DOOBEEWHA
HPISF languist expert
- Messages
- 1,332
- Location
- Petaluma,Ca,
--------------------------GEARS TOO TIGHT!!.... SAY IT ISN'T SO!!------------------------------------------
================================TRY THIS OUT!========================================
Works for CB/Spur gear combo's that are:
49/19 - 49/20 - 52/18 - 52/19
(Not sure about 52/20) but very likely.
Take your engine out out of the truck.
Find a flat and true surface like a table saw or marble counter top, thick glass table, ect. Prefferablly a surface
that won't warp from pressure.
Now.. Take a sheet of 250 grit sand paper and tape it down to the surface your working on, with the tape on
all four sides.
What were going to to do here is, remove some matterial off the bottom of the engine mount
By doing this, you can effectively create more adjustment room for the engine to seat with the CB and spur
gear. When sanding, you only want to take off very thin layers away at a time.
I would take a sharpie and ink out the base of the engine mount surface and use it as a guide to how much
matterial is being removed.
Be sure to apply EVEN pressure as you sand.
(Supplement) Quote -Komodo67:
We remove material all the time at the machine shop in this fashion...the best way to assure even removal of
material, is to sand in small figure-eights...and, as mentioned, use something very hard and very flat underneath
the sandpaper...End Quote
------------YOU DON'T WANT TO MAKE THE ENGINE MOUNT OUT OF SQUARE OR WOBBLEY.--------------------
Each time you have remove the ink, re-install the engine and bolt up to see your progress. Still tight? Re-ink and
repeat. Check again.
I don't think it will take very much material sanding if the engine is able to already mesh up tightly. Just get your
gears to relax abit.
After doing this a couple of times, you'll have a better sense of how much matterial needs to be removed.
If needed, re-ink the base and repeat.
If you feel its a long ways to get the surface down, use your best judgement on the next amount of matterial to
take off.
---------------------------------------- AND KEEP IT SQUARE. ---------------------------------------------
After your done, Be preppared to re-adjust the throttle linkage a little shorter to compensate for your new engine
mount height.
This Mod does not take into account, the posibillity of incompatible Gear meshes.
Propper meshabillity of CB and Spur, falls on the installer of said CB/Spur Gear Combinations.
You may find it nessessary to bevel the TVP where the header rests on the chassis when going for the biggest gear
combos.
Mod or not,....
I think its a good idea to do this bevel cut anyway because it stops the groove indentation on the headder.
A dremel sanding drum works great for this.
This mod simply creates the clearance for the application.
This mod should not have an effect on the usabillity of the other HPI CB/spur combo's
On that note... This mod will lower your CG a tad.
================================And that ain't bad.======================================
================================TRY THIS OUT!========================================
Works for CB/Spur gear combo's that are:
49/19 - 49/20 - 52/18 - 52/19
(Not sure about 52/20) but very likely.
Take your engine out out of the truck.
Find a flat and true surface like a table saw or marble counter top, thick glass table, ect. Prefferablly a surface
that won't warp from pressure.
Now.. Take a sheet of 250 grit sand paper and tape it down to the surface your working on, with the tape on
all four sides.
What were going to to do here is, remove some matterial off the bottom of the engine mount
By doing this, you can effectively create more adjustment room for the engine to seat with the CB and spur
gear. When sanding, you only want to take off very thin layers away at a time.
I would take a sharpie and ink out the base of the engine mount surface and use it as a guide to how much
matterial is being removed.
Be sure to apply EVEN pressure as you sand.
(Supplement) Quote -Komodo67:
We remove material all the time at the machine shop in this fashion...the best way to assure even removal of
material, is to sand in small figure-eights...and, as mentioned, use something very hard and very flat underneath
the sandpaper...End Quote
------------YOU DON'T WANT TO MAKE THE ENGINE MOUNT OUT OF SQUARE OR WOBBLEY.--------------------
Each time you have remove the ink, re-install the engine and bolt up to see your progress. Still tight? Re-ink and
repeat. Check again.
I don't think it will take very much material sanding if the engine is able to already mesh up tightly. Just get your
gears to relax abit.
After doing this a couple of times, you'll have a better sense of how much matterial needs to be removed.
If needed, re-ink the base and repeat.
If you feel its a long ways to get the surface down, use your best judgement on the next amount of matterial to
take off.
---------------------------------------- AND KEEP IT SQUARE. ---------------------------------------------
After your done, Be preppared to re-adjust the throttle linkage a little shorter to compensate for your new engine
mount height.
This Mod does not take into account, the posibillity of incompatible Gear meshes.
Propper meshabillity of CB and Spur, falls on the installer of said CB/Spur Gear Combinations.
You may find it nessessary to bevel the TVP where the header rests on the chassis when going for the biggest gear
combos.
Mod or not,....
I think its a good idea to do this bevel cut anyway because it stops the groove indentation on the headder.
A dremel sanding drum works great for this.
This mod simply creates the clearance for the application.
This mod should not have an effect on the usabillity of the other HPI CB/spur combo's
On that note... This mod will lower your CG a tad.
================================And that ain't bad.======================================
Last edited by a moderator:
