no oil pressure after oil change
Hi all
After changing oil (250GD) (engine was sitting for a long time with no oil in it-pump dry?), when started, yes it has plenty of oil, it doesn't seem to be sucking the oil to produce pressure. After removing filter housing top it's still dry in there, I then filled the filter housing to try and prime it but no luck. Any suggestions?
Thanks Scott
Hi you probably need to prime the "galleries" with a pump type oil can... normally done by removing the oil pressure switch and pumping the oil to the upper side of the oil pump to get rid of the airlock.....after doing this if you turn the engine over with the starter oil should spurt from the pressure switch port... screw the switch back in at the same time....
Hi did you fit a new oil filter? and the correct one!! the two small "o" rings can cause oil pressure problems and you say the oil fillter bowl is empty.which could be an indication that the oil pump is still sucking air....
yes I did fit a new filter, I'm pretty certain it's correct. The 2 small 'O' rings I renewed. I can't see how the pump would be air locked, I pumped oil in at 20psi which must have flooded everything including back through the pump. I'm beginning to wonder whether it's something to do with filter/ O rings, can't see why but there's nothing else I've touched. Do you know if when buying a genuine filter it comes with the 2 small 'O' rings. Thanks for your help.
Hi yes they are with the filter cartridge plus a big one for the top of the filter chamber..the OM 617 filter as fitted to the car is different to the G wagon which is longer.I am not familiar with the OM 602 engine filters! car or G'wagen but have an ETL manufacturer part number EOF-011 for the G'wagen which is part metal with a cardboard section at the bottom suitable for the OM 602-930 and 932 model engines
thanks again. I think I'll try filter/o rings, can't see what it will do but no choice. Of course I'm afraid to start it now, just hope nothing has been damaged at this stage. Any thing else you can think of I'd appreciate. Cheers Scott
t Of course I'm afraid to start it now, just hope nothing has been damaged at this stage.
How about disconnecting the fuel line and even remove injectors/glowplugs so that you can turn it over on the starter without this worry?
yes I have thought of that, will probably have to if nothing obvious comes up. Cheers
I really just need to know if there's something obvious and peculiar to these engines that I'm missing. I've never come across this before, it's got me completely stuck. The obvious points to filter/o rings as that's all I've changed but really don't think so.
OK every one, I still have no oil pressure! Does any one know whether the 2 valves in the filter housing can cause problems? Any one ever heard of pump drive or pump itself failing? Can the engine sump be removed with the gearbox in situ? Thanks again. Scott
Hi Scott reading your various posts...why was it stored without oil and for how long....I have experience of oil gelling in the sump pan in hot climates ..on a normal drain you never get it all out...it turns to a tarlike consistency which does not blend or emulsify with new oil...a flushing oil sometimes does the trick but removal of the sump pan is a more positive way to go...if the galleries are blocked its back to the pressure blow out again...running it could lead to main and bigend bearing metal picking up on the crankshaft...then its a complete strip down......
Hello. It has been up on blocks for a few months now as I'm doing the body work. I drained the oil then didn't have any oil to put in it for a while, hence the reason it stood for a while (about 5 or 6 weeks). I have thought about the pick up being blocked for some reason. I used to work on some Jap diesels that were really bad for making the oil sludgy and blocking things. When I drained the G though the oil was fine. Cheers Scott
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Thank you! I've done that, pressurised oil into switch hole, about 3 litres worth to make sure it got every where, still no oil pressure! I'm stumped, it was working perfectly before. It's not the oil pressure switch. With the switch out, it doesn't pump oil. Is there a one way valve somewhere? When I open the oil filter housing, it is almost empty, is this normal? Any ideas? This has me worried! Cheers Scott