John124 Posted October 6, 2006 Share Posted October 6, 2006 I have a 1991 Pathfinder SE that is constantly losing hydraulic fluid for the manual transmission. Obviously, it must be leaking some where, but I stumped as to where. The line from the master cylinder/reservoir, all the way up to the transmission seems fine -- no evidence of leaking. Someone once mentioned that it could be leaking behind the firewall. Is this possible? Any help, comments, and suggestions would be greatly appreciated. John Link to comment Share on other sites More sharing options...
94extreme Posted October 6, 2006 Share Posted October 6, 2006 have you looked anywhere else besides the hose under the hood?that's where the engine resides.. tranny is under the truck.. Link to comment Share on other sites More sharing options...
RedPath88 Posted October 6, 2006 Share Posted October 6, 2006 (edited) Umm.. MZ, I do believe he is referring to the clutch fluid ;) Yes it is possible for the fluid to leak out the back of the master cylinder and into the passenger compartment. From there it would likely run down/drip down onto the floor board. However, one would think that eventually you would be able to smell it inside.... if not see it. Is the carpet wet or damp under the pedals? Even if it is not, look up in there and pull the carpet back and have a look. Does your clutch work normally? I trust you have completely inspected the slave cylinder mounted to the side (just for MZ ... it's on the "bottom" offset to the right side) of the transmission. Edited October 6, 2006 by RedPath88 Link to comment Share on other sites More sharing options...
94extreme Posted October 6, 2006 Share Posted October 6, 2006 lol.. not one mention of the clutch red88.. where is the slave cylinder? lmao.. Link to comment Share on other sites More sharing options...
RedPath88 Posted October 6, 2006 Share Posted October 6, 2006 lol.. not one mention of the clutch red88.. where is the slave cylinder? lmao.. I beg to differ -thnkboutit- I have a 1991 Pathfinder SE that is constantly losing hydraulic fluid for the manual transmission. Obviously, it must be leaking some where, but I stumped as to where. The line from the master cylinder/reservoir, all the way up to the transmission seems fine -- no evidence of leaking. Someone once mentioned that it could be leaking behind the firewall. Is this possible? To me, that all screams clutch Link to comment Share on other sites More sharing options...
94extreme Posted October 6, 2006 Share Posted October 6, 2006 when one screams in the forest, does another hear him/her if they are in the city? no clutch that i can see.. and really, what's wrong with my first advice? it's spot on, no? does fluid leak upwards? Link to comment Share on other sites More sharing options...
RedPath88 Posted October 6, 2006 Share Posted October 6, 2006 I never said there was anything "wrong" with it, I just have a different take on what he said.... now quit making useless posts Link to comment Share on other sites More sharing options...
Animal Posted October 6, 2006 Share Posted October 6, 2006 Sounds like someone skipped their nap today. John, how much fluid are you loosing, how often do you have to add more? Link to comment Share on other sites More sharing options...
94extreme Posted October 6, 2006 Share Posted October 6, 2006 shoot, i haven't slept all week. but yes, let's return to matters at hand.. there are at least a couple of posted questions that may lead to something.. hopefully a solution to the initial querry. Link to comment Share on other sites More sharing options...
John124 Posted October 6, 2006 Author Share Posted October 6, 2006 Sorry for the ambiguity of my original post -- new to this site. Yes, I'm referring to hydraulic fluid for the clutch. Again, I apologize for not using the most appropriate lingo. This condition has been going on for a while. It use to be that a full reservoir would last a month, and I just kept an eye on it. But nowadays, it'll run dry in less than a week if I don't stay on top of it. When the reservoir has fluid, the tranny operates perfectly. But if I ever run it dry, the transmission will get increasingly difficult to shift to the point where you can't shift any longer, and there is no longer resistance in the clutch pedal. Then simply adding fluid back into the reservoir and pumping the clutch pedal several times, and everything is fine again. So if fluid is indeed leaking behind the firewall, the master cylinder is faulty and replacing it will solve this problem? Thanks again for the comments and insight. I'm a relative novice here. Link to comment Share on other sites More sharing options...
Animal Posted October 6, 2006 Share Posted October 6, 2006 It does sound like either the master or slave cylinder. If the carpet is damp (slightly oily) behind the clutch pedal, replacing the master cylinder should fix it. If the carpet is dry, check the slave cylinder. Pull the dust boot back and check for fluid (can also do this on master cylinder). If replacing the master cylinder, bench bleed the new part before installing it. Bleed the whole system after replacing either. Link to comment Share on other sites More sharing options...
RedPath88 Posted October 6, 2006 Share Posted October 6, 2006 John, there is no need to be sorry... I knew what you meant In addition to what Animal said, you need to get this fixed as soon as possible. By allowing it to run low enough to pull air into the system (it does not even need to by run "dry") it has negative effects on your clutch. Not only does it make it harder to shift, but it will also promote wear on your clutch disk, resulting in the need to replace the clutch much sooner that it should need to be. That wear is caused by the clutch not being fully disengaged when you depress the pedal, causing it to slip against the pressure plate at a point where it should not even be touching it. This also creates a large amount of heat, which can cause the pressure plate to fail early as well. Link to comment Share on other sites More sharing options...
unccpathfinder Posted October 7, 2006 Share Posted October 7, 2006 i had a slave cylinder boot bust on me...everytime i hti the cltuch it would work but it was leaking out that amount every time...good thing about that is i never had to bleed it...it bled itself so adding fluid got it fixed till i had time to change it... Link to comment Share on other sites More sharing options...
John124 Posted October 7, 2006 Author Share Posted October 7, 2006 Once again, thanks for the comments... this is a a great site! I just checked the area underneath the clutch pedal, and sure enough, I found where the clutch fluid was going to. I've been driving with this condition for quite a long time, and just recently found this site. Thanks again. Link to comment Share on other sites More sharing options...
RedPath88 Posted October 7, 2006 Share Posted October 7, 2006 Cool, glad we could help Link to comment Share on other sites More sharing options...
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