21157344 Hollow Screw | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta hollow banjo screw used in pairs at the hot-water outlet / cab-heater connections on TAD750VE and TAD760VE engines. The drilled screw passes coolant through the banjo fitting while clamping the joint between two sealing gaskets.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD750VE
• Volvo Penta TAD760VE

• Engine Family: TAD
• HP Range: Approximately 250-320 HP

⚙️ Key Features

• Genuine Volvo Penta coolant hollow screw
• Two used at the documented hot-water outlet / cab-heater connection
• Confirmed for TAD750VE and TAD760VE
• Uses gasket 947628 at the banjo joint
• Internal drilling must remain clean and unrestricted
• Engine type: Volvo Penta 7-litre inline-six industrial diesel
• 2 used per assembly

🔌 Function

Clamps the banjo connection while allowing engine coolant to flow through the drilled centre into the hot-water outlet circuit.

⚠️ Common Signs of Failure

• Coolant leakage at the banjo joint
• Blocked internal drilling and poor heater flow
• Damaged threads or rounded screw head
• Cracked banjo fitting from incorrect tightening
• Air entry or coolant loss causing overheating

🛠️ Service Notes

• Check the through-passage is clear and clean before fitting; a blocked hollow screw starves whatever it feeds
• Always fit new sealing washers, one each side of the union where the original had them, and never reuse a crushed washer
• Hold the fitting or pipe end against turning as you tighten, so the line is not twisted and the union is not pulled out of position
• Tighten to the figure in the workshop manual for your engine — these seal by crushing the washer, not by force, and over-tightening splits the head or shears the shank
• Bring the system up to working pressure and check for weeps before closing the space up

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 947628 - sealing gaskets
• 20450735 - upward coolant outlet pipe
• 20817900 - side coolant connection pipe
• 20412324 - flange screws
• 947281 - connection gasket
• 20483764 - nipple
• 21066503 - elbow
• 20508662 - plug
• 21801406 - guide washer

📦 Condition

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