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wrench to ensure that the intake and exhaust valve clearances are within the specified range of standard values. (valve clearance
adjustment nut torque: 9±1N.m intake valve clearance:
0.10mm - 0.14mm
exhaust valve clearance:
0.18mm - 0.22mm)
Cylinder head installation
1. Remove the oil stains, water stains and dust on the joint surface of the cylinder and the cylinder head. After checking that
there are no foreign objects on the surface of the cylinder and pis
ton, install 2 φ10 positioning pins and cylinder head gaskets
(note: cylinder head gaskets cannot be repeated.
Use. After the cylinder head has been disassembled, the gasket of the
cylinder body box needs to be replaced, and the joint surface needs to be coated with flat sealant. For the installation of the
cylinder piston, refer to the ZT1P52MI engine maintenance manual - cylinder, piston).
2. As shown in the figure, after confirming that there is no missing or wrong installation, install the cylinder head into the
corresponding position of the engine. After evenly diagonally pre-tightening the cylinder head nut and the two locking bolts on
t
he side, use the fixed torque wrench to tighten respectively (nut φ8.3×φ17×2 iron gasket should not be missed, m8×1.25
hexagonal flange nut fixed torque 25 ± 3 N.m, m6×105 hexagonal flange bolts with a fixed torque of 12 ± 1.5 N.m
)
.
3. As shown in the figure, check the marked line of the t point of the flywheel, and the marked line of the t point is aligned with
the position of the arrow. At the same time, the top dead center marking line on the timing driven sprocket should also be
aligned with the scale line of the camshaft bearing pressure plate, install the decompression lever and the timing sprocket, and
use the flywheel limit tooling to fit the crankshaft on the upper limit of the magneto rotor. Tighten and torque the camshaft bolts
with a wind gun + sleeve head 14#, torque: 30±2N.m, and install it into the tensioner.
Remarks:
1. After confirming that the timing chain has not fallen off from the timing drive gear, tighten the timing sprocket at a constant
torque, and after installing the tensioner, turn the crankshaft to recheck the timing for the second time.
2. After the camshaft bolts are tightened to a fixed torque, move the decompression mechanism of the driven sprocket. The
decompression mechanism should rebound quickly, and if it is not stuck, it is qualified.
align
8# wrench
Feeler
