20405521 Spring Pin | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta spring pin used in pairs to locate the cylinder head and head gasket accurately on the cylinder block. The pins preserve alignment while the head is lowered into position and the head bolts are tightened.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• Hardened cylinder-head locating dowel / spring pin
• Two used in the applicable cylinder-head assembly
• Aligns the cylinder head and gasket to the block
• Prevents gasket movement during installation
• Must sit at the specified installed height
• Engine type: Volvo Penta four- and six-cylinder industrial diesel
• 2 used per assembly

🔌 Function

Locates the cylinder head and gasket accurately on the block before the head fasteners are tightened.

⚠️ Common Signs of Failure

• Cylinder head difficult to align
• Head gasket shifting during assembly
• Pin corroded, loose or driven below specification
• Distorted or cracked locating pin
• Damage to the cylinder-head or block dowel bore

🛠️ Service Notes

• Support the component solidly and drive the pin straight along its bore with a pin punch of the correct size — a pin started at an angle burrs the bore and locks up
• Check the holes in the two parts line up and the bore is clean and free of burrs before you start
• Fit a new pin rather than reusing one that has been driven out; a spring pin loses its grip once it has been collapsed and expanded
• Drive it to the same depth as the original so it sits flush and cannot foul or catch a moving part
• Where the pin retains a shaft, lever or roller, check the joint moves freely afterwards and that the pin is properly captive

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20405500 - related cylinder head
• 11700335 - 1.4 mm head-gasket grade
• 23178165 - 1.4 mm head-gasket grade
• 11700336 - 1.5 mm head-gasket grade
• 23172474 - 1.5 mm head-gasket grade
• 11700337 - 1.6 mm head-gasket grade
• 23193385 - 1.6 mm head-gasket grade
• 20405886 - related cylinder-head seals

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D7A-B TA, D7A-T, D7A-TA, D7C-B TA, D7C-TA
• Volvo Penta D5A-B TA, D5A-T, D5A-TA
• Volvo Penta MD2010, MD2010B
• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD722GE, TAD722VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD750GE, TAD750VE
• Volvo Penta TD520GE, TD520VE
• Volvo Penta TD720GE, TD720VE PP
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD751GE
• Volvo Penta TAD760VE