I have a 1974 FJ40 with a 1978 F2 engine. I have had the vehicle for about a year and don't know anything about it's history. The engine recently started making a knocking (loud tapping?) noise from what seems like the top front of the engine. The noise is not present at idle speed. Have done the following diagnostics:
-Oil pressure is 60psi at start-up and drops to about 50-55 after 10 mins of warm-up. I installed a mechanical gauge because the stock sensor/gauge is not working.
-Pulled ignition wires one-by-one with no discernible difference in the knocking.
-Knocking seems to be in sync with engine RPM
-Removed valve cover and did not see any sticking or damaged push rods.
Any suggestions on what else to do to diagnose the problem? Thanks in advance for input.
Here is a video of the noise:
-Oil pressure is 60psi at start-up and drops to about 50-55 after 10 mins of warm-up. I installed a mechanical gauge because the stock sensor/gauge is not working.
-Pulled ignition wires one-by-one with no discernible difference in the knocking.
-Knocking seems to be in sync with engine RPM
-Removed valve cover and did not see any sticking or damaged push rods.
Any suggestions on what else to do to diagnose the problem? Thanks in advance for input.
Here is a video of the noise: