1945 JEEP ROUTINE MAINTENANCE
ROUTINE MAINTENANCE
See the Maintenance Intervals Chart in this section for the recommended maintenance intervals for the components covered here.
Air Cleaner
OIL BATH TYPE
To service the oil bath type air cleaner on the L4–134, F4–134, 6–226 or 6–230, first unscrew the oil cup clamp and remove the oil cup from the cleaner body. Remove the oil from the cup and scrape out all the dirt inside, on the bottom. Wash the cup with a safe solvent. Refill the oil cup and replace it on the air cleaner body. Use the same viscosity of oil as you use in the engine crankcase.
To service the air cleaner body (less the oil cup), loosen the hose clamp and remove the hose form the cleaner. Detach the breather hose from the fitting on the cleaner. Remove the two wing nuts and lift the cleaner from the vehicle. Agitate the cleaner body thoroughly in a cleaning solution to clean the filtering element and then dry the element with compressed air. Reinstall the air cleaner body and replace the oil cup. The air cleaner should be serviced every 2,000 miles.
To service the oil bath type air cleaner on V6 engines, first remove the air cleaner from the engine by unscrewing the wing nut on top of the air cleaner. Remove the oil cup from the body of the air cleaner and remove all of the oil from the oil cup. Remove all of the dirt from the inside of the coil cup with a safe solvent. Wash the filter element in solvent, air dry it, and then fill the oil cup to the indicated level with clean oil. Assemble the air cleaner element to the oil cup, making sure that the gasket is in place between the two pieces. Mount the air cleaner assembly in the carburetor, making sure that the gasket between the air cleaner and the carburetor is in place and making a good seal. Secure the air cleaner to the carburetor with the wing nut.
PAPER ELEMENT TYPE
Remove the wing nut or hex nuts on top of the cover. On the 6–225, detach the rubber hose from the engine rocker arm (valve) cover and set the cover aside, being careful not to damage the large diameter hose or hoses to the air cleaner inlet.
If the filter element has a foam wrapper, remove the wrapper and wash it in detergent or a safe solvent. Squeeze and blot dry. Wet the wrapper in engine oil and squeeze it tightly in an absorbent towel or rag to remove the excess.
Clean the dirt from the paper element by rapping it gently against a flat surface. Replace the element as necessary.
Clean the housing and the cover. Replace the oiled wrapper, if any, on the element and reinstall the element in the housing, placing it 180 degrees from its original position.
NOTE: The oiled foam wrapper element is a factory option for some years. It should be available through Jeep parts. There are also aftermarket variations on this, both dry and oiled.
Fuel Filter
REPLACEMENT
Early 4–134 and All 6–226
Fig. 1: The fuel pump/filter assembly is mounted on the lower left-hand side of the engine (arrow)
Fig. 2: Loosen the retaining screw . . .
Fig. 3: . . . push the retaining screw and wire off to one side . . .
Fig. 4: . . . then lift the cover off of the pump — the screen/filter is under the cover
Most of these engines have a fuel pump with a bowl containing a replaceable filter element. Some have only a mesh strainer in the fuel pump.
Late 4–134, 6–225 and 6–230
Fig. 5: When installing a new fuel filter, make certain that the fuel flow indicator marks on the filter point in the correct direction
All these engines have a throwaway cartridge filter in the line between the fuel pump and the carburetor. To replace it:
Remove the air cleaner as necessary.
Put an absorbent rag under the filter to catch spillage.
Remove the hose clamps.
Remove the filter and short attaching hoses.
Remove the hoses if they are to be reused.
Assemble the new filter and hoses.
NOTE: The original equipment wire hose clamps should be replaced with screw type band clamps for the best results.
Install the filter, tighten the clamps, start the engine, and check for leaks. Discard the rag and old filter safely.
PCV Valve
The PCV valve, which is the heart of the positive crankcase ventilation system, should be free of dirt and residue and in working order. As long as the valve is kept clean and is not showing signs of becoming damaged or gummed up, it should work properly. When the valve cannot be cleaned sufficiently or becomes sticky and will not operate freely, it should be replaced.
The PCV filter, which is located at the air filter housing on some 6-cylinder models, should be checked along with the PCV valve. Just blow out the screen with compressed air in the reverse direction of the normal air flow. Check to see that the screen forms a good seal around the edges of the air cleaner housing so no dirt can pass. If the screen is torn or clogged, or if it is seated improperly and cannot be repaired, replace it.
The PCV valve is in the right rocker arm (valve) cover on the V6 engines, in the intake manifold on the 4-cylinder engines, and in the rocker arm cover on the inline 6-cylinder engines.
Heat Riser
The heat riser is a thermostatically operated valve in the exhaust manifold. It closes when the engine is cold, to direct hot exhaust gases to the intake manifold, in order to preheat the incoming fuel/air mixture. If it sticks closed, the result will be a rough idle after the engine warms up. If it sticks open, there will be frequent stalling during warm up, especially in cold and damp weather.
On the V6, the valve is between the exhaust manifold and the exhaust pipe. On inline 6-cylinder engines, it is an integral part of the exhaust manifold. The heat riser counterweight should move freely. If it sticks, apply Jeep Heat Valve Lubricant or something similar (engine cool) to the ends of the shaft. Sometimes rapping the end of the shaft sharply with a hammer (engine hot) will break it loose. If this fails, parts must be removed for repair or replacement.
Evaporative Canister
None of the 1945–70 Jeep models came equipped from the factory with an evaporative canister.
