20881376 Shim | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta 1.5 mm Injection Pump Calibration Shim - Part Number: 20881376

A genuine Volvo Penta 1.5 mm calibration shim for the unit-injection-pump/tappet installation used on the specified D5/D7 mechanically injected engines. The shim sets the installed height of the pump relative to the cam-driven tappet, making it a precision timing and plunger-stroke component rather than a general packing washer.

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 1.5 mm Injection Pump Calibration Shim - part number 20881376

• Precision thickness: 1.5 mm

• One member of the matched 1.0-3.7 mm injection-pump shim range

• Sets injection-pump installed height and plunger relationship to the tappet

• Ground parallel faces maintain accurate calibration

• Selection is based on the measured setup value for the individual pump position

• Do not choose by appearance or reuse a damaged, burred or corroded shim

• Record each cylinder's shim thickness during disassembly

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

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 20881376 (current OEM reference)

OEM / Related Numbers:

• 20881376

• VOE20881376

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• D5/D7-series mechanically injected industrial diesel engines

Typically suits:

• Engine models:

• TAD520VE

• TAD720VE

• TAD721VE

• TAD722VE

• HP Range: Not a primary selection criterion; match the exact engine/product designation and serial number

• Engine Type: D5/D7-series mechanically injected industrial diesel engines

• Year / Serial Range: Stage 1 and Stage 2 injection-pump arrangements; select by measured installed requirement

• Application Note: Fuel-injection-pump/tappet calibration shim, thickness 1.5 mm; select by measurement, not by engine model alone.

🔌 Function

The shim changes the distance between the injection pump and its cam-driven tappet. This alters the pump's effective installed height and plunger timing relationship, allowing the fuel-injection event to be calibrated to the engine specification. A 0.1 mm thickness change is significant and must only be made from the prescribed measurement procedure.

Common signs of failure:

• Injection timing or pump calibration is outside specification

• Hard starting, uneven idle or excessive diesel knock

• High exhaust smoke or elevated exhaust temperature

• Shim face is fretted, burred or no longer parallel

• Incorrect shim produces inadequate or excessive plunger travel

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging