Tractor Repair: Allis chalmers 160, clutch alignment tool, rear main oil seal

Question
QUESTION: I am looking at an ac 160 that has an "oil" leak between the engine and transmission were the tractor bolts together would you guess that I have a rear main oil seal leak and if so how hard is it to "split" the tractor and replace the seal? And is there anything else that could cause the leak?? Thank you for the info.

ANSWER: Hello,

  It could be either the rear crankshaft seal on the engine, or the input shaft seal in the transmission.  It would be a good idea to replace them all and check the condition of the clutch when the tractor is split.  They are a fairly easy tractor to split.

---------- FOLLOW-UP ----------

QUESTION: thank you very much as far as the clutch goes can I rent the tool from napa or do i have to special order the tool via ac? I do not have to remove the crankshaft to do this? is this right? as far as i can see in the manual it looks like i have to remove the clutch and flywheel to get to the rear main seal??? you have been a great help.
Richard

Answer
Hello,

  The clutch and flywheel must be removed to get to the rear crankshaft seal.  The crankshaft does not have to be removed.  From the information that I found, it is not a one piece seal with a rubber lip like most oil seals.  It is a 2 piece rope type seal.  The seal housing must be removed from the rear of the engine, and then the new rope seals must be properly seated into the seal housing before it is installed on the engine.  Your manual should tell you the proper procedure for this.  I do not know what tool you are looking for.  Maybe a clutch alignment tool for holding the clutch disk in position when installing the flywheel?  I don't know where you can get one to fit your clutch, but there are some universal ones available that adjust for different sizes.  Napa might possibly have something, but I don't know for sure.  A tractor dealership or repair shop might have one that you can borrow or rent.  I have had to make some to fit machines that I have repaired.  I made them out of a wooden dowel and made them smaller in the necessary places with a lathe, and made them bigger where they had to be by wrapping them with tape.