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Product engine question

Post  Ivanhoe on Fri Jan 06, 2012 12:35 pm

I'm restoring a very old product engine, the one with the red plastic backplate and no mounting. It's cleaning up well but the red plastic backplate is very dirty, it seems to have lain around for so long that the dirt has actually stained the plastic. Does anyone know how to clean it? I've tried most of the usual cleaners and it's a little better, but still looks very scruffy.

Wilf
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Re: Product engine question

Post  microflitedude on Fri Jan 06, 2012 12:43 pm

I am sure Mudhen can chime in here, as he has restored a lot of plastic backplates.
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Re: Product engine question

Post  GermanBeez on Fri Jan 06, 2012 1:04 pm

i'm familiar with the issue, my medallion has the same problem.
try srubbing it with an old toothbrush soaked in fuel, it helped my carb a little.
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Re: Product engine question

Post  Mark Boesen on Fri Jan 06, 2012 1:51 pm

I've had some luck with BRASSO metal polish, it's a very fine abrasive. It’s sold as a metal polish, but works on most plastics as well.
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Re: Product engine question

Post  GermanBeez on Fri Jan 06, 2012 2:16 pm

yup, but AS an abrasive, it TAKES AWAY material...not that good...
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Re: Product engine question

Post  EXModelEngines on Fri Jan 06, 2012 2:24 pm

The Brasso will work pretty well if it is mostly surface stuff.

I have had success removing a slight amount of material to achieve a new, clean surface. Usually the hard part is getting the right finish on the 'fresh' surface.

Matt
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Re: Product engine question

Post  Mudhen on Fri Jan 06, 2012 5:47 pm

microflitedude wrote:I am sure Mudhen can chime in here, as he has restored a lot of plastic backplates.
I guess I can't shut up.
The problem is the fuel/oil/gunk penetrated while the engine was hot. (With the pores open on the plastic.)
I have had good luck with this:
Put two tablespoons of Dawn dishwashing soap into about 1/2 gallon of water. Heat to hot, but not to boil. Let the carb soak for about an hour. I use a plastic strainer submerged in the pot so that the plastic carb does not contact the hot metal surfaces. You'll know that it's begining to work when the carb feels slimey. That's the oils coming to the surface. If you need more time, soak it for longer periods. This isn't fool proof, but it has worked in the past.
Mud
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Re: Product engine question

Post  Ivanhoe on Fri Jan 06, 2012 5:50 pm

Solved it! I thought I'd try one last idea, before resorting to brutal methods! I left it soaking in a dilute solution of household bleach for a couple of hours, it's come up nearly like new! Even the stains have come out, amazing!

Wilf
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Re: Product engine question

Post  Mudhen on Fri Jan 06, 2012 5:52 pm

Ivanhoe wrote:Solved it! I thought I'd try one last idea, before resorting to brutal methods! I left it soaking in a dilute solution of household bleach for a couple of hours, it's come up nearly like new! Even the stains have come out, amazing!Wilf

Bleach works, but:
It can cause the plastic to "splinter" and the screen may rust and decompose. Wash it thoroughly in warm/hot water.
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Re: Product engine question

Post  microflitedude on Fri Jan 06, 2012 6:14 pm

Ivanhoe wrote:Solved it! I thought I'd try one last idea, before resorting to brutal methods! I left it soaking in a dilute solution of household bleach for a couple of hours, it's come up nearly like new! Even the stains have come out, amazing!

Wilf

About what percent was Bleach?
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Re: Product engine question

Post  Ivanhoe on Fri Jan 06, 2012 6:22 pm

microflitedude wrote:
Ivanhoe wrote:Solved it! I thought I'd try one last idea, before resorting to brutal methods! I left it soaking in a dilute solution of household bleach for a couple of hours, it's come up nearly like new! Even the stains have come out, amazing!

Wilf

About what percent was Bleach?

Estimate, about 5 - 10%
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Re: Product engine question

Post  Mark Boesen on Fri Jan 06, 2012 11:40 pm

GermanBeez wrote:yup, but AS an abrasive, it TAKES AWAY material...not that good...

yep, its not fool proof, the idea is to take off the surface crud, you need to know when to stop.

Wilf,
Great discovery! I'll have try it sometime. Sound like the engines are comming around.

Mud,
Have you had any luck with the dreaded white residue left on plastic RTF's after clean-up?
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Re: Product engine question

Post  Ivanhoe on Sat Jan 07, 2012 7:25 am

Mark Boesen wrote:
GermanBeez wrote:yup, but AS an abrasive, it TAKES AWAY material...not that good...

yep, its not fool proof, the idea is to take off the surface crud, you need to know when to stop.

Wilf,
Great discovery! I'll have try it sometime. Sound like the engines are comming around.

Mud,
Have you had any luck with the dreaded white residue left on plastic RTF's after clean-up?

Yes, I'm workin' on 'em!
Re: the white residue left, I polished my backplate with wax furniture polish, gets rid if most of it & helps restore the original plastic sheen, might work on RTFs too, and no harm done if it doesn't.

Wilf
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