tbran
Guest
The 913c engine is used in many applications. The fan on most applications employs a thermostat located in the exhaust manifold which speeds up the fan and slows it via oil pressure to the 'torque converter' clutch in the fan drive. Best of my memory this is bypassed on the combines by removal of the washer in the control valve and locking in the clutch as soon as it is cranked. The 913c also uses a larger fan than most other applications. The loose play you talk about is usually the spool the fan needle brgs run on erroding and causing a rumble when the engine is shut down and the fan idles down. this is probably due to an imbalance on the fan cuased by dirt build up and a slight vibrantion results. During running this all turns the same speed and only the ball brgs rotate.