After replacing my oil pressure switch the second time on my Everest 650, I asked AI

[BIG WOOD]

And she made the creators of this machine look really bad


Thanks — the Hyundai 1.6L (G4 series) engine used in the Prochem Everest 650 has some specific reasons its oil pressure switches tend to fail more often than they do in normal car applications. These units run under conditions Hyundai never originally designed them for.









Why Oil Pressure Switches Go Bad on the Hyundai 1.6L in a Prochem Everest 650

1. Constant High RPM Operation (Most Common Cause)
Truckmount units like the Everest 650 run the Hyundai 1.6L at sustained high RPM for long periods (often 2–4 hours straight).


This causes:
Higher oil temperature

• Higher engine bay temperature
• More pressure spikes
• Faster diaphragm fatigue inside the switch

The oil pressure switch simply wears out much faster than it would in a car.



L 2. Extreme Heat Inside the Truckmount Enclosure

Unlike a car, a truckmount engine sits inside a partially enclosed box with:
Much less airflow

• Hot exhaust and blower components nearby
• Radiant heat buildup

This “hot soak” environment cooks the switch, making the plastic body or rubber diaphragm deteriorate.
3. Vibration From the Blower and Pump
The vibration level in a truckmount is much higher than in a car:

Roots blower

• High-pressure pump
• Coupling harmonics
• 
  
• This shakes the oil pressure switch and can crack:

The crimp seal

• The internal electrical contacts
• The thread base

4. Oil Seepage / Leaks From High Pressure

Everest units sometimes run higher oil pressure due to:
Higher sustained RPM

• Slightly thicker oils used in commercial machines
• Relief valve behavior under heat

Occasional pressure spikes can rupture the switch’s internal diaphragm.

5. Oil Contamination From Long Run Sessions

If oil is not changed frequently enough (which is easy to forget on truckmounts), heat breaks it down and sludge forms.


Sludge or carbon in the oil passage can:
Clog the sensor

• Damage the diaphragm
• Cause false low-pressure signals

6. Cheap Aftermarket Switches Don’t Survive in Truckmounts

Many replacement sensors are designed for normal passenger car duty.


Truckmount conditions are harsher, so cheap switches fail quickly.

The Everest 650 benefits from:
OEM Hyundai switches

• Delphi or NTK equivalents
  (These handle heat and vibration better
• 
  
• 
  
• 7. Connector Oil Intrusion
• These Hyundai switches are known to fail through the electrical connector, allowing oil to wick into the harness.

If you see oil inside the plug, the switch has already failed internally.


Good news:
This is one of the most common failures on Everest 650 units, and it does not usually mean the engine actually has a low oil pressure problem.


Might be why Sammy makes his radiator fan suck heat out of the truck instead of pulling it in the truck.
Common sense. What most of these manufacturers are lacking. I hate learning this stuff the hard way.

 

[BIG WOOD]

Very impressive

I asked her a couple other questions about her opinions on different brands. I laughed at her opinion on Amtex.

 

[Dwain Ray]

Very impressive

I asked her a couple other questions about her opinions on different brands. I laughed at her opinion on Amtex.

If the switch only senses pressure can you relocate it with a bit of creative plumbing?

 

[BIG WOOD]

If the switch only senses pressure can you relocate it with a bit of creative plumbing?

It is a simple 1/8” fine threaded hole, but I don’t know if adding a metal extended pipe would affect that. I’m not in the re-engineering mindset anymore. It’s very stressful, wondering if I’ve done more harm than good. With the price of this truckmount now to replace what I have, I would never forgive myself if I ruined this machine just because I wanted to experiment with it

 

[Kenny Hayes]

Was she for or agin the Amtex?

 

[BIG WOOD]

Was she for or agin the Amtex?

she used the phrase "red flag"

 

[Kenny Hayes]