Austin Ten Drivers Club

Welcome to the Austin Ten Drivers Club Forums!

You are not logged in.

#1 2015-01-13 18:10:51

David Kewley
Guest

1932 Austin 10/4 oil pressure

What is the correct oil pressure for an Austin 10/4 and should it vary with revs. Is 30psi at tick over hot and cold an indication of a problem?

#2 2015-01-13 20:16:33

6350_William_French
Members
From: North Shields, Tyne and Wear
Registered: 2013-01-04
Posts: 424

Re: 1932 Austin 10/4 oil pressure

Hi David

Your 30psi oil pressure is fine at about 35 - 40 mph.  The oil pressure relief valve must have been set at 30 psi.  However 30 psi at at tickover when the oil is hot is a bit puzzling.  Normally I would expect the oil pressure to drop to about 15psi at tickover when the oil is hot.
Are you sure that the oil is really hot. It probably takes about 30mins of driving for the oil to become really hot!
Or your bearing oil clearances are very good!

From  Bill


You buy a car,  But you invest in an Austin

Offline

#3 2015-01-13 21:09:51

David Kewley
Guest

Re: 1932 Austin 10/4 oil pressure

Thanks Bill. Maybe oil wasn't very hot but nothing to worry about then.

#4 2018-08-08 08:44:26

Trevor Lund
Guest

Re: 1932 Austin 10/4 oil pressure

Hi both,

I have a similar problem until recently the oul pressure gauge acted a bit like a revcounter increasing and decreasing with the engine revs but whilst away in Belgium in her last month the gauge started reading a steady 28psi until the engine is switched off. Interestingly we hit a speed bump a bit hard just after this started happening and the gauge started reading normally again for a few miles.

Since returning home I have cleared the feed to the gauge using the airline and run the engine briefly with the oil union to the gauge disconnected to see what the engine pushed out (a bit black and sluggish) but the engine was cold so that would have an effect.

Any thoughts on where to look next?

Trevor

#5 2018-08-08 19:32:53

6350_William_French
Members
From: North Shields, Tyne and Wear
Registered: 2013-01-04
Posts: 424

Re: 1932 Austin 10/4 oil pressure

Hi Trevor
Just sounds like a sticking pressure gauge to me.  You can by new ones fairly cheaply or remove the pressure gauge and give the internals a good clean with a cleaning fluid or petrol.
Regards from Bill French


You buy a car,  But you invest in an Austin

Offline

#6 2018-08-08 22:05:07

8565_Michael_Love
Members
Registered: 2015-07-30
Posts: 225

Re: 1932 Austin 10/4 oil pressure

Hi Trevor,

Sounds like something may have moved in your tube to your gauge possibly restricting it, or causing the gauge to stick. If it was dirty when you disconnected the gauge it may be time to give your oil ways a good clean through as Bill has said, and possibly an oil change. When did you last drop the sump and clean it & the gauze strainer, and how much sludge was in there?

As it is relatively easy to do, it might also be worth checking the oil pressure relief ball and spring if your pressure is dropping very low at tick over as it may be letting oil past it. They are relatively cheap and available from the club shop so possibly just change them anyway.

When I rebuilt my engine I was surprised how worn the spring was and the ball had a definite circle worn into it.

Before my engine rebuild, my oil pressure would drop as low as 5psi at tick over, and rise to around 27-30 at around 40mph, and would be lower when hot. As I cleaned every part of the engine when I rebuilt it, I now use Comma 20W50 Classic oil and get 28psi cold regardless of rev's and 30-32 when hot wether revving or not. I think the new spring and ball helped with this, along with the regrind and new bearings, but the type of oil will have an effect too. I wouldn't have gone for this oil though if I had not been 100% confident everything was spotless.

A surprising amount of sludge builds up in all the corners of the engine over time with a standard single grade mineral oil in our old engines with only a gauze to collect anything as you can see from the picture below inside my timing case when I dismantled it. I had changed the oil not long before I did this so an oil change won't move the build up either.

Thats why its always important to clean the sump and the gauge strainer when we change the oil, and change it regularly.

Hope that helps,

Mike

32000987974_068768de69_k.jpgAustin 10 engine rebuild by Mike Love, on Flickr

Offline

Board footer

Powered by FluxBB