[help] Complete Assembly Of H8

[hkopium]

I am about to take my whole H8 apart and re-assembling it for installing the CAW metal chassis and other hop-ups.

I have the manuel, but as you may all know, the manuel is rather not that helpful. It consists of certain assembly of small components and a major big dissected diagram of H8. No step-by-step instruction.

Now, I need advise from you experts...

(1) Where should I start my dissembling? Take out the front differential section first > then the rear differential section > then the center section?

or I should take out the center section first?

(2) Anything I should be extra careful with?

(3) Re-assembling is simple the opposite of (1)?

Thanks!

[pimpsmurf]

twist the front torque bar off of the front top plate. Then take the 3 screws out that lets you take the wing off (remove the 4th screw holding the rear body mount to get it completely off) Then take all the screws out of the bottom of the chassis.

That should break everything down into 3 piles. Keep your front diff/arms/etc in one pile. Keep your rear diff/arms/etc in another pile. Then keep your chassis, center diff, top plates, servo, etc in another pile.

Keep your front diff screws with your front diff and so on.

Trying to figure out which screws are 2.6mmx8 vs 2.6mmx6 is a lot easier if you only have 20 to look at instead of 60.

-JNY

[hkopium]

Thanks bro!

But what is the front torque bar? Is that same as the bumper? Why twisting? It has a screw on it. Can you inform me the part # of front torque bar?

The rest I can understand. Thanks!

[pimpsmurf]

the front torque rod connects to the front top plate (right behind the front tower), and goes down to the front of the center diff. It is a rod with 2 ball cups.

-JNY

[hkopium]

the front torque rod connects to the front top plate (right behind the front tower), and goes down to the front of the center diff. It is a rod with 2 ball cups.

-JNY

Okay I see. Silly me.

But, since I am taking the whole H8 apart, would it be easier to remove it after I unscrew the all screws at the bottom? So I can remove the whole "3 piles" from the chassis and pull the front torque rod out easily. Or I must do the twisting first?

[janniz]

taking the whole H8 apart
I did that once because I wanted to clean it. Its a lot of parts:
http://www.janniz.de/micro/h8_teile300.jpg
And at that time, I did not even have a manual ...

My advice: don't disassemble the whole thing at once, do it step by step as pimpsmurf said. Putting everything together again will be a lot easier then.

[hkopium]

I did that once because I wanted to clean it. Its a lot of parts:
http://www.janniz.de/micro/h8_teile300.jpg
And at that time, I did not even have a manual ...

My advice: don't disassemble the whole thing at once, do it step by step as pimpsmurf said. Putting everything together again will be a lot easier then.

Thanks bro,

Do you recommend I start the disassembly in this order Front > Rear > Middle? Or it doesn't matter. In what order did you do yours last time?

Thanks.

[bermbuster]

Hey a few parts are missing from the pic........
did you lose them???? :p

[BitHed]

...i remember the first time i saw the Exploded View...It was scary...And now I can almost do it in my sleep...lol...But I ALWAYS have one screw left over :o

[rustler08]

that's spooky.

TIP from me: Take a picture of your car assembled. It helps.

[leapingbug]

...i remember the first time i saw the Exploded View...It was scary...And now I can almost do it in my sleep...lol...But I ALWAYS have one screw left over :o

No thats a great tip takeapert your car put it back together 2wic.
Youll save alot on weight and have extra hardware. ;) It works for me every time :p

[hkopium]

You guys are scaring me... I am still staring at my H8 and feeling so uncertain to take it apart. I am afraid I will never make it running again after the "surgery" LOL

[BitHed]

...Opium GO ON...you know you want to ;) And you know what? I bet you out it back together and it runs BETTER ;) welcome to the REAL world of RC...lol...5 minutes driving for 5 days wrenching..lol....

[hkopium]

...Opium GO ON...you know you want to ;) And you know what? I bet you out it back together and it runs BETTER ;) welcome to the REAL world of RC...lol...5 minutes driving for 5 days wrenching..lol....

Oh yeah, I definitely want to, but no no, it might never be running again. :D

That's very true, 5 min. driving for 5 days wrenching :eek: That's what make RC so fun.

[BitHed]

...its friday night Opium...Stay home from the dance clubs and polish your wrenches :D I want a full report of your super-tuned H8 on my desk by 9am Monday morning :D

[hkopium]

...its friday night Opium...Stay home from the dance clubs and polish your wrenches :D I want a full report of your super-tuned H8 on my desk by 9am Monday morning :D

MISSON ACCOMPLISHED. SIR! :D

But now... trouble...

