RC Giant Scale Cars For all those who love driving large scale rc cars share your projects or ask questions here.

Firehammer diff leaking

Reply

Old 07-10-2007, 06:36 PM
  #1  
NitroBurn1
Senior Member
Thread Starter
 
Join Date: Nov 2006
Location: , CO
Posts: 554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Firehammer diff leaking

From the first day that I ran my buggy, the diff has leaked grease. I sealed it with silicone, and it helped for awhile, but now today it is leaking again. Anyone else have this problem, and how do I fix it?
NitroBurn1 is offline  
Reply With Quote
Old 07-10-2007, 06:46 PM
  #2  
Slammed
Senior Member
 
Slammed's Avatar
 
Join Date: May 2007
Location: Vernon, CT
Posts: 260
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

to be honest I did not know there was grease in the rear diff so maybe thats why mine blew up [:@][:@][:@]
Slammed is offline  
Reply With Quote
Old 07-10-2007, 06:48 PM
  #3  
MrMikeG
Senior Member
 
Join Date: Sep 2005
Location: Mildura, AUSTRALIA
Posts: 2,056
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

Petroleum products eat through Silicone, as you found out. Seal it with RTV sealant or use silicone grease.
MrMikeG is offline  
Reply With Quote
Old 07-10-2007, 11:12 PM
  #4  
NitroBurn1
Senior Member
Thread Starter
 
Join Date: Nov 2006
Location: , CO
Posts: 554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

Its not leaking out the silicone sealed side yet, its coming out the side with the gear. The leak is not near as bad as it was the first day I ran it, but it still does it a little. Befor I sealed the diff there was grease all over the chassis, and engine. I am wondering if I just have a bad diff, or if its another Firehammer problem? If anyone else has had this problem, please let me know how you fixed it.

NitroBurn1 is offline  
Reply With Quote
Old 07-11-2007, 12:33 AM
  #5  
motors4fun
Member
 
Join Date: Jun 2007
Location: virginia, VA
Posts: 91
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

Do you have the little screw on the side of it that holds the cover snugly up against the gear side? i used the red disc brake grease on my diff after i had the output shaft welded to the spider gear and have had no problems at all with leaks.
motors4fun is offline  
Reply With Quote
Old 07-11-2007, 08:45 AM
  #6  
kengentry5000
Senior Member
My Feedback: (2)
 
kengentry5000's Avatar
 
Join Date: Jul 2005
Location: Greensboro, NC
Posts: 1,331
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

I'm suprised you have grease seeping out. I wonder if you have a problem with water getting inside causing the grease to seep out. I use Lucas 'Red-n-Tacky' grease on my diff gears and couldn't imagine as thick as that stuff is having it seep out. Have you disassembled the diff to see if there is water or moisture inside causing the grease to seep out?

Hey motors4fun, did you weld the outdrive cup to one of the bevel gears inside the diff? Was one of these stripped? Hadn't heard of someone having to do this before.
kengentry5000 is offline  
Reply With Quote
Old 07-11-2007, 09:30 AM
  #7  
motors4fun
Member
 
Join Date: Jun 2007
Location: virginia, VA
Posts: 91
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

I welded the outdrive to the drive gear. It was stripped and I could not find any more outdrives so i was stuck for a while. This setup is holding up perfectly and now if it goes I have a complete set up, diffmounts and all. The problem is though, when you wled it in like that, there is no way to get the bearings off that side.
motors4fun is offline  
Reply With Quote
Old 07-11-2007, 04:25 PM
  #8  
NitroBurn1
Senior Member
Thread Starter
 
Join Date: Nov 2006
Location: , CO
Posts: 554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

Maybe I need thicker grease? The grease that came in it slung all over, so i packed the diff with the same grease I use on the flex cable in my boat. How much grease do you guys use, because i might have used to much?
NitroBurn1 is offline  
Reply With Quote
Old 07-11-2007, 05:20 PM
  #9  
motors4fun
Member
 
Join Date: Jun 2007
Location: virginia, VA
Posts: 91
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Firehammer diff leaking

I used a pretty good amount of wheel bearing grease (high temp disc brake stuff). no problems here.
motors4fun is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service