Help Low oil Pressure Jackaroo 92 3.1TDI

Submitted: Sunday, Dec 29, 2002 at 01:00
ThreadID: 2728 Views:1805 Replies:3 FollowUps:2
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I Have a 1992 intercooled Jackaroo which for some time has had alow oil pressure problem.. The oil pressure is normal except on hot days ie above 30 Deg. On hot days the oil pressure will reduce up to half, espually after higher speeds or hill climbs.. The lack of oil pressure seems to be un-related to the engine temprature... for example after a long hill climb when going back down the motor temp drops to normal or just bellow however the oil pressure stays low....
Can any one HELP
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Reply By: Goodsy - Sunday, Dec 29, 2002 at 01:00

Sunday, Dec 29, 2002 at 01:00
Oil pressure is a good indication to how hard your engine is working. And how well it is cooling. Have got a VDO oil pressure gauge on my hilux and oil pressure always drops before the temp gauge moves. I would check out your cooling system. If this passes all tests fit an after market oil cooler.
AnswerID: 10285

Follow Up By: Goodsy - Sunday, Dec 29, 2002 at 01:00

Sunday, Dec 29, 2002 at 01:00
Also check what oil you are using, this could also do it. Ozi would know more about that one.
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FollowupID: 5396

Reply By: geoff - Sunday, Dec 29, 2002 at 01:00

Sunday, Dec 29, 2002 at 01:00
Sparky - oil pressure is related to engine temprature you stated when you go down hill the engine temp drops but the oil pressure stays the same keep in mind when you go down a hill you have air to cool the water through the raditor and the oil takes longer to cool also when the oil gets hot it thins out and if you have excess clearance in you bearing thoughout the motor you will not have any resistance to the oil therefore the oil will flow quicker through the bearing being thinner due to it being hot. check to see if the oil is correct for that engine - this is a reference taken out of a manual If the oil pump or relief valve are faulty. low pressure will be indicated with the engine both hot and cold. However, if the bearings are at fault a fairly high oil pressure will be indicated when the engine is cold but a marked fall in pressure will be noted when the engine is hot. I would first try changing the oil then if that does not work I would check to make sure that the oil is being cooled successfully if that fails I would try having the oil pump reconditioned I hope that is of some help

Regards Geoff
AnswerID: 10292

Follow Up By: Sparky - Monday, Dec 30, 2002 at 01:00

Monday, Dec 30, 2002 at 01:00
Thankyou for your help - the jackaroo has done 250k km and I have tried various oils - suspected the oil cooler at first but the motor has always had clean oils & coolants so I suspect the oil cooler wouldn't block up. Probably you and eric have the it right and I should check the crank shaft bearings...
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FollowupID: 5408

Reply By: Eric - Sunday, Dec 29, 2002 at 01:00

Sunday, Dec 29, 2002 at 01:00
Sparky.
You dont mention how many ks the jack has done. if it is more than 200k the motor is probably a bit worn, but still ok, if you use a multigrade oil it will be good for many more ks. If the pressure drop bothers you drop the sump and fit a new set of bearings, the bearings should be under $100,from a engine parts specialist. Cheaper than the other options.
Eric.
AnswerID: 10295

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