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Oil Pressure Switch 84-817219 – MerCruiser Sterndrive
- $43.77
- $43.77
- Unit price
- per
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How to Match This Part
This aftermarket oil pressure alarm switch replaces MerCruiser / Mercury 84-817219. Mercury later superseded this number through F700602, F708940, and 87-817169 to the current 87-805605A1 switch assembly. It signals the low oil pressure audio warning system on MerCruiser sterndrive and inboard engines.
Match this part in this order:
1. OEM number on the removed switch or in your parts catalog — 84-817219, F700602, F708940, 87-817169, or superseding 87-805605A1
2. Engine family — MerCruiser sterndrive or inboard calling for this oil-pressure alarm switch
3. Thread and terminal — 1/8-27 male pipe thread with a single 10-32 stud terminal
This listing is keyed to legacy number 84-817219. Confirm the OEM number and that you need an alarm switch (not a variable-resistance oil-pressure gauge sender) before ordering. See the product images to compare physical form once media are uploaded.
Part Number Cross-Reference
Use this table to confirm equivalent MerCruiser numbers in the 84-817219 supersession chain and a common aftermarket cross.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| Primary OEM Reference | Mercury / MerCruiser | 84-817219 | Legacy oil pressure alarm switch number |
| OEM supersession | Mercury / MerCruiser | F700602 | Next number after 84-817219 |
| OEM supersession | Mercury / MerCruiser | F708940 | Later catalogue number in the same chain |
| OEM supersession | Mercury / MerCruiser | 87-817169 | Oil pressure alarm switch; superseded by 87-805605A1 |
| OEM supersession | Mercury / MerCruiser / Quicksilver | 87-805605A1 | Current superseding switch assembly number (also 805605A1) |
| Aftermarket | Sierra | OP22900 | Aftermarket cross for superseding Mercury 87-805605A1 |
Part numbers are listed for identification only. This is an aftermarket part manufactured by JLM Marine and is not sold as a genuine Mercury or MerCruiser component.
Compatible Engine Models
Confirm your engine model and serial number before ordering. On MerCruiser sterndrive and inboard engines, the identification plate and serial number are on the engine itself — typically on the cylinder block or flame-arrestor cover — not on an outboard transom bracket. Cross-check with the Mercury Parts Diagrams for your MerCruiser engine group.
This switch serves the low oil pressure audio warning circuit. It is not the variable-resistance sender that drives an oil pressure gauge.
| Brand | Application | Notes |
|---|---|---|
| MerCruiser | Sterndrive engines calling for 84-817219 or its Mercury supersessions | Audio warning system signal |
| MerCruiser | Inboard engines calling for 84-817219 or its Mercury supersessions | Audio warning system signal |
Important: Verify the OEM number on your removed switch or parts catalog. Engines that use a different oil-pressure switch or a gauge sender only should not use this listing.
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Low oil pressure switch (audio warning) |
| Primary OEM number | 84-817219 |
| Current Mercury supersession | 87-805605A1 (805605A1) |
| Thread size | 1/8-27 male pipe thread |
| Terminal type | 10-32 threaded stud, single terminal |
| Function | Signals the engine audio warning system on low oil pressure |
Installation Guide
1
Allow the engine to cool fully. Disconnect the battery negative cable before working on the warning circuit.
2
Label and remove the warning-system wire from the old switch stud. Unscrew the old switch and compare its thread and terminal to this 1/8-27 / 10-32 unit. Do not force a mismatched thread.
3
Thread the new switch in by hand, then tighten snugly with the correct wrench on the body hex — do not over-torque or crush the insulator.
4
Reconnect the warning wire under the 10-32 stud nut. Reconnect the battery, start the engine, and confirm the alarm clears as oil pressure builds and that there are no oil leaks at the port.
Note: If you are unsure about warning-system wiring or oil-gallery location, have a marine technician complete the install.
Troubleshooting & FAQ
Why Choose JLM MARINE?
- Precision Fit: Thread and terminal layout matched to MerCruiser 84-817219 oil pressure alarm switch applications and its verified supersession path.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine parts engineered for reliable warning-system service.
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