Update on the Mag 18 saga. Yesterday after I installed the new seal and reinstalled the closure plate I decided to do a leak down test on the Mag 18 before I reinstalled it into the 782. The engine has 120 psi compression but the right cylinder has a intermittent miss and I decided to find out the cause. Left cyl has 10% leak down, right cyl had just over 20% Both leak out the exhaust. So I pulled the valve covers and noticed that the rotators are on the intake valves instead of the exhaust and the exhaust valves only have .006 of clearance. I an wondering if who ever rebuilt it switched the jugs side to side when he reassembled it. So I picked up two new head gaskets and I will remove both heads, remove the valves to see if they are not mixed, hVe the valves faces and touch up the seats. I do not want to have to remove this engine again. I will let you know what I find when I get it tore down. So much for a quick and easy engine swap.
Later
Tom
|