What Actually Wears Out on the D11/D13 and MP7/MP8
Water pump is the big one — these engines run a variable-speed pump (24152057) on later applications and a fixed-speed unit (24152058) on earlier ones, and they don't last forever pushing coolant through that block. When one starts weeping at the weep hole or the bearing gets noisy, it's coming off the truck.
Charge-air cooler hoses take a beating too — heat cycling and boost pressure crack the silicone or blow the clamps loose over time. We carry the 3" ID x 6" length hump hose with stainless clamps built in, which covers a lot of the common CAC plumbing on these chassis.
Round it out with the serpentine belt (12PK1625 cross-references to 20582557/23961868), engine air filter, and fuel filter — routine stuff, but if you're already in there for a water pump, check the belt condition and swap filters while the hood's up.
How to Order the Right Part — Don't Guess
Surest way to get this right the first time: pull the number off the old part or run the truck's VIN and engine serial number. Volvo and Mack both stamp engine serials on the block, and that number tells you exactly which water pump variant and hose config you're dealing with — variable-speed vs fixed isn't interchangeable, and guessing wrong means a second trip to the counter.
On the CAC hose, measure ID and length off the hose you're pulling, not off the fitting — a hose that's close but half an inch short will leak boost no matter how tight you clamp it. On the belt, count ribs and check the part number stamped on the old belt's backside if it's still legible.
If you're not sure which pump or filter your truck takes, bring in the old part or call it in with the VIN. We'd rather spend two minutes confirming than have you driving back with the wrong box.
Why Buy the Aftermarket Version From Us
Dealer pricing on a D13 water pump or a Mack MP8 fuel filter isn't cheap, and a lot of fleets running multiple trucks can't justify OE pricing on parts that are wear items, not core engine components. Our aftermarket parts cross-reference to the same OE numbers and carry a 6+ month warranty — for a service part, that's plenty of coverage.
We're not a call center reading a screen. Ask about fit, ask about the difference between the fixed and variable-speed pump, ask what else you should replace while you've got the fan shroud off — we've had these engines apart plenty of times and can tell you what actually fails together.
Same-day shipping out of Tacoma means a truck down in the yard doesn't sit waiting on a part from three states away.
Frequently asked questions
Will this water pump fit my Volvo VNL with a D13?
Depends on the year and whether it's the variable-speed setup or fixed-speed. Give us the VIN or the number off the old pump and we'll confirm which one — 24152057 and 24152058 are not interchangeable.
Is the aftermarket part as good as the dealer part?
Honestly, it does the job — it's a direct replacement, cross-referenced to the same OE number, and backed by a 6+ month warranty. It's not a Volvo-branded box, and we're not going to tell you it is. For a water pump, hose, or filter, most fleets running these engines don't see a difference in how long it lasts.
How do I know if I need the fixed-speed or variable-speed water pump?
Check the engine serial number or send us the VIN — Volvo and Mack switched configurations across model years and it's not always obvious from looking at the old pump if it's partially seized.
What size CAC hose do I need?
Measure the ID and length off the hose you're removing — we carry 3" ID x 6" length with stainless clamps, but if your run is longer or a different diameter, measure twice before you order.
Not sure which one your engine takes?
Run your VIN and we’ll match parts to your exact truck and engine serial, or call the counter — a person who knows these engines verifies fitment by the number on your old unit before the order ships. No wrong-box returns.