Sq 4 oil pressure

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Brian.Challinor
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Sq 4 oil pressure

Postby Brian.Challinor » Sun Jan 26, 2014 4:28 pm

I've just started my 52 square 4 after a complete rebuild. My worry is I am not getting any reading on the oil pressure gauge. I have only run it for less than 30 seconds and the oil is retuning to the oil tank , but I do not want to run it any longer until I get pressure at the gauge. I have the original pump fitted with new springs and balls. What should I be doing next?

Brian.Challinor
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Postby Brian.Challinor » Sun Jan 26, 2014 5:50 pm

Panic over , I just stripped down the timing case side, and found that I'd put the drilled stud in the wrong way round.(The stud that the banjo goes on to.) Good job I didn't run it for long. Doh . Schoolboy error.

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Steven.Carter
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Postby Steven.Carter » Sun Jan 26, 2014 6:07 pm

Well done, I call it cold sweat time. Its horrible.

Steve

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simon.holyfield
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Postby simon.holyfield » Sun Jan 26, 2014 7:13 pm

You beat me to it Brian. Well done!
Where did you get that rocker feed stud from? I can't find one anywhere.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
http://ariel-square-four.blogspot.com

Brian.Challinor
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Re: Sq 4 oil pressure

Postby Brian.Challinor » Sun Jan 26, 2014 8:49 pm

Simon
It was in one of the boxes that the bike came in, I'm still not happy with the oil pressure, when I started it after turning the stud round I was getting 50psi , dead chuffed, then I left it for half a hour and started it again 25psi dropping down to 0 . I've left it alone for now but I'm wondering if its air locked or I haven't put enough oil in.

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brenton.roy
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Postby brenton.roy » Sun Jan 26, 2014 10:26 pm

Brian, you could check the spring tension on the relief valve at the end of the crank. I think it gets weak.
Brenton
'51,'56 Squares, '48 VH, '27 Model C, R67/2, Mk IV Le Mans, '06 Super Duke and Ariel projects.

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Bob.Murphy
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Re: Sq 4 oil pressure

Postby Bob.Murphy » Sun Jan 26, 2014 10:30 pm

Way back when I rebuilt a four-pipe Square Four, I used to get 52 psi when cold which dropped to around 5 psi on the road when hot. The problem turned out to be the pressure release ball valve in the front crankshaft.

A new spring and properly seated ball cured it - 52 psi when hot at road speed.

I guess yours is a two-pipe with a plunger pump (mine had a gear pump) ?? So you may not get that pressure when hot (just guessing).

I used Castrol Grand Prix (straight 50), what oil are you using ??

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Bob.Murphy
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Re: Sq 4 oil pressure

Postby Bob.Murphy » Sun Jan 26, 2014 10:31 pm

DOH :!: :!:

Beaten to it :roll: .

Bob.
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Brian.Challinor
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Re: Sq 4 oil pressure

Postby Brian.Challinor » Mon Jan 27, 2014 9:45 am

I have a new spring and ball in the relief valve, will check the seating of it. I 'm using Morris straight 50 oil.

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simon.holyfield
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Postby simon.holyfield » Mon Jan 27, 2014 10:00 am

I was planning to turn mine over with a power drill on the shock absorber, until I got oil pressure.
cheers

Simes

'51 Square Four,
'58 Huntmaster,
'42 W/NG,
'30 Model A
http://ariel-square-four.blogspot.com


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