replacing piston & sleevenew sleeve is really tight
06-02-2015, 05:28 PM
#29
That's a Stevens Aeromodels Scram. 18" wing span. If you use the model as a scale you can get an idea of his mass... I'm guessing 98lbs. His clothes are hanging off of him and you can barely make out an arm of any size.
http://www.stevensaero.com/StevensAe...-SCRAM100.html
Isn't he just adorable.... (Smiles)
Now I understand why he quit flying engine powered models.... he couldn't carry them.... Much less a flight box.
He talks trash about other people like he's a big man. Curse words, F-bombs a real tough guy.
Of course he knows he'll never have to stand face to face with those that he berates.
When you get a good look at him, and once he's been weighed and measured its obvious he's just a pathetic troll that hides behind his keyboard.
Be careful what you say about people you don't know. You got that Konrad.
http://www.stevensaero.com/StevensAe...-SCRAM100.html
Isn't he just adorable.... (Smiles)
Now I understand why he quit flying engine powered models.... he couldn't carry them.... Much less a flight box.
He talks trash about other people like he's a big man. Curse words, F-bombs a real tough guy.
Of course he knows he'll never have to stand face to face with those that he berates.
When you get a good look at him, and once he's been weighed and measured its obvious he's just a pathetic troll that hides behind his keyboard.
Be careful what you say about people you don't know. You got that Konrad.
Last edited by Broken Wings; 06-04-2015 at 01:56 AM.
06-02-2015, 06:57 PM
#30
LOL.
Spelling lesson for those reading who may have questions as to some terms used in model engines and modeling forums that some get confused by.
Forum (noun):
Form (noun):
Taper (noun):
1.
diminish or reduce or cause to diminish or reduce in thickness toward one end.
"the cylinder tapers near the top"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]narrow, thin (out), come to a point, attenuate"the leaves taper at the tip"[/TD]
[/TR]
[/TABLE]
Not to be confused with:
Tapper (noun):
1.a person or thing that taps or strikes lightly.
"The tapper will tap maple trees to collect sap for making maple syrup"
Pearls (noun):
Not to be confused with:
Shinny (verb):
another term for shin
"he loved to shinny up that tree"
Spelling lesson for those reading who may have questions as to some terms used in model engines and modeling forums that some get confused by.
Forum (noun):
- 1.
a place, meeting, or medium where ideas and views on a particular issue can be exchanged.
"it will be a forum for consumers to exchange their views on model airplanes and model engines"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]meeting, assembly, gathering, rally, conference, seminar, convention, symposium, colloquium, caucus;[/TD]
[/TR]
[/TABLE]
Form (noun):
- 1.
the visible shape or configuration of something.
"the form, color, and texture of the plane's covering"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]shape, configuration, formation, structure, construction, arrangement, appearance, exterior, outline, format, layout, design"the general form of the landscape"[/TD]
[/TR]
[/TABLE]
Taper (noun):
1.
diminish or reduce or cause to diminish or reduce in thickness toward one end.
"the cylinder tapers near the top"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]narrow, thin (out), come to a point, attenuate"the leaves taper at the tip"[/TD]
[/TR]
[/TABLE]
Not to be confused with:
Tapper (noun):
1.a person or thing that taps or strikes lightly.
"The tapper will tap maple trees to collect sap for making maple syrup"
Pearls (noun):
- 1.
a hard, lustrous spherical mass, typically white or bluish-gray, formed within the shell of a pearl oyster or other bivalve mollusk and highly prized as a gem.
- 2.
a precious thing; the finest example of something.
"the nation's media were assembled to hear his pearls of wisdom - Not to be confused with:
- Purls (verb):
verb
3rd person present: purls- knit with a purl stitch.
"knit one, purl one"
Shiny (adjective):
adjective
- knit with a purl stitch.
Not to be confused with:
Shinny (verb):
another term for shin
"he loved to shinny up that tree"
Last edited by 1QwkSport2.5r; 06-02-2015 at 07:06 PM.
