 Help diagnosing Tranny leak |
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| RonnieJ |
 Dec 7 2009, 09:51 AM
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#1
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RonnieJ  Group: Members Posts: 230 Joined: 16-June 03 From: Sterling Heights, Michigan Member No.: 829 Region Association: Upper MidWest  |
My 75 914 was in staorage for quite a long time and now that it is out of tstorage the valves are now properly adjusted the carbs have been cleaned and in sync and it runs beautifully. I do have some clutch chatter and I have a leak coming from somewhere in the front of the tranny. I know I will have to replace my clutch disc which I have no problem doing and am wondering which seal is normally the culprit and if you have ideas could you please pass them along to me. It is hard to tell if it is Transmisssion gear oil or moto oil.
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| dangrouche |
Dec 7 2009, 10:11 AM
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#2
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dangrouche Group: Members Posts: 550 Joined: 1-May 04 From: San Francisco Bay Area Member No.: 2,012 Region Association: None |
you have to smell the oil; tranny oil is stronger and stinky smell when compared to motor oil. tranny oil is also thicker than SAE20-50 or SAE30. touch a drop between two fingers and sniff. The only seal back there for the tranny is the input shaft, which I believe is higher than the input shaft seal and hard to remove unless the input shaft is removed (tranny apart). i have never had a leaky input shaft seal. your likely candidate would be your flywheel crankshaft seal, about 3 inches in diameter. you will need to change the O ring , the felt washer as well when you are in there. these are the bare minimium items to change when the tranny and motor is undocked. go to the pelican board for technical writeup for a clutch change.
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| dr914@autoatlanta.com |
Dec 7 2009, 10:20 AM
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#3
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914 Guru Group: Members Posts: 7,864 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
QUOTE(dangrouche @ Dec 7 2009, 09:11 AM)  you have to smell the oil; tranny oil is stronger and stinky smell when compared to motor oil. tranny oil is also thicker than SAE20-50 or SAE30. touch a drop between two fingers and sniff. The only seal back there for the tranny is the input shaft, which I believe is higher than the input shaft seal and hard to remove unless the input shaft is removed (tranny apart). i have never had a leaky input shaft seal. your likely candidate would be your flywheel crankshaft seal, about 3 inches in diameter. you will need to change the O ring , the felt washer as well when you are in there. these are the bare minimium items to change when the tranny and motor is undocked. go to the pelican board for technical writeup for a clutch change. the 901 seal is easy to remove the early 72 73 915 is the one where the shaft has to be removed! |
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| jaxdream |
Dec 7 2009, 10:40 AM
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#4
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Senior Member Group: Members Posts: 974 Joined: 8-July 08 From: North Central Tennessee Member No.: 9,270 Region Association: South East States |
Ifen you do pull the trany , check your clutch fork piviot that is sometimes a leaky point as the hole for the stud goes through into the gear housing where the oil could come from, just an FYI thing, good luck.
Jaxdream |
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