M7 nuts are not very common and certainly not with a hardness class 10. On our classic Volkswagens, they are mainly used in the gearbox and on type 4 engines, the rocker shafts are fixed with these nuts. The fact that a hardness class of 10 is used for these applications is not by chance.
Unfortunately, we still regularly find that standard M7 nuts are used. The nuts must continue to function under all circumstances, a standard M7 nut is not suitable for this, it will sooner or later lead to problems.
If a galvanized nut has been used, you can assume that it is not a class 10 nut. Don't take any chances and replace it with a class 10 steel nut.
Below is a list of where these M7 class 10 nuts are used and the total number required:
VW Beetle
-Thrust bearing assembly to 1973 (VIN 113 2700 229 ) 3 pieces
-Torque converter vacuum tank to 7.1967 4 pieces
-Assembly of the crankcase halves with the old type of gearbox 1 piece
-Mounting of the switch on the gearbox until 1974 (VIN 114 2794 034 ) 7 pieces
Karmann Ghia
-Assembly of the thrust bearing guide bush until 1973 (VIN 143 2700 229 ) 3 pieces
-Torque converter vacuum tank until 7.1967 4 pieces
-Assembly of crankcase halves until 7.1960 1 piece
-Switching device on gearbox 7 pieces
Split Bus
-Assembly of crankcase halves until 5.1959 1 piece
-Switching device on the gearbox 7 pieces
Bay Window Bus
-Assembly of the rocker shaft on Type 4 engines 8 pieces
-Assembly of the thrust bearing guide sleeve until 1973 (VIN 213 2194 781 ) 3 pieces
-Transmission nose cone on gear box 9 pieces
VW Vanagon
- Rocker arm shaft assembly for Type 4 engines 8 pieces
Type 3
-Thrust bearing 3 pieces
-Switching device on the gearbox 7 pieces7 pieces
-Adjustment nut for clutch cable until 1965 (VIN 315 158 979 ) 1 piece
VW Thing
-Thrust bearing from 8.1971 until 2.1973 3 pieces
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