ChatterBox
SubscriberThe critical oil pressure for sufficient lubrication is at idle speed and maximum temps. So if the oil light isn’t flickering or coming on at idle, then you have more than the minimum required at the critical operating point.
The tests at the specific RPMs are to then confirm you are above the minimum on the pump curve at those RPMs and that the pump is performing as expected. As RPM goes up, both pressure and flow rates go up. As the oil gets hotter, pressure (resistance) drops but flow rates still increase.
As long as you don’t have some sort of internal bypass taking place, as indicated by the pressure tests at the specific RPM points, then the pump sounds like it is meeting the minimum pressures and flows needed.
Swaggie
The replacement pump has the same gear width as the original and the same gear to backplate gap of 0.06mm too, so presumably the same capacity and that the original wasn't measurably worn. I should have stuck with my earlier assessment that the pump wasn't worn but then convinced myself it worth replacing just in case it was.Originally Posted by BradC
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
ChatterBox
SubscriberUs early TDV6 owners are already onto our second oil pump. So no harm no foul.
Now you have an oil pump you can set up an experiment with.
Swaggie
Yes, I now know for sure that the pump is good whereas if it hadn't been changed then I would forever be wondering.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
Member
Picking up this old thread.
Graeme have you found out what was your problem for the low pressure oil on your TDV8?
I'm currently with the same problem on mine. Low pressures at high temperatures.
But mine has already had its engine out 3 times with a lot of parts replaced with new parts.
Listing the main ones: oil pum, main bearings, crankshaft.
Now we are trying with new rods.
We tried with 5w40 but the result was the same as you.
I am out of ideas now.
Swaggie
I concluded that the oil in use at the time didn't maintain its viscosity at higher temperatures so switched to a different brand of oil but didn't get to repeat the conditions whilst i had the car, which is now my son's. I also consder that with its engine-driven fan, the cooling system can't handle the heat produced by this engine when working at low revs so decided to keep the gearbox in a lower gear to keep the revs higher for increased airflow through the radiators. Even when not towing, on 35C days I would drop to 7th climbing hills at 100 kph.
I note that my L405 has lower gearing and doesn't have an engine-driven fan, so kinder to the engine than the TDV8 L322.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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