Permissible roughness of mating face: 0,03 mm Max. depth of material removed: 0,2 mm peak-to-valley height = 0,015 mm
Engine type M 28.43/44/45/46/41/42/47
Installing Cylinder Head (32-valve engines and M 28.21/22) Cylinder head attached by means of threaded studs
Installing Cylinder Head
Torquing sequence (4 steps) see Fig.
Sequence for removal: reverse
2nd step 90° of rotation 3rd step 90° of rotation 4th step 90° of rotation
1 st step 20 Nm
Installing Cylinder Head (32-valve engines) Hexagon cylinder-head bolts
The cylinder head can also be installed with the engine in place. If both cylinder heads are to be removed and installed, it is advisable to remove the engine first.
Torquing sequence (3 steps) Sequence for removal: reverse 1st step 20 Nm
2nd step . 90° of rotation 3rd step 90° of rotation
As a rule, do not use lubricant when Mod. 89 onward new cylinder head installing the cylinder-head nuts or screws hex bolts and washers. new screw length 20 mm longer
It is only necessary to apply a light M 12 x 199
coat of engine oil to the stud bolts M 12 x 149
or hex bolts.
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