RE: Blew up my rear end !

RE: Blew up my rear end !
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RE: Blew up my rear end ! - 9/5/2007 1:57:39 AM

cyclops1970

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From: Hamilton Ontario , CANADA
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quote:

ORIGINAL: carpy100

its not a 'blown' diff. it'll be a loose drive square,layshaft gear,pinion or spur.outside chance its the clutch but i doubt it.

agreed a stupid grub screw .

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Post #: 26

RE: Blew up my rear end ! - 9/5/2007 9:50:51 AM

Bratch96

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From: Stonington, IL, USA
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quote:

ORIGINAL: cyclops1970

quote:

ORIGINAL: carpy100

its not a 'blown' diff. it'll be a loose drive square,layshaft gear,pinion or spur.outside chance its the clutch but i doubt it.

agreed a stupid grub screw .

That's what it looks like from the video. But if the man says it's a blown diff, than it's a blown diff.

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RE: Blew up my rear end ! - 9/7/2007 6:49:46 PM

Dave ESPI

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From: Latham, NY, USA
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Well, I have checked everything short of completely removing the dif from the chassis.

The drive gears and the shaft locking nuts are all tight, no missing set screws, the clutch works just fine in the motor itself. The dif just seems "loose" and the posi-traction action where if you spin the right wheel forward, the left one just sort of free spins, and doesn't have any "grab". WHen I start the engine, it runs, it revs, it spins the pinion, drive gear, layshaft and dif drive ring at full speed, but there is just no power transfer to the wheels.
For comparison, anyone who runs smaller scale electrics as if you had the dif lock set too loose on a RC-10 and the spur gear spins around, and the one wheel doesn't while manualy turnign it, as they will rotate in oposite directions, but not forward with any sort of speed.

Is there a set screw inside the ball drive cups shaft insert somewhere that I'm just not seeing that will tighten up the dif ? I'm looking at the exploded view parts diagram and just don't see anything as it is not a planetary drive system with rings and internal balls like what is on an RC-10 Stealth trany.....

or should I just replace the entire dif with an ELCON

SKU: F18500
COMES PRE ASSEMBLED

Price: $ 253.00 / Each

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RE: Blew up my rear end ! - 9/7/2007 7:00:18 PM

kengentry5000

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There are no screws inside the diff. There is a spline pattern on the outdrives that mates to a spline pattern in two of the bevel gears.

I'm too lazy to go back through all the posts (I have read most of them over the last few days, though)...

Has anyone suggested to check for a loose wheel block or a rounded out "square" hole on the wheel itself? Also, I had issues for a while with the shallow M4 screws that hold the diff ring gear to the outside of the diff housing.

If you have already checked this then why not crack open the diff and inspect the bevel gears. Diffs can get expensive and if your bevel gears are in good shape then you can immediately eliminate the diff.

As for that Elcon diff...SWEET it is. You will have to use ball drive axles instead of dog bones, though so plan on about $300 out of pocket.

< Message edited by kengentry5000 -- 9/7/2007 7:05:31 PM >

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RE: Blew up my rear end ! - 9/8/2007 3:46:04 AM

TheFgMan01

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what if the allen in your wheel squares were just loose the whole time, that would suck so bad. not that im jinxing your or anything

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RE: Blew up my rear end ! - 9/8/2007 3:58:35 AM

Dave ESPI

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Thanks for replies thus far.
I checked the wheel blocks, but it is not as simple as that saddly (I wish it was!).
The balldrives were upgraded when I bought the truck, and I have replaced one inner drive cup (already in another thread of mine entitled EPIC MAYHEM) when It broke off a jump landing under power, so if I did upgrade to the new dif, it would be saving me money in a way...

If I go the distance and strip the truck down to the point of removing the dif, I'm just going to replace it and forget about it. While in there, I'll upgrade the rear suspention shock towers because the plastic one keeps pulling off the dif block screws.

I think first though I'm going to buy that ford f-50 onroad then worry about fixing the truck.

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Post #: 31

RE: Blew up my rear end ! - 9/8/2007 4:41:35 AM

Bratch96

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So the diff gear turns but the axles do not.....was that the stock diff? I think you should buy that onroad car, I would be interested in hearing about it.

p.s. I now have a signature line, just for you Dave ESPI......

