20798548 Lock Washer | Genuine Volvo Penta Part

🔧 Product Description

Genuine service component used in the common-rail d5/d7 piston and connecting-rod assembly. It restores the original Volvo Penta dimensions, fit and operating relationship.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD750VE
• Volvo Penta TAD760VE

• Engine Family: TAD
• HP Range: Approximately 300 HP
• Year Range: Approximately 2000s-2010s

⚙️ Key Features

• Lock washer from the common-rail D5 and D7 piston and connecting-rod assembly
• Published weight 0.86 kg, which is high for a washer - confirm the item against the parts list for your piston and connecting-rod before ordering
• 2 applications across TAD-series engines
• Engine group

🔌 Function

Locks the fastener it sits under in the piston and connecting-rod assembly, holding clamp load against the reversing loads of the bottom end.

⚠️ Common Signs of Failure

• A knock from the bottom end, heaviest under load
• Metal flake found in the oil or on the filter element
• Fastener found backed off on strip-down
• Washer found flattened, with its locking tangs or lugs broken
• Fretting or witness marks on the mating face where the joint has been moving

🛠️ Service Notes

• Treat as single-use - fit a new lock washer whenever the joint is disturbed
• Bottom-end fasteners are often single-use as well, so check the workshop manual before reusing anything from this joint
• Its published weight is unusually high for a washer, so check the part against parts list for your engine rather than ordering on description alone

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20798025 connecting rod
• 20798843 piston pin
• 20799647 small-end piston bushing
• 20850096 and 20850097 big-end bearing kits
• 20799587 connecting-rod flange screws
• 3884641 piston and cylinder-liner kit
• 20799069 piston-ring set
• 21119635 piston-pin snap ring

📦 Condition

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