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Old 09-06-2014, 20:13   #1
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Perkins 4108 oil pressure drop

Hello Everyone,

My 4108 runs perfectly, does not overheat, no smoke out the back. However, literally from one day to the other the oil pressure dropped from 3,4 to 3 bar (same operating conditions, oil level ok). This is still within the recomended operating range but what concerns me is the sudden drop from one day to the other. Is it a faulty gauge or is it a bigger problem (oil pump...) linked with the engine?. If it is the engine what are the probable causes?
Thank your for your advice,
Cyril
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Old 09-06-2014, 20:32   #2
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Re: Perkins 4108 oil pressure drop

Have you done anything? Oil change, etc? If not check that you don't have diesel mixed with your lube oil. Could be a seal in the HP pump or leak in the lift pump if you do.
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Old 09-06-2014, 20:40   #3
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Re: Perkins 4108 oil pressure drop

No, nothing changed., I arrived in port and left the next morning. i looked at the oil dipstick to check the oil level (which was ok) and did not see any signs of diesel being present, is there another way to check?
Thanks
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Old 09-06-2014, 20:46   #4
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Re: Perkins 4108 oil pressure drop

If there was enough diesel to affect your oil pressure reading you would be able to smell it on the dipstick or feel it when rubbed between thumb and finger tip. I would just keep a close eye on things and if it drops again check your oil pressure sender and pressure gauge first if you see no rise in oil level.
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Old 09-06-2014, 20:48   #5
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Re: Perkins 4108 oil pressure drop

Ok thanks
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Old 09-06-2014, 21:06   #6
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Re: Perkins 4108 oil pressure drop

The oil pressure relief valve would do that. I'm surprised they last as long as they do, kind of like our heart valves. Wow.
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Old 09-06-2014, 21:14   #7
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Re: Perkins 4108 oil pressure drop

Guy, if that is the case does it need replacement or do I leave it as it is since the pressure is within specs? Can it get worse and cause total oil pressure loss?
Thanks
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Old 09-06-2014, 21:42   #8
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Re: Perkins 4108 oil pressure drop

I'm not sure there is any way to know. It would be worse when the oil is hot. I've seen an rebuilt engine go from good oil psi cold, to lousy when hot because of a leaking valve seat. Of course it could leak cold also. Nothing else inside the engine could be intermittent unless you are in the process of spinning a bearing. If you are, you will soon know.
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Old 11-09-2022, 17:52   #9
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Re: Perkins 4108 oil pressure drop

Is it an electric or mechanical pressure gauge?
A loose connection or corrosion on a connection could produce that effect if its a wired gauge.
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