739846 Breather Cap | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta breather cap from the Engine group, weighing 0.12 kg and listed for 5 applications across THD, D and DH series engines. It consolidates two earlier numbers, 407173 and 785870, one of which was catalogued as a valve cover, so the old record describes a much larger item than the breather cap supplied now.

🚤 Compatibility

Typically suits:

• Volvo Penta THD102KB
• Volvo Penta THD102KD
• Volvo Penta THD102K-KB
• Volvo Penta D45BPP
• Volvo Penta DH10A

• Engine Family: THD, D, DH

⚙️ Key Features

• 0.12 kg
• Supersedes 407173 and 785870
• One earlier number was catalogued as a valve cover
• 5 applications across THD, D and DH series engines

🔌 Function

Closes the breather opening while allowing crankcase pressure to vent in a controlled way.

⚠️ Common Signs of Failure

• Oil mist or vapour escaping around the cap
• Cap blocked with sludge so crankcase pressure builds
• Seal perished or the cap no longer gripping
• Oil being pushed past seals elsewhere on the engine
• Cap cracked, distorted or missing

🛠️ Service Notes

• Because one old number was catalogued as a valve cover, confirm you are ordering a breather cap and not the larger item that record describes
• Check the breather route through for sludge, as a blocked breather raises crankcase pressure and forces oil past seals

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 739846 → Supersedes 407173

OEM / Related Numbers

• 785870 earlier number superseded by this part
• 407173 earlier number superseded by this part

📦 Condition

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