20862028 Plunger | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta control plunger for the oil-cooler and oil-filter housing regulating circuit. The precision-ground plunger moves inside sleeve 20860343 against spring 20860334, opening or closing internal oil passages according to pressure and oil viscosity.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD734GE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD765VE
• Volvo Penta TAD764VE
• Volvo Penta TAD763VE
• Volvo Penta TAD762VE
• Volvo Penta TAD761VE

• Engine Family: TAD

⚙️ Key Features

• Genuine Volvo Penta Oil Cooler / Filter Control Plunger - part number 20862028
• Precision hydraulic plunger for the oil filter/cooler bypass valve
• Matched working diameter and surface finish for sleeve 20860343
• Works with spring 20860334 and insert 20862336
• Controls oil routing during cold starts, high restriction and normal warm operation
• Metering edges must remain sharp and free from scoring
• Install with clean engine oil and keep all lint, abrasive and sealant out of the valve bore
• Engine type: D5/D7-series oil-cooler and oil-filter pressure-control systems

🔌 Function

Oil pressure acts on the plunger area and moves it against the calibrated spring. Its position determines which internal galleries are connected, allowing the lubrication system to protect against excessive restriction while still sending oil through the filter and cooler under normal conditions.

⚠️ Common Signs of Failure

• Plunger seized by sludge, varnish or metal debris
• Scoring or wear produces internal leakage
• Oil pressure remains abnormal after filter replacement
• Filter bypasses continuously or the cooler circuit does not receive flow
• Cold-start oil pressure spikes or delayed lubrication

🛠️ Service Notes

• This plunger is matched to sleeve 20860343 and spring 20860334 — replace all as a set from a worn bore, since a new plunger in a scored sleeve will stick or leak past the metering edges almost immediately
• Keep the valve bore and plunger scrupulously clean during fitting — grit, lint or sealant residue on the metering edges will make the plunger stick partway through its travel, which shows up as poor oil routing during cold starts or under high restriction rather than a simple leak

🔄 Supersession & Cross Reference

Other-Brand OEM Numbers

• VOE20862028

📦 Condition

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