Description

Volvo Penta 21068158 is a genuine OEM reduction valve used in Volvo Penta lubrication-system applications. Volvo Penta’s official parts shop identifies part 21068158 simply as “reduction valve,” and current parts references place it in an oil filter housing / lubricating system style assembly rather than as a general-purpose valve.

Key Features

• Genuine Volvo Penta OEM part number 21068158.
• Official Volvo Penta description: reduction valve.
• Current assembly references place it in an oil filter housing schematic, where it appears alongside related spring, piston, plug, and sealing components typical of a pressure-regulation circuit.
• Current parts sources also show 21068158 as superseded by 471706.
• One current source lists approximate part weight at 0.07 kg.

Engine Compatibility
Current public references tie Volvo Penta 21068158 to a lubricating system / oil filter housing application, but the available source snippets do not establish a single clean public fitment list by engine family. Because pressure-control valve usage can vary by engine series, oil filter housing version, and production break, fitment should be treated as engine- and serial-specific rather than assumed across all Volvo Penta models.

Serial Number Fitment Notice
Always confirm 21068158 against the exact engine serial number and the correct Volvo Penta parts diagram before ordering. Volvo Penta’s parts shop specifically directs customers to identify the exact engine, shield, or drive when locating the correct spare parts.

When This Part Needs Replacement
Replace this reduction valve when the related lubrication circuit shows signs of incorrect oil-pressure regulation, sticking, contamination, wear, internal scoring, or damage found during teardown or diagnosis. It is also a sensible replacement anytime the surrounding oil filter housing or valve assembly is apart and the original valve no longer moves or seals as intended. This usage guidance is based on the part’s placement in lubrication-system and oil-filter-housing references.

Installation Notes
Install only in the correct matched Volvo Penta application. Inspect the housing bore, spring, sealing surfaces, plugs, and related components before reassembly, and follow the correct Volvo Penta service information for the serial-numbered engine. Pressure-control parts should be kept clean during installation to help maintain reliable oil-system operation. The cleanliness point is a practical service inference based on the identified lubrication-system role.

Alternate/Superseded Part Numbers
Current sources reviewed show Volvo Penta 21068158 replaced by 471706.

Parts Desk Insight
With lubrication-system valves, the important check is not just the part number description but the exact housing and engine version it belongs to. Small pressure-control components can look simple, but they directly affect oil-system behavior, so serial-number verification is the safest way to avoid repeat teardown and pressure-related issues after service. This is a practical inference supported by the oil-filter-housing and lubricating-system references for this part.

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