Cougar SV diff troubles!

[bumrar]

well, didn't have the best of starts with my cougar this weekend - only managing to finish two heats at Bury metro due to the diff unwinding itself and the circlip coming out of its groove. When it did go tho, it was superb! waaay waaay better than my tired xxx!. Another guy pitting near me was having the same problems with his. Is this a common issue? quality issue with the parts maybe? or just the numpty assembling it?

Regards,

Ste

[slow bob]

I think the team drivers have done a fix for the diff problem in one of the cougar setup threads

must be a common problem

[Mossy]

You have to be carefull when putting the Circlip in.

Before you put the circlip into the diff outdrive, make the circlip wider i.e spread the actual width of the shortest point. When you put it into the diff halve, it needs to be a very tight fit - you shouldnt be able to even rotate it with a small screw driver. When it is this tight you wont have anymore problems.

Si

[bigred5765]

in the new instruction manual that was with your kit there a page floating around the front page, explains it all in detail if built right you should have no issues, if your having probs at southport next time come see me ill take a look for you

[DCM]

so the groove has been machined to deep?

[Cockerill]

I think it's more a tolerance issue as there only seems to be a few people experiencing the issue.

You should have come over and seen one of the Schumacher guys, any of us would have had a look over it for you

[bigred5765]

Originally Posted by DCM

so the groove has been machined to deep?

not really the one i saw yesterday they had squashed the cir-clip to much when installing it, so it was sloppy,buy slightly stretching it before you install it your counteracting this,

[bumrar]

Originally Posted by bigred5765

in the new instruction manual that was with your kit there a page floating around the front page, explains it all in detail if built right you should have no issues, if your having probs at southport next time come see me ill take a look for you

ah yes- that bit of paper I discrded! oops! I did try opening the circlip up before installation, but then wasn't taking much care not to squeeze it more than needed, this, and putting it in and taking it out several times could be the problem. Got some new parts on the way, so I'll take more care when assembling it next time.

Thanks for the help guys

Ste

[bigred5765]

ste was u the guy that came to see me at bury, u lent my c lip pliers

[mikeyscott]

Just wondering what diff balls come with the SV?

[JohnM]

round ones

[Michiel H.]

Ceramic ones, trust aswell.

Stupid circlip tough, can't get mine right.

[Albertini]

Originally Posted by Michiel H.

Stupid circlip tough, can't get mine right.

Having trouble here too, a bit too fiddly. Got it in and it dosen't rotate or move easily but it did a little when I applied a little pressure with a small screw driver.
Only got one clip so its going in. Not a great bit of design this bit otherwise all good.

[bigred5765]

its not a worry and is exactly the same as the cat sx, as long as you build it right it give many hours of trouble free racing, and is a simple neat idea that works just fine,

[simoncrabb]

Originally Posted by mikeyscott

Just wondering what diff balls come with the SV?

Err, from the manual:

Ceramic Nitride Diff Balls 2.5mm (pk12) U3019

[fastinfastout]

Originally Posted by simoncrabb

Err, from the manual:

Ceramic Nitride Diff Balls 2.5mm (pk12) U3019

can you use 3/32 (2.38mm) diff balls?

2.5mm is an odd diff ball size

[MattW]

I very much doubt you can use 3/32. I have checked in this diff, but did once look into it for the touring car diffs and it wasn't possible then - and there doesn't feel like there is enough side movement to allow for a smaller ball.

2.5mm isn't hugely odd - and it's a Schumacher part. As well as some other aftermarket diff ball sellers that i've seen.

[j0pp3]

I found a very cheep circlip plier (approx $3) and opened it up slowly so that the space was 4.5mm as stated in the attached paper.

Then carefully fitted it in one side at a time. The hardest part was in the beginning and the clip flew away a few times Then I took a transparent plastic bag and wrapped it over the diff and my hand so it couldn't go very far

Take your time. This is an important step while building.

Happy racing!

/j0pp3 (RC-newbie)

[ant west 71]

no problems here either, as ive not got the pliers for these, so i started the one end of the clip and just rotated it around working it down into the groove with a strong needle in the leading hole. never had a problem yet and that is after 4 meetings.