Transmission General
M66 is a six gear manual transmission. All gears, including back-up (reverse), are synchronized. The transmission is intended to be part of a transverse drive line with front wheel or four wheel drive.
The transmission is built together with the final driven in a common aluminum housing. This unique construction makes the transmission very compact while enabling it to transmit high torque.
The engine and transmission have damped mountings, either on the side members with pendulum mounting or on a sub frame.
The transmission and final drive are extremely compact.
The oil is synthetic and does not normally need to be changed. The oil is heat resistant and tolerates high loads. The hole in the level plug is used to top up the oil and check its level. The oil is drained through the drain plug in the base of the transmission.
The gear wheels are located on four shafts. They are:
- input shaft (A)
- intermediate shaft 1-2, 5-6 (B)
- intermediate shaft 3-4 (C)
- back-up (reverse) shaft (D).
The clutch gears are welded directly to the idler wheel to shorten the length of the shaft. To further shorten the length of the transmission, needle bearing with inner rings are used instead of snap rings.
The inner rings sit on the shaft inside the idler gears and extend lengthwise a little outside each idler gear. When the components on the shafts are pulled together the inner rings counterhold, so that the idler wheels have the clearance that they require to rotate.
The components of the input shafts are pulled together with a bolt located in the end of the shaft. Components of intermediate shaft 3-4 are held together with a press joint and a bolt located in the end of the shaft. The components of intermediate shaft 1-2, 5-6 are held together with the press joint of the 5th and 6th gear pinion.