NegevLandRover Posted April 24, 2009 Share Posted April 24, 2009 LR Defender 300 TDI. Did a 40'000 KM service - all oils and filters etc. Nothing out of the ordinary happened. Also put in a brand new Ali radiator, second hand intercooler, brake servo and pump and rear brake pads - all went well here too. Took the LR out for a whizz to see all was OK - no problems at all. Then started a longer drive - 20 kms down the road - engine temp fine, lotsa power (old intercooler was in a mess) and suddenly oil pressure light starts to glow dimly. Clutch in, free wheel down the highway and light becomes brighter, next exit just down the road so gently does it and light dims abit but stays there. Pressure unit is a after market one that is more sensative than orignal and comes on at 5 instead of 15 PSI so when the engine is hot if you are in neutral the light will come on - this way even during a long days work with engine on the whole time you get indications through out the day that the unit is working and if the pipes burst you get an earlier warning than you would with the original so the fact that the light came on was a heads up but still not a sign that all was lost. Crawl under LR and checked the unit was properly conected, no oil leaks, oil level correct, change the oil pressure unit. Get back in LR and start her up - all looks fine - open ignition light comes on, start up and in tick over light is on (as I said above this is normal with the unit I have), turn revs up and the light goes out. Back onto highway and a few kms down the road repaly of the whole scenario but much sooner than the first time (engine was warmer to begin with). Open the oil rad pipes and there seems to be very little oil in the rad but pipes are clear as is rad. Take out oil thermostat and it is jammed in the extended position (open - right ??) Put everything but the oil thermostst back in and re-start - everything is back to normal. Drive 180 kms and everything is fine. So what the hell was wrong ??? I presume that the oil thermostat works like the coolant one and when open allows the oil to course through the oil rad ?? Or is it one of these "normally open" systems - when the thermostat opens it actually closes one of the paths and sends the oil around the rad ?? OPTIONS Oil thermostat was the problem ? Air blockage in the oil rad/pipes ? (never heard of this before) GREMLINS ?? Opinions please. TIA Adam Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.