12-06-2021, 10:54 PM
(This post was last modified: 13-06-2021, 07:43 AM by Colin Morgan.)
Yes, that is strange behaviour. Trying to think a bit about what Ruairidh has suggested above - both possibilities. Presumably a broken spring would mean that the pressure seen might not go above 6psi on cold start-up but then it would be expected to come down below this once the oil is warmer, especially on tick-over? And a stuck oil vane might still be expected to give a variation with engine speed? As you know the pressure is generated as 'back pressure' from the resistance created by the oil being pushed through the jets - seems unlikely that this would be constant with changing speed/temperatures if oil is circulating and the gauge is showing the true back pressure? Given you have tried two gauges and they both read the same, this is a puzzle. Sorry - I don't know - hope you soon have it sorted out.