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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
  
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| Oil pressure light - Came up and now disapeared ??? |
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Hi,
I have just experienced a strange notice with my 2005 D3.
I recently rebuilt completely the engine, starting with a bare block.
The previous engine was broken (rotating big-end bearings).
I have now drove about 500 km with this rebuilt engine.
Last weekend, I change the oil filter for a Britpart one. I wanted to have a new filter since the engine was rebuilt from new. Just in case there was any debrits in it.
Filter was clean.
After this filter change, I went for a drive in a nearby mountain road. It was a 800m uphill drive, which I drove quite quickly.
Almost at the end of the drive, I saw the engine oil pressure bulb flickering. I stopped immediately. Once stopped, the oil pressure bulb was constantly on.
I stopped the engine, checked the oil level. It was ok.
I checked the oil pressure switch plug. It seemed ok.
I started again the engine, it showed fixed oil pressure bulb.
I parked the car and towed it home.
Once home, I measured the oil pressure. With the engine cold, it showed 2 bars at idle speed & 5 bar at 3500 rpm.
I put the engine oil pressure switch back on.
Engine seems to be running normal. No special noise, banging or other.
=> Do you have any such experience ?
What could be the failing system : oil pump, engine, oil pressure switch, wiring, any other ???
Thanks for your ideas / experience sharing ! D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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 22nd Jul 2020 8:55 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10359
 
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there are 1 or 2 instances of wiring or dash problems causing the light to be on,
for example :
https://www.disco3.co.uk/forum/d3-27-oil-p...l+pressure
Maybe you should fit your own bulb between oil pressure sw and cigar lighter +
If the dash light comes on, without the extra light, you know its not a real issue.
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| 22nd Jul 2020 9:04 pm |
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KostasA
Member Since: 23 Aug 2015
Location: nairobi
Posts: 286
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Try and measure also the engine hot. Mine was 2/5 bar cold and then hot was very low.
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| 23rd Jul 2020 8:02 am |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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Hi guy's and thanks for the prompt reply.
I had the issue with the engine indeed hot.
I was driving quite fast on a long mountain road. I did not measure the oil temperature at that time.
It was also a hypothesis I had that the oil was very hot and very fluid, leading to more internal leaks and a lower oil pressure.
Then, I have 2 questions :
- What is the normal oil temperature range (on a nice and flat road & driving like mad on a mountain road & loaded) ?
- Did anyone allready installed a separate oil pressure gauge on top of the oil pressure switch ?
I found this one from a french supplier that looks useful :
https://www.mecatechnic.com/fr-FR/manometr...B09500.htm D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 8:56 am |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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KostasA wrote:Try and measure also the engine hot. Mine was 2/5 bar cold and then hot was very low.
OK, I will measure it also hot.
What did you do to solve your problem ? D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 9:02 am |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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Pete K wrote:there are 1 or 2 instances of wiring or dash problems causing the light to be on,
for example :
https://www.disco3.co.uk/forum/d3-27-oil-p...l+pressure
Maybe you should fit your own bulb between oil pressure sw and cigar lighter +
If the dash light comes on, without the extra light, you know its not a real issue.
Thanks Pete K, I will do that.
Do you suggest to install diods to isolate both circuits and avoid shorts between the dash and the cigar lighter ? D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 9:04 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10359
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Yes you could  if you know what you are doing.
That way as soon as the light comes on again, you will know if its a genuine oil problem or not
Last edited by Pete K on 23rd Jul 2020 10:18 am. Edited 1 time in total
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| 23rd Jul 2020 9:32 am |
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KostasA
Member Since: 23 Aug 2015
Location: nairobi
Posts: 286
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pigeon_voyageur wrote:KostasA wrote:Try and measure also the engine hot. Mine was 2/5 bar cold and then hot was very low.
OK, I will measure it also hot.
What did you do to solve your problem ?
nothing much, just lost my crankshaft.....
Never found the cause of it. engine was rebuild, oil changes every 3.000 miles always good quality filters and oil.
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| 23rd Jul 2020 10:39 am |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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Disco_Mikey wrote:Ditch the Britpart filter, and fit an OEM/Genuine part
Agreed Mikey ! D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 5:10 pm |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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KostasA wrote:pigeon_voyageur wrote:KostasA wrote:Try and measure also the engine hot. Mine was 2/5 bar cold and then hot was very low.
OK, I will measure it also hot.
What did you do to solve your problem ?
nothing much, just lost my crankshaft.....
Never found the cause of it. engine was rebuild, oil changes every 3.000 miles always good quality filters and oil.
Arghhh... Broken engine is a painful bill ! D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 5:10 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
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The oil light was one of the symptoms mentioned in the repair guide for leaking A pillar trims
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| 23rd Jul 2020 6:32 pm |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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pigeon_voyageur wrote:KostasA wrote:Try and measure also the engine hot. Mine was 2/5 bar cold and then hot was very low.
OK, I will measure it also hot.
What did you do to solve your problem ?
Hi Kostas,
Oil pressure measured tonight with warm engine.
Oil temperature : 90°C, coolant temperature : 80°C.
Oil pressure at idle : ??? low ??? My gauge needle barely move.
I had no red oil pressure warning light.
Oil pressure at 3500 rpm : ??? 1-2 bars, quickly fluctuating.
What pressure did you read when you measured it ? D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 8:54 pm |
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pigeon_voyageur
Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 85
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aja4x4 wrote:The oil light was one of the symptoms mentioned in the repair guide for leaking A pillar trims
Hi Aja4x4,
What post did you mention ?
I have not found this one ?! D3 TDV6 for holidays use,
RR L322 3.6 TDV8 daily car,
D3 TDV6 (rebuilt engine - for sale),
RR P38 for sale,
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| 23rd Jul 2020 9:00 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10359
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Minimum spec
0.50 bar (7.25 psi) at idle
1.0 bar (14.5 psi) @ and above 2,500 rev
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| 23rd Jul 2020 9:12 pm |
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