978906 Support Washer | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta support washer weighing 0.011 kg and listed for 14 applications across TMD, AD, HS, TAMD, KAD and KAMD engines — the same application set as the shim range and plug carried here, so it belongs to the same assembly. No diameter or thickness is published against it.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD31D
• Volvo Penta TMD41B
• Volvo Penta AD31D
• Volvo Penta AD31D-A
• Volvo Penta AD31XD
• Volvo Penta HS1A
• Volvo Penta HS1E
• Volvo Penta HS1E-A
• Volvo Penta TAMD41B
• Volvo Penta TAMD31M
• Volvo Penta TAMD31D
• Volvo Penta TAMD42B
• Volvo Penta KAD42B
• Volvo Penta KAMD42B

• Engine Family: TMD, AD, HS, TAMD, KAD, KAMD

⚙️ Key Features

• Fits 14 applications across TMD, AD, HS, TAMD, KAD and KAMD engines
• 0.011 kg
• Same application set as the 0.10 to 0.55 mm shim range listed here
• No published dimensions — order by part number

🔌 Function

Backs up a seal or spacer stack, giving a flat load-bearing face so the parts beside it are not distorted as the joint is pulled up.

⚠️ Common Signs of Failure

• Washer found dished, bowed or bruised on strip-down
• Bright fretting marks on either face
• Seal or spacer it supports failing early or repeatedly
• Corrosion or pitting where it seats
• Clearance in the stack drifting out of specification

🛠️ Service Notes

• This washer is not a shim — do not use it to make up thickness in the shim stack; use the graded shims 977913 through 978916 for that
• Renew it whenever the stack is disturbed rather than reusing a washer that has taken a set

📦 Condition

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