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You must replace your 2F head for your Land Cruiser vehicle if you see the symptom like this : Noticed the engine was running roughly. Exhaust smelled unusual – a rich smell from unburned gas. After checking the spark plugs, one was noticed it was saturated with oil cylinder #1. The Diagnosis : No spark present in the cylinder. No spark present in the cylinder at the correct time. Low compression due to worn piston rings. Exhaust valve remaining open. A pressure gage was purchased (about $30) to check compression on all 6 cylinders. The following procedure was used: Remove all spark plugs. Remove coil to distributor wire. Removed electric fuel pump fuse (vehicle does not have mechanical fuel pump). Put accelerator in full throttle. Connect gage to spark plug opening (screws in). Crank engine for 3 seconds and monitor max pressure reading. Do this on all 6 cylinders. Replacement Day : The valve cover was removed, followed by the rocker assembly, then the head bolts. The last 2 bolts were very difficult to remove (the last 2 on the drivers side, near the firewall). Upon removal, there was oxidation present. To prepare the block for the new head, the old gasket material was completely removed by scraping with a chisel. It was important that all material be removed or the head would not seat well. Carb cleaner was used to aid the gasket removal process and to insure all grease and oil was eliminated. The manifold had originally had a flapper that would be open when the engine was cold to allow the carburetor to warm up (located inside the exhaust manifold).

Tags : toyota land cruiser, electric fuel pump, worn piston rings, gasket material, pressure gage, head bolts, rocker assembly, rich smell, correct time, 6 cylinders, max pressure, exhaust manifold, valve cover, land cruiser, fuel pump
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