Need Info????
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New User
Joined: May 2003
Posts: 7
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Need Info????
I own a 94 Navajo, generic Explorer. I am having problems with the transmission fluid disappearing. I think it is going into the engine oil, since my oil level has increased by 2 quarts. special note: if it is not transmission oil I think I will market my truck, because I never had a truck that PRODUCED oil.
Anyone out there that can give advise why this is happening would be appreciated. What do you think about the vacumm modulator on the transmission?
Anyone out there that can give advise why this is happening would be appreciated. What do you think about the vacumm modulator on the transmission?
Elder User
Joined: May 2003
Posts: 530
Likes: 1
From: Harrisonburg, VA
Need Info????
I your navajo does leak a little here and there it could be the pan gasket or the front pump seal on the input shaft. I took my 91 explorer 4 wheeling one time and I just had it in 4 high driving on a road through the mountains (I could've had it in 2wd) and next thing I new the transmission started slipping so I looked underneath and mine had pumped all the fuid out. So I had it towed back home and filled it back up and didn't drive it cause I have two vehicles. When I started to drive it again I checked the fluid every week till I got more confident on driving it. Neighbor is a mechanic he said it was the front pump seal leaking. Took it to have fixed and they said it was just the pan gasket, so they changed the fluid and filter but I'm still having to add fluid to it. Still have to get that seal replaced. If it's halfway inbetween the two marks on the stick sometimes it takes awhile for it to pick up the fluid and when you put it into reverse you sit for an extra couple of seconds till it catches. So I usually put a little over the full mark to make sure it's ok.
Elder User
Joined: May 2003
Posts: 530
Likes: 1
From: Harrisonburg, VA
Need Info????
oh yeah, forgot something. One quick thing, the transmission lines go through the radiator to the trans. cooler and it is very possible that the radiator has a leak inside thats letting the two mix.
Senior User
Joined: Mar 2002
Posts: 383
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From: southeast,usa
Need Info????
Check the vacuum modulator valve on the side of your transmission. It's on the passenger side behind the heat shield. Pull the vacuum line and see if there is oil in the line, it should be dry. You can check this at the vacuum tree at the back of the intake manifold or at the modulator itself. This little device has a diaphram inside that can develop pinhole leaks and when this happens the manifold vacuum pulls the tranny fluid into the engine.
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Need Info????
It's pretty hard for the transmission oil to get into the engine but it's easy for it to get into the transfer case through a leaky front seal. Check the transfer case oil and see if it's over full.
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New User
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Need Info????
Thanks everybody for your input. Taking the vehicle to dealer on Wednesday. I will pass on your info & I will let you all know what happens. I thought it might be the vacumm modulator, we will see.
Thanks
Thanks
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Joined: May 2003
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Need Info????
Well everybody, I had my truck fixed today. It was in fact the Vacumm Modulator. The mechanic told me that when he pulled off the vacumm hose, fluid poured out of it, so much it filled a soda bottle. With that said, I thank everybody who had input to my problem & I hope if someone else has this type of problem in the future, you all will remember this. I guess it is not impossible for transmission fluid to get into the engine oil.Thanks
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Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Need Info????
It must have been realllly shot.
Did you change your engine oil too?
And thanks for letting us know what you found
Did you change your engine oil too?
And thanks for letting us know what you found
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New User
Joined: May 2003
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Need Info????
I guess it was really shot, the fluid was getting into engine oil somehow. And Yes, they did change my oil & filter for me. The best part of it all was that it was FREE. Not bad on a used vehicle with 130,000 miles.
Side note: How do you post those photos of your vehicle??
Thanks
Side note: How do you post those photos of your vehicle??
Thanks
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