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Oil leak is driving my nuts?


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#1 90FordBronco

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Posted 26 March 2008 - 12:15 PM

I bought the Bronco knowing it had several leaks. I pulled the motor and replaced just about every gasket: oil pan, timing cover, rear main, valve cover, intake, exhaust and head gaskets. I still have a leak (a bad leak) coming from the drivers side of the motor. The passenger side is bone dry and ill degrease and clean the drivers side drive it 10 mins down the road and its soaked, all the way to the front drive shaft. The front of the motor is clean and dry and from what I can feel the back of the motor is dry. We did see that the dipstick tube wasn't inserted all the way so we fixed that but could oil still be getting passed that? Could it be that the block is cracked? Im running outta ideas. I'd hate to have to pull it again.


If I have to pull it again..........anyone in Northeast GA got a decent 302 they wanna get rid of cheap?? :-"

Thanks.
1990 Ford Bronco 302 FI/auto.............needs some work.

#2 Justshootme84

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Posted 26 March 2008 - 01:39 PM

From your description, the dipstick tube is the first thing I'd suspect is causing your leak. Might read some of the suggestions in the other oil leak thread, JSM84

http://broncozone.co...showtopic=13777
1984 Bronco XLT, 460, C-6 AT, Dana60, Sterling 10.25", 36" GYR RT-II's on H1 rims, S&W Racecars 10-pt cage kit, PRP racing seats, tube doors, Herculiner, custom "shaker" assembly.

1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out

1986 Bronco Custom, 300-I6, NP435 4sp, Ford 8.8", new paint

1988 F-350, 4WD, 460 EFI, C-6Dana 60, Sterling 10.25 (donor)

1978 Bronco Custom, 351M, NP435, Currie Ford 9" w/ spool

1979 F-150 4WD, 351M, C-6, 4.10 gears w/ 35" mud tires

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#3 90FordBronco

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Posted 26 March 2008 - 03:32 PM

Thanks for the heads up. I looked at my dipstick tube and saw that it wasn't seated all the way in the block. But when I went to remove it it slide out with ease. I would have thought that it would have been kinda stuck since there is no gasket or o-ring on it to keep a seal. Well i pulled it out and cleaned it up and gooped up the flange area where it meets with the block with RTV since it seems to just wiggle around in the block. I'm going to let the RTV sit over night to cure up and add oil and try again tomorrow. If that fixes it then i'll try to locate a new dipstick tube and hope that it'll fit in the block nice and tight.
1990 Ford Bronco 302 FI/auto.............needs some work.

#4 Justshootme84

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Posted 26 March 2008 - 11:00 PM

That's very similar to the problem I had with my 84 Bronco. The previous owner had a garage replace the motor with a 1985 longblock (NAPA kit) that originally had the dipstick coming out of the block. I had to replace the original, rusty oil pan since it was leaking, too, and the new oil pan has the dipstick in it. The garage overlooked plugging the block dipstick hole, and oil was pouring out of it. Most sb and lb kits come with a plug for that hole, guess the garage forgot it (or the mechanic was too drunk-rant).If you have replaced the oil pan on your Bronco, check that it doesn't have a hole for the dipstick. I solved the problem by inserting a 5/16 bolt into the hole, wuth red Loctite to secure it. I know on the oil pan location, the tube mount has some small rivets to hold it. But for the engine block location, i think the tube just fits in there tightly. So, if you still have problems with the block location leaking, one solution would be to plug the hole and switch to an oil pan with the tube in it. JSM84
1984 Bronco XLT, 460, C-6 AT, Dana60, Sterling 10.25", 36" GYR RT-II's on H1 rims, S&W Racecars 10-pt cage kit, PRP racing seats, tube doors, Herculiner, custom "shaker" assembly.

1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out

1986 Bronco Custom, 300-I6, NP435 4sp, Ford 8.8", new paint

1988 F-350, 4WD, 460 EFI, C-6Dana 60, Sterling 10.25 (donor)

1978 Bronco Custom, 351M, NP435, Currie Ford 9" w/ spool

1979 F-150 4WD, 351M, C-6, 4.10 gears w/ 35" mud tires

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#5 90FordBronco

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Posted 31 March 2008 - 06:41 PM

Tracked down the leak. Replaced the dipstick tube and that didn't help, so i start tearing the drivers side of motor apart. I remove the exhaust manifold to make sure I don't have any visible cracks and feel up under the valve cover and see that part of the gasket slipped inside the cover. I pull the valve cover and the gasket above the #6 and 7 cylinder is oiled up and not sealing. I slip it into place and run a bead of RTV and bolt it all back together. VIOLA! No more oil leak.

