20709930 Washer | Genuine Volvo Penta Part

🔧 Product Description

A genuine service washer used in a Volvo Penta mounting or adjustment stack. It replaces earlier washer references 20405523 and 960144 and must be fitted in the exact position shown in the applicable engine arrangement.

⚙️ Key Features

• Current washer reference replacing 20405523 and 960144
• Bearing face distributes fastener load across the adjoining component
• Thickness and outside diameter maintain the specified hardware stack
• Surface finish is suitable for engine vibration and corrosion exposure
• Must not be replaced by a generic washer of unknown hardness or thickness
• Confirm position and quantity by serial-specific schematic

🔌 Function

Distributes clamping load and maintains the specified spacing in the associated fastener stack.

⚠️ Common Signs of Failure

• The washer is cupped, cracked or corroded
• The bearing surface is fretted or worn
• The fastener pulls into the adjoining component
• The assembled spacing becomes incorrect
• Replacement is required after deformation or incorrect installation

🛠️ Service Notes

• Check you are fitting the same type of washer that came out — plain, hardened, sealing and locking washers are not interchangeable, and the wrong one either fails to seal or fails to hold
• Treat sealing washers on fuel, oil and coolant unions as single-use; they seal by deforming onto the faces, so a used one will not seal reliably a second time
• Clean the seating faces and make sure the washer sits flat and square, fully under the head or nut, before tightening — a washer trapped on a chamfer or edge will crush unevenly
• Tighten the fastener to the figure given in the workshop manual for your engine, and account for every washer on reassembly so none is left loose inside a housing or the engine bay

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20709930 → Supersedes 20405523

OEM / Related Numbers

• 20405523 earlier number superseded by this part
• 20709931 - Screw in the associated hardware group
• 20709932 - Spacer in the associated hardware group
• 20709933 - Nut in the associated hardware group

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging