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Old 11-20-2005, 09:09 PM   #13426
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Hello fellow racer,I need your help My diff at the back keep loosen,I put a lock nut,glue still keep loosen,what I need to do,help me
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Old 11-20-2005, 09:19 PM   #13427
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Quote:
Originally Posted by jimlazaro
Hello fellow racer,I need your help My diff at the back keep loosen,I put a lock nut,glue still keep loosen,what I need to do,help me
There may be few causes for this to happen:

1. The lock nut does not lock properly - change a new one and c if it helps
2. The ball bearings and the spacers at the lock diff screw may not be assembled properly. - check again - it will be good if you replace them with the tamiya diff trust bearing. The balls are sealed and wont come lose like the Pro4's.
3. The diff is not tightened properly . - make sure the diff is tight but not too tight causing the diff to jam up.

4. The diff screw has oil or grease on it. - If the diff screw has oil, the lock nut will not lock properly.

Try these and c if they help.
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Old 11-21-2005, 08:53 AM   #13428
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I found the hpi diff bolts and screws to always be inconsistant. They seem to loosen or snap quite often especially when under stress. The tc4 T NUT set is a great replacement, it comes with a new nut that doesnt seem to loosen, and a screw that doesnt snap, and its a direct replacement its worth looking into if you get fed up of the hpi diff bolts.
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Old 11-21-2005, 08:56 AM   #13429
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Quote:
Originally Posted by Revs
I found the hpi diff bolts and screws to always be inconsistant. They seem to loosen or snap quite often especially when under stress. The tc4 T NUT set is a great replacement, it comes with a new nut that doesnt seem to loosen, and a screw that doesnt snap, and its a direct replacement its worth looking into if you get fed up of the hpi diff bolts.
Do you have a part number or link to that part for the TC4? Good info!

Thanks!
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Old 11-21-2005, 09:00 AM   #13430
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Quote:
Originally Posted by Revs
I found the hpi diff bolts and screws to always be inconsistant. They seem to loosen or snap quite often especially when under stress. The tc4 T NUT set is a great replacement, it comes with a new nut that doesnt seem to loosen, and a screw that doesnt snap, and its a direct replacement its worth looking into if you get fed up of the hpi diff bolts.
i agree with what you say last time i use to used the original diff screw i had been broke 3 screw and few nut even i putting locktide also would not effect after i had change to TC3 diff screw set i solve all the problem that i had before
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Old 11-21-2005, 09:03 AM   #13431
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I am runnnig a Pro 4 now. It is a great car. I had a FT TC4. That was OK but it lacked corner speed.

In my main yesterday the car was running great. I was fighting for second. It was a great bumber to bumper race with the other fellow. But anyway my car seemed to act funny. It did not have the rip like before. I thought it was the battery or motor. When I got home last night I found the cars front whhels would spin one at a time. I have a diff in. So this is not right. I will take it apart tonight. This latest post about diff bolts makes me think I may have a broken bolt.

I did snap a TC4 diff screw before. So those can break also.
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Old 11-21-2005, 09:44 AM   #13432
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Hi Rev we need info that you talking about or part# too,Thanks
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Old 11-21-2005, 01:04 PM   #13433
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Quote:
Originally Posted by Edwin Lee
There may be few causes for this to happen:

1. The lock nut does not lock properly - change a new one and c if it helps
2. The ball bearings and the spacers at the lock diff screw may not be assembled properly. - check again - it will be good if you replace them with the tamiya diff trust bearing. The balls are sealed and wont come lose like the Pro4's.
3. The diff is not tightened properly . - make sure the diff is tight but not too tight causing the diff to jam up.

4. The diff screw has oil or grease on it. - If the diff screw has oil, the lock nut will not lock properly.

Try these and c if they help.
one problem i had with my pro4 was the diff backed up especially on carpet what causes that is the thrust bearing is catching inside the outdrive beacuase it wasnt greased enough that was one problem the other was that the diff plates(rings) backed off so i had to CA them on the outdrives after all that finally it stoped backing off so you try those 2 things just remember cake on that grease on the thrust bearing i hope it helps.
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Old 11-21-2005, 01:09 PM   #13434
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oh yeah another thing is get rid of those HPI nut and screw and replace them with the associated thrust bearing nut and screw its a proven fix HPI did improve this witht the HARA EDITION you can get that to
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Old 11-21-2005, 01:18 PM   #13435
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Quote:
Originally Posted by ngo8
oh yeah another thing is get rid of those HPI nut and screw and replace them with the associated thrust bearing nut and screw its a proven fix HPI did improve this witht the HARA EDITION you can get that to
Would it be these then:

http://www.speedtechrc.com/store/ebp...id=189&id=1399

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Old 11-21-2005, 01:29 PM   #13436
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Quote:
Originally Posted by PD2
this is what you need
Attached Thumbnails
Hpi Pro 4-73522_01m.jpg  
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Old 11-21-2005, 01:38 PM   #13437
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Quote:
Originally Posted by ngo8
this is what you need
Gotcha - so that is different than the Pro 4 nut and screw, right? Is it a different part number and all? Or do you have a part number on it?

Thanks!
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Old 11-21-2005, 02:03 PM   #13438
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I think this is it, right?

http://www.hpiracing.com/piw4.php?part=73522

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Old 11-21-2005, 02:05 PM   #13439
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DIFFERENTIAL SCREW AND HEAVY-DUTY NUT (2mm) SET 73522
DIFFERENTIAL SCREW M2x25mm (2pcs)A162 this are the part numbers
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Old 11-21-2005, 03:27 PM   #13440
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has anyone tried any other spur gear brand other than the stock one that comes with the car? I picked up a 100th 64p spur from Kimbrough and found that only 2 of 4 screws lines up!

also I just recieved my bmi chassis and tried it out this weekend, I seem to have a problem with the cars ass end wanting to swap with the front when I let off on the throttle going into a turn (BOTH LEFT AND RIGHT). also when I try getting back on the throttle the car pushes like a pig. I have checked all my shocks for equal length, I checked for binding in the wheels, I checked both front and rear diffs, I checked for tweak. I don't know why it's doing this? Has anyone else had this issue? I am still trying to chase that sweet setup so I know eventually I'll get it.
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