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Whats going on with my oil pressure?


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Hi,

Following an earlier thread that I posted about oil pressure, yesterday I changed the oil pump on my 200tdi together with a new filter and oil which I have changed to 20/50 from 15/40. I have to say that it has made not one jot of difference and that after start-up when the pressure needle leaps to the top of the gauge, it then settles back to about 20psi. How depressing is that.

I used to have pressure well over 45psi and over a period of about 6 months it has dropped further and further down and oscillates up or down according to whether I am going around a left-hand or right-hand corner - sometimes registering zero!

I recall that Western mentioned about the condition of the oil cooler which could affect the oil and make too thin if not properly cooled. What I don't understand is that this should surely only be an issue once the engine has warmed up - not straight after start-up when things are ice-cold still. There does not seem to be excessive play in the turbo which another poster suggested so I am really at a loss as to what to do next. Oh yes, and by the way, an 11mm socket and extension bar falling from the sump onto ones head does REALLY hurt.

Ged

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you can check by removing the fuel lift pump & the cover plate it's bolted to, the rear number 4 cam bearing is visible with yhe aid a good torchlight, you should be able to see if the sleeve bearing has moved from it's location.

oil pressure gauge should oscillate while driving, maybe the sender unit is faulty. I refer you to the photo's I added in the previous thread showing my 200Tdi's oil pressure , if yours is within the readings I get [& mine has much more mileage on] I woudn't worry about it.

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Cheers Ralph. I have looked at your photos and very helpful they are too. My oil gauge is capilliary fed so I don't know if this makes a difference. Also do the oil pressue light and gauge operate independently of eachother or are they linked. I ask this because the light flickers occasionally when coming to an abrupt halt although the gauge does not necessarily give the same information.

I realise that I may be making more out of this than I should, however what concerns me is that the pressure has dropped so markedly over the past 6 months. If it had always been this low I probably would never have noticed it but the sudden change worries me.

I'll have a look for the bearing sleeve as you describe Ralph. Assuming it has moved, what is the solution?

Ged

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the oil pessure gauge & warning light are independent, if the bearing has moved it's a engine strip & camout job, for a engine bebuild & new bearings/line ream to be carried out. I thought mine had moved when my oil light kept flicking on/off, checked it & all was well.

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Thanks very much Ralph. I really hope that the cam is OK as I couldn't face stripping the engine. I have been out this mornng giving the 110 a bit of a trial and the oil pressure does actually seem to be fairly improved. I don't know whether this is due to the oil pump or simply a the thicker oil and a new filtre. I Still don't understand why the pressure fluctuates so much when cornering though - lh bend and needle drops, rh bend and needle rises over 40. Will have to see how it goes over the next few days as I've got a couple of pretty long journeys ahead.

Thanks again,

Ged

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Hi Ged,

I haven't followed the complete thread from last time so sorry if I am repeating someone else!

I am presuming it is an electrical guage rather than a mechanical gauge?

Have you proven that the gauge isn't faulty?

Would it be worth rigging a cheap mechanical gauge in the cabin to confirm the symptoms or prove one way or the other?

Cheers

Grant

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Cheers Grant. I had thought about the gauge being faulty which was why i asked whether the pressure switch/light was independent of it. As Ralph said, the two work independently of each other so I presume that because the gauge reads low AND the light occasionally flickers then they are both most probably correct. The gauge is a mechanical one.

Thanks for your input,

Ged

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