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Engine cleaning Empty Engine cleaning

Post  Coxfledgling Thu May 20, 2021 8:43 am

I know this had been covered many times, but since the weather here in Snowdonia has been horizontal liquid sunshine, I decided to do something I have been putting off for some time now.

A regularly lubed and turn over my stored engines from time to time, the merco 61 marine I have in a wood huntsman is stuck solid.

It was removed from the boat and soaked in brake fluid overnight, and freed off ok. It has ball race bearings so may have issues.

It was stripped down with no dramas and all parts cleaned, with bearings in situe.

Although the parts cleaned up ok, I tried normal petrol for cleaning. I know it works ok as I have used it before.

The c/case is soaking in meths at the moment, but will be given a heat cycle this evening to use momentum to try and remove the more difficult rear bearing, which is showing some corrosion staining/etching on the outer race, so could do with being removed for measurement/ numbers and replacement.

Model fixings stock bearings for many engines but I am not absolutely sure of the rear bearing measurement, hence the need for the bearing removal very carefully, just in case.

Anyways one of the other mercos i Have turns over but is stiff, I I have been cleaning/ stripping that down this morning, using meths only, which does a really good job, dissolving all the gunk and goooooo easily, more stubern sections just needing soaking and time to do its thing.

When done, and the merco 35, I will be moving onto the Cox 049' and td09's.

I am stripping and cleaning ready for use to make sure the crank lube channels are not gummed up and are clear.

Each engine will be run up on a tank of fuel then dissed with model technics after run oil prior to placing into plastic bags for storage whilst models are made for each engine.

The merco 29 will be going into an era model, the new black widow into a 2 channel fournuer free plan model, and some of the Cox 049's into c/l balsa fuz pt19's, and a mini skyman 2 channel hi winger.....

Busy time ahead at last.

Fuel and after run oil ordered and on its way...

So, your next engine clean down, try meths, methylated spirits, the purple ish fluid used for primus parraffin lamp and stove pre heating, camping stoves etc..

Coleman camping stoves never really caught on in the UK, pity because they are very very good. I have a very old chrome plated camping stove that I cannot seem to get parts for......any suggestions ?
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Post  cstatman Thu May 20, 2021 9:45 am

for your viintage coleman stove? have you tried this lad?

https://www.oldcolemanparts.com/home.php

he's been at it for too long, and like Cox Engine nutters, he has collected bucketloads of vintage Coleman Stove parts...



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Post  Coxfledgling Thu May 20, 2021 10:25 am

Thanks cstatman, will try him in a bit...

Merco 61 rear bearing out painlessly first strick with momentum method.

Hot oil, dip in crankcase count to ewiewiewi, with rag hold engine and struck down square onto wood, it fell out.

Crud/goooooo on inner faces, no w cooling down. Will clean and note down bearing numbers and measurements, then contact bearing supplier for new bearings.

Similar method to remove merco 29 cylinder, dip in hot oil, count to 20, very carefully grip cylinder flange and rotate out, no dramas.

Will clean up 29 finally and reassemble later.

Stuck carb, dip in hot oil, remove and carefully rotate via servo arm, it turns.

The hot oil softens the castor goooooo.

Clean clean clean, reassemble and run a tank thru engine, treat with after run oil.

I have been using 3 in 1 thin oil in the past, but no more.
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Post  Coxfledgling Thu May 20, 2021 12:21 pm

Engine cleaning Img_2017
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Post  getback Fri May 21, 2021 6:52 am

Good to know about the Coleman fuel never tried it but will keep in mind , I think just about anything kerosene base will work as that's what we used to use before cleaning solutions came out , and also gas which is very dangerous! When you said you heat the oil up is the fuel what your referring to ? Glad you got the bearing out for replacement. Very Happy
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Post  Coxfledgling Fri May 21, 2021 7:28 am

Coleman stoves and lamps etc. never really caught on in the UK, people didn't seem to think they were safe. Camping Gaz kit was the brand leader but several makes are on the market these days. If you have an SMS orange framed double burner butane stove, BIN it now !!! Many "accidents" with them in the day!!!!

