Skip to product information
SKU:
ZZ3F09050
Same day shipping if ordered by 4PM CST.
Neutral Switch Shift 8M0052939 Fit Mercury CMD QSD 2.8 ES 170 210 220 230
$101.19
In Stock
$101.19
Sale price
$101.19
Regular price
Part Number(s)
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
Neutral Switch Shift for Mercury CMD QSD 2.8 ES 170, 210, 220, and 230
This neutral switch shift 8M0052939 for Mercury CMD QSD 2.8 ES 170, 210, 220, and 230 is an electrical safety component that prevents engine start unless the transmission is in neutral. It also provides shift position feedback to the engine control module for reliable gear changes, referencing OEM cross-reference 8M0052939.
Overview
This neutral switch shift for Mercury CMD QSD 2.8 ES 170, 210, 220, and 230 ensures the engine cannot be started while in gear, protecting both the operator and the drivetrain. It is a direct replacement part for these specific diesel inboard engines. This neutral switch shift is essential for maintaining safe and dependable vessel operation.
Built For Performance
- Interrupts the starter circuit unless the gear shift is in neutral.
- Sends a precise signal to the engine control unit for smooth gear engagement.
- Built with a rugged, waterproof housing for long service life in engine compartments.
- Terminals are gold-plated to resist corrosion and maintain signal integrity.
- Meets OEM specifications for the Mercury CMD QSD 2.8 engine series.
Fits These Machines
- for Mercury CMD QSD 2.8 ES 170
- for Mercury CMD QSD 2.8 ES 210
- for Mercury CMD QSD 2.8 ES 220
- for Mercury CMD QSD 2.8 ES 230
On-The-Job Use
- During pre-departure engine checks, verifying neutral start functionality.
- When maneuvering in tight marinas, ensuring shifting is responsive and safe.
- During electrical system diagnostics for intermittent starting problems.
Specs At A Glance
| Part Number(s) | 8M0052939 |
| Type | Neutral Safety Switch |
| Compatible Brand | for Mercury CMD |
| Engine Series | QSD 2.8 ES 170, 210, 220, 230 |
Good To Know
Q: What happens if this switch fails? A: The engine may not start at all, or it could start while in gear, which is a serious safety hazard. Replacing it with this compatible part restores safe operation.
Q: Can I install this switch myself? A: Installation is straightforward for someone with basic mechanical skills, involving disconnecting the battery, removing the old switch, and connecting the new one. Always consult the engine service manual for specific guidance.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.