10
FIG. 1
General Information
Compression Release Valves 100-107-113-120-127-130-140 CI
All Ultima
®
100 CI and larger engines are supplied with manually
operated push button compression release valves. These valves aid in
starting your engine and can greatly increase your starter and battery
life. To operate these simply depress the Top Cap as shown in Figure 1
and they will pop back up automatically once the engine is cranking.
These are designed to help the starter to begin spinning the engine by
providing a small bypass hole to relieve compression as the engine is
rotated. When the cylinder pressure overcomes the CR valves spring
tension it automatically shuts. After prolonged use valves can become
sticky and closing can be slow. A slight blip of the throttle while the
engine is running should shut the valves immediately.
PCV System and Rocker Boxes:
All Ultima
®
engines are designed to use 1993 & later style PCV systems (Rocker Boxes). Proper installation and free operation of the Cylinder
Head Vent lines are very important to your engine’s oiling system and overall performance. We recommend using only this late style breather
system and not opening the lower case breathers, which come plugged from the factory.
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