Knock Sensor 3854905 – Volvo Penta 4.3/5.0/5.7L Stern Drive

Knock Sensor 3854905 – Volvo Penta 4.3/5.0/5.7L Stern Drive

Vendor: JLM Marine
Availability: In Stock
Product Type: Sensor
$46.99
$46.99
Subtotal: $46.99

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Knock Sensor 3854905 – Volvo Penta 4.3/5.0/5.7L Stern Drive

Knock Sensor 3854905 – Volvo Penta 4.3/5.0/5.7L Stern Drive

$46.99
Descripción

How to Match This Part

This aftermarket knock (detonation) sensor replaces Volvo Penta 3854905 on gasoline stern drive / Out Drive packages. It threads into the engine block, monitors combustion vibration, and signals the control module so ignition timing can be retarded when knock is detected.

Match this part in this order:
1. OEM number on the sensor you are removing or in your parts catalog — 3854905
2. Engine model code and year on the Volvo Penta engine identification plate (see Compatible Engines below)
3. Aftermarket cross — Sierra 18-7679 if that is what your catalog lists

Compare the product images to the part on your engine: cylindrical metal body, single-pin terminal post on top, and a threaded mounting stud with pre-applied sealant on the threads. Confirm the OEM number before ordering — other knock sensors exist for different stern-drive families.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers. 3854905 is the primary Volvo Penta reference for this listing.

Type Brand Part Number Notes
Primary OEM Reference Volvo Penta 3854905 Original equipment knock sensor
Aftermarket Sierra Marine 18-7679 Direct replacement cross

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 component.

Compatible Engines

Confirm your Volvo Penta stern drive / Out Drive model designation and year on the engine identification plate, and that the removed sensor is numbered 3854905 (or Sierra 18-7679). Do not expand beyond the models listed here.

Displacement Engine Model Years
4.3L 4.3L stern drive 1994–2002
5.0L 5.0L Gxi-A 2001–2002
5.7L 5.7L GiL-A 2001
5.7L 5.7Gi-A, 5.7GXi-A, 5.7GXi-B, 5.7GiI-A, 5.7GSiI-A, 5.7GXiI-A, 5.7GXiI-B 2000–2003
5.7L 5.7GLPNCS, 5.7GIPNCACE, 5.7GIPNCSCE, 5.7GIPNCMCE, 5.7GIPNCBCE, 5.7GIINCCCE, 5.7GIINCSCE 1995–1996

Important: This listing covers the gasoline stern-drive packages above. Verify the OEM number on your engine before ordering — other Volvo Penta knock sensors are used on different engine families.

Technical Specifications

Specification Value
Part type Knock / detonation sensor
Primary OEM number 3854905
Engine application Volvo Penta gasoline stern drive / Out Drive, 4.3L / 5.0L / 5.7L
Aftermarket cross Sierra 18-7679
Terminal style Single-pin connector post (no harness supplied)
Mounting Threaded stud with pre-applied thread sealant; screws into the engine block
Function Detects knock / detonation and signals the ECM for timing retard

Installation Guide

1

Disconnect the battery and allow the engine to cool. Locate the existing knock sensor on the block and note harness routing before unplugging.

2

Unscrew the old sensor with a deep socket. Clean the block threads and mounting face so the new sensor can seat metal-to-metal.

3

Compare body shape, stud length, and single-pin terminal to the part you removed and to the product images. Do not add extra sealant, tape, or washers — the stud already carries thread sealant, and the sensor needs direct metal contact to read block vibration.

4

Thread the sensor in by hand, then tighten to the torque specified in your Volvo Penta service manual for this application. Over-tightening can damage the sensing element.

5

Reconnect the harness until fully seated, reconnect the battery, clear any stored knock-sensor codes if present, and confirm normal operation under load.

Note: Professional installation is recommended to ensure safety and optimal performance.

Troubleshooting & FAQ

How do I confirm this fits my engine?+

Start with the number on the sensor you are removing. If it reads 3854905 or Sierra 18-7679, this part is the equivalent. Then confirm your engine model and year appear in the compatibility table, and compare body shape and the single-pin terminal with the product images.

Is this an OEM or aftermarket part?+

This is an aftermarket JLM Marine replacement matched to Volvo Penta 3854905 (and Sierra 18-7679). It is not a genuine Volvo Penta part.

What symptoms point to a failed knock sensor?+

Common signs include reduced power under load, retarded timing behavior, higher fuel use, and stored knock-sensor fault codes. Corrosion on the body or a damaged terminal can also weaken the signal — inspect the harness and grounds before replacing the sensor.

Does this include a wiring harness or gasket?+

No harness or separate gasket is supplied with this listing. Reuse the existing engine harness connector. The mounting stud uses pre-applied thread sealant for sealing in the block.

Why Choose JLM MARINE?

  • Precision Fit: Cross-reference matched to Volvo Penta 3854905 knock-sensor applications on the listed 4.3L / 5.0L / 5.7L stern-drive packages.
  • Quality Control: Each batch is inspected for dimensional consistency and workmanship.
  • Direct from Manufacturer: Aftermarket marine parts engineered for reliable ignition-knock sensing service.
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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.

Estamos entusiasmados de ampliar nuestro alcance a través de canales minoristas, llevando nuestra experiencia y compromiso con la calidad directamente a los propietarios de embarcaciones y entusiastas de todo el mundo.

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