300tdi time for oil pressure - Defender Source
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  #1  
Old April 10th, 2015, 01:38 PM
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300tdi time for oil pressure

Hi everyone,

Quick question (hopefully) - my 300tdi I takes about 3-5 seconds after starting for the oil pressure light to go out on first start. After it's run and turned off oil pressure light goes out immediately after starting again. Normal, problem, likely cause?
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  #2  
Old April 10th, 2015, 02:47 PM
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What weight oil are you using ?
How cold is your ambient air temperature where the vehicle is parked over night ?
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Old April 10th, 2015, 02:50 PM
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I currently have 0w40 in there, right now it's typically 0-5C overnight, generally colder prior to April (-10 to -25C).

Time to change to a 10w40?
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Old April 10th, 2015, 03:35 PM
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What filter are you using? You should try to use one with an anti drain back valve or flap.
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Old April 10th, 2015, 03:38 PM
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I have a factory land rover filter. The release at the bottom of some filters is a bypass in case the filter becomes clogged etc.
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Old April 10th, 2015, 03:58 PM
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I will say that is not normal. You are either having a drain back issue or your oil pressure is marginal all of the time. I would at least temporarily hook up a oil pressure gauge to see which it is.
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Old April 10th, 2015, 04:42 PM
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Guess I'm ordering a pressure gauge. M10x1 for the sender unit right?
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Old April 10th, 2015, 05:01 PM
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Yep you got it
Robert had a great thread on this:
http://www.defendersource.com/forum/...uge-60823.html
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Old April 11th, 2015, 03:08 PM
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My oil pressure light was coming on at low RPM. So changed the sender unit. After that OK. I know that does not directly coincide with your problem, but another thing to consider. Cheap and easy to fit....
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Old April 11th, 2015, 03:31 PM
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Yea, I ordered a vdo oil pressure gauge that comes with a warning contact as well. With that said I haven't been able to find any reference as to what the stock warning contact lights up. Vdo had 5, 7, and 12psi - anyone know what the stock cut off warning pressure is?
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  #11  
Old April 11th, 2015, 03:43 PM
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The only reference I found, 7 psi, PRC 6387,UNIPART PRC6387 Oil Pressure Switch for LAND ROVER,FORD
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Old April 11th, 2015, 03:48 PM
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That's great, by dumb luck I got the right one. I figured the engine is 20-50psi so anything lower than that should work.

Cheers.
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Old April 15th, 2015, 09:41 AM
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So, oil pressure gauge showed up and installed. Oil pressure itself is great, up to ~55psi cold, warm it runs around 30psi at idle, up to 50 psi by ~1200 rpm (no tach).

However, as you can see in the videos posted, on cold start there is a delay in oil pressure coming up. One other item I noticed was that the oil level if I check in the morning it seems ~ 300mL high, after running and letting it sit for awhile it's still at the full mark, but by morning it's high again which seems to point to some drain-back through the oil pump with the million dollar question being why.

Watching the video again, it seems it's only about 2 seconds to build pressure though it's still a bit concerning.

Cheers.
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