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