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Oil Pressure Switch 3841607 – Fits Volvo Penta & OMC 3.0–8.2L
- $43.77
- $43.77
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How to Match This Part
This aftermarket oil pressure light switch replaces Volvo Penta 3841607 (superseded by 3852215) and OMC 0379948. It threads into an oil-gallery boss on Volvo Penta and OMC Cobra sterndrive gasoline engines and signals the oil-pressure warning light or alarm — it is not a variable-resistance gauge sender.
Match this part in this order:
1. OEM number on the removed switch or in your parts catalog (Volvo Penta 3841607 or 3852215, or OMC 0379948)
2. Engine family and displacement — Volvo Penta or OMC Cobra sterndrive gasoline 4-cylinder, V6, or V8 in the 3.0L–8.2L range
3. Thread and terminal — 1/8 NPT male thread with a single male blade (spade) terminal
Identify the form from the product images: zinc-plated hex body, black insulator cap, one male blade terminal, and red thread sealant on the pipe threads. If your original unit has a 10-32 stud instead of a blade, or is a two-terminal gauge sender, it is a different component.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Volvo Penta | 3841607 | Primary reference; superseded by 3852215 |
| OEM | Volvo Penta | 3852215 | Current Volvo Penta switch (also used on OMC catalogs) |
| OEM | OMC Cobra | 0379948 | OMC sterndrive equivalent |
| Aftermarket | Sierra | 18-5894 | Oil pressure light switch replacement |
Part numbers are listed for identification only. This is an aftermarket part manufactured by JLM Marine and is not sold as a genuine Volvo Penta or OMC component.
Compatible Engine Models
Confirm your engine model and original part number before ordering. On Volvo Penta sterndrive and inboard gasoline engines, the identification plate and serial number are on the engine itself — typically on the cylinder block or flywheel housing — not on an outboard transom bracket. For OMC Cobra, match the number on the engine identification plate and the removed switch.
| Brand | Application | Displacement | Notes |
|---|---|---|---|
| Volvo Penta | Sterndrive / outdrive gasoline engines calling for 3841607 or 3852215 | 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L | 4-cyl, V6 & V8; warning-light circuit |
| OMC Cobra | Sterndrive / outdrive gasoline engines calling for 0379948 or 3852215 | 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L | 4-cyl, V6 & V8; warning-light circuit |
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Oil pressure light switch (warning / alarm) |
| Primary OEM number | 3841607 |
| Thread | 1/8 NPT male pipe thread |
| Terminal | Single 1/4 in. male blade (spade) |
| Function | Signals the oil-pressure warning light / alarm |
| Form | Zinc-plated hex body, black cap, sealant on threads |
Installation Guide
1
Allow the engine to cool fully. Disconnect the battery negative cable before working on the warning circuit.
2
Pull the warning-light wire off the blade terminal. Unscrew the old switch and compare its thread and terminal to this 1/8 NPT / single-blade unit. Do not force a mismatched thread.
3
Thread the new switch in by hand on the sealed pipe threads, then tighten snugly with the correct wrench on the body hex — do not crush the insulator cap.
4
Push the warning-light connector fully onto the blade. Reconnect the battery, start the engine, and confirm the light or alarm clears as oil pressure builds and that there are no oil leaks at the port.
Note: Professional installation is recommended to ensure safety and optimal performance.
Troubleshooting & FAQ
Why Choose JLM MARINE?
- Precision Fit: Thread and blade-terminal layout matched to Volvo Penta 3841607 / 3852215 oil pressure light switch applications.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: Aftermarket marine parts engineered for reliable warning-system service.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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