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An S4S high-pressure oil pump refers to either
a component for the Mitsubishi S4S diesel engine, used in equipment like forklifts and excavators, or a performance part for certain high-performance Audi S4s. Mitsubishi oil pumps for S4S engines have specific part numbers like and are crucial for lubrication in industrial and construction equipment. For Audi vehicles, the term refers to a High-Pressure Fuel Pump (HPFP) that is upgraded to handle more fuel for performance tuning.
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Mitsubishi S4S Oil Pump for TCM Forklift ... - eBay
eBay
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Mitsubishi S4S Oil Pump. APPLICATIONS: S4S Diesel Engine Caterpillar Clark F18B F18C TCM MITSUBISHI Forklift Loader etc. See full description ...
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New Mitsubishi S4S Injection Pump High Pressure Oil ...
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The New Mitsubishi S4S Injection Pump High Pressure Oil Pump 32A65-10450 is designed to deliver precise fuel injection for Mitsubishi S4S engines, ensuring ...
Mitsubishi S4s Diesel Engine High-Pressure Oil Pump
Alibaba.com
https://www.alibaba.com › ... › Fuel Pump & Parts
Alibaba.com
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Find the premium Mitsubishi S4s diesel Engine Excavator High-pressure Oil Pump NP-VE411F25RNP2639 for trucks, lift trucks, and more.
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48067543 Oil Pump for Mitsubishi Engine S4S S6S
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32C65-04011 High Pressure Oil Pump - RIK Piston Rings
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32C65-04011 Forklift Parts High Pressure Oil Pump For Mitsubishi S4S Engine. Price:USD +1450.00. MOQ:1 SETS. Get Best Price Chat Now.
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People also ask
How to tell if a high-pressure oil pump is bad?
6 Common Warning Signs
- Burning Smell. Burning oil often indicates an issue with the oil pump, which can result in poor engine performance and increased emissions. ...
- Dashboard Warning Lights. ...
- Low Oil Pressure. ...
- Overheating Engine. ...
- Unusual Noises. ...
- Vehicle Won't Start.
Jul 28, 2025
Your Car's Oil Pump: Learn The 6 Signs That Is Failing
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What is better, a high-pressure or high volume oil pump?
A high volume (HV) oil pump moves more oil per revolution, compensating for worn bearings or larger engine clearances by ensuring enough oil gets to all parts of the engine. A high pressure oil pump restricts flow by raising the pressure relief valve's setting, forcing more oil through the system at higher force and is typically needed for engines operating at very high RPMs. The right choice depends on the specific needs of the engine, with standard pumps being sufficient for most stock applications.
High Volume (HV) vs. High Pressure (HP) pumps
Feature | High Volume (HV) Pump | High Pressure (HP) Pump |
|---|---|---|
Primary Function | Moves more oil per revolution. | Increases the force (pressure) at which oil is delivered. |
Mechanism | Larger gears/rotors. | Stiffer spring in the pressure relief valve. |
Best For | Engines with large internal clearances (high mileage, performance builds) or those with extra oiling demands (e.g., oil coolers). | Engines that operate at very high RPMs, such as race engines, where increased pressure is needed to keep up with the demand. |
Effect on Pressure | Can increase pressure, especially at idle, by compensating for oil leaks through worn bearings. | Directly raises the maximum pressure before the relief valve opens. |
Potential Downsides | Can lead to lower power, especially in tight engines, as it requires more energy to pump the oil. Can potentially wear distributor gears faster. | Can cause oil to bypass the filter if the relief valve is set too high for the oil's viscosity, especially when the oil is cold. |
Which one should you choose?
- For most daily drivers or stock engines: A standard volume and pressure pump is sufficient.
- For a performance engine with wide bearing clearances: A high volume pump is a good choice to ensure adequate lubrication.
- For a high-RPM racing engine: A high pressure pump or a high volume/high pressure combo pump may be necessary to maintain pressure at peak RPMs.
- If unsure: Consult an engine builder who can advise on the best pump for your specific engine build and driving conditions.
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What are the three types of oil pumps?
Maintaining an Oil Pump
| Topic | Summary |
|---|---|
| Three Types | Gear (simple), rotor (efficient), vane (precise pressure control). |
| Most Common Type | Gear pumps: affordable, reliable, dominant in standard vehicles. |
| Pros & Cons | Gear: durable/noisy; rotor: quiet/less durable; vane: precise/costly. |
Types of Oil Pumps - Complete Guide - HYMA Lube
HYMA Lube
https://www.hymalube.com › types-of-oil-pumps
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S4 - S6 Oil Pumps The Same?
NoPistons
https://www.nopistons.com › s4-s6-oil-pumps-same-11013
NoPistons
https://www.nopistons.com › s4-s6-oil-pumps-same-11013
Jan 22, 2003 — Are the Series 4, 5, and 6 oil pumps the same? Only requirements difference I can think of is the S6 had to feed two turbos.
2012 a8l 4.2 making this noise I changed hpfp but ...
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I noticed it was leaking oil around the vacuum pump, so I topped up the oil after seeing the leak — but the noise is still there. Could that ...
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https://www.rx7club.com › s4-oil-pump-766967
Jun 27, 2008 — You can stuff an FC turbo oil pump into your non-turbo 13B no problem. You'll get slightly higher (i.e. better) oil pressures. In fact, racers ...
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