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Three more seals. One on the shift shaft, another under the water pump and one more at the bottom of the engine on the main drive shaft. There is also a large o - ring on the carrier. Chances are the shift shaft seal is leaking.
You don't give make or model. Here goes , The engine has a rear maim seal behind the fly wheel if it leaks the leak will be from the clutch housing. It has a front seal behind the crank shaft timing cover.it can leak from there . it can leak from the oil filter and oil pressure switch . Can also leak from the top timing cover gasket and cam shaft seals.
oil leaks from underneath can come from front crank shaft seal --rear crank shaft seal --oil filter--sump gasket---power steering ---leaking rocker cover gaskets ---leaking oil pressure switch.--transmission seals. I suggest that you have the engine professionally cleaned and then put it on a hoist while running to see where the oil is from
Presuming you are talking about an oil leak from behind a pulley? All shafts as they exit the engine, have an oil seal fitted in the case and supply a tight seal to the shaft, if oil is leaking the seal is worn and needs replacing. depending on what the pulley is driving (cam belt), it could be a big job.
Check the sump gasket at the rear of the sump tension sump bolts. Check that the rocker cover gasket is not leaking down the back of the engine and giving the appearance of a sump leak. Rear crank seal would be another point of leak and front input shaft (clutch shaft) seal leaking. Check the engine oil level and correct if necessary and check gear box oil level and correct if necessary. If you have an auto the oil will be pinkish and indicates a torque converter to gear box seal leaking.. Either of the shaft seals will require the box removal for repair.
Spray it off at the car wash to remove all the oil , then spray Right Guard (Yes, that Right Guard) on the area of the leak. It will show up, but you may not be able to see exactly where. There are a couple spots where it can leak. The jackshaft oil seal, as you said, transmission output shaft (clutch shaft) on the trans itself, the inner primary seal where the trans shaft runs thru, the engine sprocket shaft oil seal, inner primary O-ring, the bolts that hold the inner primary to the engine/trans, the primary chaincase gasket and the drain plug. Hopefully when you get it apart, you will see which seal is leaking. If not, replace them all. Still want to fix the leak? LOL
i really dont worry about the leak near the shaft because with out the oil in the shaft there is a possibility that the shaft can jam. even dewalt new hammer when you purchase it come with the grease/lube like a toothpaste size. this is to lube the bits for the purpose the bit/shaft can move freely & also can hammer freely. our you can do is to dis-assemble the front end sleeve & remove the excess oil.will i agree weather can also change the viscosity of the oil. varsol cleaner can do the trick available at walmart.
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