My 4.2 has been fully rebuilt, new liners, pistons, rings, bearings, crack tested, measured, regrinded etc - professionally stripped and reassembled by reputable machine shop.
Later oil pump fitted from XJ6
Conrods from an XJ6 (invoice says they resized conrod tunnels)
No external oil leaks.
Low oil pressure on start up - around 15PSI?
My mechanic has checked the oil pressure release value and that didn’t help.
He is going to remove the sump to have a look for anything obvious.
He’s very competent and knows what he is doing so i guess i’m asking for any tips for my own benefit - any ideas?