Help

[Jameshs]

I have just fitted a thorpe diff to my blackfoot and its just slips it has no drive. how much should i tighten it by? and should i use any sort of grease in it? help

[pleiku68(2)]

Can't believe with all the knowledge in this club that no one jump on your problemm...Is the diff new or old??..If old make sure the plates are not grooved..If new tighten the diff till the screw is snug and the ball diff is tight hard to turn...back the screw about 1/16 or less of a turn and keep doing this till you are happy...If it is still sliping when the screw is snug you probably have worn plates..if it's an old diff and don't..don't use too much grease..

quote:Originally posted by Jameshs

I have just fitted a thorpe diff to my blackfoot and its just slips it has no drive. how much should i tighten it by? and should i use any sort of grease in it? help

---

id="quote">id="quote">

[oldfrogshot]

Hi, Jameshs - This website has a very good description with drawings of the workings of a ball diff, so you can have a better idea:

http://www.rctek.com/general/differential_...escription.html

Don

[Jameshs]

its an old diff what sort of grease should i use and is there anywhere i could get a rebuild kit in the UK for it?

thanks

[sosidge]

I don't know exactly how the Thorp diff is built, but use silicone grease on the main balls and washers - just a thin layer (Tamiya call it Ball Diff Grease). Use normal grease on the thrust assembly - plenty of it (Tamiya Ceramic Grease would suffice).

A full rebuild kit for a diff of that age will be very hard to find. Probably the balls will be a standard modern size (most diffs use a combination of 2mm, 3/32 and 3mm balls). The plates will be harder to find, if they are badly grooved you may be able to finely grind them down yourself, but you need to grind them totally flat, perhaps make a flat board with fine wet and dry paper to rub the ring down on.

[Jameshs]

one side is worn but the other is fine, i have access to a surface grinder so that should not be too much of a problem.

anymore ideas??

[pleiku68(2)]

Once the plates are smooth then its just the adjustments..So you are in the hunt with the surface grinder..Remember FLAT and SMOOTH is the key...

quote:Originally posted by Jameshs

one side is worn but the other is fine, i have access to a surface grinder so that should not be too much of a problem.

anymore ideas??

---

id="quote">id="quote">

[Shodog]

Can you just flip the ring around? Just for good measure, I would replaced the center screw with a new one with a slight bend in it.