Now I have to figure out why after it warms up my oil pressure wants to drop but motor doesn't make any odd noise. (I saw another thread about it) and hoping that there isn't anything to major with the tranny/rear-end. Seems to not drop into passing gear when climbing a hill, or downshifts too soon. And seems alil herky-jerky when going down the road.

Thanks for the leads.
1990 Ford Bronco 302 FI/auto.............needs some work.

#6 BroncoJoe19

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Posted 31 March 2008 - 07:40 PM

Tracked down the leak. Replaced the dipstick tube and that didn't help, so i start tearing the drivers side of motor apart. I remove the exhaust manifold to make sure I don't have any visible cracks and feel up under the valve cover and see that part of the gasket slipped inside the cover. I pull the valve cover and the gasket above the #6 and 7 cylinder is oiled up and not sealing. I slip it into place and run a bead of RTV and bolt it all back together. VIOLA! No more oil leak.

Now I have to figure out why after it warms up my oil pressure wants to drop but motor doesn't make any odd noise. (I saw another thread about it) and hoping that there isn't anything to major with the tranny/rear-end. Seems to not drop into passing gear when climbing a hill, or downshifts too soon. And seems alil herky-jerky when going down the road.

Thanks for the leads.

Yahoo!!! I love it when a plan comes together :)
Glad you fixed your leak.

Regarding the shifting issues. I also have a '90 bronco. I am hoping that you also have the E4OD trans. IF you do have a E4OD you have a Overdrive switch on your dashboard.
Pull Diagnostic codes...
http://www.fordfueli...s/self_test.pdf
and then read through this thread.
I had the SAME symptoms, and just fixed it yesterday!
The E4OD is computer controlled and there are a number of sensors that are invovled in controlling shift points. You have to make sure that they are all functioning properly.
Please see... http://broncozone.co...showtopic=13716
Good luck,
let us know how you make out.
joe
BroncoJoe19... I am not a professional mechanic, nor an engineer.
One should always obtain professional advice before attempting a repair or modification.

1990 Tan on Black Eddie Bauer - resides in North Jersey
302 with 33's on 15s E4OD Speedometer corrected trans
Auto hubs with manual transfer case snorkel

#7 90FordBronco

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Posted 31 March 2008 - 08:02 PM

So if I have just the AOD....i guess pull the codes and see whats going on. I see no OD switch anywhere.
1990 Ford Bronco 302 FI/auto.............needs some work.

#8 BroncoJoe19

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Posted 31 March 2008 - 08:19 PM

So if I have just the AOD....i guess pull the codes and see whats going on. I see no OD switch anywhere.

Hmmm my Haynes manual says that the E4OD supplemented the AOD in 1988.
My switch is to the right of the steering wheel, on the lower dash panel.

Definitely pull codes. You want her running as well as possible.
BroncoJoe19... I am not a professional mechanic, nor an engineer.
One should always obtain professional advice before attempting a repair or modification.

1990 Tan on Black Eddie Bauer - resides in North Jersey
302 with 33's on 15s E4OD Speedometer corrected trans
Auto hubs with manual transfer case snorkel

#9 BroncoJoe19

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Posted 31 March 2008 - 08:24 PM

Hmmm my Haynes manual says that the E4OD supplemented the AOD in 1988.
My switch is to the right of the steering wheel, on the lower dash panel.

Definitely pull codes. You want her running as well as possible.

I just went out to look at the sticker on my door panel, and found that the Trans Type was "E"
IF you get that letter code JSM or others will be able to tell you which trans you have.
BroncoJoe19... I am not a professional mechanic, nor an engineer.
One should always obtain professional advice before attempting a repair or modification.

1990 Tan on Black Eddie Bauer - resides in North Jersey
302 with 33's on 15s E4OD Speedometer corrected trans
Auto hubs with manual transfer case snorkel



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