Thread: TDV8 oil pressure concerns

If built for Australia then it shouldn't have a DPF but might have one if built for another country where the DPF was required.
If the "muffler" immediately behind the join of the 2 engnie pipes is small then it's not a DPF as the DPF is quite large. A VIN decoder will also indicate if it was built with a DPF.

As the idle and maximum pressure now significantly exceed the specifications at oil temperature 65 degC and meet the specs at 85 degC, albeit with a gauge around 2 psi optimistic at 20 psi, I'll just ensure when towing especially in hot heather to use gears that keep the pressure half reasonable.
Oil temp was 91 today after the short PO run with pressures about the same as at 85 yesterday.

Originally Posted by Graeme

As the idle and maximum pressure now significantly exceed the specifications at oil temperature 65 degC and meet the specs at 85 degC, albeit with a gauge around 2 psi optimistic at 20 psi, I'll just ensure when towing especially in hot heather to use gears that keep the pressure half reasonable.
Oil temp was 91 today after the short PO run with pressures about the same as at 85 yesterday.

That’s a shame Graeme, thought you might have been onto something there with 5W40, but thanks for all the info, will definitely use the gears when towing to keep that pressure half reasonable as you said

A3/B4 5W40 is definitely an improvement for warmer climates. For a while I considered Penrite HPR 10W50 for a little more pressure due to its slightly higher 100 deg viscosity. However I wouldn't know if the extra pressure was due to less oil escaping from the bearings or more resistance travelling through the galleries, possibly resulting in less available to the bearings, so I'll stay with 5W40. I consider that 5W40 causing the hot pressure specs to be met in my climate is about as good as it needs to be.

My son with my old 3.0 D4 isn't so concerned as the 6-speed gearbox means that his engine is spinning at 2000 rpm at 100 kph so the pressure will be considerably better and his bearings less loaded.

I've decided to replace the pump, having ensured that the filter housing drain is blocked when the filter is fitted, pressed onto the spout without the cover fitted, held only by the friction of filter's internal o-ring. Oil dribbled into the area outside the filter until it overflows into the spout showed that the drain plug was adequately closed by the filter pressing on the plug's spring clip which when under pressure would be more inclined to seal, not less.
Maybe there won't be any pressure improvement, but hopefully there will be. I'll be taking a few measurements of both the new and the old.

Graeme wasn't there someone on Ffrr who was modifying his oil pump for greater pressure ? (I can't seem to locate it at the moment.) Did you see it, or find anything worthwhile from his post ?
Laurie

I don't recall seeing such a thread and haven't found any reference to problems with the 4.4's pump other than a few developing a weep from one of the plugs.

I think mine's issue is caused by excessive pump clearances rather than capacity because the cold/ambient pressures are excellent yet no smoke cold or hot so oil escaping from the bearings cannot be excessive. I'm just hoping that either my pump has been damaged, possibly by swarf when the twin drain was fitted by the selling dealer, or that the clearances have always been marginal.

I'm somewhat suspicious of LR's specs of 35 psi at 3000/3500 rpm with oil at 65 degC but unfortunately mine are the same at 95 degC with the 5W40 oil, unless the pressure is meant to be close to 35 at much lower revs whereas mine isn't. Today driving at 100 kph in 7th at 1600 rpm the pressure was under 20 psi - I cannot believe that is OK.

Edit: Last night I watched LRTime's video on the 3 TDV6 pumps so I now know the clearances on those pumps and the 4.4's should be similar. I'll get a new set of feeler gauges for the task.

"Today driving at 100 kph in 7th at 1600 rpm the pressure was under 20 psi - I cannot believe that is OK."

Totally agree...

Sorry if I missed it but where and how are you measuring the Psi? Is there a physical gauge being sighted?