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Home > Help Needed / General Tech Chat > Strange oil pressure issue

minimole23

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Wiltshire

2nd Nov, 2008 at 09:17:29pm

Hi


If I leave the mini to stand for a week then start it the oil pressure builds very quickly, literally straight to 20psi at the turn of the key, then continues to rise fast.

However if the engine is even slightly warm after a long run, like today I drove it 70 miles to Bristol let it stand for 3 hours, then started it again. the oil pressure took ages to build.

If I start and stop the thing quickly it takes a little while to build properly as well when warm.

I changed the oil today to see if there was any crap (gasket sealent) in it that may be blocking the oil pickup and there wasn't.

What do you guy think could be going on here as I am concerned. my only thought could be that the pressure release spring is sticking and needs a week to settle properly.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

Vegard

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7765 Posts
Member #: 74
I pick holes in everything..

Chief ancient post excavator

Norway

2nd Nov, 2008 at 09:22:18pm

Hot oil vs. cold oil!

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.

minimole23

4309 Posts
Member #: 1321
Post Whore

Wiltshire

2nd Nov, 2008 at 09:27:00pm

It was very slow to build when the oil had become thicker again when it had stood for 3 hours

the oil pressure builds faster when say its 10 mins after a run, then in the example above 3 hours.

how long should I expect to get say, 40psi on a hot engine then?

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

PaulH

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1346 Posts
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Dublin Ireland

2nd Nov, 2008 at 09:50:20pm

on cranking 5 - 10 secons
engine start oil presure should rise
instantly

On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers.

______________________________________________________

minimole23

4309 Posts
Member #: 1321
Post Whore

Wiltshire

3rd Nov, 2008 at 07:20:40pm

Ok

I stopped and started the old girl today as I have been driving a fair bit.

This morning first start the oil pressure took ages to build. literally 10 seconds to get from 10-20 psi.

second start is built gradually but quickly say 10 seconds to 40 psi

third start I had 20 psi on the crankover instantly before it fired up, then rose rapidly to 60

Forth start, gradual again same as second start.

all were on level ground.

I'm now stumped, possible thoughts please.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

tadge44

3006 Posts
Member #: 2500
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Buckinghamshire

4th Nov, 2008 at 06:23:43am

I suggest that you try a different oil pressure guage.Also bleed the line from the engine to the guage - an air bubble in there can give all sorts of weird readings.Try all the simple things first before getting worried about tearing the engine apart.Different oil filter?

minimole23

4309 Posts
Member #: 1321
Post Whore

Wiltshire

4th Nov, 2008 at 08:53:51am




On 4th Nov, 2008 tadge44 said:
I suggest that you try a different oil pressure guage.Also bleed the line from the engine to the guage - an air bubble in there can give all sorts of weird readings.Try all the simple things first before getting worried about tearing the engine apart.Different oil filter?


I did think about the pressure guage and filter last night, I'll give them a go.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding

chinlesswonder

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In the garage......again!!

4th Nov, 2008 at 09:31:16am

sounds like crud in the capilary pipe or gauge, as above, try a different gauge and pipe.

133.5 bhp 123 lb torque 116mph @6640rpm 9.5psi
Shakespear RWYB 14.995 91.83mph

minimole23

4309 Posts
Member #: 1321
Post Whore

Wiltshire

7th May, 2009 at 07:34:33pm

I never did mention what was wrong.

All it needed was the capillary hose to the guage bleeding. Now the oil pressure shoots up.

On 7th Oct, 2010 5haneJ said:
yeah I gave it all a good prodding
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