GENERAL INFORMATION CU800 Service Manual
13
1.8.1 Screwdrivers
Screwdrivers of various lengths and types are mandatory for the simplest tool kit. The two basic
types are the slotted tip (flat blade) and the Phillips tip. These are available in sets that often include
an assortment of tip size and shaft lengths.
As with all tools, use a screwdriver designed for the job. Make sure the size of the fastener. Use
them only for driving screws. Never use a screwdriver for prying or chiseling metal. Repair or replace
worn or damaged screwdrivers. A worn tip may damage the fastener, making it difficult to remove.
Phillips-head screws are often damaged by incorrectly fitting screwdrivers. Quality Phillips
screwdrivers are manufactured with their crosshead tip machined to Phillips Screw Company
specifications. Poor quality or damaged Phillips screwdrivers can back out (cam out) and round over
the screw head. In addition. Weak or soft screw materials can make removal difficult.
The best type of screwdriver to use on Phillips screw is
the ACR Phillips II screwdriver, patented by the horizontal
anti-cam out ribs found on the driving faces or flutes of the
screwdriver’s tip (figure 4). ACR Phillips II screwdrivers
were designed as part of a manufacturing drive system to
be used with ACR Phillips II screws, but they work of tool
companies offer ACR Phillips II screwdrivers in different Tip
size and interchangeable bits to fit screwdriver bit holders.
NOTE
Another way to prevent cam out and to increase the grip of a Phillips screwdriver is to apply
valve grinding compound or permute screw ＆ socket gripper onto the screwdriver tip. After
loosening/tightening the screw, clean the screw recess to prevent engine oil contamination.
1.8.2 Wrenches
Open-end, box-end and combination wrenches
(figure 5) are available in a variety of types and
sizes.
The number stamped on the wrench refers to
the distance of the fastener head.
The box-end wrench is an excellent tool
because it grips the fastener on all sides. This
reduces the chance of the tool slipping. The box-
end wrench is designed with either a 6 or 12-point
opening. For stubborn or damaged fasteners, the 6-
point provides superior holding because it contacts
the fastener across a wider area at all six edges.
For general use, the 12-point works well. It allows
the wrench to be removed and reinstalled without
moving the handle over such a wide are.
An open-end wrench is fast and works best in areas with limited overhead access. It contacts the
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