Front Axle Blowing Out Fluid - Ford Truck Enthusiasts Forums



1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

Front Axle Blowing Out Fluid

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 01-14-2018, 03:18 PM
1974xlt's Avatar
1974xlt 1974xlt is offline
Junior User
Thread Starter
 
Join Date: Jul 2013
Posts: 75
1974xlt is starting off with a positive reputation.
Front Axle Blowing Out Fluid

I have a rebuilt front dana 44 axle on a '79 F250 frame and it is blowing fluid out of the vent hose. With over 700 miles on the truck now I thought it would eventually stop but it continues. I've had to tie a ziplock bag to the hose so I'm not wiping off the pumpkin it drips on every day. I figure I've lost a pint or more now. I wouldn't think the shop overfilled it and I haven't even used the 4X4. So what is causing the over pressure?
Reply With Quote
  #2  
Old 01-14-2018, 06:50 PM
HIO Silver's Avatar
HIO Silver HIO Silver is online now
Post Fiend
 
Join Date: Dec 2009
Location: NorCal
Posts: 20,241
HIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud of
Pressure is caused by heat.

Rebuilt?.. Not by you? I bet it is in fact overfilled. With the axle cold, remove the drain plug and let it drain to find level ... and full.
Reply With Quote
  #3  
Old 01-14-2018, 07:59 PM
willowbilly3 willowbilly3 is offline
Post Fiend
 
Join Date: Jun 2003
Location: Black Hills of SD
Posts: 7,804
willowbilly3 has a great reputation on FTE.willowbilly3 has a great reputation on FTE.willowbilly3 has a great reputation on FTE.willowbilly3 has a great reputation on FTE.willowbilly3 has a great reputation on FTE.willowbilly3 has a great reputation on FTE.
Quote:
Originally Posted by HIO Silver View Post
Pressure is caused by heat.

Rebuilt?.. Not by you? I bet it is in fact overfilled. With the axle cold, remove the drain plug and let it drain to find level ... and full.
don'y you mean remove the fill plug?
Reply With Quote
  #4  
Old 01-14-2018, 08:09 PM
fe390pc's Avatar
fe390pc fe390pc is offline
Posting Guru
 
Join Date: Mar 2009
Location: Maryland
Posts: 1,561
fe390pc has a good reputation on FTE.fe390pc has a good reputation on FTE.fe390pc has a good reputation on FTE.
Technically they are one in the same. There is only one plug on the 78/79 D44 axles. Just remove the plug and in fluid comes out it was over filled! The second question is how long is your breather hose? Is it the original one that ties up to the frame?
Reply With Quote
  #5  
Old 01-14-2018, 09:41 PM
HIO Silver's Avatar
HIO Silver HIO Silver is online now
Post Fiend
 
Join Date: Dec 2009
Location: NorCal
Posts: 20,241
HIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud ofHIO Silver has much to be proud of
Quote:
Originally Posted by willowbilly3 View Post
don'y you mean remove the fill plug?
Yeah same difference.
Reply With Quote
  #6  
Old 01-15-2018, 12:05 PM
1974xlt's Avatar
1974xlt 1974xlt is offline
Junior User
Thread Starter
 
Join Date: Jul 2013
Posts: 75
1974xlt is starting off with a positive reputation.
Thanks for the input guys. I'll open the diff plug tomorrow and check. Just didn't think a company that specializes in axles would make that mistake, or that it was physically possible to overfill. In regards to the vent hose question, I did replace it and attached it back on the original clamp under the engine mount bracket. It is approximately 14 inches in length.
Reply With Quote
  #7  
Old 01-15-2018, 12:09 PM
JakeHan JakeHan is offline
Senior User
 
Join Date: Jun 2005
Posts: 384
JakeHan is starting off with a positive reputation.
Locking hubs? Are you sure they're out?? If one isn't disengaging, it might be backspinning the differential, that'd make a pile of heat and really be slinging oil around in there..... Does it smell hot/burnt at all?
Reply With Quote
  #8  
Old 01-15-2018, 12:38 PM
1974xlt's Avatar
1974xlt 1974xlt is offline
Junior User
Thread Starter
 
Join Date: Jul 2013
Posts: 75
1974xlt is starting off with a positive reputation.
The fluid collecting in the bag looks very clean with no burnt smell. However I'll lift the front axle and check the lockouts, thanks.
Reply With Quote
  #9  
Old 01-16-2018, 11:38 PM
1974xlt's Avatar
1974xlt 1974xlt is offline
Junior User
Thread Starter
 
