20412318 Stud | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta exhaust mounting stud used at four positions on the low-mounted turbocharger installation fitted to TAD530GE and TAD531GE engines. It secures the exhaust flange and must be renewed if the threads have stretched, corroded or seized.

🚤 Compatibility

Typically suits:

• Volvo Penta TD420VE
• Volvo Penta TD520GE
• Volvo Penta TAD550GE
• Volvo Penta TAD551GE
• Volvo Penta TAD560VE
• Volvo Penta TAD561VE
• Volvo Penta TAD420VE
• Volvo Penta TAD520GE
• Volvo Penta TAD520VE
• Volvo Penta TAD530GE MECH
• Volvo Penta TAD530GE EDC4
• Volvo Penta TAD531GE MECH
• Volvo Penta TAD531GE EDC4
• Volvo Penta TAD532GE EDC4

• Engine Family: TD, TAD

⚙️ Key Features

• Four studs used in the applicable turbocharger flange
• Confirmed in the front exhaust-outlet, low-mounted turbo arrangement
• Designed for repeated high-temperature thermal cycling
• Used with hexagon nuts 20517048 and flange 20405607
• Apply the specified installation procedure rather than general-purpose fastener torque
• Engine type: Volvo Penta 5-litre turbocharged industrial diesel
• 4 used per assembly

🔌 Function

Secures the turbocharger exhaust flange while maintaining clamp load through high exhaust temperature cycles.

⚠️ Common Signs of Failure

• Exhaust soot around the flange
• Stud corrosion, stretching or thread damage
• Loose exhaust flange
• Repeated exhaust-gasket failure
• Stud seizure during turbocharger removal

🛠️ Service Notes

• Clean and chase the female thread before fitting so the stud can pull down square and to full depth
• Screw studs in with a proper stud installer or the double-nut method; gripping the plain shank with pliers or self-grips scores it and the nut will never seat or torque correctly afterwards
• Screw the stud home until it seats as the manual for your engine describes, and no further — a stud wound in hard to cure a slack thread will simply split the casting
• Renew studs that are stretched, necked, bent or corroded rather than reusing them; exhaust and manifold studs in particular are cheap next to the work of extracting a broken one
• Tighten the nuts to the torque figures and in the sequence given in the workshop manual for your engine, and where a stud passes into an oil or coolant space seal it as the manual specifies

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20412318 → Supersedes 20803881 → Supersedes 20405609

OEM / Related Numbers

• 20803881 earlier number superseded by this part
• 24426737 - related turbocharger
• 20517048 - retaining hexagon nut
• 20405607 - exhaust flange
• 20795122 - related gaskets
• 20405590 - related gaskets

OEM Reman Alternatives

• 3802191 - Volvo Penta exchange turbocharger

📦 Condition

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