I AM FUMING MAD, I CAN'T BELIEVE THIS AT ALL!!
I am in the middle of checking over my HotShot shelf queen and find this. It p()(*& me offf bigtime. To think that these arms(all four now) are cracking from some reason. I seem to think it is the fact that I used the Moly grease from back in those days. I am warning you ALL, if you are building a shelf queen, DON'T LUBE THE PINS AT ALL. I am now having to source new front and rear arms and they ain't cheap. I hope somebody learns from my mistake.
here is the left side, cracking is on the bottom.
again, now right side, same arm cracking through
Comments
SubaruBrattJunkie
Ohoh, I have 3, but don't think I lubed them after I restored them, still thanks for the heads up!
technical.burP
Thanks for the valuable information. This proves my thesis again, that one should only grease the gears.
The reason of this problem is to be found in the matter of old plastics. The are held by polymers wich disapear out the plastics after some years. Now the plastic is poor so oil,grease or other lubrication separate the moleculs from each other.
Even paintremover is very harmfull!
The best way to lubricate (old)plastic part is with candlewax!!
Neil_S2000
Ooops I used molybdenum on all the recommended pieces when I rebuilt my Boomerang recently
Is it the red bits that are cracking or the actual suspension wishbones?
Tamichael
My theory is that the thread of the metal bolt is too big for the hole.For a shelf queen you should only stick the bolt in, not screw in. The combination of tension and disappearing polymers kills the nice arms of your HS 1.
Crash Cramer
It is the BLACK plastic that has cracked, kind of hard to see in the pics. I have cleaned the MOLY off all the parts and recommend anyone doing a shelf queen to stay away from ANY black grease at least, but most likely ALL grease. I am waiting on the red plastic to go next. So word to the wise.
flux density
My front shock ends broke sitting on the shelf.. my guess... Tamiya used biodegradable plastic
Crash Cramer
Yessir, you know Tamiya...Ahead of their time...Recyclable and Earth Friendly RC cars....
kontemax
Hi Crash, you can avoit this problem caused buy the tread of the screws (I don't believe in the grease theory) making a bigger hole where the screws are bolted on. The original hole is 3mm. I drilled the side where there's the tread 3.5mm. The screw tread enter easly (and probably exit with use) but it's a shelf queen, not a runner. With this method I saved all the arms in my all HS serie. I remember the problem when in the far 1987 I cracked the Boomerang arms. It's a mechanical problem, not chemical IMHO. Cheers Max
Crash Cramer
Well now, that is a logical theory. I do hope I don't have to ruin my Fox arms to find out about the same problem. I better do some drilling soon or it will be all over for the Fox, or I could just unscrew the hinge pins and find some metal shafts in their place. I am guessing the cheapest way would be to file the Screw pins threads OFF and keep a mint set of those around versus drilling out the plastic arms that are next to impossible to get cheaply, even after the RE RE I suspect.
roadstar79
I sprayed a tiny bit of WD-40 on my creaky suspension joints and guees what? The plastic broke down within a couple days. I also found out that lock tight can do the same thing to the older plastics.
Crash Cramer
Well thanks for some more DON'TS for the old plastic. If you haven't found out yet, the NEW RE RE HotShot arms are made of a better plastic, but time will tell if they too crack in the same places.
Wyoming
huh, so thats why my Super Sabre fell apart...good to know Chris
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