Oil Pressure Sender Switch for MerCruiser Sterndrive Applications – Replaces 84-817219, F700602, F708940, 87-817169 and 87-805605A1
Oil Pressure Sender Switch for MerCruiser Sterndrive Applications – Replaces 84-817219, F700602, F708940, 87-817169 and 87-805605A1 is backordered and will ship as soon as it is back in stock.
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Oil Pressure Sender Switch for MerCruiser Sterndrive Applications –...
Oil Pressure Sender Switch for MerCruiser Sterndrive Applications – Replaces 84-817219, F700602, F708940, 87-817169 and 87-805605A1 is backordered and will ship as soon as it is back in stock.
Product Details
This oil pressure sender switch is a replacement component for selected MerCruiser sterndrive applications. It is supplied as a single switch/sensor and is intended to replace the matching original component when the reference number, connector arrangement, thread specification and engine application agree.
The company catalog identifies this product for MerCruiser stern-drive or out-drive equipment and lists the following MerCruiser reference numbers: 84-817219, F700602, F708940, 87-817169 and 87-805605A1.
A marine replacement-parts catalog associates reference number 87-805605A1 with selected MerCruiser applications including 3.0L models from 1990–1995, 4.3L models from 1993–1998, 5.0L models from 1988–2001, 5.7L models from 1988–2001 and 7.4L models from 1991–2000. Always verify the exact engine year, serial range and original sender before ordering.
- Oil pressure sender switch for selected MerCruiser sterndrive applications
- Single replacement component; not a multi-piece kit
- Reference numbers are provided for identification and cross-reference only
- Verify the original part and installation dimensions before purchase
Part Number Matrix
Use the following company-listed reference numbers to compare the replacement with your original component. These numbers should not be treated as interchangeable for every engine without confirming the complete application.
| Brand | Reference Number |
|---|---|
| MerCruiser | 84-817219 |
| MerCruiser | F700602 |
| MerCruiser | F708940 |
| MerCruiser | 87-817169 |
| MerCruiser | 87-805605A1 |
Engine & Model Compatibility
Available catalog evidence connects reference number 87-805605A1 with the applications below. Because marine fitment can vary by model year, serial number, fuel system and engine configuration, confirm the original part number and physical specifications before ordering.
| Engine Application | Cataloged Year Range |
|---|---|
| MerCruiser 3.0L | 1990–1995 |
| MerCruiser 4.3L | 1993–1998 |
| MerCruiser 5.0L | 1988–2001 |
| MerCruiser 5.7L | 1988–2001 |
| MerCruiser 7.4L | 1991–2000 |
Technical Specs
- Product Type
- Oil pressure sender switch
- Application
- Selected MerCruiser stern-drive and out-drive systems
- Configuration
- Single replacement component
- Reference Numbers
- 84-817219, F700602, F708940, 87-817169 and 87-805605A1
Thread size, terminal style, pressure threshold and electrical switching characteristics are not confirmed in the company record for this product. Do not assume the specifications of another oil pressure sender or fuel-pump switch apply to this part.
What's in the Box
- 1 × Oil Pressure Sender Switch
Installation Notes
- Disconnect the battery negative terminal and allow the engine to cool before beginning work.
- Identify the original oil pressure sender and compare its reference number, connector, thread and overall configuration with the replacement.
- Disconnect the wiring from the original sender and protect the wiring from oil contamination or accidental grounding.
- Remove the original sender using the correct wrench and catch any oil released from the port.
- Use only a thread sealant approved for the specific engine application, and do not apply sealant where the service manual requires a clean electrical ground through the threads.
- Install the replacement sender without cross-threading and tighten it according to the engine manufacturer's service instructions.
- Reconnect the wiring and confirm that the connector is secure and correctly routed.
- Start the engine and check for oil leaks and correct warning-system operation. Stop the engine immediately if the oil pressure warning remains active or if a leak is present.
Troubleshooting & FAQ
Will this fit my MerCruiser engine?
This product is listed for selected MerCruiser sterndrive applications. Cataloged applications for reference number 87-805605A1 include certain 3.0L, 4.3L, 5.0L, 5.7L and 7.4L engines within specific year ranges. Verify your engine's exact model, year, serial range and original sender number before ordering.
What does an oil pressure sender switch do?
It provides an electrical oil-pressure signal to the engine's warning or control circuit. The exact switching behavior and circuit function depend on the engine system and the sender specification.
Are all of the listed reference numbers interchangeable?
No. The numbers are company-listed references for this product, but a number appearing in the same product record does not by itself confirm fitment for every engine. Match the complete application and the original component before installation.
Does this product include a wiring connector or installation hardware?
The company record identifies a single switch/sensor. No connector, gasket, adapter, wiring or additional installation hardware is confirmed as included.
What thread size and pressure threshold does it use?
The company record does not confirm a thread size, terminal specification or pressure threshold for this product. Use the engine service information and compare the original component rather than relying on specifications from a different sender.
How can I diagnose a suspected sender problem?
Check the wiring, connector, oil level and engine oil pressure first. A warning signal can result from a faulty sender, damaged wiring or genuinely low oil pressure. Test actual oil pressure with the procedure and equipment specified for your engine before replacing the sender.
Is this an OEM component?
This listing is for a replacement component. The listed reference numbers are provided for application identification; the product should not be represented as a genuine MerCruiser-branded component.
What is included with the purchase?
One oil pressure sender switch is included. Verify the original part and required installation hardware before ordering.
Safety & Important Info
- Confirm the complete engine model, year, serial range and original part number before purchase.
- Do not install the part if the thread, connector or body configuration differs from the original.
- Never operate an engine with confirmed low oil pressure; diagnose the underlying condition before relying on a replacement sender.
- Follow the engine manufacturer's service manual for torque, sealant and electrical-testing procedures.
- Professional installation is recommended when the correct application or oil-pressure condition is uncertain.
About Sea Sierra
- Marine replacement parts selected for common stern-drive and out-drive service applications.
- Product identification support based on listed reference numbers and application information.
- Verify fitment details before installation to help ensure the replacement matches your engine system.
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