I am the owner of a 4/72 FJ40 with the original F155 engine. I purchased it in 4-2019 and right away I could tell it did not run well. After a long process to figure out what was ailing it, it turned out to be blown the head gasket.
Took the head to a shop I have used in the past and had the head rebuilt and flattened (it was warped). Cleaned the block head gasket surfaces, cylinders, piston tops and chased and cleaned all threads. Checked the block for flatness and found no issues. The cylinders looked OK so I did not have the block rebuilt or resurfaced.
I purchased an $.O.R. head overhaul kit but noticed the head gasket was not as good quality as the metal one I removed. Installed it anyway with no problems, torqued it in three steps to 90 ft./lbs. using A.R.B Ultra Torque on the head bolts. Adjusted the valves per the FSM. Now when I check the compression it’s very low (30 to 60 PSI) on all cylinders.
Any idea where I went wrong?? I am out of ideas. I was hoping to just get it running so I could drive it. My plan was to eventually replace the F engine with something else as there is so little parts support available.
Took the head to a shop I have used in the past and had the head rebuilt and flattened (it was warped). Cleaned the block head gasket surfaces, cylinders, piston tops and chased and cleaned all threads. Checked the block for flatness and found no issues. The cylinders looked OK so I did not have the block rebuilt or resurfaced.
I purchased an $.O.R. head overhaul kit but noticed the head gasket was not as good quality as the metal one I removed. Installed it anyway with no problems, torqued it in three steps to 90 ft./lbs. using A.R.B Ultra Torque on the head bolts. Adjusted the valves per the FSM. Now when I check the compression it’s very low (30 to 60 PSI) on all cylinders.
Any idea where I went wrong?? I am out of ideas. I was hoping to just get it running so I could drive it. My plan was to eventually replace the F engine with something else as there is so little parts support available.