Printable View
Quote:
Originally Posted by incisor
how did you go with this inc?
mine did this same thing yesterday, first time since fitting the adaptor,
all at 45 plus until the engine got hot, and yes, dropped to 20... 34 deg day and hotter in parts, but hasn't done that before, so the heat yesterday has triggered a vernatherm or something.
i took mine off...
it has something to do with having an oil cooler in the circuit so oil leaking past something in the adaptor can dissipate into that flow imho
i needed the vehicle so took it off till i needed something to torment me again...
I have had a look at a couple of my manuals and see that there is a vernatherm which would open to port oil to an oil cooler of in the circuit.
I don't understand why the oil pressure wouldn't also drop on the original engine these adapters came off, if ported to an oil cooler circuit, but I am working on it....
the 200 tdi and 300 tdi manuals do not give the temp at which the vernatherm opens, but I did notice that the oil pressure for a 200 tdi is 25 to 55 , so 20 for our engines probably isn't a big problem.
I think from memory an old holden was about 15 min when hot.
I will pull the vernatherm off and see what we can do to prevent it opening, and also look into fitting an oil cooler, although I don't believe the engine needs one.
there must have been thousands of these engines pumped into out hot aussie world, so I dont think I need to change anything.
ok, I think I have sorted this problem out.
I have the modern oil filter adapter on the bench at work and have been through the porting of the system, if the adaptor was ported through an oil cooler there would be no problem and also if the engine oil doesn't get very hot the system will operate as normal.
but when the oil gets hot the vernatherm in the adaptor opens to port oil through the oil cooler,
in my case I do not have an oil cooler and these ports are blanked.
so when the vernatherm opens, it also restricts oil flow back to crankcase, trying to send all the oil to the cooler.
so when we do not have a cooler the oil flow is restricted and this causes the oil pressure relief valve in the engine to open, dropping the pressure to 20 psi.
the cure is to either fit an oil cooler or remove the vernatherm , washer and spring from the modern adaptor.
I hope this solves this problem for others.
that is where i thought it would end up..Quote:
Originally Posted by harry
thanks harry, appreciate the effort...
Hello again.
Thanks for the useful advice.
As mentioned in an earlier post, I got my adapter from a wreck with a 2.5 litre motor in Africa - these were the same basic block as the 2.25 litre motor and had the spin on filter but no oil cooler. All reports were that they worked just fine, and much cheaper than the Rocky Mountain units or new part from Land Rover, which seems to be the case as long as they are fitted correctly.
I had heard that the same adapter unit from the later motors was also OK fitwise, but a few posts here and there were suggesting the sorts of problems that you have been encountering. Nice to know the underlying cause of the problems and scope for economic resolution.
Cheers,