858332 Valve Seat | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta valve seat in the 0.20 mm oversize, weighing 0.018 kg and listed for 20 applications across TAMD, AD, D, TMD, KAD and KAMD series engines. It is the repair size for a head whose counterbore has been machined out; the standard size is 858331. Weight is no guide within this graded set - order by the size marking and the measured counterbore.

🚤 Compatibility

Typically suits:

• Volvo Penta TAMD42WJ-A
• Volvo Penta AD41B
• Volvo Penta D41B
• Volvo Penta TMD41A
• Volvo Penta TMD41B
• Volvo Penta AD41A
• Volvo Penta TAMD41B
• Volvo Penta TAMD41A
• Volvo Penta TAMD42B
• Volvo Penta KAD32P
• Volvo Penta KAD42A
• Volvo Penta KAD42B
• Volvo Penta KAD42P-A
• Volvo Penta KAD43P-A
• Volvo Penta KAMD43P
• Volvo Penta KAMD43P-A
• Volvo Penta KAMD42A
• Volvo Penta KAMD42B
• Volvo Penta KAMD42P-A
• Volvo Penta KAMD43P-B

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

⚙️ Key Features

• 0.20 mm oversize
• 0.018 kg
• 20 applications across six engine series
• Standard size equivalent is 858331

🔌 Function

Provides the hardened annular face in the cylinder head that the valve closes against, in an oversize outer diameter for a recut counterbore.

⚠️ Common Signs of Failure

• Compression loss and hard starting on one cylinder
• Blowing or hissing at the valve on a compression test
• Valve clearances closing up between services
• Seat recessed, pitted or cracked on inspection
• Seat found loose after a previous repair

🛠️ Service Notes

• Measure the counterbore before ordering - the oversize only fits a head that has been machined for it
• Order by the size marking rather than the published weight, which does not separate the graded set
• Recut the valve seat angle and check the guide once the new seat is in

📦 Condition

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