859679 Piston | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta piston from the Lubricating and Oil System group, listed for 9 applications across the TMD, MS, TAMD and MD series.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD22A
• Volvo Penta TMD22B
• Volvo Penta TMD22P-C
• Volvo Penta MS2B-A
• Volvo Penta TAMD22P-B
• Volvo Penta MD22
• Volvo Penta MD22A
• Volvo Penta MD22L
• Volvo Penta MD22P

• Engine Family: TMD, MS, TAMD, MD

⚙️ Key Features

• 9 applications across the TMD, MS, TAMD and MD series
• Lubricating and Oil System group
• Spring 859680 is the matching item on the same 9 applications

🔌 Function

Slides in its bore against spring pressure as oil pressure rises, opening a bypass path to hold the circuit pressure at its set value.

⚠️ Common Signs of Failure

• Oil pressure higher than normal when cold and slow to settle
• Oil pressure low or fluctuating with hot oil at idle
• Piston sticking in its bore, or found seized on strip-down
• Bore or piston skirt scored, or debris trapped behind the piston
• Warning light flickering at low revolutions

🛠️ Service Notes

• Renew the spring 859680 at the same time — a tired spring gives the same symptoms as a sticking piston
• Clean the bore and check the piston slides freely under its own weight before reassembly

📦 Condition

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