I have an old coleman picnic stove which is brilliant on Coleman fuel but need some spares for it. Chrome tank ( brass ? ) 500 ? Model, A39....1939 pre war ???

Never tried Coleman fuel ( naphtha ?) for engine cleaning.

Methylated spirits contains ethanol. It's readily available in UK, not rediculiusely expensive ( £2.49 for 750ml ) and is good at cleaning a gummed up glow/diesel model engine. It was used as the pre heater for the primus etc. parraffin lamps, as it's clean burning, and stoves. Even just meths camping stoves where made, which I have used in the past.

I use an old saucepan with old engine oil for m/cycle chain cleaning/de watering and freeing off etc.

Old engine oil heated on a camping Gaz stove, dip in engine, count to 20 or so to expand the alloy c/case, firm strike down squarely onto wood, bearing dropped out first strike.

UK petrol is quite good at cleaning a gummed up glow engine and cheaper than meths. I filter the "dirty meths" for re use.

All this stuff takes place in a well vented shed, extinguisher handy. I take great care doing all this stuff, I do not want a fire on my hands/ in my shed etc.. !!!!

Will try some cellulose thinners next but that's even more expensive.

When I filter the dirty meths, its quite amazing how clogged the filter gets.

The meths its s filtered and appears clear and dirt free, so is re used to good effect.

I only use small amounts ( 200cc or so ) at a time, but it is a fire risk. I use gloves as well, I wear glasses these days.
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Post  iamplanecrazy2 Mon May 24, 2021 5:00 pm

My favorite for cleaning engines is Dawn Power Dissolver.
It used to be on shelves at the grocery store. As far as I know
it is now only available online. I get it thru Amazon. Works
fast and leaves metal finishes looking like new. Can discolor plastics
and will strip paint. Don’t be deceived by the pleasant odor,
it is not skin friendly. Also, don’t leave it on cast aluminum for
more than 30 minutes or so as it will discolor the finish.
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Post  Jason_WI Mon May 24, 2021 7:01 pm

For large glow engines that are severely castor stained I use straight green antifreeze in an old crock pot on low heat. I leave them in for 24 hours and take them out. Use a firm plastic brush and brush clean under warm water. Dry with a monokote heat gun and then lightly oil. I put new bearings in if it has them and cut new gaskets by hand. I use the antifreeze until it looks like sludge then recycle it.
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Post  dckrsn Mon May 24, 2021 9:30 pm

@iamplanecrazy2 wrote:My favorite for cleaning engines is Dawn Power Dissolver.
It used to be on shelves at the grocery store. As far as I know
it is now only available online. I get it thru Amazon. Works
fast and leaves metal finishes looking like new. Can discolor plastics
and will strip paint. Don’t be deceived by the pleasant odor,
it is not skin friendly. Also, don’t leave it on cast aluminum for
more than 30 minutes or so as it will discolor the finish.
Love ya bro, but that stuff is crazy $$$ now.
I'd like to try it ,but.....
I'm sure it was a lot cheaper on the shelf, but not now.
https://smile.amazon.com/s?k=dawn+power+dissolver&i=garden&ref=nb_sb_noss_1
 Bob
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Post  getback Wed May 26, 2021 9:23 am

Here is some stuff don't know how strong it is ?  https://www.walmart.com/ip/Dawn-Platinum-Powerwash-Dish-Spray-Dish-Soap-Apple-Scent-16oz/565044021?athcpid=565044021&athpgid=athenaItemPage&athcgid=null&athznid=PWVUB&athieid=v0&athstid=CS020&athguid=8be22477-007-179a90e478926c&athancid=null&athena=true
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Post  iamplanecrazy2 Wed May 26, 2021 10:40 am

I have not tried that kind of Dawn.

