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Oil pressure dropping
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Author:  petermk1 [ Fri Mar 27, 2020 3:38 pm ]
Post subject:  Oil pressure dropping

G'day mini nerds,

I'm having an issue with the oil pressure on my 850 mk1 project, I've got a pressure gauge thet reads 50lb when the engine first starts up although as it gets a bit hotter and revs, it goes down to about 15-20lb. I have some air in the oil pressure line although I figure that if it starts high (50lb) this may not be the issue. Am I going to have to change my oil pump or is this just a matter of bleeding the oil pressure line.
I've attached photos.

Cheers mini maniacs.

Author:  timmy201 [ Fri Mar 27, 2020 3:44 pm ]
Post subject:  Re: Oil pressure dropping

The oil will always lose pressure as it heats up. My old engine had similar oil pressure readings at idle, it was just worn out and probably needed new bearings and oil pump.

It should increase the oil pressure with RPM, about 10psi per 1000rpm. Bleeding is not critical and will drive you bonkers

Author:  petermk1 [ Fri Mar 27, 2020 4:02 pm ]
Post subject:  Re: Oil pressure dropping

Awesome. Thank you mate. I'll keep an eye on it and make sure it doesn't go to 0. I still haven't given it a good run yet so hopefully it goes back up.

Thanks again

Author:  9YaTaH [ Fri Mar 27, 2020 4:09 pm ]
Post subject:  Re: Oil pressure dropping

What oil are you using? How long has it been in there?

Author:  petermk1 [ Fri Mar 27, 2020 4:31 pm ]
Post subject:  Re: Oil pressure dropping

I'm using a "gulf western" 20W-50 SN/CF and it's been in there for about 6 months but I've only turned it over about 5 times since putting it in

Author:  AWOODY [ Fri Mar 27, 2020 4:36 pm ]
Post subject:  Re: Oil pressure dropping

Try some HPR30 tends to hold its pressure once it heats up .

Author:  drmini in aust [ Fri Mar 27, 2020 4:41 pm ]
Post subject:  Re: Oil pressure dropping

Pressure that low it needs a rebuild.

Author:  petermk1 [ Fri Mar 27, 2020 4:43 pm ]
Post subject:  Re: Oil pressure dropping

Awesome. I'll try the HPR30 before going the rebuild route. Hopefully that holds it all together. Thanks guys

Author:  9YaTaH [ Fri Mar 27, 2020 6:06 pm ]
Post subject:  Re: Oil pressure dropping

drmini in aust wrote:
Pressure that low it needs a rebuild.


or an oil pump...

Author:  ausdino [ Fri Mar 27, 2020 7:25 pm ]
Post subject:  Re: Oil pressure dropping

or checked the accuracy of the oil pressure gauge.

Author:  Phil 850 [ Fri Mar 27, 2020 7:52 pm ]
Post subject:  Re: Oil pressure dropping

We had low oil pressure and a rebuild was recommended.
Pulled out the oil relief valve to find that it wasn’t seating properly.
Bought a new valve and spring , and bingo, all good.

Author:  petermk1 [ Sat Mar 28, 2020 4:18 pm ]
Post subject:  Re: Oil pressure dropping

This is all awesome stuff. Thank you guys. I changed the oil which helped a bit but it ended up back at 20 anyway. I will try all of this in the desperate attempt to avoid a rebuild.
You guys are the best.
Cheers again

Author:  Morris 1100 [ Sat Mar 28, 2020 4:29 pm ]
Post subject:  Re: Oil pressure dropping

Try the pressure relief valve.

Author:  petermk1 [ Sat Mar 28, 2020 4:36 pm ]
Post subject:  Re: Oil pressure dropping

I definitely will. I'll start looking at that tomorrow. This quarantine stuff is great for my mini

Author:  timmy201 [ Sat Mar 28, 2020 4:48 pm ]
Post subject:  Re: Oil pressure dropping

Mine lasted a couple of years with it that low. I changed to the 20/60 HPR and bumped up the idle to 1500rpm. Not recommend for long term health of the engine though :lol:

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