Jeep UNIVERSAL CJ-2A - Page 114

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
G
EXHAUST SYSTEM
G-1. Models CJ-2A, CJ-3A, DJ-3A
On L-head engines, the exhaust and intake mani-
folds form one unit which is mounted on the left
side of the engine. A valve is mounted in the exhaust
section of this unit which, when open, directs the
exhaust gases around the intake riser to assist in
vaporizing the fuel when the engine is cold, there-
by aiding in warming up the engine and reducing
engine oil dilution. It also minimizes the use of
the carburetor choke control.
When the engine is cold, the counterweight lever
closes
the valve and directs the hot exhaust gases
against the intake riser to assist in vaporizing the
fuel. As the engine warms up, the thermostatic
spring expands and opens the valve sending the
exhaust gas directly into the exhaust pipe. Note
that the thermostatic spring is assembled to rest
on top of stop No. 14 in Fig. 135, on Models CJ-2A,
CJ-3A, and DJ-3A.
The manifold heat control valve must operate
freely without binding or excessive play. Each
time the valve bushings are lubricated, proper
operation of the valve should be checked.
When assembling the manifolds to the cylinder
block, new gaskets should be installed, and the
nuts drawn up evenly until they are tight, to avoid
leakage. Torque wrench reading, 29-35 ft. lbs. [4,01-
4,84 kg-m.].
G-2. Models CJ-38, CJ-5, CJ-6
On F-head engines, the exhaust and intake mani-
folds are separate units. The intake manifold is cast
as an integral part of the cylinder head and is com-
pletely water jacketed. This construction transfers
FIG. 135-MANIFOLDS AND HEAT
CONTROL VALVE-DJ-3A
1-Exhaust Manifold
2-Gasket
3-lntake Manifold
4-Lever
5-Key
6-Nut
7-Screw
8-Washer
9-8pring
10-Shaft
11-Bolt and Lockwasher
12-8tud
13-Plug
14-8top
heat from the coolin-g system to the intake riser and
assists in vaporizing the fuel when the engine is
cold.
With this construction, there is no heat control
valve on the F -head engine and the only function
of the exhaust manifold is to gather and direct the
exhaust gases into the exhaust pipe.
When assembling the manifold, Fig. 136, to the
cylinder block new gaskets should be installed and
FIG. 136-EXHAUST MANIFOLD
CJ-3B, CJ-5, CJ-6
1-8tud Nut
2-End Gasket
3-8tud
4_:_Manifold
5-Center Gasket
6-8tud
7-Gasket
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