Volvo Penta Reduction Valve 21068158 | OEM Oil System Pressure Valve
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Volvo Penta Reduction Valve — Part No. 21068158
Brand: Volvo Penta
Part Number: 21068158
Official Part Name: Reduction Valve
System: Lubrication System / Oil Filter Housing Assembly
Superseded By: 471706 — order 471706 for new installations where available
What This Part Does
This is a genuine OEM pressure-regulation valve that lives inside the oil filter housing assembly. It controls oil pressure within the lubrication circuit, opening to bypass excess pressure and protecting downstream components. When it sticks, wears, or loses its sealing ability, oil pressure readings become unreliable and engine protection is compromised.
When to Replace
- Erratic or low oil pressure readings that don't respond to filter or oil changes
- Valve found stuck open or closed during oil filter housing teardown
- Visible scoring, contamination, or wear on the valve body or bore
- Preventive replacement during oil filter housing rebuild or gasket service
- Any time the housing is apart and the original valve is suspect
Compatible Applications
This part is engine- and serial-number specific. Fitment is confirmed within the oil filter housing / lubrication system schematic for applicable Volvo Penta engine families. Always verify against your exact engine serial number and the correct Volvo Penta parts diagram before ordering.
- Volvo Penta engines using the oil filter housing assembly that references part 21068158 in the lubrication system diagram
- Serial number verification required — fitment varies by production break and housing version
Kit Contents
Single reduction valve (qty 1). Related components in the same housing assembly include the valve spring, piston, plug, and sealing ring — inspect and replace as needed during service.
Dimensions & Weight
- Weight: 0.07 kg (70 g)
- Compact valve body sized for the Volvo Penta oil filter housing bore
Related Parts
- Volvo Penta Oil Filter Housing 11031901
- Volvo Penta Oil Filter Housing 11127830
- Volvo Penta Oil Filter 423135
- Volvo Penta Oil Filter 8692305
- Volvo Penta Oil Filter 4785974
- Volvo Penta O-Ring 861830
Installation Notes
- Keep the valve and housing bore clean during installation — contamination in a pressure-control circuit can cause immediate re-failure
- Inspect the bore, spring, sealing surfaces, and plug before reassembly
- Follow the Volvo Penta service manual for your specific serial-numbered engine
- Torque all housing fasteners to spec
Parts Desk Insights
This is one of those parts that looks simple but has a real impact on engine health. The most common issue we see is customers ordering by part number alone without confirming the housing version — Volvo Penta updated this circuit across production runs, and 21068158 was superseded by 471706. If 471706 is available, that's the preferred order. If you're working from an older diagram or a known-good housing that calls for 21068158, this is the correct OEM valve. Either way, serial number verification before ordering saves a return trip.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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