< Message edited by Bratch96 -- 9/8/2007 4:44:18 AM >

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Post #: 32

RE: Blew up my rear end ! - 9/8/2007 6:28:00 AM

Dave ESPI

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Thats just it... "everything works like normal", but it is way too loose as if the dif was not tightened down with a locking ring or something..... All the gears on the outside are rock solid, and the axles are just as they are supposed to be.

This is the Stock dif. I have about 40 hours of run time on it or so.

Maybe I'll film a video to show it exactly as it makes no sense to me at all with what it is doing.

Yeah I'm def getting the car. I need another "BIG UN" to rip around with in the parking lots near my house, and my truck is just too damn loud for my pissy pant neighbors.... LOL.

I'm going to get a Honda weedwacker silencer for it if the pipe and rubber tube doesn't work out.

EDIT: haha thanks for the sig "hat tip"

< Message edited by Dave ESPI -- 9/8/2007 6:32:54 AM >

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RE: Blew up my rear end ! - 9/8/2007 8:20:09 AM

Dave ESPI

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3:11 am... Mystery may be solved.

Thanks to help from Bratch, we went through the rear end and much to my amazement and having overlooked it, one of the drive squares was "off" the flats on the shafts. While it was tight enough to not be noticeable when hand cranking it or trying to turn and check for loose drive splines or anything else, everytime I was reving with the throttle, I had the rear end up in the air, so it was out of the equasion per'se... The tire rim was a tad melted , but not the square, and the only thign I can figure is it re-solidified once cooled down, and hence why it was tight to the shaft and made it difficult to diagnose this issue.

not sure if it is the entire puzzle solved, but tomorrow I'll fire it up and check to see.

Such a stupid thing, and I checked for that THREE TIMES !

Fingers crossed that there isn't another underlying issue with the soft dif and lack of locomotion.

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Post #: 34

RE: Blew up my rear end ! - 9/8/2007 10:25:55 AM

Bratch96

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From: Stonington, IL, USA
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Don't say I went through your rear end. That sounds gay.

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RE: Blew up my rear end ! - 9/8/2007 10:26:20 AM

TheFgMan01

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Hey i was right

sometimes it's so simple!! I know your still going to throw in a alloy diff arent ya ?

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RE: Blew up my rear end ! - 9/8/2007 10:54:16 AM

Dave ESPI

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From: Latham, NY, USA
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quote:

ORIGINAL: TheFgMan01

Hey i was right sometimes it's so simple!! I know your still going to throw in a alloy diff arent ya ?

f-yeah ! and the rear aloy brace. The dif may still have some issues, I'll know more in a few hours when I go run the truck again and my neighbors don't freek cause it is 6 am here... LOL...

GAH ! I need sleep.

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Post #: 37

RE: Blew up my rear end ! - 9/8/2007 1:47:10 PM

cyclops1970

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From: Hamilton Ontario , CANADA
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loctite all your grub screws ..

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RE: Blew up my rear end ! - 9/8/2007 6:24:45 PM

Dave ESPI

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From: Latham, NY, USA
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Cyclops they already were done, but sound advice for sure!
I now firmly believe that when it did come to the issue, the rim did indeed melt a little bit since there was some plastic around the threaded spindle, and the rim was hard to get off ( had to use a flat tip screwdriver as a wiggle/ pry bar and that is why I couldn't fully reprodude the same "loose rear end" with drive train parts acting normaly once it cooled at home from running and gave me a false sense of secure drive square, and because of how tight the sqyare was, it didn't move by hand. Once I fired it up and heald onto the tire good and hard, it broke loose from the plastic that had fused to the shanft, and now I can see the offset on the square as it had not looked that way before.

Pesky lill buggers these repair garage glitches can be, but knowing is 1/2 the battle !

The dif still runs like crap. I think after 40+ hours it is getting ready to be retired (replaced).

EDIT: Thanks all for the help

I took it out and fired it up. it is still sloppy, but atleast it goes again now.
I feel retarded because it is such a rookie mistake and I overlooked it because of the circumstances with the wheel fuzing onto the shaft then comming free and refusing again once I get it back to the shop to work on it.

* A Stupid grub screw on the axle block it is indeed.

now I just need to edit teh thread title... to "F#&@&@^!&@ ! grub screw and Murphy's law !"

The head gasket is def an issue still....

< Message edited by Dave ESPI -- 9/8/2007 7:34:38 PM >

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HIROBO SRB QUARK = Heli of the year. Seriously; if you hate always fixing your helicopters, you will LOVE this one !

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Post #: 39

RE: Blew up my rear end ! - 9/9/2007 2:37:46 AM