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The components of the cylinder head and the mating surface of the cylinder head and engine block are machined within very precise tolerances. The components must be thoroughly cleaned, inspected and if necessary properly lubricated upon installation. Refer to the Engine Reconditioning information in this section for additional information.
WARNING A camshaft removal tool should be used when removing the camshafts from the M42 engine and all E36 6-cylinder engines. Failure to use the proper tool or its equivalent could result in camshaft breakage. NOTE Both a camshaft and a crankshaft alignment tool are necessary when reinstalling the camshafts onto the cylinder head of BMW M42 engines and all E36 model engines. WARNING The cylinder head bolts used on E36 6-cylinder engines with a cast iron block are a different length and torque specification than those used on E36 6-cylinder engines with a cast aluminum block and must not be interchanged! E36 6-Cylinder Engines
NOTE It is not recommended to machine the cylinder head surface of the S52 engine. If machining the cylinder head of an M52 engine, a 0.012 inch (0.3mm) thicker head gasket is available for reassembly.
FIG : Cylinder head mounting bolt tightening sequence-E36 models with 6-cylinder engines
NOTE This is to prevent contact between the valves and the piston tops.
WARNING Use care to not drop any pieces of gasket or debris into the oil or coolant passages.
WARNING The cylinder head bolts may not be reused. NOTE The bolts are a different length and have a different torque specification for aluminum engine blocks than those for the cast iron engine blocks.
FIG : Cylinder head bolt torque sequencer-M20 engine
NOTE New Torx® head fasteners are required for cylinder head installation. Neither the Torx® head or the hex head fasteners can be reused.
NOTE With the No. 1 piston at Top Dead Center (TDC) of the compression stroke, make sure to align the timing marks when installing the timing belt. The crankshaft sprocket mark must point at the notch in the flange of the front engine cover. The camshaft sprocket arrow must point at the alignment mark on the cylinder head. BMW recommends that the timing belt be replaced every time the cylinder head is removed and/or the belt is disturbed. Make sure the belt is properly tensioned.
WARNING An improperly installed check valve will cause mechanical damage to the cylinder head. NOTE New cylinder head bolts must be installed, they cannot be reused.
NOTE During cylinder head or camshaft installation a waiting period is necessary before the camshaft timing chain can be installed to allow the hydraulic lash adjusters to bleed down and prevent the valves from contacting the pistons.
The waiting period varies depending on the work environment's ambient air temperature. The waiting period is as follows:
Above 68°F (20°C): 4 minutes 50-67°F (10-19.4°C): 11 minutes 32-49°F (0-9.4°C): 30 minutes
NOTE Make sure the vent hole on the thermostat faces up.
M44 1.9L Engines
the straight 6 is your engine
That's correct. But as I'm sure you know, most BMW engines were straight 6's! As I understand it this motor is the m52B28. I am particularly interested in any issues with removal and replacement of the head gasket as it relates to that motor!? Thanks, Glenn
ok..sorry for the delay..storm here
this is the m52 engine
M52 2.5L, 2.8L, And S52 3.2L Engines
FIG : Cylinder head torque sequence-M52 2.5L, 2.8L, S52 3.2L engines
you are welcome
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