20859646 Compression Spring | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Exhaust Valve Compression Spring - Part Number: 20859646

A genuine Volvo Penta exhaust-valve spring for the D5/D7 cylinder head. The spring is manufactured to the specified free length, coil geometry and load curve required to close the exhaust valve positively against combustion pressure while following the cam profile throughout the engine speed range.

Correct selection must be confirmed against the complete Volvo Penta product designation, product number and serial number because neighbouring engine variants can use different dimensions, connections, calibration or serial-controlled revisions.

⚙️ Key Features

• Genuine Volvo Penta Exhaust Valve Compression Spring - part number 20859646

• Engine-specific exhaust-valve spring for the Volvo Penta cylinder head

• Calibrated spring rate and installed load maintain valve-to-cam contact

• Controls the heavier thermal and pressure duty of the exhaust valve

• Resists surge, coil resonance and loss of control at governed engine speed

• Must be checked with the correct retainers, valve, guide and installed height

• Replace any spring that is cracked, heat-discoloured, out of square or below the service-load specification

• Confirm the complete engine product number and serial number before ordering

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 20859646 (current OEM reference)

OEM / Related Numbers:

• 20859646

• VOE20859646

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• D5/D7-series industrial and generator diesel cylinder heads

Typically suits:

• Engine models:

• TAD560VE

• TAD561VE

• TAD734GE

• TAD752GE

• TAD753GE

• TAD754GE

• TAD761VE

• TAD762VE

• TAD763VE

• TAD764VE

• TAD765VE

• HP Range: Confirm by exact engine designation and serial number

• Engine Type: D5/D7-series industrial and generator diesel cylinder heads

• Year / Serial Range: Production period and serial breaks vary by model

• Application Note: Exhaust-valve spring; confirm valve-train version and quantity from the engine serial-number parts catalogue.

🔌 Function

The spring returns the exhaust valve to its seat after the rocker arm releases it and keeps the valve train in continuous contact with the camshaft. Correct spring force is essential for compression sealing, valve timing and preventing valve float or contact between moving valve-train components.

Common signs of failure:

• Exhaust valve does not close fully or compression is reduced

• Valve-train clatter, misfire or loss of power at higher speed

• Broken coil or visible heat discolouration

• Free length or spring load below service specification

• Valve float leading to rocker, valve or piston damage

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging