Crankshaft Position Sensor 3858979 – Fits Volvo Penta OMC 4.3–5.7L

Crankshaft Position Sensor 3858979 – Fits Volvo Penta OMC 4.3–5.7L

Vendor: JLM Marine
Availability: In Stock
Product Type: Sensor
$53.77
$53.77
Subtotal: $53.77

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Crankshaft Position Sensor 3858979 – Fits Volvo Penta OMC 4.3–5.7L

Crankshaft Position Sensor 3858979 – Fits Volvo Penta OMC 4.3–5.7L

$53.77
Descripción

How to Match This Part

This aftermarket crankshaft position sensor replaces Volvo Penta / OMC 3858979 (also catalogued for MerCruiser / Quicksilver as 864297T01, including 864297 and 864297001). It mounts at the timing cover and reports crankshaft position and speed to the ECM so ignition timing and fuel delivery stay synchronized on gasoline sterndrive and inboard engines.

Match this part in this order:
1. OEM number on the removed sensor or in your parts catalog — 3858979 (Volvo Penta / OMC) or 864297T01 / 864297 / 864297001 (MerCruiser)
2. Engine brand and displacement — gas OMC / Volvo Penta 4.3L, 5.0L, or 5.7L, or the MerCruiser models listed below
3. Physical form — compare the mounting style, connector, and overall shape with the product images and with the sensor you remove

This sensor is intended for GM-based marine engines that use a composite (plastic) timing cover with a crank-sensor port. If your original sensor carries a different OEM number, or your timing cover has no sensor port, do not use this part even if the displacement matches.

Part Number Cross-Reference

Use these verified numbers to confirm you have the correct crankshaft position sensor. Brand names and OEM numbers are for identification only.

Type Brand Part Number Notes
OEM Volvo Penta / OMC 3858979 Primary reference (crankshaft position sensor)
OEM Mercury MerCruiser / Quicksilver 864297T01 Also catalogued as 864297 and 864297001
OEM Indmar 556293 Interchange OEM number for the same sensor family
Aftermarket Sierra Marine 18-7706 Volvo Penta / OMC replacement listing
Aftermarket Sierra Marine 18-7556 MerCruiser replacement listing for the same sensor family
Aftermarket Mallory Marine 9-29820 Direct cross-reference
Aftermarket CDI Electronics E13-0003 Direct cross-reference

This is an aftermarket part manufactured by JLM Marine. It is not sold as a genuine Volvo Penta, OMC, Mercury, MerCruiser, Quicksilver, or Indmar component.

Compatible Engine Models

Confirm brand, displacement, and the original sensor number before ordering. On Volvo Penta and OMC gasoline engines the identification plate is typically on the block or flywheel housing; on MerCruiser sterndrive and inboard engines it is on the block or near the flame-arrestor cover. Always match the OEM number and physical form of the sensor you remove. MerCruiser owners can also cross-check diagrams at Mercury Parts Diagrams.

Brand Engine Model Notes
Volvo Penta 4.3L, 5.0L, 5.7L gasoline sterndrive Replaces 3858979; composite timing cover
OMC Cobra 4.3L, 5.0L, 5.7L gasoline sterndrive Replaces 3858979; composite timing cover
MerCruiser 4.3L Carb / MPI Replaces 864297T01
MerCruiser 5.0L MPI, 5.7L MPI, 6.2L MPI Replaces 864297T01; composite timing cover
MerCruiser 350 Magnum Replaces 864297T01
MerCruiser 525 EFI Replaces 864297T01

Engines outside this list are not covered by this listing. If your original sensor number differs, confirm compatibility before ordering.

Technical Specifications

Specification Value
Part type Crankshaft position sensor
Primary OEM replaced Volvo Penta / OMC 3858979
Also replaces MerCruiser / Quicksilver 864297T01 (864297 / 864297001)
Engine application Marine gasoline sterndrive and inboard (GM-based V6 / V8)
Mounting location Timing cover crank-sensor port
Timing cover requirement Composite (plastic) timing cover with sensor port — not for metal covers without a port

Installation Guide

  1. 1 Disconnect the battery negative cable and allow the engine to cool before working near the timing cover.
  2. 2 Unplug the harness from the original sensor, then remove the mounting fastener and withdraw the sensor from the timing-cover bore. Note bracket orientation and lead routing before removal.
  3. 3 Compare the new sensor with the old one side by side. Mounting style, connector, and overall shape must match before installation.
  4. 4 Clean the mounting bore and sealing face. Seat the new sensor fully without forcing it, then refit the fastener to the torque in your engine service manual.
  5. 5 Reconnect the harness until the lock clicks. Route the lead clear of belts, pulleys, and hot exhaust components, then reconnect the battery.
  6. 6 Clear any stored crank or timing fault codes with a marine diagnostic tool, start the engine, and confirm a stable idle and correct RPM reading before returning the boat to service.

Note: Professional installation is recommended for EFI crankshaft position sensors.

Troubleshooting & FAQ

How do I confirm this fits my engine? +

Start with the number on your original sensor. If it is Volvo Penta / OMC 3858979 or MerCruiser 864297T01 / 864297 / 864297001, this is the correct replacement family. Then confirm your brand and displacement against the compatibility table and compare the physical form with the product images.

What symptoms point to a failing crankshaft position sensor? +

Common signs include hard starting or no start, intermittent stalling, an erratic or missing tachometer signal, and misfire or crank/timing fault codes. Check the harness and connector for corrosion and confirm the fault with a marine scan tool before replacing the sensor.

Will it fit a metal timing cover? +

No. This listing is for GM-based marine engines with a composite (plastic) timing cover that already has a crank-sensor port. Engines with a metal cover and no sensor port use a different arrangement.

Is this an OEM or aftermarket part? +

This is an aftermarket replacement manufactured by JLM Marine. It is not a genuine Volvo Penta, OMC, or MerCruiser part. OEM and aftermarket numbers are listed only for cross-matching.

Important Notes

  • Match the OEM number and the physical form of your original sensor before ordering. A different connector or mount means a different part.
  • Confirm a composite timing cover with a crank-sensor port. This sensor is not for metal covers without that port.
  • This is an aftermarket part. Brand names and part numbers are for reference only.
  • Professional installation is recommended for EFI crankshaft position sensors.

Why Choose JLM MARINE?

  • Precision Fit: Cross-referenced to Volvo Penta / OMC 3858979 and MerCruiser 864297T01 for the applications listed above.
  • Quality Control: Each batch is inspected for dimensional consistency and workmanship.
  • Direct from Manufacturer: Aftermarket marine sensors engineered for reliable crankshaft-position feedback on gasoline sterndrive EFI systems.
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Acerca de JLM Marine

Fundada en 2002, JLM Marine se ha consolidado como un fabricante dedicado de piezas marinas de alta calidad, con sede en China. Nuestro compromiso con la excelencia en la fabricación nos ha ganado la confianza de las principales marcas marinas a nivel mundial.

Como proveedor directo, evitamos intermediarios, lo que nos permite ofrecer precios competitivos sin comprometer la calidad. Este enfoque no solo promueve la rentabilidad, sino que también garantiza que nuestros clientes reciban el mejor valor directamente del proveedor.

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