(1) Installed 3Racing ball bearing steering unit. Total screw up! The steering unit failed to function. I tightened the steering spring all the way and apparently, the 3Racing steering is too slippery at that Triangular joint. I will re-do the steering with Original parts later.

(2) I installed ATM front, rear and central ball bearing differentials. The car is so slow at acceleration. Once it started, it runs fast. Still... it sucks.

(3) Also related to ATM diff. For some reason, the front wheels loses power. When off the ground, everything seems fine except:

When running backward, the front wheels simply will not move on their own. Even when the car is held in mid-air. Rear wheels spin like crazy, but front wheels have no motion. :eek:

Any ideas how to fix (3)? Or it is simply normal after installed ball bearing central diff?

[bermbuster]

sounds like your front diff is loose....you need to tighten it up. that will be your main adjustments now......using the ball diffs require constant attention and periodic adjustments......

[hkopium]

Thanks. I will check the front diff. tomorrow. Really exhausted from modifying my H8 today. But I think you are correct. I checked by manually turning the wheels. The front diff. does turn much easier than the rear wheels.

How to tighten this ATM ball diff? Tighten the screw in the middle of the diff. disc?

Anyways, here is my H8 with the CAW chassis. I also changed all shaft cups to metal ones. Added a few more alloy stuffs like the rear wing mount and joint, titanium center dog bones... etc.

Will change the steering rods to Titanium tomorrow as well. Bought the GPM alloy diff. cases for both front and rear. Really disappointed since the package doesn't come with sufficient screws!!! So I left them in original plastic one. :mad:

http://i29.photobucket.com/albums/c254/hkopium/DSC00025.jpg

[bermbuster]

really nice job on the H8.
I never had the atomic brand of ball diffs but they will adjust via the center screw. You need to know (feel) when they are fully locked then back the screw off to a suitable tension. Trial and error will give you what is best for your set up. Better to be too loose and work your way up to the proper tension. All grip and no slip = broken components. It will be one fast H8 while it lasts........

[BitHed]

...I always ran the ATOMIC diffs quite tight...They seemed to run much better...I agree though trial and error and maintenance; until you learn the feel of it for your running conditions ;)

[hkopium]

...I always ran the ATOMIC diffs quite tight...They seemed to run much better...I agree though trial and error and maintenance; until you learn the feel of it for your running conditions ;)


Bithed bro,
(1) You using ATM for Front, Rear and Center as well?
(2) How to adjust the tightness?
(3) How tight are you running them with? All the way dead tight?
(4) Is it normal that the rear wheels run like crazy but fornt wheels are just moderate? When the car is held in mid-air.
(5) Front and Rear are very quiet. But is your center diff. unit quite "Noisy"?

[BitHed]

...i used the front and rear for a long time, done up very tight by doing up the screw / nut / bolt in them...not rock solid but they were very tight...I tried the center and didnt like it...The center went from america to me and now on to Singapore..lol..it gets around...

...Your front not responding sounds like a diff issue...Maybe a stripped diff cup...if the motor is going then follow the line to try and see what ISNT turning like it should be...is your front diff in the right way? The big wheel is fitting in to the dimple in the chassis? Check you diff cups, where the dogbones join the diff...The problem might be in there...

[hkopium]

Thanks for the reply. Bithed.

I didn't tightened any of the diffs., just installed as they were out of the package. Didn't know how to tighten them LOL. But as far as I remember, the rear ATM diff does seem tighter than the front one.

I checked, the alloy cups I installed are dead tight and fit well. (I added some blue color screw glue for safety purpose) So they should be okay.

(1) Okay, the ATM front/rear diff. unit comes in 2 pieces. The bigger one has a screw sitting in the center. So simply tighten that screw will do, Correct?

(2) What do you don't like about the center diff.? Noisy? Too slippery?

(3) When the car is held in mid-air, when I press forward trigger on Tx, the rear wheels are running forward, but the front wheels run backward, is that normal?

(4) This is an elementary Half-8 question: What are the functions of (a) center diff. and (b) the adjacent Gear (2 gears) unit does? The one connect to the motor gear and center diff. I placed an ATM anti-slippery pad inbetween the two gears. They both seem to prevent damage to the car... But why need both units? Isn't the 2-gear unit (not the diff) can fulfill the purpose?

[hkopium]

Thanks to those who helped.

Front and rear differential problem solved. Tightened them almost all the way and now the car can run properly.

However, the ATM center differential really sucks. NOISY as HELL and NOT SMOOTH. Really hope to see 3Racing release their center diff. But when!? :confused:

The steering problem solved. I inspect the steering unit closely and suddenly see that the steering rod is broken :o Now my car can steer properly but the angle is small... strange... :confused: