Thermo King T-1000R, Maintenance Manual

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Engine Maintenance 9-29
ADJUST ENGINE VALVE CLEARANCE
The valve clearance should be checked after every 2000 operating hours, maximum. It is important that valves be adjusted to
the correct specifications for satisfactory engine operation. Insufficient valve clearance will result in compression loss and
misfiring of cylinders resulting in burned valves and seats. Excessive valve clearance will result in noisy valve operation and
abnormal wear of the valves and rocker arms. The intake and exhaust valves are adjusted with the valve in the closed position.
The cylinders on these engines are numbered from the flywheel end to the water pump end. The number 1 cylinder is next to
the flywheel. The number 2 cylinder is in the middle and the number 3 cylinder is next to the water pump. The timing marks
on the flywheel are also numbered this way. (For the TK 270 Engine - there is only 2 cylinders - so the number 2 cylinder is
next to the water pump.
The timing marks on the flywheel of the three cylinder engines are stamped 120 degrees apart. The top dead center marks
have the cylinder number stamped next to them. The injection timing marks have no identification marks (see Figure ).
The timing marks on the flywheel of the two cylinder engines are stamped 180 degrees apart. The top dead center marks have
the cylinder number stamped next to them. The injection timing marks have no identification marks
The index timing mark is stamped on the side of the starter mounting plate that faces the flywheel. This index timing mark is
on the intake side of the engine.
On the three cylinder engines the order for the flywheel timing marks is 1, 2, 3, but the firing order is 1, 3, 2. The reason for
this is that the engine fires every 240 degrees of crankshaft rotation. Therefore, when adjusting the valves, check the number
1 cylinder first. Then rotate the engine past the number 2 cylinder timing marks to the number 3 cylinder timing marks and
check the number 3 cylinder. Finally, rotate the engine past the number 1 cylinder timing marks to the number 2 cylinder
timing marks and check the number 2 cylinder.
Valve Adjustment and Firing Order
1. Remove the cylinder head cover.
2. Place the engine at top dead center of the compression stroke for the number 1 cylinder.
a. Rotate the engine in the normal direction of rotation (counterclockwise viewed from the flywheel end) until the top
dead center timing mark for the number 1 cylinder on the flywheel lines up with the index timing mark on the starter
mounting plate.
CAUTION: Loosen all of the injection lines at the injection nozzles to prevent the possibility of the engine firing
while it is being rotated.