Engine Cleaning - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-26-2007, 06:00 AM   #11
Ed Smith

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What I did was take off the carb (whick is plastic) and immerse it in heated antjfreeze in a pot pourri pot (a miniature crock pot) and left it to stew for two days.
Leaving the engine assembled can harm the engine. The engine should be disassembled. As much as the exterior dirt is being removed so is the interior dirt. Without disassembling the engine the lumps of dirt are left floating around inside the engine, possibly in the bearings, between the piston and liner and in four strokes in the cam train and rockers. I always disassemble the engine.

Ed S
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Old 10-26-2007, 10:45 AM   #12
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I assume most engines are taken apart because of an unplanned contact with earth. Sometimes itís just for cleaning and sometimes a complete rebuild is called for. In either case keeping the outside crud from getting inside is desirable as it can cause additional damage when parts are slid apart as the engine is disassembled.

If the engine has been in a crash DO NOT roll the engine over more than needed for disassembly or cleaning. There may be debris inside and you can do considerable damage.

First I remove the motor from the frame but leave everything attached including the muffler. I use what ever I can to clean out the carb and exhaust of visible bits and pieces especially if there has been a crash and dirt and debris are visible. Plug all openings with bits of cloth rag and then I wash the whole thing in warm water and dish detergent rinsing with clean water.

I have purchased a soft brass wire wheel (be sure it is soft brass not coated steel that you find at CDN Tire) soft brass wheels usually can be identified by their wooden hubs. I gently wire wheel as much crud as I can off the engine. Take your time its well worth it then wash again as mentioned previously.

Now I carefully disassemble the engine completely. Knowing most of the loose stuff will not accidentally contaminate the inside of the engine.

Now is the time to clean each part to get the rest of the crud off. I use the brass wire wheel when I can and assorted hand brushes to do the job.

The final cleaning is done with the same fuel that will run in the engine. I usually put aside the last 1/2 inch to 1 inch of each gallon of fuel and use it for cleaning purpose because this last inch is most likely to be the most contaminated you will run through your motor. Next time you get down to that last inch, hold it up to the light and swirl it around.

I place the cleaned parts in a Tupperware type container with a lid until I am ready to assemble the engine. A piece of masking tape on the lid and all pertinent info on the engine can be kept.

You must decide if you will be replacing the bearings or not. My opinion is in most cases you have the engine down this far it only makes sense to spend a few more dollars and replace the bearings.

I assemble my engines with Klotz Techniplate pure synthetic oil as it is the same oil as used in Wildcat Fuel which is the fuel I use. I do not believe in putting anything in these small motors that does not normally run thru them.

I have tried the antifreeze method both in a crock pot and just left in a container till it loosens the crud. Both times the finish seemed to be etched or dulled on the outside and I found the engine tarnished much easier than before. Wire wheeling with the brass wheel and cleaning with hand brushes take longer and more elbow grease but I like the result better. This is only my personal preference I imagine there is any number of ways to do the same thing and they probably work just as well. With all the suggestions you should be able to find a system that works for you.

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Old 10-27-2007, 08:21 AM   #13
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The antifreeze is a caustic which is corosive and the reason you wouldn't want to leave it in to long and the reason it is turning dark as it is gradually eating away the serface. I do the same as you, Dennis. I save the last 1/2 in. of fuel and put it into a nylon Tupperware tub about the size of a brick. I duct taped to the side, an old vibrating electric pencil. Poor mans sonic cleaner. I clean it up with a soft brass wire brush afterwards.
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