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International 8100 Diesel High Pressure Oil Pumps

International 8100 Diesel high pressure oil pumps

Starting at low prices, AutoBuffy stocks multiple diesel high pressure oil pumps from top OE-quality brands. The high pressure oil pump generates the extreme oil pressure needed to actuate fuel injectors in hydraulically actuated injection systems. When it fails, the engine loses the pressure required to fire injectors reliably, causing hard starts, misfires, and potential no-start conditions.

Signs your International 8100 needs a new diesel high pressure oil pump

  • Hard start or extended cranking before the engine fires, especially in cold weather
  • Rough idle or misfiring cylinders caused by inconsistent injector actuation pressure
  • Low or erratic high pressure oil system readings on a diagnostic scan tool
  • White or gray smoke from incomplete combustion due to weak injector firing
  • Engine stalls shortly after starting and will not return to a stable idle
  • ICP (injection control pressure) sensor codes stored, such as low ICP or ICP out of range faults

Which diesel high pressure oil pump should you buy for your International 8100?

The main decision is whether to choose an OEM-equivalent remanufactured unit, a new aftermarket pump, or a performance-upgraded pump. Remanufactured units offer cost savings and are suitable for stock applications, while new aftermarket pumps eliminate concerns about a core's condition. If you run modified injectors or higher demands, an upgraded pump with increased flow capacity is worth considering.

New OEM / OE-Supplier
Best for
Owners who want exact factory fit and maximum reliability
What you get
Direct replacement with original flow rates and sealing specs; highest confidence in longevity
Remanufactured (Reman)
Best for
Budget-conscious owners with a stock, lower-mileage core available
What you get
Rebuilt to OE specs with replaced wear components; requires a core return; lower upfront cost
New Aftermarket
Best for
Owners without a qualifying core or who want a fresh unit at a mid-range price
What you get
Brand-new internals without core dependency; quality varies by brand so choose a reputable supplier
High-Flow / Performance Upgraded
Best for
Owners running larger injectors, performance tunes, or added accessories
What you get
Increased displacement or flow capacity to maintain adequate ICP under elevated demand; may require supporting modifications

Replacing a diesel high pressure oil pump on a International 8100

Advanced⏱ 3–6 hoursSocket set with standard and deep socketsTorque wrenchValley cover gasket set and engine-safe sealantOil drain pan and clean lint-free ragsScan tool capable of reading ICP and commanding the IPR for post-install verification

Replacing the high pressure oil pump typically requires removing the intake manifold and valley cover to access the pump mounted in the engine valley or front cover, depending on the engine design. The pump drive must be properly aligned during reinstallation, and all gasket surfaces need thorough cleaning before assembly. After installation, use a scan tool to verify ICP builds to specification during cranking before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace diesel high pressure oil pumps on a International 8100?
Parts start at low prices at AutoBuffy. Total replacement cost depends on whether you hire a shop or DIY. Professional labor can add several hours of shop time to the bill because the pump is typically buried under the valley cover or front of the engine, making this one of the more involved diesel repairs.
What causes a diesel high pressure oil pump to fail on a International 8100?
The most common causes are extended oil change intervals, contaminated or incorrect oil viscosity, and internal wear from high mileage. Aerated oil from a low oil level or a failing oil reservoir screen can also accelerate pump wear by starving the internal gerotor or piston assembly of proper lubrication.
Can I drive my International 8100 with a failing high pressure oil pump?
No. A failing high pressure oil pump means injectors are not receiving consistent actuation pressure, leading to misfires and incomplete combustion. Continued driving risks damaging injectors, contaminating the oil supply with fuel, or causing a no-start situation far from home. Address the fault as soon as symptoms appear.
How do I confirm the high pressure oil pump is the problem on my International 8100 and not the injectors?
Connect a compatible scan tool and monitor ICP (injection control pressure) during cranking and at idle. If pressure builds slowly, stays below specification, or drops erratically, the pump or its reservoir system is suspect. If ICP is normal but individual cylinders misfire, the fault is more likely injector-side. Always check the IPR valve and ICP sensor first as they are less expensive diagnostics.
Should I replace the IPR valve and reservoir screen when I replace the high pressure oil pump on a International 8100?
Yes, and it is strongly recommended. The IPR (injection pressure regulator) valve and the oil reservoir stand tube or screen are inexpensive relative to the pump itself and share the same labor access. Installing fresh seals, a clean screen, and a known-good IPR valve at the same time eliminates comeback repairs and ensures the whole system performs correctly.
How long does a diesel high pressure oil pump last on a International 8100?
With consistent oil changes using the correct viscosity and keeping the oil level full, high pressure oil pumps typically last well into high mileage territory. Neglected oil maintenance is the single biggest factor in shortened pump life. There is no fixed replacement interval; monitor ICP performance and oil condition as the primary indicators of pump health.

More parts for your International 8100

Fuel Injector O-Ring KitA/C Expansion ValveAccessory Drive Belt PulleyHood DamperA/C Orifice TubeA/C CondenserHVAC Blower Control SwitchSerpentine Belt

Diesel high pressure oil pumps for other International models

International 2674International 4600LPInternational 7500International 3600International 3000International CXT