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What is the cause of low oil pressure in the generator

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Low oil pressure can be wrong oil viscosity, blocked or incorrect oil filer, and off course defective oil pump

Posted on Nov 17, 2013

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Posted on Jan 02, 2017

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Make sure oil level is up to par. When it shuts down take the wire off the low oil switch and see if it runs.

Posted on Mar 22, 2011

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Can a 04durango oil cap cause pressure loss n light to come on


No.
The oil pump in the engine produces the oil flow and the clearances between moving parts in the engine is what creates the "oil pressure" (which is why a worn engine will typically display low oil pressure).

The cap on the oil filler opening is totally irrelevant to the oil pressure being generated in the engine.

If you have low oil pressure you need to have it investigated immediately. Driving the vehicle with low oil pressure will cause engine damage because insufficient lubrication will be getting to all moving parts. If your 2004 engine is not very high mileage, in good condition and if well maintained with adequate oil changes and so on(which most are not) then the problem may be that the oil pressure relief valve is jammed open or the oil pump itself might be failing and is unable to produce sufficient flow volume.

If you have a worn engine, replacing the oil pump will not fix a low oil pressure issue solely caused by excessive clearances between moving parts due to years of normal wear or years of higher wear due to maintenance neglect.

Mar 29, 2016 | Cars & Trucks

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How to tell if oil pump is starting to go out?


1. Engine Noise. With a bad oil pump sufficient engine oil will not get to all parts of the engine, especially the top end, and you will get engine noise with metal parts that would normally be lubricated and quiet knocking due to metal to metal contact. Engines with hydraulic lifters that become noisy can be a sign that they have insufficient oil supply. In addition to the hydraulic lifters, your valve train may begin to make noise if your oil pump begins to fail. Valve train components need to be properly lubricated as well. A bad oil pump can result in a lot of additional noise from your valve train system.

2. Higher engine temperature. Poor lubrication because of poor oil flow generated from the pump will cause friction in the engine and the engine temperature will rise. Good oil flow is essential for lubrication and reducing friction to a minimum.

3. Low oil pressure. The oil pump generates oil flow through the engine but tolerances between metal parts produce the oil pressure. Very worn engine bearings will result in low oil pressure. Thus a worn engine will have low oil pressure even though the oil pump may be fine and there is no issue with the oil pressure relief valve either. However you will also experience low oil pressure due to a failing oil pump because poor oil flow will also result in lower oil pressure.

If your oil pressure warning light has been triggered in your engine, the causes of the low pressure need to be properly investigated because the problem may not be with the oil pump. People replace oil pumps assuming that is always the problem and then still have low oil pressure because the pump was not the problem to begin with.

Dec 05, 2015 | Cars & Trucks

1 Answer

Why does it run only in the start position?


Hello Martin, Your generator might have a low oil pressure shutdown switch. First check the oil level. If oil level is low, fill oil to proper level. If oil level is fine, I would install an auxiliary oil pressure gauge . If oil pressure is normal, I would change the oil sender unit. If oil pressure is low, I would change the oil pump.

Aug 03, 2015 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

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I change oil today on a 27KW liquid cooled generator today. I started it let it run for 10 min. then changed oil. After oil change went to start it would not, said low battery then check battery. Repl


Was oil filter changed as well ? This may result in low oil pressure shutdown until filter is filled with oil. Is there a sump oil level sensor that has stuck when oil was drained and now causing a no oil shutdown ? The battery indicator may not be real if the battery is ok.

Nov 24, 2014 | Generac Guardian Electrical Supplies

1 Answer

How do i disconnect the low oil sensor


Some oil sensors will stop the generator from running if unplugged, IE they close the circuit on oil pressure, some close the circuit on oil pressure. I wouldn't recommend but with it running just take the single wire off the sensor, if it stops immediately then it requires the signal grounded to run. Some ground on low oil.

Oct 26, 2012 | Coleman Powermate Subaru 5000W Portable...

1 Answer

Where can i find the low oil alert module ?


Yes , if there is an errror on the oil pressure switch or a low oil level then the engine will not be allowed to turn in. Check and refill oil, check the oil pressure switch , it can be clogged and so might not work.

Nov 06, 2011 | Coleman Powermate Powermate 5000W...

1 Answer

My 40g shuts off after running perfect for a feww minutes


It is very likely you are having a problem with the low oil pressure switch or the high temperature switch. Both of these are connected to the No.85 wire which in turn goes back to the control board. If the temperature exceeds the predetermined level (apprx 305 degrees F) the high temperature switch will then ground wire 85 causing the unit to shut down. Same thing with the oil pressure switch, if the oil pressure switch goes below 10 psi the low oil pressure switch will ground wire 85 causing the unit to shut down. To determine which is causing the problem disconnect first the low oil pressure switch (Located by the oil filter) and start unit if it contunues to run after 10 seconds and does not shut down then the oil pressure is the problem. Then you must use a mechanical pressure gauge connected where the low oil pressure switch is to determine if you actually have less than 10 psi of oil or if the low oil pressure switch is just bad. Try the same thing with the high temperature switch also located close to the oil filter if you disconnect it and it continues to run more than 10 seconds then you have and engine that might be overheating. Anything that gets caught in the air intake on the generator itself ill cause this unit to overheat, I've seen it **** garbage in through the air intake and cause the unit to overheat because of poor air flow. If their are no restrictions and you have good air flow than chances are you have a bad high temperature sensor.

Hope this helps, please let me know.

Dec 01, 2009 | Guardian Rv Generator 4800 Watt, Gasoline,...

1 Answer

FG5700AK Low oil switch cuts engine almost off and then back on. Changed to lighter oil 10-30 and did not help. If I unhook the low oil switch it runs fine


Use a pressure gauge and make sure you have at least 10 psi, if you do then replace the oil pressure cutoff switch if this switch is bad no oil you put in it will fix the problem. If you don't then you have internal engines problems.

A lighter weight oil will only make the matter worse because its thinner and could actually cause the pressure to drop even further. If you have a low pressure problem you could try a heavier weight oil but its only going to increase it a little bit.

Nov 28, 2009 | McCulloch 13HP 338 Cc Portable Generator #...

1 Answer

Frequent top up and low oil pressure guage.


if the oil need frequent topping up it can only dissapear in 2 ways a leak or the engine is very worn and is burning it.
a worn engine is also a cause for oil presssure dropping once the engine has warmed up probably worn main and big end bearings on the crankshaft as you will know oil is thicker when cold so oil pressure is increased

Nov 18, 2009 | Electrical Supplies

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