|
|
Content .. 1507 1508 1509 1510 ..
MANIFOLD-INTAKE DIAGNOSIS AND TESTING INTAKE MANIFOLD LEAKS An intake manifold air leak is characterized by lower than normal manifold vacuum. Also, one or more cylinders may WARNING: Use extreme caution when the engine is operating. Do not stand in a direct line with the fan. Do 1. Start the engine. 2. Spray a small stream of water (Spray Bottle) at the suspected leak area. 3. If engine RPM’S change, the area of the suspected leak has been found. 4. Repair as required. STANDARD PROCEDURE - INTAKE MANIFOLD VACUUM PORT REPAIR The composite intake manifold vacuum ports can be repaired. Although, if the manifold plenum chamber is dam- To repair a broken or damaged vacuum nipple (port) on the composite intake manifold, perform the following pro- PARTS REQUIRED TOOLS REQUIRED Brass Nipple – 3/8 9 O.D. x 1/4 9 pipe thread (Speed Control Port) Pipe Tap – 1/4 9 - 18 NPT Brass Nipple – 1/2 9 O.D. x 1/4 9 pipe thread (Brake Booster Port) Drill Bit – 7/16 9 File/Sand Paper NOTE: While performing this procedure, avoid getting the manifold material residue into the plenum cham- 1. File or sand the remaining port back until a flat sur- face is obtained (plane normal to nipple (port) 2. Drill out the nipple port (2) base using a 7/16” drill bit. 3. Using a 1/4”–18 NPT pipe tap (1), cut internal threads. Use caution to start tap in a axis same as 4. Apply Mopar T Thread Sealant to threads of repair nipple(s). 5. Install repair nipple(s). Do not over torque repair nipple(s). 9 - 2060 ENGINE - 2.7L DOHC - SERVICE INFORMATION LX |