21384459 Six Point Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta Six Point Screw - Part Number: 21384459

Genuine six-point engine screw used in the cylinder-head and valve-cover area of Volvo Penta D4 and D6 marine diesel engines. This later OEM reference replaces screw 3581866 and provides the specified thread engagement and clamping load for the designated assembly position.

⚙️ Key Features

• Genuine Volvo Penta six-point screw

• Used in D4 and D6 cylinder-head or valve-cover assemblies

• Replaces Volvo Penta screw 3581866

• Correct OEM thread, length and strength specification

• Suitable for model generations A through G as listed

• Covers D4 and D6 outputs from 150HP to 480HP

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 21384459 → Supersedes 3581866

• 3581866 - Earlier OEM reference

OEM / Related Numbers:

• 21384459

• 3581866

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• Volvo Penta D4 marine diesel engines

• Volvo Penta D6 marine diesel engines

• Inboard, sterndrive and waterjet engine configurations

D4 engine models:

• D4-150A-G

• D4-175I-G

• D4-180I-B/C/D/E/F

• D4-210A-A/B

• D4-210I-A/B

• D4-225A-B/C/D/E/F

• D4-225I-B/C/D/E/F

• D4-230A-G

• D4-230I-G

• D4-260A-A/B/C/D/E/F

• D4-260D-B/C/D/E/F

• D4-260I-A/B/C/D/E/F

• D4-270A-G

• D4-270I-G

• D4-300A-A/C/D/E/F/G

• D4-300D-A/C/D/E/F

• D4-300I-A/C/D/E/F/G

• D4-320A-G

• D4-320I-G

D6 engine models:

• D6-280A-A/B/C/D/E

• D6-280I-A/B/C/D/E

• D6-300A-F/G

• D6-300D-F/G

• D6-300I-F/G

• D6-310A-A/B/C/D/E

• D6-310D-B/C/D/E

• D6-310I-A/B/C/D/E

• D6-330A-B/C/D/E/F

• D6-330D-B/C/D/E/F

• D6-330I-B/C/D/E/F

• D6-340A-G

• D6-340D-G

• D6-340I-G

• D6-350A-A/B

• D6-370A-B/C/D/E/F

• D6-370D-A/B/C/D/E/F

• D6-370I-A/B/C/D/E/F

• D6-380A-G

• D6-380D-G

• D6-380I-G

• D6-400A-E/F/G

• D6-435D-A/C/D/E/F

• D6-435I-A/C/D/E/F

• D6-440A-G

• D6-440D-G

• D6-440I-G

• D6-440I-WJ-G

• D6-480D-G

• D6-480I-G

• D6-480I-WJ-G

• HP range: 150HP-480HP

• Engine type: D4 four-cylinder and D6 six-cylinder common-rail marine diesel

• Model-generation coverage: A through G as individually listed

🔌 Function

The screw secures the designated cylinder-head or valve-cover component while maintaining the required clamping force and alignment. Using the correct OEM fastener helps prevent thread damage, component distortion and leakage.

Common signs that replacement is required:

• Rounded six-point head

• Damaged threads

• Corrosion or pitting

• Fastener stretching

• Inability to achieve specified torque

• Oil seepage caused by insufficient clamping at the attached component

📦 Condition

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging