Diff Problems

[Prommy]

Hi guys,

I have a couple of problems with my diffs

Firstly they seem to always leak doesn't matter what i do with the gaskets or shims inside,
can leak through where the gear joins to where the screws go in and where the drives come out each end.

Secondly the teeth seem to wear or break in it and where cog meets the pinnion.
Checked other pages about clearances and such but have it so its full teeth to teeth.

Any help would be appreciated.

[razzor]

After you rebuilt the diffs, did it feel smooth ??
The orings on the out drives also need replacing if they feel a bit a hard and will leak.
I usually rub the orings with rubber grease before assembly.

Once you fill the diffs and tighten them up leave one side for at least 15 mins and then give them a final tighten. Noticed that especially with the thicker oil they get packed and the diff cant compress completely hence i give them a chance to seep the excess .
Also make sure that when you tighten them that the diff gear is running as true/strait as possible.

[hakmazter]

Are you making sure when you reattach the drive joint to the pinion on the outside that it is tight and there is no play for the pinion to move around? I have seen first hand if the pinion can move in and out, it creates problems with the ring gear. I learned that one all by myself.

[badrun]

have same Problem with diff put new orings in them and were right .
But with diff gear brakeing teeth my have done the same ,have done front+rear and when i put them in i had lees than a mill play with diff+pinnion.Thinking off puting in stronger diff but dont no what will fit.
As prommy said any help would be appreciated.
chers
badrun

[cold_reboot]

Do you have the K8T or the Buggy Badrun? (Does the Buggy and Truggy share the same Diff. gears?, I don't have the Buggy so I don't know a lot about it.)

[badrun]

i have the buggy

[razzor]

Both buggy and truggy have the same diffs.
The kit comes with a thin gasket fitted and extra gaskets in a packet.
You would need to change or add gaskets like you would shim clearance on parts to get a smooth diff action.
The std gasket i found on mine was to thin and made the diff feel rough after adding another thin gasket they were fine.Have had no diffs strip on my cars or any customers.
Always shim the diff and pinion gear to get a good smooth mesh.
There are shims included with the kit as well.

[mikey]

ｈｉ　ｔｈｅｒｅ！！　 talk to HAK, about it,

you shouldn't have the diff issues, unless you do the little detail wrong, so it can cause you some problems. as you know some times a 0.1mm shim can kill your diff

[vnmsgt]

I seem to have problems keeping the diffs from leaking. Replaced o-rings and everything. Just redid it and again so I will wait and see. They leak from the Diff cup o-ring and not the ring gear. Everytime I open my diffs after a couple races there dry!

[razzor]

try using a shock oring instead or the black oring or get some softer mugen orings.
Some say put some grease around the outdrive shaft where it goes through teh diff case and gear.

[Jonathan Bell]

I don't have the truck yet but I would figure the o rings are the same size as the mugens. If that being the case protek makes some o rings that are a tick larger then the stock ones and they have been great for a few of my buddies that run mugens. Below is the link. Maybe mikey will see these and caster can make some a little bit larger so we can keep the the caster brand.!!!!!

http://www.amainhobbies.com/product_info.php/products_id/2670

[skeller]

I always use grease to pack in the o-ring and the outdrive shafts....even on top of the o-ring before I put the shim over it. The diff oil has a harder time leaking through the grease and the o-ring.

[hakmazter]

Prommy, There is an optional diff gasket that is available. Maybe that would help.

I would highly recommend NOT going to another brand of diff just because of a fluid leak, especially if you are a team driver. As you know, we have recommended OFNA shock bladders in the past and we have recommended Mugen captured hinge pins in the past when necessary. So basically, we are willing to send you in the right direction when necessary, but we also have your best interests at hand. That is all I am willing to say at this point. I do know that you need to check the shims on the diffs...especially the rear if you are just getting them. The next batch we order will be a version 3 and each time we place an order, there have been slight changes to make it even better... So next batch will have big bores and maybe some other slight changes like a different ackerman plate.....

Back to situation.
1.) Someone call Cam and ask him what to do...then reply here.
2.) Anything Razzor says is probably the right answer.
3.) I would imagine that SK knows a thing or 2 about diffs and it looks like he is trying to help...

[skeller]

The diffs themselves seem to be pretty good.......I shimmed my ring/pinion mesh....then checked after a few tanks and re-shimmed. It's a habit I formed working with OCM....and I think it is just good practice anyway. I haven't had a diff faliure(internal/external gears) in almost a year.....that means I will always prep my diffs this way.?&^

I also use longer screws in the diff cases.....I think a 12 or 13mm is what I use. I also loctite them as well. The longer screw lets you tighten it down better and more screw in the hole means it's harder for it to come loose.....more OCM tricks.:#$

[Mr Fusion]

FYI, we have the red synthetic grease, in syringes. If Cam doesn't have any on hand, I can fix that.

If that's all someone needs (doesn't need to order anything else) I can send one out for like $5 shipped I think.

