Oil pressure light flickering at idle

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Originally Posted by justinc

hey arthur, don't forget the pressure relief valve seat may be damaged or the plunger is not seating, this will cause the same symptom, no or low oil pressure at low engine speeds. doesn't take much, i had a td5 with this issue turned out to have a tiny flake of alloy swarf from when the oil galleries were machined out of the ally brace/ oil pump support assembly stuck under the plunger. a pick and a torch and all is good:)

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Hi Justin

I might call down today and bash you with it!!

Ear bash that is!! :D:D:D I'll have a look at that green wreck as well.

Catch you later R-Far
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Had exactly the same problem with my 200TDI , so after fitting a mechanical pressure gauge , sure enough there was NO oil pressure at Idle ,Engine Hot!Cold okay 15psi)
The Hotter it got the less the Idle oil pressure .So obviously a loss of pressure in the Lube system somewher.
Chenge Bigends, changed Mains ,new oil pump , all bearings and pump in amazingly good condition for 300,000 (Remember its a 200TDI not a POS 300TDI)
So after all that didnt improve the NO oil pressure problem at idle at all.
Again remove sump ,check a;ll bearing clearances ,all good as new !
Then , Noticed this heavy oil run back stain at the rear RHS of block .
Yep.rear Cam Bearing had Travelled out of bore , and probably rotated as well
To fix,pull engine ,total strip down Cam bearing replacement !
Nah , crank the idle up to 1500 RPM and ignore light !!!
For the 300 ,as the man said ,check bigends and mains ! after you verified the switch is okay.