20551394 Valve Spring Washer | Genuine Volvo Penta Part

🔧 Product Description

This genuine Volvo Penta valve spring washer is an OEM service component used in the Cylinder-Head Valve-Spring Washer / Retainer. It is manufactured to the original Volvo Penta dimensional, material and interface requirements for the documented Volvo Penta 16-litre D16/TAD16 diesel cylinder-head assemblies application. Technical identification: Position-specific upper valve-spring washer/retainer; used at quantity 12 in documented D16/TAD16 cylinder-head assemblies. Shared Volvo application data lists approximately 34.5 mm OD, 12 mm ID and 13.9 mm height.. In service, it locates and retains the valve spring on the valve stem so the specified spring force and installed geometry are maintained. Selection must be confirmed by OEM part number 20551394, the exact model/product number, serial number and installed assembly configuration.

🚤 Compatibility

• Engine Family: TAD, D, TWD

Full model list at the end of this description.

⚙️ Key Features

• Genuine Volvo Penta OEM valve spring washer
• OEM part number 20551394
• Technical distinction: Position-specific upper valve-spring washer/retainer; used at quantity 12 in documented D16/TAD16 cylinder-head assemblies. Shared Volvo application data lists approximately 34.5 mm OD, 12 mm ID and 13.9 mm height.

🔌 Function

Locates and retains the valve spring on the valve stem so the specified spring force and installed geometry are maintained. Inspect all matched valve-train parts, lubricate contact surfaces, set valve recession/clearance where applicable and recheck after initial operation.

⚠️ Common Signs of Failure

• Excessive valve-train ticking or changing valve clearance
• Low compression, misfire or poor starting
• Uneven valve movement or load sharing
• Pitted, cracked, worn or distorted contact surfaces
• Valve, spring or rocker damage caused by incorrect adjustment/retention

🛠️ Service Notes

• Renew as a set when the valve gear is stripped, and keep the parts for each valve together so nothing is mixed between cylinders
• Inspect the seating face for cupping, cracking or a wear step before reassembly and renew rather than reuse anything marked
• Make sure the seat in the head and the face of the washer are clean, with no carbon or swarf trapped underneath
• Fit the correct way up and the correct way round as shown in the workshop manual for your engine, and check the spring and any seal or shroud sit square before the spring is compressed
• Once assembled, check by hand that each valve moves freely and seats fully before the engine is turned over

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 8170995 valve cotter/collet used with the retainer
• 20551396 alternate valve-spring washer used at the other valve position on applicable D16 cylinder heads

Aftermarket / Verified Equivalents

• SRP: VSW-51394

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D16C-A MG, D16C-A MH, D16C-B MH, D16C-C MH, D16C-D MH
• Volvo Penta TAD1640-42GE-B, TAD1640GE, TAD1640VE-B
• Volvo Penta TAD1641VE-B, TAD1641GE, TAD1641VE
• Volvo Penta TAD1642VE-B, TAD1642GE, TAD1642VE
• Volvo Penta TAD1643VE-B, TAD1643VE
• Volvo Penta TAD1650VE-B/51VE, TAD1650GE
• Volvo Penta TAD1651GE
• Volvo Penta TAD1660-62VE
• Volvo Penta TAD1662VE EU5
• Volvo Penta TAD1670-72VE
• Volvo Penta TWD1643GE
• Volvo Penta TWD1652GE
• Volvo Penta TWD1653GE
• Volvo Penta TWD1663GE