Jeep CJ 1945-1970 Repair Information

Intake Manifold

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REMOVAL & INSTALLATION



4-134 Engine
L-HEAD MODEL

See Figures 1 through 9



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Fig. Fig. 1: If necessary, spray the ventilator tube fitting with a penetrating lubrication ...



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Fig. Fig. 2: ... then detach the ventilator tube from the manifold



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Fig. Fig. 3: Detach all vacuum connections from the intake/exhaust manifold



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Fig. Fig. 4: Remove the manifold-to-exhaust pipe mounting nuts ...



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Fig. Fig. 5: ... then remove the manifold-to-engine block mounting bolts



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Fig. Fig. 6: Pull the manifold off of the engine block ...



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Fig. Fig. 7: As can be seen, the intake and exhaust manifolds are fastened together



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Fig. Fig. 8: To separate the manifolds, remove the mounting bolts



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Fig. Fig. 9: Once the manifold is removed, access to the side cover can be gained

The intake and exhaust manifolds are bolted together and are easiest removed as an assembly.

  1. On models so equipped, remove the crankcase ventilator tube which runs from the ventilator valve mounted in the intake manifold to an elbow mounted on the valve cover plate.
  2.  
  3. Remove the seven nuts from the manifold-to-block studs.
  4.  
  5. Pull the manifolds off the studs. Discard the gasket.
  6.  

To install:
  1. If the studs were removed for replacement, coat the new studs with a sealer such as Permatex No. 2, prior to installation.
  2.  
  3. Place a new gasket in position on the studs and carefully slide the manifolds on. Tighten to 29-35 ft. lbs. (39-48 Nm). in a circular pattern from the ends toward the center.
  4.  

F-HEAD MODEL

On the F4-134 engine the intake manifold is cast as an integral part of the head.

6-225 Engine

See Figure 10



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Fig. Fig. 10: Intake manifold tightening sequence for the 6-225 engine

  1. Drain the cooling system.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the crankcase vent hose, distributor vacuum hose, and the fuel line from the carburetor.
  2.  
  3. Disconnect the two distributor leads from the coil.
  4.  
  5. Disconnect the wire from the temperature sending unit.
  6.  
  7. Remove the ten cap bolts that hold the intake manifold to the cylinder head. They must be replaced in their original location.
  8.  
  9. Remove the intake manifold assembly and gasket from the engine.
  10.  
  11. Reverse the removal procedure for installation. Tighten the bolts to the correct torque, and in the proper sequence.
  12.  

6-226 Engine

The intake and exhaust manifolds are removed as a unit, then separated.

  1. Remove the engine cover and housing.
  2.  
  3. Remove the air cleaner and carburetor.
  4.  
  5. Disconnect the exhaust pipe at the manifold.
  6.  
  7. Unbolt and remove the manifolds.
  8.  
  9. Installation is the reverse of removal. Retainers are used under the retaining nuts on all studs except the top ends and lower center. Plain washers are used under these nuts. It is possible, if you're not careful, to install the manifold assembly so that it interferes with the fit of the valve chamber cover at the upper rear corner of the cover. Leakage would result in this case. Tighten the nuts, from the center towards the ends, to 30-35 ft. lbs. (41-48 Nm).
  10.  

6-230 Engine
  1. Disconnect and tag any hoses, wires or cables attached to the manifold or carburetor.
  2.  
  3. Remove the air cleaner.
  4.  
  5. Remove the carburetor.
  6.  
  7. Remove the nut and lock washer that attaches the manifold and dipstick tube to the lower center stud on the head.
  8.  
  9. Remove the dipstick and tube.
  10.  
  11. Support the manifold and remove the four remaining nuts and lock washers that attach it to the head and manifold.
  12.  
  13. Discard the gasket and thoroughly clean the mating surfaces of the head and manifold.
  14.  
  15. Installation is the reverse of removal. Always use a new gasket. Note that the gasket overlaps the intake port openings slightly. This is a calculated overlap designed to assist in air/fuel distribution. Do not attempt to cut the gasket to make it larger. Tighten the manifold nuts to 15-20 ft. lbs. (20-27 Nm).
  16.  

 
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