20405583 Flange Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta flange screw used to secure the crankshaft main-bearing caps to the cylinder block. Ten screws are used on four-cylinder engines and fourteen on six-cylinder engines.

🚤 Compatibility

• Engine Family: D, TD, TAD, MD

Full model list at the end of this description.

⚙️ Key Features

• High-strength main-bearing-cap fastener
• Ten used on D5 four-cylinder blocks and fourteen on D7 six-cylinder blocks
• Maintains main-bearing bore alignment under combustion load
• Must follow the specified tightening sequence and torque/angle procedure
• Do not reuse if the workshop manual identifies the screw as torque-to-yield
• Engine type: Volvo Penta four- and six-cylinder industrial diesel

🔌 Function

Clamps each main-bearing cap to the cylinder block and preserves crankshaft main-bore alignment.

⚠️ Common Signs of Failure

• Main-bearing cap movement or fretting
• Damaged or stretched screw threads
• Unable to achieve the specified torque
• Main-bearing alignment problems
• Abnormal lower-engine knock

🛠️ 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

• 20557730 - related crankcase or cylinder-block references
• 20581446 - related crankcase or cylinder-block references
• 11700278 - related main-cap bushings

📦 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