Raw Water Pump Cross Piece – Fits Volvo Penta AQ Diesel Engines (Replaces 858467, 18-3175)

Product Details

This Raw Water Pump Cross Piece is designed for Volvo Penta AQ diesel engines equipped with 6-screw pump covers. It fits a broad range of MD, TMD, TAMD, AD, AQAD, D, KAD, and KAMD series models including AD31, AD41, TAMD31, TAMD41, TAMD42, KAD42, KAD43, KAD44, KAMD43, KAMD44, and KAD/KAMD300 variants. Located between the raw water pump and the pump drive gear unit, this coupler cross piece is critical for proper pump operation.

This aftermarket replacement directly interchanges with Volvo Penta 858467, Orbitrade Marine ORB15467, Crom Marine 115064, GLM GLM12852, and Sierra 18-3175.

• Positioned between sea water pump and drive gear unit
• Essential component for pumps with 6-screw covers
• Check and replace if pump becomes jammed or seizes

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Application

Raw water pump coupler cross piece

Pump Type

6-screw pump cover models

Engine Type

Volvo Penta AQ diesel inboards

Location

Between sea water pump and pump drive gear unit

What's in the Box

• 1 × Raw Water Pump Coupler Cross Piece

Installation Notes

1. Shut off the engine and disconnect the battery to ensure safe working conditions.
2. Drain coolant and remove the raw water pump from the engine block by removing the 6 cover screws.
3. Separate the pump from the drive gear unit to access the coupler cross piece.
4. Inspect the existing cross piece for wear, cracks, or deformation; replace if damaged.
5. Position the new cross piece between the pump and drive gear unit, ensuring proper alignment.
6. Reassemble the pump assembly and torque the 6 screws to manufacturer specifications in a cross pattern.
7. Refill coolant and check for leaks before restarting the engine.

Troubleshooting & FAQ

How do I know if my pump uses a 6-screw cover?

Count the screws holding your pump cover in place. This cross piece is designed for pumps with exactly 6 screws. If your pump has a different screw count, this part may not fit.

Why would my raw water pump jam?

A jammed pump is often caused by a worn or broken coupler cross piece. Over time, this component can wear from continuous rotation, leading to slippage or failure. Inspect the cross piece if your pump stops turning or runs erratically.

Can I reuse the old cross piece during pump maintenance?

It is not recommended. Even if the old cross piece appears intact, wear may not be visible. Replace it during pump service to prevent future failure and ensure reliable pump operation.

Is this compatible with gasoline Volvo Penta engines?

This cross piece is designed specifically for Volvo Penta AQ diesel engines. Check your engine model against the compatibility table to confirm fitment.

How often should the cross piece be replaced?

Inspect the cross piece during routine pump maintenance or whenever the pump is disassembled. Replace it if you notice wear, cracks, or deformation, or every 3–5 years as preventative maintenance.

What are the signs of a failing coupler cross piece?

Common symptoms include erratic pump operation, overheating, reduced cooling flow, or a jammed pump that won't turn. If you experience any of these, inspect and replace the cross piece as needed.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.