859939 Delivery Pipe | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta delivery pipe for cylinder number 4, from the Fuel System group, weighing 0.107 kg and listed for 3 applications on TMD and MD series engines. It is the third of the set that replaced the single older number 859704, alongside 859937 for cylinder 2 and 859938 for cylinder 3. The three are the same weight and differ only in routing, so identify by cylinder number.

🚤 Compatibility

Typically suits:

• Volvo Penta TMD22A
• Volvo Penta MD22A
• Volvo Penta MD22P

• Engine Family: TMD, MD

⚙️ Key Features

• For cylinder number 4
• Supersedes 859704, one of three cylinder-specific replacements
• 0.107 kg, the same as 859937 and 859938
• 3 applications on TMD and MD engines

🔌 Function

Carries fuel at injection pressure from the pump outlet to the injector on cylinder 4.

⚠️ Common Signs of Failure

• Diesel seeping from a union nut under running pressure
• One cylinder misfiring or knocking, following the pipe when swapped
• Chafing where the pipe has been touching another pipe or a casting
• Cracks forming at the cone or behind the union nut
• Cone face damaged or picked up on inspection

🛠️ Service Notes

• Never straighten or reshape a delivery pipe to make it reach
• Renew the separating clamps at the same time so the pipes cannot rub
• Bleed through and check each union under running pressure before finishing

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 859939 → Supersedes 859704

📦 Condition

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