20405874 Flange Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta flange screw used in sets of four on low-mounted turbocharger exhaust and oil-return flange assemblies. It is confirmed on TD720GE and TAD730-TAD733 engine arrangements.

🚤 Compatibility

• Engine Family: TD, TAD

Full model list at the end of this description.

⚙️ Key Features

• High-strength flange-head screw
• Four used in the applicable turbocharger flange assembly
• Secures flange 20405916 with gasket 20405969
• Also catalogued in low-mounted turbo exhaust-outlet arrangements
• Must be tightened evenly to the specified torque
• Engine type: Volvo Penta 7-litre turbocharged industrial diesel
• 4 used per assembly

🔌 Function

Clamps the turbocharger oil-return or adjoining flange and gasket at the specified preload.

⚠️ Common Signs of Failure

• Oil or exhaust leakage at the flange
• Screw loosening under vibration
• Rounded flange head
• Repeated gasket failure caused by uneven tightening

🛠️ Service Notes

• The integral flange spreads the load and forms the bearing face, so do not add a separate washer unless the workshop manual for your engine specifically calls for one
• Clean the threads and the seating face before fitting — grit, paint or old sealant under the flange gives a false torque reading and the joint will slacken off in service
• Where the flange is serrated it must bear directly on clean metal to grip; discard any screw with a deformed flange or damaged serrations rather than reusing it
• Tighten to the torque and sequence given in the workshop manual for your engine, and treat the screw as single-use where the manual specifies an angle-tightened or stretch fastener
• Check the thread in the receiving component at the same time; a pulled or corroded thread will not hold a new screw however carefully it is torqued

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 20405916 - related turbo oil-return flange
• 20405969 - flange gasket
• 20451015 - related manifold
• 20405879 - related oil-return flange on other turbo arrangements
• 20500295 - related turbocharger references
• 3802178 - related turbocharger references

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAD520GE, TAD520VE
• 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 TD720GE, TD720VE PP
• Volvo Penta TAD650VE
• Volvo Penta TAD660VE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TAD734GE
• Volvo Penta TAD751GE
• Volvo Penta TAD752GE
• Volvo Penta TAD753GE
• Volvo Penta TAD754GE
• Volvo Penta TAD760VE