3804684 Cylinder Head Core | Genuine Volvo Penta Part

🔧 Product Description

Core deposit for a cylinder head, in the Engine group. It is the refundable charge raised against the old cylinder head when the exchange unit is bought, and it comes back once the worn cylinder head is returned. The line itself is an accounting entry rather than a part, so nothing ships against it on its own. Under Volvo Penta's core numbering it pairs with part 3801684, which is the number to quote for the exchange unit itself. It is one of 7 cylinder head cores running through this block, and nothing published against them separates one from another, so order the number that matches the cylinder head actually coming off rather than working from the description.

⚙️ Key Features

• Core deposit line, not a cylinder head you can fit
• Pairs with part 3801684, the exchange unit it belongs to
• Refunded when the old cylinder head is returned
• One of 7 cylinder head cores here, so order by part number
• Engine group

🔌 Function

As a line item it carries the refundable core charge on the exchange; the cylinder head itself closes the top of the bores and carries the valves, seats and injector bores along with the inlet, exhaust and coolant passages.

⚠️ Common Signs of Failure

• This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the cylinder head being exchanged
• Coolant lost with no external leak, and white smoke or a sweet smell at the exhaust
• Bubbles or pressure building in the header tank, or oil and coolant mixing
• Compression down on one or more cylinders, with hard starting and a misfire
• On strip-down, a cracked or bowed head face, burnt or recessed valve seats and corroded coolant passages

🛠️ Service Notes

• The charge is refunded when the worn cylinder head is returned, so keep the old unit and arrange the return collection when the order is placed rather than scrapping it
• Ordering this number on its own supplies no part - it goes on the order beside the exchange unit, part number 3801684
• Pressure-test the old head and check the deck for distortion before condemning it, and renew the head gasket set and the stretch bolts when the exchange unit goes on.

📦 Condition

• Refundable core deposit - not a physical part