I buy the 6 pack of 32 oz bottles. Shipping is free. Comes out to $10.94 a bottle
One bottle will clean a LOT of engines if you don't waste it.
Its also awesome in the kitchen!
Heres a link:

https://www.amazon.com/Professional-Dissolver-Prewash-Commercial-Restaurant/dp/B007YMFYQ2/ref=sr_1_3?dchild=1&keywords=dawn+power+dissolver&pldnSite=1&qid=1621974461&s=home-garden&sr=1-3

Pour some in a small jar, loop parts together with soft thin wire and lower into jar. Shake gently.
Let soak about 30 minutes remove parts, scrub with tooth brush then rinse in hot water.
Dry parts and apply your favorite lube.
Cylinders may need a second soak. I just add more cleaner to the jar as needed.
For small parts that you can't put wire on just put them in a small dish and brush a
little cleaner on them.
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Post  iamplanecrazy2 Thu May 27, 2021 2:58 pm

About to disassemble and clean this 020. It’s about as nasty as the come. Engine cleaning 2f37b710
Engine cleaning C0f56210
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Post  iamplanecrazy2 Thu May 27, 2021 3:03 pm

Air and brush helped some. Not as bad as I thought. Engine cleaning 32639c10
Engine cleaning 87e55e10
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Post  iamplanecrazy2 Thu May 27, 2021 3:16 pm

Nice to see the back plate screws are not boogered up. From the looks of the starter spring it was being hard to start and the user thought winding the spring more would help. lol!Engine cleaning 68336410
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Post  iamplanecrazy2 Thu May 27, 2021 3:26 pm

Heating to loosen it up for disassembly. Engine cleaning 0e2f5d10
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Post  iamplanecrazy2 Thu May 27, 2021 3:41 pm

It came apart with no issues. High comp head is still good and reed looks ok so far. Fingers crossed for good compression. Engine cleaning 2fa69c10
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Post  iamplanecrazy2 Thu May 27, 2021 3:58 pm

Parts ready for a bath in dawn. Engine cleaning 0f5dd410
Engine cleaning 1345e710
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Post  iamplanecrazy2 Thu May 27, 2021 4:05 pm

I put reeds on the desk in a spot of dawn. Engine cleaning 62c5ad10
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Post  dckrsn Thu May 27, 2021 4:27 pm

I bet she runs great. Thumbs Up
Bob
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Post  iamplanecrazy2 Thu May 27, 2021 5:04 pm

I think so too Bob!
Here’s the parts after a scrub with a tooth brush, hot water rinse, and blow dry. I do clean stubborn spots between fins with the back edge of a #11 xacto blade. Next oil and reassemble. I used maybe a teaspoon of the dawn cleanser. I promise, it’s a great engine cleaner!Engine cleaning 1a558010
Engine cleaning 84aab110
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Post  sosam117 Thu May 27, 2021 6:12 pm

@iamplanecrazy2 wrote:About to disassemble and clean this 020. It’s about as nasty as the come. Engine cleaning 2f37b710
Engine cleaning C0f56210


Looks like the rest of the plane didn't survive the crash!
And the engine was probably nine inches into the dirt?
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Post  rsv1cox Thu May 27, 2021 6:15 pm

Hat's off to you, that ranks right up there with the grungiest engine that I ever cleaned.

Good thing you did not crock boil in A/F as it will significantly lighten anodizing.  

Great job so far. You can clean up those machine screws on a variable speed wire wheel. Wear safety glasses. And, remove the finish on the cylinder using a variety of methods, but straight vinegar works well, then refinish with some gun blue.
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Post  iamplanecrazy2 Thu May 27, 2021 6:27 pm

Engine cleaning 4b624910
Engine cleaning 83193610
Thank you! It was pretty nasty.

I tried the crockpot once, never again. Couldn’t stand the smell. Also, part of an O.S. 120 four stroke case was above the surface and that portion of the case was discolored. Turned it dark gray. Waste of good antifreeze.

Put the pee wee back together. New spring starter, prop, and spinner finished it off nicely. Compression is not great but sufficient to run. Now need to build something to put it on. Hope some find these posts useful! I had fun posting them. Laughing
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Post  rsv1cox Fri May 28, 2021 6:06 am

You did great, saving any Cox engine is pretty popular around here and I enjoyed your pictures.
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Post  Kim Fri May 28, 2021 6:48 am

YEAH!!!!!!!!!!

"SAVE THE PEE WEE"S!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"


Another Castor Slinger lives to sling again!


Good Job!!!!!!!!!!


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