TSB for '79 Toro THM 325 part 1
Posted: Sun Sep 20, 2009 10:58 pm
OK guys while looking through some of my junk including all types of printed material from the last 35 or so years I came across this TSB in MotorTech magazine Spring 1982 sooooooo being the nice guy I am I'm going to type it out here for you guys with Toros with 325's:
[color=#8000BF]Transmission oil leak. In some 1979 Toronado THM 325 transmissions, there may be interference between the oil pan and the sprocket cover, resulting in oil leaks. Due to this interference, the pan will not seat tightly against the pan gasket and case. The interference is cuased by the outside diameter of the washer head bolts squeezing the outer pan flange against the sprocket cover.
A redesigned bolt with a small washer head is now being used for production and is available at Olds parts counters. This smaller bolt will prevent the interference.
If an oil leak due to this pan interference is suspected, the first check to make sure that the leak is not actually at the oil-fill pipe-to-case conection. Due to the air stream effect, leaks in these areasmay appear to be located farther back on the trans.
Before attempting leak diagnosis, clean the underside of the trans. with solvent. After cleaning, test drive the car until it reaches normal operating tempature, and then allow it to sit for at least two hours. Check for oil leakage where the TV cable enters the case. If a leak is located at this connection, replace the TV cable seal. The seal is a multi-lip design, and it must be installed in the case before installing the TV cable. An oil leak from the TV cable seal may appear to be a trans.-pan gasket leak. Special care should be taken to determine the exact source of the leak.
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[color=#8000BF]Transmission oil leak. In some 1979 Toronado THM 325 transmissions, there may be interference between the oil pan and the sprocket cover, resulting in oil leaks. Due to this interference, the pan will not seat tightly against the pan gasket and case. The interference is cuased by the outside diameter of the washer head bolts squeezing the outer pan flange against the sprocket cover.
A redesigned bolt with a small washer head is now being used for production and is available at Olds parts counters. This smaller bolt will prevent the interference.
If an oil leak due to this pan interference is suspected, the first check to make sure that the leak is not actually at the oil-fill pipe-to-case conection. Due to the air stream effect, leaks in these areasmay appear to be located farther back on the trans.
Before attempting leak diagnosis, clean the underside of the trans. with solvent. After cleaning, test drive the car until it reaches normal operating tempature, and then allow it to sit for at least two hours. Check for oil leakage where the TV cable enters the case. If a leak is located at this connection, replace the TV cable seal. The seal is a multi-lip design, and it must be installed in the case before installing the TV cable. An oil leak from the TV cable seal may appear to be a trans.-pan gasket leak. Special care should be taken to determine the exact source of the leak.
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