4---3
4.3.4Adjusting Engine Speed
The engine speed operates at 1820 to 1840 rpm (no
load), 1710 rpm (with load).
Two methods to check engine speeds are:
1. With the engine stopped, place a mark (white
paint for example) on the crankshaft sheave. Start engine
and verify engine speed by using a Strobette---model 964
(Strobetachometer), Carrier Transicold Part No.
07---00206.
2. With the engine stopped, the second method of
checking engine speed is by using a frequency (hertz)
meter. Attach one lead to CB---1 terminal 1, electrical
schematics, and the other to chassis ground. Start engine
and 60.5 hertz will be 1820 rpm and 61.3 hertz will be 1840
rpm (no load).
1
2
3
1. Speed lever
2. Jam nut “B”
3. Capscrew “B”
Figure 4---2. Speed Adjustment
To Increase Speed:
Loosen jam nut “B.” Turn capscrew “B” clockwise
until correct speed is achieved, then tighten jam nut “B”
and check engine speed.
To Decrease Speed:
Loosen jam nut “B.” Turn capscrew “B” counter---
clockwise until correct speed is achieved, then tighten
jam nut “B” and check engine speed.
4.3.5Servicing the Mechanical Fuel Pump
a. To Check or Replace Filter (See Figure 4---3)
1
2
3
1
4
1. Nut
2. Banjo
3. Filter
4. Copper Rings
Figure 4---3. Mechanical Fuel Pump
Due to foreign particles in the fuel and wax as a result
of using the wrong grade of fuel or untreated fuel in cold
weather. The fuel filter may become plugged or re-
stricted, and the engine will loose capacity. The filter
must be cleaned on a regular schedule such as unit pre---
trip or when the oil and fuel filters are changed (refer to
paragraph 4.1).
1. Turn nut counter---clockwise to loosen and re-
move (item 1).
2. Remove banjo fitting (item 2) and let it hang
loose, making sure to keep copper rings (item 4) for re-
placement.
3. Turn filter (item 3) counter---clockwise and re-
move. Check and clean.
4. To install reverse steps 1 through 3.
4.3.6Engine Air Cleaner
a. Inspection
The air cleaner should be inspected constantly for
leaks. A damaged air cleaner or hose can seriously affect
the performance and life of the engine. The following
simple service steps are easily made while the engine is
being serviced in the field.
The simple service steps are as follows:
1. Watch all connections for mechanical tightness.
Be sure cleaner outlet pipe is not fractured.
2. If cleaner has been dented or damaged, check all
connections immediately.
3. In case of leakage and if adjustment does not
correct the trouble, replace necessary parts or gaskets.
Swelled or distorted gaskets must always be renewed.
b. Service Procedure
1. Empty dust cover as required. Check to see that
the Vacuator is not inverted, damaged or plugged.
2. Stop the engine, remove and clean the dust cap.
Remove the dirty element from the air cleaner. Install
new filter and tighten wing nut securely.
3. Install dust cover, making sure it seals 360
_
around
the air cleaner body. Check all connections between the
air cleaner and the engine to be certain that they are tight
and leak---free.
1
2
3
4
5
1. Body assembly
4. Dust cap
2. Primary element
5. Vacuator
3. Clamp
Figure 4---4. Air Cleaner
4.3.7Engine Crankcase Breather
Both engines use a closed type breather with the
breather line attached to the cylinder head cover. (See
Figure 4---5)
The breather assembly should be cleaned once a year
or at every 3000 hours maintenance interval (whichever
comes first).
