50-65436

• 60315

• 50-60315

  

Aftermarket / Verified Equivalents:

  

• ARCO: 5375

• Sierra: 18-5604

• API Marine: MOT3002N

• Aftermarket reference: 50-893891T / 50-66015T1

  

🚤 Compatibility

  

Commonly used on:

  

• Mercury / Mariner 3-cylinder two-stroke starter systems

• Mercury / Mariner 4-cylinder two-stroke starter systems

  

Typically suits:

  

• Engine models:

• Mercury / Mariner 65 Jet 3-cylinder - approximately 1986-1988

• Mercury / Mariner 80HP 3-cylinder - approximately 1986-1988

• Mercury / Mariner 75HP 4-cylinder - approximately 1977-1994

• Mercury / Mariner 80HP 4-cylinder applications using 10-tooth starter family

• Mercury / Mariner 90HP 4-cylinder - approximately 1977-1994

• Mercury / Mariner 100HP 4-cylinder applications where 66015T1 is specified

• Mercury / Mariner 115HP 4-cylinder applications where 66015T1 is specified

• Mercury / Mariner 125HP 4-cylinder applications where 66015T1 is specified

  

• HP Range: commonly 65 Jet and 75HP - 125HP

• Engine Type: Mercury / Mariner 3-cylinder and 4-cylinder two-stroke outboard

• Year Range: approximately 1977-1994 for core 10-tooth applications, with later service replacement use where listed

• Starter Type: 12V, 10-tooth starter motor family

  

🔌 Function

  

The starter motor engages the flywheel ring gear and cranks the outboard during electric starting.

  

Common signs of failure:

  

• Starter clicks but does not crank

• Slow crank with good battery voltage

• Starter spins without flywheel engagement

• Grinding at the flywheel

• Intermittent starting after heat or vibration

• Worn brushes, bushings, armature or starter drive gear

  

📦 Condition

  

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated

## Details

- **Price:** 100.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Tags:** Sawley’s AAM Used Parts – Starter Motors | Marine Starter Motors & Cranking Systems

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 100.00 AUD | In stock |

## Images

- 893891 66015T1 Mercury Starter Motor | Genuine Used Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/893891-66015t1-mercury-starter-motor-genuine-used-part)
> Updated: 2026-07-06