Porsche 928 Workshop Manual page 159

928
Engine, Crankshaft Drive, Pistons
13
Honing
Remove the upper guide shoe for all honing and lapping processes.
The excess must be removed from the bronze strip of main guide shoe No.
3 until the strip is flush with the guide shoe - base.
Machine
Settings
Rough milling - see settings in column 1 of table.
Finishing - see settings in column 2 of table.
Polishing - see settings in column 3 of table.
Lapping - to lay bare the silicon crystals.
l.Adjust the machine to the settings in column 4 of the test sheet.
2.Remove all abrasive particles from previous honing with filtered hon-
ing oil.
3.Wipe the cylinder bores dry and apply a thin coating of thoroughly
mixed silicone compound.
Note
If the silicone compound is too thick,
honing oil and mixing thoroughly.
it can be thinned by adding fresh
4.Holders with felt strips are now set into the grinding head instead
of the guide shoes and honing stones.
Use a setting gauge to adjust the head to the cylinder diameter in
the same way as when working with guide rails and honing stones.
5.Soak the felt in filtered honing oil and apply a coating of sili-
cone compound.
6.Turn off the supply of grinding oil,
grinding oil.
the cylinders are lapped without
a
Printed in Germany - XII, 1986
Remachining Cylinder Bores
13 - 27