What is normal oil pressure?

[goglio704]

Does anyone know what the normal oil pressure should be with the engine warm and idling? At speed? The reason I ask is that I have been told the 2.4 gas motors are prone to low oil pressure as they age, but I don't know how much the LD 28 has in common with the 2.4 when it comes to the oiling system.

[asavage]

This looks like one area where the FSM lets us down. I can't find a service spec for oil pressure at all from Nissan.

[philip]

This looks like one area where the FSM lets us down. I can't find a service spec for oil pressure at all from Nissan.

Al: Bear with me for I have no LD shop manual at hand.

Not all engines equipped with cooling oil spray jets (aimed up at the pistons) have a pressure check valve at each nozzle. Such engines ARE prone to low oil pressure due to these six bleed points when the oil is ... or has ... thinned, particularly when oil pump RPM is low.

If the oil cooling jets DO have minimum pressure check valves (like the SD's do), then the obvious things (stuck pressure relief valve, thin or thinned out oil, restricted oil pump inlet screen, etc) should be reviewed.

-Philip

[exmod110]

What are people getting as a hot idle press? in my rover with the ld28 on the hot days at idle it looks like the needle is sitting on or real near the pin @ 0 it comes up to 15 or so at 950-1000 rpm going down the road it sits up at 40 psi or so hot. cold down the road is mid 60's... the idle is aprox 650-725rpm. in another ld28 in another rover has sim press at idle but never drops below 5 psi. I have a mechanical gauge hooked to where the oem oil press sensor was, no telling how accurat it is. We are using the rec 15w40 oil in the summer. both are of the 82 vintage erra...
Don

[kassim503]

For my gasser I get about 5-7 psi hot, hotter it is the lower the psi for a 800 rpm idle. At 1100 rpm it pushes about 13, 2100 rpm does about 30 and 3000 rpm does about 35. This is with a brand new (8k mile old) oil pump

I have a mechanical gauge installed as a secondary gauge cause the factory elec. gauge is just so far off, so my readings should be almost on the dot.

The oil pressures may be similar between the diesel and the gasser, it does utilize the same pump and should have similar oil passages. Except for the vacuum pump and the injection pump oil feed.

[asavage]

Is the L24e and LD28 oil pump the same? I didn't think so. Someone want to track it down using FAST?

[kassim503]

I was told by the parts jockey at NAPA that the diesel model and gasoline model are the same PN

The one thing I did regret though, is I dropped 80 bucks on a non-turbo oil pump.

I'm dl'ing FAST now, see if it'll work with Vista, probably not.

[windsock]

Just installed a new VDO oil pressure gauge today into the OEM slot as a part of an instrument upgrade.

Cold idle = 15psi @ <40 Deg C
Hot idle = 25psi @ 60-80 Deg C
50kph (no tach but estimated at 1700-1800rpm) = 45-50psi @ 65 Deg C
90kph (estimated at 2900rpm) = 60psi @ 65 Deg C

EDIT: to include temperatures

Gauge shows pressure moving freely up and down with the revs - from whoa to go fast - 20psi to 60psi.

Cheers,

Phil

[240ZD]

I recently scored a 280zx turbo (automatic transmission) oil pump at a junkyard and bolted it onto my LD28. It raised up my average pressures significantly, by about 1/3. The gauge needle also does not sit alarmingly at zero when at hot idle anymore!

Zya, so in other words, if those crank pirates want to eviscerate the soft underbelly of our diesels only to harvest those sweet crankshafts, leaving a pile of pistons, rods, bolts and entrails in their wake, then we should fight fire with fire. Leave NO turbo oil pump untouched! May U-Pull-Its from sea to shining sea be stripped of their turbo oil pumps!

Furthermore, those flying the flag of Diesel should advance like the army of the Mongols through the junkyard battlefields, capturing every Borg Warner T5 spotted, seizing every 3:90 diff, harvesting all T3 exhaust manifolds.

Arise! Now my dismal host...RIDE! And may dark clouds of smoke issue forth from our clattering war chariots, heralding swift doom to the torqueless worshipers of the Plug of Spark, who wouldst forsake the wisdom of the Plug of Glow!

[goglio704]

^^^^I'll have what he's having^^^^

[mrtaquito85]

aa

[240ZD]

Well supposedly, the automatic transmission turbo oil pump moves an even greater volume of oil than the MT oil pump.