Cylinder Head removal for Mercedes 3.2 & 4.3 Engine?

Cylinder Head
REMOVAL & INSTALLATION

Procedure for Mercedes Benz Truck model vehicles.

1. Before servicing the vehicle, refer to the Precautions section.
2. Remove or disconnect the following:
   
   
   Negative battery cable
3. Drain and recycle the engine coolant.
   
   
   Engine cooling fan and clutch

   Fan shroud

NOTE

The fan clutch is equipped with right-hand thread.

1. Place a guard plate behind the radiator/condenser to protect it from damage during removal and installation.
   
   
   Engine cover

   Air cleaner housing, resonance pipe and body
2. Properly relieve the fuel system pressure.
   
   
   Fuel line

   Ignition coils

   Cylinder head covers

NOTE

The intake manifold system must not be disassembled.

Intake manifold

Vacuum switchover valve

Camshaft Position (CMP) sensor

1. Lock the automatic belt tensioner by rotating the tensioner counterclockwise until a 5mm drift or pin fits through the tensioner.
   
   
   Serpentine belt

   Heater hose at left cylinder head

   Driver side fender liner

   Exhaust support bracket

   Power steering pump and position it aside leaving the hoses attached

   Exhaust system from the exhaust manifolds
2. Rotate the engine clockwise to position the crankshaft 40 degrees after top dead center.

WARNING

The engine must not be rotated backward.

1. Lock the camshafts using the Camshaft Locking tools 112 589 00 32 00 and 112 589 01 32 00.
2. Remove or disconnect the following:
   
   
   Generator, then the timing chain tensioner

   Oil filter housing and heat exchanger

   Camshaft gears and attach them to the chain with a cable tie

   Camshaft bearing bridges

   Timing case-to-cylinder head bolts
3. Loosen and remove the cylinder head bolts in stages following the illustrated sequence.
   
   
   Cylinder head off the engine block

   All gasket material from the sealing surfaces of the cylinder head and engine block. Be careful not to gouge or scratch the surface of the aluminum head. Be sure the cylinder head locating dowels are positioned in the engine block. Clean and dry the head bolt holes using compressed air.
4. Measure the length of the cylinder head bolt shafts, new bolt length is 5.57 inches (141.5mm) and the maximum permissible length is 5.69 inches (144.5mm). Replace bolts that measure greater than the maximum permissible length.

Fig. Exploded view of the cylinder head accessory components-3.2 and 3.7L engines shown; 4.3L and 5.0L engines similar

Fig. Exploded view of the cylinder head removal-3.2 and 3.7L engines shown; 4.3L and 5.0L engines similar

Fig. Cylinder head bolt removal sequence-3.2 and 3.7L engines

Fig. Cylinder head bolt removal sequence-4.3L and 5.0L engines

To install:

 

Fig. Cylinder head bolt tightening sequence-3.2 and 3.7L engines

 

Fig. Cylinder head bolt tightening sequence-4.3L and 5.0L engines

1. Clean the head bolt threads, then apply clean engine oil to the thread and head contact surfaces.
2. Install the cylinder head to the engine block and tighten the head bolts according to sequence as follows:
   1. Step 1. 96 inch lbs. (10 Nm).
   2. Step 2. 22 ft. lbs. (30 Nm).
   3. Step 3. 90 degrees.
   4. Step 4. additional 90 degrees.
3. Install or connect the following:
   
   
   Timing case-to-cylinder head bolts and tighten to 15 ft. lbs. (20 Nm)

   Camshaft bearing bridges

   Camshaft gear and tighten the mounting bolt to 37 ft. lbs. (50 Nm) plus an additional 90 degrees. Check the basic camshaft position and adjust if necessary.

   Timing chain tensioner with a new gasket and tighten to 59 ft. lbs. (80 Nm)

   Generator
4. Remove the camshaft locking plates.
   
   
   Exhaust system to the manifolds and tighten the mounting nuts to 15 ft. lbs. (20 Nm)

   Heater hose to the cylinder head

   Power steering pump

   Serpentine belt and remove the locking pin

   CMP sensor

   Vacuum switchover valve

   Intake manifold

   Cylinder head covers and tighten the bolts to 89 inch lbs. (10 Nm)

   Ignition coils and tighten the mounting bolts to 70 inch lbs. (8 Nm)

   Fuel pipe

   Air cleaner housing, resonance pipe and body

   Engine cover
5. Remove the guard plate from the radiator/condenser.
   
   
   Fan shroud, then the cooling fan
6. Fill the engine with coolant.
7. Connect the negative battery cable.
8. Read fault memory, encode the radio and normalize the power windows.
9. Start the vehicle and check for leaks.

These details will help.

Thanks.

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html