Join Date: Jul 2013
Posts: 75
1974xlt is starting off with a positive reputation.
I checked the fluid level and its about 1/2 inch below the fill plug hole, so that seems okay to me. Lifted the frontend and confirmed both lockouts are "free". Are there any other thoughts/ideas on my over pressure issue?
Reply With Quote
  #10  
Old 01-16-2018, 11:57 PM
77&79F250's Avatar
77&79F250 77&79F250 is online now
Used OEM parts guy
 
Join Date: Feb 2007
Location: S/W Missouri
Posts: 27,090
77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.77&79F250 has a spectacular reputation.
What KIND of fluid is in it? For sure 80/90 gear lube or possibly some thing thicker?
Reply With Quote
  #11  
Old 01-17-2018, 12:01 AM
1TonBasecamp 1TonBasecamp is offline
Elder User
 
Join Date: Jul 2017
Location: San Jose, CA
Posts: 799
1TonBasecamp is starting off with a positive reputation.
And no chance the oil is coming from somewhere else and simply hitting the end of the vent hose?
Reason I ask is that with nothing spinning in there, you should not have any fluid pushing out of the tube. Whether it's from splash, heat expansion, over-pressurization, or what, it only happens when something is moving. Stirring things up, so to speak.

If the vent was plugged, you'd get oil out of the axle seals and nothing out of the hose obviously. So over-pressurization does not seem to be possible. Unless...
You didn't happen to have an ARB installed by the shop, did you? If so, what about air coming in from the compressor?

Paul
Reply With Quote
  #12  
Old 01-17-2018, 05:46 AM
buckin69bronco's Avatar
buckin69bronco buckin69bronco is offline
Elder User
 
Join Date: Aug 2010
Location: Bothell
Posts: 535
buckin69bronco is starting off with a positive reputation.
With the hubs unlocked do you have the transfer case in 4x4?
Reply With Quote
  #13  
Old 01-17-2018, 08:23 AM
Jklnhyd's Avatar
Jklnhyd Jklnhyd is online now
Posting Guru
 
Join Date: Sep 2013
Location: Pasadena, Ca
Posts: 2,495
Jklnhyd is a name known to allJklnhyd is a name known to allJklnhyd is a name known to allJklnhyd is a name known to allJklnhyd is a name known to allJklnhyd is a name known to all
With the tc case disengaged, and the wheel hubs disengaged, there should be nothing turning inside the differential at all. If everything is proper, and 4x4 is engaged and working, fluid should still not be fartin' out the vent. There should not be "pressure" if the vent is working and unobstructed. Maybe it is obstructed? There has to be movement inside the differential to create heat, so your hub(s) are engaged or your tc is, and the vent has to be obstructed to fart out fluid.

You made sure the hubs are disengaged by jacking it up and spinning each wheel and making sure the driveshaft did not spin. Now, verify that the transfer case is not engaged by turning it by hand.
Reply With Quote
  #14  
Old 01-17-2018, 09:22 AM
1974xlt's Avatar
1974xlt 1974xlt is offline
Junior User
Thread Starter
 
Join Date: Jul 2013
Posts: 75
1974xlt is starting off with a positive reputation.
The fluid I'm using I believe is 75/90 synthetic. Rechecked the lockouts and front driveshaft are free. The axle is stock, no ARB. Fluid definitely coming from vent hose as I have zip tied a bag to the end to collect the blow out. The fluid collecting in the bag seems to be slowing down. What is the minimum amount of oil I can get by with in the axle? I'll check the axle vent nozzle next for obstruction again.
Reply With Quote
  #15  
Old 01-17-2018, 10:20 AM
JessyJ's Avatar
JessyJ JessyJ is online now
Senior User
 
Join Date: Oct 2017
Location: british columbia, canada
Posts: 120
JessyJ is starting off with a positive reputation.
If the vent is plugged I dought oil would oil would be coming out of it, it would be coming out somewhere else.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another 2000 Ford Expedition with heater problems husky390 1997-2006 Expedition & Navigator 12 01-06-2018 10:00 PM
2008 Explorer - Passenger side blows warm, drivers is cold naiku Explorer, Sport Trac, Mountaineer & Aviator 0 08-16-2017 09:27 AM
Anybody else blow a trans hose? 2012 6.2 F250 25Kmiles? justjake 1999 to 2016 Super Duty 5 07-07-2017 07:21 PM
Which rear axle differential vent hose + valve? 2000 Ranger rogerranger2122 Ranger & B-Series 9 10-03-2016 10:22 PM
2000 E-150 rear brake line tee. 2000Ford2000 1968-2013 Full Size Vans 16 03-01-2016 09:19 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 11:03 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.