NO OIL PRESSURE ...SOB

[banditman]

Any ideas guys ?

Carb V8

Fitted with filter mod kit which point filter forwards in a Landy....

No oil pressure........

remove dizzy and spin oil pump with drill...........got pressure

Refit and start...................got pressure.......

Run ten minutes, pressure goes.........

repeat, and same again................

Doing me head in !!!!!!!!!!!!!!!!!!!!!

[Sharpshooter]

Sounds like the pump is knackered. Running when oil and engine cold, thicker oil and pressure.

10 mins later.

Engine warms, thinner oil, and passing the pump. :(

[Range Rover Blues]

so check the pump, the oil pressure release valve, al that kind of stuff.  When you wizz up the pump on a warm engine, do yo get the pressure back?  if so it could be the oil pump drive itslef is toasted.

[luffy]

Sounds to me like the pump or the pressure relief valve is worn and letting the warm thin oil to 'escape'.

It might also be worth changing the pressure switch as this may be being affected by the thinner oil.

[hobbit]

Sounds like the same prob on the lightweight, the oil pressure drops right off on tickover when warm, but reasonably ok on running

[Range Rover Blues]

Ah, what grade of oil are you using?

[banditman]

15w 40 RRB.....had to get it from Halfrauds on Sunday afternoon and that's what the book said.........is it wrong? (mind you, that's what's in my EFI Rangie too??)

I know it's not the gauge Luffy by the sound it started to make when it was reading nil

Off to check PR Valve and hope !!

Cheers guys

Martin

[Sharpshooter]

Right oil mate. :D

[banditman]

Kinda expected that Sharpshooter....couldn't possibly be the easiest thing to change that's causing my problem could it...... :lol:  :lol:  :lol:

It's a Land Rover thing :shock:

[Xtremeteam]

had that prob with the v8 racer & fired some halfrauds 20w50 & a tin of wynns oil adative into it & it cured it,only drops oil pressure when youve been raging it around the 5700-6k+ mark & its hot,disconected my oil light & watch the guage  :lol:

[Range Rover Blues]

If it was low oil pressure I'd suggest trying 20w/50, the second number is the viscosity hot and that's a noticeable drop, 50 to 40 but a new 15w/40 oil should be up to the job.  LR changed the spec partly because of the availability of 20w/50 and partly because modern manufacturing allowed the use of thinner oils with no detriment.  AnyV8 can run on20w/50 and that's what I recommend when available.

However, I don't think that's going to solve your problems.  Fingers crossed it's the PRV or wear in the oil pump, the condition of the pump cover will give you an idea.  When replacing the pump cover, fill the pump with vaseline to prime the pump.

If it's not a problem there you could have very severe wear on the crank/big ends, only allowing the pressure to drop as the engine turns.  This would explain why you can get the pressure back up with your drill attachment.  That would mean at the least dropping the sump and shells out to check, possibly then a regrind depending on what you find.  For a 3.5 you'd be as well off buying a S/H runner, even if you opt to rebuild that one at a later date.

So let's hope it's the pump then [-o<

[diesel_boy]

it can b 1 ov 2 fings    like some of the others  say ur p r v  or ur oil pump cover if it the valve just take it owt n clean it could b full of slugy type poo easy job  big nut on the side of ya pump  tek it out  n ull av a spring n ball bearin  then take off the oil pump cover  8-16point bolts  fidely sod's then look at the cover u got in ur hand if its scored up jus get  some emery cloth n rub it  down flat agine  cus the pumps dont  realy wear out its the cover  then fill ur pump wiv vasaleen n chuck it all back2gether  n watch ur oil pressure  go back up   n only use 20/50 in it  n ya wont go rong  been there done the got the t-shirt