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International Mxt Diesel High Pressure Oil Pump Seal Kits

International Mxt Diesel high pressure oil pump seal kits

Starting at low prices, AutoBuffy stocks multiple diesel high pressure oil pump seal kits from top OE-quality brands. This kit replaces the seals and O-rings that keep high-pressure oil contained within the HEUI injection system. When these seals fail, injection pressure drops, causing hard starts, misfires, and potential engine damage from oil starvation to the injectors.

Signs your International Mxt needs a new diesel high pressure oil pump seal kit

  • Hard or extended cranking before the engine fires, especially when cold
  • Rough idle or noticeable engine misfire under light load
  • ICP (Injection Control Pressure) readings that are low or erratic on a scan tool
  • Visible oil seepage or wet residue around the high pressure oil pump housing
  • Excessive white or blue smoke at startup that clears slowly or not at all
  • Sudden power loss under acceleration, particularly when towing or hauling

Which diesel high pressure oil pump seal kit should you buy for your International Mxt?

The most important decision is whether to choose an OEM-equivalent kit with every seal and O-ring needed for a complete job, or a partial kit covering only the most common failure points. Material quality matters here — Buna-N rubber handles standard operating temperatures, while Viton seals hold up better to extreme heat cycles and degraded fuel contamination.

OEM-Equivalent Complete Kit
Best for
Full pump reseal, high-mileage engines, preventing a comeback job
What you get
Every seal, O-ring, and gasket needed to fully rebuild the pump and surrounding connections
Viton Seal Upgrade Kit
Best for
Engines with a history of overheating, biodiesel use, or repeated seal failure
What you get
High-temperature Viton O-rings and seals with superior chemical and heat resistance over standard rubber
Partial / IPR Seal Kit
Best for
Targeted repair when only the ICP or IPR valve area is leaking
What you get
Seals specific to the injection pressure regulator or sensor port, at a lower cost than a full kit
OEM Dealer Kit
Best for
Owners who want exact factory specification materials and part matching
What you get
Manufacturer-sourced seals with guaranteed dimensional accuracy, typically at a higher price point

Replacing a diesel high pressure oil pump seal kit on a International Mxt

Advanced⏱ 2–4 hoursSocket set with extensions (metric and standard)Torque wrenchPick and O-ring removal toolClean lint-free rags and oil-safe solventScan tool capable of reading ICP pressure

Depressurize the oil system and thoroughly clean the pump housing area before disassembly to prevent contamination from entering the high pressure circuit. Lubricate all new O-rings with clean engine oil before installation, and seat each seal carefully to avoid nicks that cause immediate re-leakage. After reassembly, use a scan tool to confirm injection control pressure builds correctly before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace diesel high pressure oil pump seal kits on a International Mxt?
Seal kit parts start at low prices on AutoBuffy. Total repair cost depends on labor — a shop typically charges two to four hours of diesel labor time on top of the kit price. Doing the job yourself keeps costs to just the kit, making this one of the better DIY value repairs on a HEUI-equipped diesel.
Can I drive my International Mxt with a failing high pressure oil pump seal?
Short distances are possible, but it is not advisable. A leaking seal causes injection control pressure to drop below the threshold needed to fire injectors reliably. Continuing to drive risks injector damage, oil loss into unintended areas, and a no-start condition — repairs that cost significantly more than replacing the seal kit early.
How long do high pressure oil pump seals last on a International Mxt?
Seal lifespan varies widely based on oil change intervals, oil quality, and operating temperatures. Under normal maintenance, seals on a HEUI diesel typically last many years, but heat cycling, extended oil change intervals, or the use of non-spec oil accelerates hardening and cracking. Seals discovered leaking at any mileage should be replaced promptly.
Do I need to remove the high pressure oil pump to replace the seals on a International Mxt?
It depends on which seals are leaking. Some external O-rings and the IPR valve seals can be accessed and replaced with the pump in place. A full internal reseal generally requires pump removal. Inspect the leak location carefully before disassembly to determine whether a partial or complete seal kit is appropriate for your repair.
What oil should I use after replacing the high pressure oil pump seals on a International Mxt?
Use the oil viscosity and specification listed in your owner's manual for your Mxt. HEUI systems are sensitive to oil quality because engine oil is also the injection hydraulic fluid. Always use oil that meets the required diesel spec rating, and change it at the recommended interval to protect the new seals and pump internals.
Will replacing the seal kit fix low ICP pressure on my International Mxt?
It often does, but not always. Low injection control pressure can also be caused by a faulty IPR valve, a worn high pressure oil pump, or a failing ICP sensor. Test ICP pressure with a scan tool before and after the repair. If pressure remains low after a confirmed complete seal, further diagnosis of the pump and IPR valve is needed.

More parts for your International Mxt

Secondary Air Injection Pipe ConnectorFuel Injector O-Ring KitTurbocharger Mounting KitBrake Hydraulic HoseEngine Air FilterAuxiliary Engine Cooling Fan RelaySerpentine BeltPower Steering Cooler

Diesel high pressure oil pump seal kits for other International models

International 4200LPInternational 4100 SBAInternational 4100International 3200International 1652SCInternational RXT