oil pressure question
22 November 2009, 01:09 AM
#1
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oil pressure question
Just aq quick question for everyone. Just fitted defi oil pressure guage with the sender underneath alternator and it is showing my oil pressure as been 0 bar on idle and only read a maximum of 3 bar. First of all it read at 4 bar on driving and 2 on idle but then dropped after about 10 min driving. I no my rocker cover gasket has a slight leak and my bottom end nocking aswel but still driveable till rebuild next year, would thease affect the pressure or could it be sensor needs tightening in a little bit more not had chance to check leaks yet as it was dark by time i got back home. Any help would be appreciated.
Andy
Andy
22 November 2009, 08:12 AM
#4
You`d have to have 1 BIG BIG leak to get 0 bar !!!
The sensor could need tightening in more but again,it would have to be only screwed in 1 or 2 threads to get a poor reading, the amount of pressure that hole has the oil would still reach the sender/sensor
i had this issue on an old old cooled gixer,tried 2 sendor units and a different dial, all read the same low readings, then the conrod popped thru the block !
not saying yours is that bad tho,but re-do it all and try again,good luck,sure its gonna be somethign simple,it usually is
The sensor could need tightening in more but again,it would have to be only screwed in 1 or 2 threads to get a poor reading, the amount of pressure that hole has the oil would still reach the sender/sensor
i had this issue on an old old cooled gixer,tried 2 sendor units and a different dial, all read the same low readings, then the conrod popped thru the block !
not saying yours is that bad tho,but re-do it all and try again,good luck,sure its gonna be somethign simple,it usually is
22 November 2009, 11:04 AM
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As said , have you used PTFE tape on the thread?
Mine when the cylinders and piston rings were fooked was reading 4-4.5 bar when on the move and 2 bar when idle
Mine now reads around 2.5-3 bar at idle and then between 6-7 bar when moving since the rebuild
Mine when the cylinders and piston rings were fooked was reading 4-4.5 bar when on the move and 2 bar when idle
Mine now reads around 2.5-3 bar at idle and then between 6-7 bar when moving since the rebuild
Last edited by DannyBoy007; 22 November 2009 at 11:05 AM.
22 November 2009, 11:10 AM
#7
Engines knocking and your still driving? That's not good full stop mate, you could do a lot more damage which will render your complete engine useless.
As the guys have said above make sure you use teflon tape and check for tightness.
I would say Your main bearings have gone, hence why you now have oil pressure issues. My mate did what your doing i.e. running the engine when knocking and once i stripped it down it had chewed everything and ended up with a replacement engine.
As the guys have said above make sure you use teflon tape and check for tightness.
I would say Your main bearings have gone, hence why you now have oil pressure issues. My mate did what your doing i.e. running the engine when knocking and once i stripped it down it had chewed everything and ended up with a replacement engine.
Last edited by STI_Baly; 22 November 2009 at 11:21 AM.
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22 November 2009, 12:04 PM
#10
As said, a leak at the sender unit would have to be massive to loose that much pressure and would certainly be very noticable.
I assume the oil pressure warning light sender was discarded? That would have confirmed the zero idle reading!
JohnD
22 November 2009, 12:43 PM
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Condition of cylinders and rings would have no effect on oil pressure. You must have had new bearings and/or pump to see higher pressure.
As said, a leak at the sender unit would have to be massive to loose that much pressure and would certainly be very noticable.
I assume the oil pressure warning light sender was discarded? That would have confirmed the zero idle reading!
JohnD
As said, a leak at the sender unit would have to be massive to loose that much pressure and would certainly be very noticable.
I assume the oil pressure warning light sender was discarded? That would have confirmed the zero idle reading!
JohnD
22 November 2009, 02:01 PM
#12
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Condition of cylinders and rings would have no effect on oil pressure. You must have had new bearings and/or pump to see higher pressure.
As said, a leak at the sender unit would have to be massive to loose that much pressure and would certainly be very noticable.
I assume the oil pressure warning light sender was discarded? That would have confirmed the zero idle reading!
JohnD
As said, a leak at the sender unit would have to be massive to loose that much pressure and would certainly be very noticable.
I assume the oil pressure warning light sender was discarded? That would have confirmed the zero idle reading!
JohnD
Andy
22 November 2009, 07:23 PM
#13
Andy, i don't know who said this mate but it's not really accurate advice. Basically mate as long as your engine is running it will continue to excessively wear out what ever comes in its way. Possibly leading to major breakages and ultimate engine scrappage
you said it was discarded but then contradicted saying it was still there, just not connected? 
please clarify mate.
22 November 2009, 07:43 PM
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Once it starts knocking it's only a matter of time. Caning it will hasten the end, but nursing it will not make it last till next year, unless you do an amazingly low mileage.
Leaking rocker cover gasket will have NO EFFECT on oil presure. A rattling big end will have an effect but zero oil pressure is drastic.
By the way I have had two engines rattle to death. Get an old banger to run around in now before you get inconvenienced. Good luck....
Leaking rocker cover gasket will have NO EFFECT on oil presure. A rattling big end will have an effect but zero oil pressure is drastic.
By the way I have had two engines rattle to death. Get an old banger to run around in now before you get inconvenienced. Good luck....
23 November 2009, 08:35 AM
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Incorrect reading can be caused when the sensors dont make a good earth with the block, which often happens when using ptfe or the like> try as a temp measure giving the sensors a seperate earth to eliminate this problem.
On a different note if its knocking, pressure will probably be all over the place and its unlikely the engines going to keep running for long>
On a different note if its knocking, pressure will probably be all over the place and its unlikely the engines going to keep running for long>
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