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"Cox Special MKII .15"



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Preventive maintainance

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Preventive maintainance

Post  Scratch049 on Fri Aug 31, 2018 8:31 am

I have a few Cox reed engines that I purchased.
One looks to be in very good shape.
The other is fairly gummed up and looks like the intake screen has been removed.
The last, looks like it has never been run.
I need suggestions as to how far I should take clean up, or tear down, before attempting to run them.
Asking because I have never taken one of these apart.
Thanks for any suggestions.
Scratch...
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Re: Preventive maintainance

Post  Kim on Fri Aug 31, 2018 8:37 am

Probably a good idea to take them apart, but if they'll turn over easy, you MIGHT consider bolting them to a stand to see if they'll run as-is. You may have some "runners" right out of the gate.
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Re: Preventive maintainance

Post  Cribbs74 on Fri Aug 31, 2018 10:21 am

I would suggest you do what Kim said and just see what ones need to be torn down.

I will add that these engines are very easy to tear down and put together. If you are willing just about everyone here can help you along as you go through them.

Ron
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Re: Preventive maintainance

Post  Marleysky on Fri Aug 31, 2018 10:26 am

+1 to what Kim said.

Also read this if you are totally unfamiliar with Cox engines: https://coxengines.ca/files/CMG.pdf

Get back to us if you have any problems or questions. There are many experienced members here willing to help.
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Re: Preventive maintainance

Post  fredvon4 on Fri Aug 31, 2018 12:58 pm

Clean large work area*....NOT over carpet!

set of correct tools....cox wrenches, small flat blade screw driver and the mandatory Pliers**

Piston reset tool

one or more Brass, stainless, or nylon small tooth brushes

91% wally world pharma alcohol

Q tips

Air tool Oil

Permatex anaerobic gasket maker

Fresh gaskets, reeds

* I work over a 2' x 3' table top with a WHITE towel so I can see all the dinky parts and they don't jump onto the floor

**The Pliers are to be hooked to a 100,000 KVA electric fence charger so every time you touch them you learn a valuable lesson



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Re: Preventive maintainance

Post  Scratch049 on Fri Aug 31, 2018 1:57 pm

Really appreciate the great response,Gentlemen.
The link from Marleysky is especially helpful.
I was able use it to download additional info.
Have everything FredVon mentioned or its on the way from Cox Int'l. including one gasket kit and one rebuild kit. May have to order again.

**The Pliers are to be hooked to a 100,000 KVA electric fence charger so every time you touch them you learn a valuable lesson
How 'bout I just put them where I can't find them. Very Happy
That's one thing that does frost me.  Mad
I examine any engine that I buy for those sort of tool marks.
Firm believer in the right tool for the right job.
Good tips on the work area.
Many thanks.
Scratch...
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Re: Preventive maintainance

Post  Davenz13 on Fri Aug 31, 2018 2:42 pm

Because manufacturers want you to buy their products they quite often exaggerate the abilities and outcomes of their products and no more so than in the realm of tools, powered or manual. Below is a carefully constructed description of the most common of such tools and the results that most will experience sometime during their use. Pliers are fourth on the list

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Re: Preventive maintainance

Post  944_Jim on Fri Aug 31, 2018 8:49 pm

While I understand Fred's reluctance to NOT work over carpet, I do want to say I prefer to.

That is, I prefer to sit on the floor on short light colored berber anytime I do carb work (or detailed "tiny, springy piece" work). Preferably in "fitted" shorts with very few places for springs, things and screws to hide in!

The springy pieces usually show up shiny against the light (think khaki or tan) carpet. Small screws can't bounce under the work bench, nor roll away. Ball bearings also lose their affinity for skittering away.

A month ago I broke my "rule" while working on a buddy's dirt bike. And promply lost the carb float needle AND it's separated retaining clip. I spent the better part of two hours looking to no avail. Fortunately the repair kit came with the two parts a few days later.

A week later something shiny caught my eye. It was the little retaining clip 4 feet from where it fell. The following week I pulled the float needle from a flip-flop!

And no, shag carpet won't help...gotta be berber (or a bath/beach towel) under my legs.
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Re: Preventive maintainance

Post  Dave P. on Fri Aug 31, 2018 10:39 pm

A flashlight is handy too.  If you drop a part, hold the flashlight low on the floor.  The part will flash and cast a shadow making it easier to see.

I work over a bar towel on my bench, low and well inside the edge, a foot or more. Dropped pieces falling a couple inches don't tend to go very far when hitting a a soft towel, unless they are spring-driven.  In that case, you're on your own.  A magnetic parts dish is a part of my disassembly kit too, set in the middle of the bench.  A couple of good sets of tweezers are a necessity.

Davenz13, you've obviously been in my shop when I've been in a hurry.  Thanks for the chuckle.
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Re: Preventive maintainance

Post  Dave P. on Fri Aug 31, 2018 10:40 pm

Oops. Double post.
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Re: Preventive maintainance

Post  balogh on Sat Sep 01, 2018 4:52 am

A large transparent plastic bag to do the dismantling and assembly of springy components inside may prevent loss of the tiny parts..
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Re: Preventive maintainance

Post  GallopingGhostler on Sat Sep 01, 2018 8:55 am

Scratch049 wrote:The other is fairly gummed up and looks like the intake screen has been removed.

The engine will run fine without the FOD screen. (FOD is a military term meaning "Foreign Object Damage", i.e. dirt particles possibly ingested during a crash.) Many engines including the Cox Medallions, OK Cubs, Wen Mac, Testors, most larger engines don't have this screen over venturi / carburetor opening.
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Re: Preventive maintainance

Post  Scratch049 on Sat Sep 01, 2018 1:29 pm

Thank you very much for your input,gentlemen.
I do have what may be a very ideal work station for small engines.
Used to do duty (oops!) as a baby work station.
Found it at a re-purpose store for forty five bucks.
Had a broken castor that was easily fixed.
The bin that once may have been a bath unit,will not allow small parts to escape.
A white pad would of coarse help with eye-balling small parts.

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Re: Preventive maintainance

Post  Dave P. on Sat Sep 01, 2018 1:34 pm

That really is the perfect setup, Scratch.  Might have to get one of those myself. Cloth diapers make great engine maintenance pads, if there are any left in the drawers!
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Re: Preventive maintainance

Post  fredvon4 on Sat Sep 01, 2018 1:56 pm

I actually had to mail order real cloth diapers recently...NONE locally of sale in three local towns

I think that changing station is a near perfect small engine repair platform....
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Re: Preventive maintainance

Post  Scratch049 on Sun Sep 02, 2018 7:21 am

Thanks guys.

Thanks for that.
Reminded me that I had a bunch put away. Very Happy
I hear you Fred.
Nothing but the plastic ones in the Stores.


Last edited by Scratch049 on Sun Sep 02, 2018 3:29 pm; edited 1 time in total (Reason for editing : cuz i kant spel)
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Re: Preventive maintainance

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