larso1
Gold Member
Yes, John Bud may be on to something there. On my Isuzu 2-cyl. diesel, holes in the rear shaft support tower where the oil is supplied from an external steel tube from the lower oil galley near the filter, must line up with the holes in the shaft, otherwise no oil to the rockers. The shaft (at least mine) is hollow with plugs at each end. From there, additional holes in the rocker shaft are also located at each rocker plain bearing. Oil must flow out from that bearing clearance onto the top of the head and back to the sump, in my case, down the push rod tunnels in the head and block. (This may be info you already know, but just in case)
My problem was totally opposite. Too much oiling at the rockers and it couldn't flow fast enough down the pushrod tunnels, so it backed up and eventually (5-min.) flowed out the breather on top of the valve cover. The fix was just a matter of replacing the rocker shaft and rockers to get back the proper clearances.
Bill
My problem was totally opposite. Too much oiling at the rockers and it couldn't flow fast enough down the pushrod tunnels, so it backed up and eventually (5-min.) flowed out the breather on top of the valve cover. The fix was just a matter of replacing the rocker shaft and rockers to get back the proper clearances.
Bill