I have the G-force diff fluids available too, btw... which were just used to win the worlds warmup race last weekend. ?&^

shameless plug <*&

but not that kind of plug :eek: :D

[hakmazter]

The diffs themselves seem to be pretty good.......I shimmed my ring/pinion mesh....then checked after a few tanks and re-shimmed. It's a habit I formed working with OCM....and I think it is just good practice anyway. I haven't had a diff faliure(internal/external gears) in almost a year.....that means I will always prep my diffs this way.?&^

I also use longer screws in the diff cases.....I think a 12 or 13mm is what I use. I also loctite them as well. The longer screw lets you tighten it down better and more screw in the hole means it's harder for it to come loose.....more OCM tricks.:#$


I didn't want to say it....but I remember the dominating thread. I will say that the great thing about product failure and problems is that there always seems to be a way to fix them and it seems like someone else has seen them in another application.

The greater thing about it is we send it to Mikey and it gets fixed or improved upon almost immediately. At the rate we are going, I figure that we will take over the market in 2012 just before the Mayan calendar ends......Maybe that is what they were predicting.....
:bsflag:

[hakmazter]

4.) Anything SK says is probably the right answer also.....

[hakmazter]

Speaking of which, were you more excited or pissed that you could take a new buggy that you never drove and do so well at an event? I didn't get to talk to Cam a lot, but he said that you were pretty happy about it. I will be anxious to hear about home track lap times and what happens if you switch settings (will it be better or worse?)

[razzor]

Diff leaks are rather common on lots of brands so not just a niggle to us Caster guys.
Its also one of those things that gets overlooked as a necessary maintenance item that needs to be checked regularly.

2 relevant links that worth a read.

http://www.rc411.com/pages/howto.php?howto=35&page=2
http://www.rc411.com/pages/howto.php?howto=24&page=3

[vnmsgt]

I always use grease to pack in the o-ring and the outdrive shafts....even on top of the o-ring before I put the shim over it. The diff oil has a harder time leaking through the grease and the o-ring.

I have not heard of that being done but I did think of it. I just did not do it thinking the new o-rings would be ok. Thanks for the info. Will definitley get done when I take them apart again, especially if they still leak.

[vnmsgt]

FYI, we have the red synthetic grease, in syringes. If Cam doesn't have any on hand, I can fix that.

If that's all someone needs (doesn't need to order anything else) I can send one out for like $5 shipped I think.

I have the G-force diff fluids available too, btw... which were just used to win the worlds warmup race last weekend. ?&^

shameless plug <*&

but not that kind of plug :eek: :D I would like to try some of that grease. The syringe idea sounds real cool. Send me a PM where to pay you. I forgot what it was.

BTW the Fusion G-Force shock fluids I got from you have been great so far! Will definitely get the G-Force diff fluids once I run out of what I got now.

[vnmsgt]

Back to situation.
1.) Someone call Cam and ask him what to do...then reply here.
2.) Anything Razzor says is probably the right answer.
3.) I would imagine that SK knows a thing or 2 about diffs and it looks like he is trying to help...

I would call him and reply here if someone would pick the phone up over there. Have not spoke to him since monday of last week! Many calls and some messages too!

[hakmazter]

Well, I have talked to him several times. Are you calling his cell phone #? I know he has been extremely busy at work lately.....

[skeller]

I've been using a syringe for my grease for about 3 yrs now....works great.



Are these diff oils your talking about sold through Caster?

[Mr Fusion]

Shane, the oils are a new product I came up with recently. At the time, Caster didn't offer any oils... so I started looking into getting my own. And I actually found it, lol.

It's not really on the market so to speak... but will be very soon. I have quite a few local guys running it, and a few "team" guys too. Dave Alberico, Cam, Mack Vanderbeek (AE ride), Jason Anderson, BigC, vnmsgt,... Taylor James, Steve Hale...

So far, so good... seems everyone is very happy with it.

I hope to make it "THE" after market oil for racers, kinda like MIP and Lunsford did for CVDs and turnbuckles. If you are interested, LMK.

BTW, any Caster team guys are welcome on the G-force team too.

http://casterracingusa.com/product.php?productid=381&cat=14&page=1

[skeller]

OK.......I'm interested:D

[skeller]

What do you need from me upfront (resume or the likes of) if anything?

[Mr Fusion]

send me a PM with your contact info... or call me 515-321-1744

Dustin

[Prommy]

I haven't gone away from Caster have stuck with it and keep refilling as would think something would come up to fix the problem.
Everything seems to be holding up at the moment.
Only a little leakage nothing major.
Car is going strong and pulling wheelies now whilst around corners and down straights.
So everything is coming together nicely.
Just need times to show it.
:)

[razzor]

just try and be smooth and tight on apex's and as you get comfortable pick up the pace a bit more.
Most of all have FUN !!! :)

[hakmazter]

I haven't gone away from Caster have stuck with it and keep refilling as would think something would come up to fix the problem.
:)


Like I said, do not switch over to another brand.....all I can say right now...<*&

[Jonathan Bell]

Dustin I'm interested also I sent u a pm. I think the racers have needed a "standard" oil for a while now! ;)

[skeller]

send me a PM with your contact info... or call me 515-321-1744

Dustin


Dustin....did you get my pm the other day?

[skeller]

Also....are your oils on a website somewhere that I can look at?

[hakmazter]

ummm, this one has them in chemicals or you can type in "fusion" in search.... Not a lot of info.....but there....