Tim
1850 posts
Joined: 18/10/2004 09:40:59
Location: Bournemouth United Kingdom (Excluding channel Islands)
OIL PRESSURE DROP
Oh dear, that's way too low. Has it just started doing this or is it a gradual thing that's come on over time? Have you changed the oil and filter recently? Are you using the right oil - it must be 20w50 mineral oil, nothing else. It won't hurt to change the ball and spring pressure relief valve but if that doesn't do the trick you could be looking at new bearings and/or oil pressure pump
Posted: Aug 22, 2011 09:07 AM
paslow22
24 posts
Joined: 03/12/2012 07:18:14
Location: Hamlyn Terrace NSW Australia
Dry Oil Filter
I didn't know the filter was horizontal on an spi! You live and learn.
This is only the case with later Japan models, as the never introduced the MPi to the Japan market for type approval reasons. Instead they built something of a "hybrid". Completely MPi technic, except for the fueling system.
MPi block with MPi ignition, combined with SPi fueling.
@ paslow22:
Are you sure that there´s no reliev valve installed? It´s not in the filter port. It´s located somewhat down left of the filter, near the oil pressure switch, under a domed cap nut.
Without reliev valve, the engine would not build up oil pressure at all...
The oil would bypass the filter directly to the sump and of course also drain back out of the filter.
Cheers, Diddi
Hello, With reference to the dry oil filter and the missing relief valve, well when I was removing the oil filter I placed rags under the filter to catch the oil drips.
I then undid the nut on the left of the filter and there was nothing in there just a oil gallery, so then I'm thinking no relief valve.
After removing the rags I then found that I had covered up another nut under the first one it is down beside the starter motor and hard to see, and after removing the starter motor removed the nut and found the missing relief valve.
Not stuck, it came out very easy it looked new with no score marks at all, I than checked the spring length it was 71mm I think and it was supposed to be 72.5 so in the interim I put a washer under the spring and replaced it and ran the motor for a short time and rechecked the oil filter and now I have oil in the filter which was a great relief.
I have again checked the oil filter today and the filter is full of oil, the new pressure spring arrived and will now be changed along with fitting an oil pressure gauge just to be on the safe side.
Thanks for all the help.
Darryl.
Posted: Jan 29, 2015 09:23 AM
Gavin
20 posts
Joined: 16/09/2004 08:47:07
Location: Ashford United Kingdom (Excluding channel Islands)
Oil Pressure
I had the same problem with my 1293. Turned out to be a worn oil pump. Fitted a Turbo pump, and has run at about 50 PSI ever since (30 PSI after a good thrashing). I too had checked everything, changing pressure reilef valves, filters, oil, and ended up on the pump. Long winded, and really hacks you off, as you need to change the oil and filter yet again to do the pump! You can change an oil pump in three or four hours, if you have a good temperment, (little bit tight in the engine bay!). I managed to do it with the engine still in the car, although it was a squeeze. One other thought though. I HIGHLY recommend that you remove the pressure relief valve spring and cap and replace the cap with one of the ball bearings from a CV joint (fits perfect). This will prevent it from sticking period.
Posted: Dec 08, 2004 01:25 PM
Leebex
1 posts
Joined: 02/01/2011 21:25:39
Location: Chesterfield United Kingdom (Excluding channel Islands)
Oil pressure relief valve
Hi, I have a 1985 mini with the 998 engine. I recently replaced the oil pressure relief valve with the ball and spring kit from minispares. my question is, should it have been quite difficult to fit? what I mean is that I had to push with quite a bit of pressure to compress the spring whilst starting the nut. the orange light has gone off on the dash but the car has no oil pressure gauge so want to make sure its ok.
Posted: Mar 01, 2017 11:50 AM
ickle
16 posts
Joined: 27/03/2005 15:14:40
Location: Maidstone United Kingdom (Excluding channel Islands)
No oil pressure on rebuilt engine...
Yep, oil all over the place and the oil pump was primed beforehand so it isn't that.
The only place we can't see any trace of the stuff is in the pipe or block union for the oil pressure guage.
I'm suspecting a sticking plunger so have ordered a ball and spring for the relief valve - short of this I can't think of anything else.
Posted: Feb 20, 2008 12:25 PM
Barry Brown
511 posts
Joined: 23/06/2008 12:08:31
Location: New Barn United Kingdom (Excluding channel Islands)
low oil pressure. HELP!!!
ive fitted all new bearings, oil pressure switch and oil pump. Ive also fitted the ball bearin insted of the bullit type oil pressure valve (havent changed the spring tho??). its ok on start up but after a few miles or a motor way blast, it comes on jus under 2000rpm.
The relief spring should work cold or hot so i doubt it is that but a stuck spring isn't unheard of. This is more suggestive that the oil may be getting too hot and thin or something is causing loss of pressure when warm. Have you changed the filter/cartridge again? Do you have an oil cooler and does it have a thermostat? If so it could be an airlock in the oil cooler which causes pressure drop when the thermostat opens. Or you could have a cooler pipe that is kinking or collapsing under heat because it is curved too tightly.
Is your crankcase ventilating properly? There is a possibility that it is building up pressure and blowing the oil back out of the galleries once it warms up and preventing it getting to the sender unit.
I agree that a proper gauge is the way to go. Most sender units only come on at around 10-15psi by which time the engine is cream crackered, especially if it has been tweaked.
Posted: Oct 20, 2009 02:34 PM