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Installing pinion gears with Loctite 680


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#1 chasbeeman

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Posted 05 February 2018 - 02:56 PM

I started using this a few years ago on lower powered motors as an alternative to soldering.

Care must be taken to avoid getting the 680 too near the motor bushing less it will seize and ruin the motor. I've made paper and plastic masks that worked ok.

Recently I was preparing to install a pinion and noticed a piece of lead wire insulation on the bench, I sliced the ends with a razor blade to make them square and slid the insulation onto the motor shaft.

Well it worked great and offered a better seal keeping the 680 away from the bushing. After a few minutes of drying time use a dental pick or straight pin to remove insulation from motor shaft and ready to race!e0522239668847a70bd78e4ac41ab307.jpgd1f5e2864577ad8040ba5cef2268a5df.jpg846cc86e061a50e4e1e2de1a3ca69842.jpgd20bcb5f8bfe0fce7da576dc634653aa.jpg

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#2 The Number of

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Posted 05 February 2018 - 03:33 PM

Good idea, I have been using the Loctite method for about 2 years now and haven't had a spun pinion since.
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#3 Eddie Fleming

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Posted 05 February 2018 - 03:35 PM

I have been using 680 for some time now just with care not to get in to the bushing. It works great, but your wire insulation idea is a lot safer. 

 

Thanks.


Eddie Fleming

#4 Mark Wampler

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Posted 05 February 2018 - 03:40 PM

How does it go when/if you pull the pinion afterwards?


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#5 DOCinCocoa

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Posted 05 February 2018 - 03:45 PM

I simply put some motor oil on the can bearing. This stops the glue from getting into the bearing.


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Doc Dougherty
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#6 The Number of

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Posted 05 February 2018 - 03:46 PM

How does it go when/if you pull the pinion afterwards?


Mark, What exactly do you mean? Question to me seems vague.
Bill Fulmer

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#7 Eddie Fleming

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Posted 05 February 2018 - 03:52 PM

How does it go when/if you pull the pinion afterwards?

Just use a gear puller and it works fine. Scrape off the shaft and put a different gear on if you want.


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Eddie Fleming

#8 Mark Wampler

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Posted 05 February 2018 - 03:53 PM

Okay, does a gear puller do the job....  get it?

Question answered.   Nice idea.

 

Next:  How "low powered" are the motors you can use this with?


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#9 The Number of

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Posted 05 February 2018 - 04:03 PM

Gear puller works fine, I use an emery board to clean the residue off the shaft and put another pinion on. The highest powered motor I have used it on is an older box 12 motor.


Bill Fulmer

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#10 Eddie Fleming

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Posted 05 February 2018 - 04:28 PM

I only run retro so that is all I know.

 

When you pull a gear off it feels like it would hold a lot of motor. Heat would be my concern.


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#11 Eddie Fleming

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Posted 05 February 2018 - 04:32 PM

When I start with a new motor I use a cut off wheel and put three small marks spaced around the shaft to give the 680 something to bite into.

 

I did the same thing when I was soldering pinions on.


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Eddie Fleming

#12 The Number of

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Posted 05 February 2018 - 04:33 PM


I have used a hot iron to soften the glue when I have a pinion too close to the bearing to get a puller under it. It softens about the same temp as I would use to solder a pinion onto the shaft.


Bill Fulmer

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#13 Mark Wampler

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Posted 05 February 2018 - 04:57 PM

What is a good curing time before motor can be raced?


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#14 The Number of

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Posted 05 February 2018 - 05:03 PM

3 to 5 minutes I found works for me.
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#15 munter

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Posted 05 February 2018 - 06:53 PM

I have ruined a couple of motors doing this but have had more success recently.

 

That collar of wire insultaion is a winner in my book of tricks. Thanks.


John Warren
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#16 DOCinCocoa

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Posted 05 February 2018 - 10:40 PM

This glue works very well on all motors, Group12, S16Ds, etc. Several years ago I asked what the drag racers use to keep their pinion gears on. I was told that they use this glue. Works for me. Never spun a pinion gear. But it all depends on a good method, just like soldering pinions on.


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#17 Booger

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Posted 05 February 2018 - 11:25 PM

Great idea!...Thanks!

 

I have been using 271 Loctite for 3 years  and have never spun a pinion.....I like it.

 

I mount bushings and ball bearings with it when possible also.

 

Loctite is about 1/2 total strenght in 1 hour,fully cured in 24 hours.

 

Acetone will speed the curing process of all Loctite products that cure with the absence of air....It's the cleaner of choice for prepping things for use with this type of Loctite.

 

Acetone will cut the cure time in about half.Read more about this and other tid-bits on the Henkel (Loctite) web site

 

I've been using Loctite products 40+ years in my real job.....Good stuff.

 

I've never tried running any cars with less than a 1 hour cure time or so.....But I'm going to try one now!...Thanks!


Gary "Booger" Baker

#18 Mark Wampler

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Posted 05 February 2018 - 11:25 PM

In as much as I reuse everything, when you remove the pinion, there is probably a build up of glue residue  inside.   I would imagine that would be a problem in trying to re-install it.   The previous post would make acetone a poor choice to remove the residue.  M E K   might work?  I have a 2mm reamer, but concerned about taking metal off the inside in trying to remove residue.


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#19 Half Fast

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Posted 05 February 2018 - 11:32 PM

The stuff is very expensive when bought from US sellers, the Chinese sellers on Ebay are much cheaper but I wonder if the stuff is counterfeit.
 
Any thoughts?
 
Cheers

Bill Botjer

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#20 Booger

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Posted 05 February 2018 - 11:45 PM

A 2mm reamer works perfect for cleaning the pinion for re-use....That's the size it is to start with (well,suppose to be)


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#21 Mark Wampler

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Posted 05 February 2018 - 11:50 PM

I'm thinking long as the metal is harder than the residue.  Brass pinion bores could get gouged. 


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#22 Booger

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Posted 05 February 2018 - 11:52 PM

It's not THAT expensive....$20 for a lifetime supply.

 

You can use the reamer with your fingers,you wont hurt anything unless you try real hard! It's just sort of a mostly powdery residue left behind after pulling the gear...

 

They ream the pinion bores when they make them......Just start it from the "wrong" end of the reamer,the drive end,that will help keep the pinion from tipping on you.


Gary "Booger" Baker

#23 Mark Wampler

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Posted 06 February 2018 - 02:33 AM

I'll be giving this a whirl sometime soon.  Thanks !


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#24 Eddie Fleming

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Posted 06 February 2018 - 07:05 AM

For cleaning out the used pinion I cross cut the end of a old armature shaft to give it a little tooth and use that as a reamer. It works well enough and was cheap.  


Eddie Fleming

#25 Robert BG

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Posted 06 February 2018 - 07:56 AM

Years ago guys used epoxy on opens to hold the pinions on,although I forget what it was I'm pretty sure it was 2 part stuff.Granted on those monsters guys also pinned them.But if you're worried about a puller being able to pull them off its not a issue.I've used my puller to pull soldered and pinned pinions off without a issue.If it can crack high strength silver solder and shear  a steel pin all at once I dont see locktite being a issue at all.


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