Club Car CARRYALL 252 2007, Руководство по техническому обслуживанию и ремонту

Страница: 293 / 536

S27 FE 350 ENGINE Cylinder Head
16
CYLINDER HEAD
See General Warning on page 1-1.
GENERAL INFORMATION
Test cylinder compression using a standard compression tester. Low compression would normally indicate a problem
in the cylinder assembly such as defective rings, gaskets, etc. Compression should be:
• Key-Start engines: Key-start engines are equipped with an automatic compression release valve (ACR). This
valve releases compression pressure at normal cranking RPM, resulting in lower compression. At a normal
cranking speed of 550-600 RPM, the compression should typically be 71 psi. This value could vary slightly
depending on wear of components affecting compression.
• Pedal-Start engines: Pedal-start engines are not equipped with an automatic compression release valve (ACR). At
a normal cranking speed of 550-600 RPM, the compression should typically be 156 psi. This value could vary
slightly depending on wear of components affecting compression.
See the Engines and Drivetrain Components, Repair and Rebuild Manual for inspection and repair.
BREATHER VALVE (REED VALVE)
General Information
The function of the breather is to create a vacuum in the crankcase which prevents oil from being forced out of the
engine through the piston rings, oil seals or gaskets. The breather has a reed valve which limits the direction of air flow
caused by the piston moving up and down. Air can flow out of the crankcase, but the one-way reed valve blocks return
flow and therefore maintains a vacuum in the crankcase.
Oil laden air in the crankcase passes through the reed valve and expands into the rocker chamber. In the rocker
chamber most oil separates from the air and drains back to the crankcase. The air passes through a tube and vents to
the intake manifold.
See Engines and Transaxles Manual for inspection and repair.
VALVE CLEARANCE CHECK AND ADJUSTMENT
1. Check and adjust clearance when the engine is cold.
2. Turn the crankshaft until the piston is at the top of the compression stroke.
3. Using a feeler gauge (1), measure the clearance (2) between the adjuster screw (3) and the top of the valve stem
(4)
(Figure 16-2, Page 16-3 and Figure 16-3, Page 16-3)
4. If necessary, loosen the lock nut (3) and turn the adjuster (6) up or down to adjust the clearance to 0.005 inch
(0.127 mm) for both intake and exhaust
(Figure 16-2, Page 16-3)
5. While keeping the adjuster from turning with the screw holder (5) (CCI P/N 1016413), tighten the lock nut (3) to
90 in-lb (10 N·m).
6. Recheck the clearance on both valves.
Figure 16-2 Measure Valve Clearance Figure 16-3 Valve Clearance
2007-2009 Turf 252, Carryall 252 and XRT 900 Maintenance and Service Manual Page 16-3