Cleaning Model Glow Engines - Use of Antifreeze

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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Roger » Thu Sep 05, 2013 8:37 am

This is one stubborn bearing. Used the heat method, by using the heat gun on the outside casing, and she did not budge. Suggestion from LHS was to soak engine in some methanol to soften up the varnish. Engine been soaking now overnight and will give it another go.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by SteveJay » Thu Sep 05, 2013 5:25 pm

On some of the 2 strokes (Glow) I managed to drift the bearing out from the front. Not sure what motor we have here but look down from the front bearing position, there may be an edge of the main bearing visible that you can get to with a slanted drift.

Light taps spaced at 120 degrees will dislodge it but may damage the bearing.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Roger » Thu Sep 05, 2013 8:56 pm

Unfortunately the bearings diameter is slightly narrower than the barrel from the front, as in it steps down to the outside racer, so no edge. Tried again tonight and still stuck. Will soak for a day or two more and if no luck will try the cooking with bearing and either replace bearing or oil up as soon as it comes free.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Lemmy 3D » Thu Sep 05, 2013 9:29 pm

Hi there Sky,
A friend gave me a flat screw driver bent atnthe tip which is useful. But take the casing and bake it for a few min @ 180 degree celsius. Turn it over, with the back end facing down and smack it hard on a wooden board. Use the screw driver to tap on the inner race edge of the bearing either "pulling" or pushing on the bearing inner race towards the back end. This worked for me dunno if you tried it yet, but it works for me.Ps use a glove. :P
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Lemmy 3D » Sun Sep 08, 2013 9:02 pm

You come right Skybound?
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Roger » Mon Sep 09, 2013 8:01 am

Running out of options - even after boiling it for an hour in the OMO solution - that bearing is not budging.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by SteveJay » Mon Sep 09, 2013 8:56 am

What engine is it?
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Roger » Mon Sep 09, 2013 10:02 am

Revo 2.5 Ground hugging based application for this glow.

Just checked some of the forums and suggested that oven needs to go really hot to close on 400F. So maybe my attempt with heat gun was not hot enough.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Lemmy 3D » Mon Sep 09, 2013 10:09 am

Skybound wrote:Revo 2.5 Ground hugging based application for this glow.

Just checked some of the forums and suggested that oven needs to go really hot to close on 400F. So maybe my attempt with heat gun was not hot enough.
Thats why I suggested baking it @ approx 180 deg Celsius and it heats up evenly, heat gun more likely to cause deformity.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by SteveJay » Mon Sep 09, 2013 11:35 am

If the aperture in the ally expands more than the OD of the steel bearing, I guess that will be the better way to free the bearing - very keen to see the outcome.

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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by danie.e » Tue Sep 10, 2013 10:58 am

Skybound,

If you do not have a gas torch, go to your nearest speedy's exhaust and ask one of the techies there to heat up the crankcase with acetylene torch - especially around the area where the bearing nests. Take along a piece of wood and ask him to tap the bearing out on the piece of wood. He will have the right glove to handle the hot crankcase.

I repair a lot of engines for customers and this is THE method. All the other methods have been tried with varying success. This one is easy, no fuss, and works time and again.

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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Flubber » Tue Jul 15, 2014 9:17 am

Good Morning,

Just another example of the OMO trick.

Cheers

P.S. - The sleeve was out, just put it all back and then remembered to take a photo.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by omarb » Mon Aug 11, 2014 10:25 pm

Small tip, don be lazy and cook it in something else (like sunlight), go to the laundry room and get the OMO... Sunlights tarnishes the engine. I see MEK is suggested to clean the engine, will it restore the color after cooking in sunlight? OMO made no difference.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by Marauder » Thu Aug 28, 2014 12:33 pm

If you want to use "sandblasting", use Bicarbonate of Soda instead of sand. It leaves them as good as new without damaging sensitive areas.
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Re: Cleaning Model Glow Engines - Use of Antifreeze

Unread post by julway » Fri Jan 16, 2015 3:37 pm

Let's see how well I can explain this. :) :lol:
You can make the bearing extractors using key steel or round bar ground flat on the two mating surfaces. Number 1 is purely a piece of steel ground with a taper on one side.
Number 2 is a straight piece with a section ground out so the toe can slip on top of the bearing.
once 2 is in place, tap 1 in against 2 to "lock" 2 against the top of the bearing.
Knock bearing out by tapping 2, you will more then likely have to rotate and repeat for a even extraction.

Hope this helps, it has always worked for me. :D :D
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