3804658 Longblock Core | Genuine Volvo Penta Part

🔧 Product Description

Core deposit for a longblock, in the Engine group. It is the refundable charge raised against the old longblock when the exchange unit is bought, and it comes back once the worn longblock 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 3801658, which is the number to quote for the exchange unit itself. It is one of 13 longblock cores running through this block, and nothing published against them separates one from another, so order the number that matches the longblock actually coming off rather than working from the description.

⚙️ Key Features

• Core deposit line, not a longblock you can fit
• Pairs with part 3801658, the exchange unit it belongs to
• Refunded when the old longblock is returned
• One of 13 longblock cores here, so order by part number
• Engine group

🔌 Function

As a line item it carries the refundable core charge on the exchange; the longblock itself is the cylinder block built up with crankshaft, pistons, connecting rods and cylinder head, so that the ancillaries transfer across from the engine coming out.

⚠️ Common Signs of Failure

• This is a deposit line and has nothing to fail in itself; the signs below are what normally condemns the longblock being exchanged
• Blue smoke at the exhaust and oil consumption climbing between services
• Compression low or uneven, with hard starting and a loss of power under load
• Heavy blow-by at the breather, enough to lift the oil filler cap
• On strip-down, scored bores, worn or picked-up bearing shells and a crankshaft past its regrind limits

🛠️ Service Notes

• The charge is refunded when the worn longblock 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 3801658
• A longblock covers the block, crankshaft, pistons and cylinder head, so confirm what is coming off before the deposit is raised - the shortblock cores 3804666 and 3804667 and the complete engine cores in this block cover different amounts of the engine.

📦 Condition

• Refundable core deposit - not a physical part