06-02-2015, 07:20 PM
#32
06-02-2015, 10:10 PM
#33
All these guys have some good hints- I have been disassembling motors from small glow, gas, electric, motorcycles, race engines, diesel, and aircraft turbines going back to 1954. My method for sleeved motors has always been the same- store the sleeve in the coldest freezer you can find,(20 degrees below zero is best) for 2 hours. Remove parts like sealed bearings from the block, then put the block or cylinder in a toaster oven (for small motors) at 200 degrees and warm it for 2 hours. Wearing oven mitts or heat proof gloves take both parts out and immediately push the sleeve down into the cylinder in one quick push. It helps to put some index marks on both parts to be able to get the alignment right. The sleeve won't shrink much-only .002-003 inch but you need all you can get. The aluminum cylinder will expand a little more than that resulting in a loose fit. As soon as the two parts come together they will affect each other quickly but if you are quick it will slide right in. Don't stop the push until it is seated, it may get stuck. If you don't want to risk it take it to a machine shop-they do this stuff all the time. Don't beat on the parts but making a wood cradle supporting the cylinder and putting a wood block on top of the sleeve and pushing together with a drill press works pretty good.
Most model engines are fitted with zero clearance and may slide in with out the heat/cool procedure, but you won't know that until it either fits or sticks. The heat/cool method always works for me. Years ago I used this on my ducted fan engines (K&B, OS MAX, Rossi) on a regular basis. PIstons usually need to be in the cylinder before you start and the piston-rod needs to be properly oriented, some pistons have an offset in the wrist pin hole. Rods have lube grooves and holes and only go in one way. ABC piston-sleeve combinations are too tight at the top of the cylinder to be able to install the piston after the sleeve is pressed into the cylinder, piston goes in the bottom of the sleeve.
Most model engines are fitted with zero clearance and may slide in with out the heat/cool procedure, but you won't know that until it either fits or sticks. The heat/cool method always works for me. Years ago I used this on my ducted fan engines (K&B, OS MAX, Rossi) on a regular basis. PIstons usually need to be in the cylinder before you start and the piston-rod needs to be properly oriented, some pistons have an offset in the wrist pin hole. Rods have lube grooves and holes and only go in one way. ABC piston-sleeve combinations are too tight at the top of the cylinder to be able to install the piston after the sleeve is pressed into the cylinder, piston goes in the bottom of the sleeve.
06-03-2015, 02:38 AM
#34
I've never had to heat a crankcase to install a liner - just cleaned the outside of the liner and inside of the crankcase and in it goes. An old engine with lots of time on it and usage of castor oil in the fuel would likely warrant heating the case to get the liner out.
Last edited by 1QwkSport2.5r; 06-04-2015 at 03:37 PM. Reason: Changed wording to read better
06-03-2015, 06:12 AM
#39
My Feedback: (11)
I've been reading this all along, and there has been some confusion indicated and also some wrong information posted.
With model engines, and likely other full-size engines, too, it is not unusual for some engines to be manufactured such that the crankcase and cylinder liner have a very tight fit. To get them to properly slide together requires that the case must be heated. That does not mean that the engine is manufactured incorrectly.
With O.S., their high-performance engines sometimes required that you heat the case to extract or install the cylinder liner. Many SuperTigre engines were the same way, especially the older ones. With other engines, burned fuel residue would act as a glue and you'd need to heat the case to free the liner from the "glued" effect.
With model engines, and likely other full-size engines, too, it is not unusual for some engines to be manufactured such that the crankcase and cylinder liner have a very tight fit. To get them to properly slide together requires that the case must be heated. That does not mean that the engine is manufactured incorrectly.
With O.S., their high-performance engines sometimes required that you heat the case to extract or install the cylinder liner. Many SuperTigre engines were the same way, especially the older ones. With other engines, burned fuel residue would act as a glue and you'd need to heat the case to free the liner from the "glued" effect.
06-03-2015, 06:46 AM
#40
I own high performance engines as well as average sport engines and none of them have required heating the case to install the liner. I don't have every engine brand ever made, but I have enough to form what I feel is a reasonable belief that a snug fit is normal. Just my opinion, so take it for what it is. I speak of model engines only- full size engines aren't really comparable to model engines IMO.
Again, just my opinion. I'll eat all of my words if I ever come across an engine that requires heating the case to remove and install a liner in a new engine.
Again, just my opinion. I'll eat all of my words if I ever come across an engine that requires heating the case to remove and install a liner in a new engine.
Last edited by 1QwkSport2.5r; 06-04-2015 at 03:40 PM.
06-03-2015, 12:31 PM
#41
My Feedback: (102)
Join Date: Dec 2001
Location: Colonial Beach, VA
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I can vouch for the ST engines being very hard to get the liners in and out, the OS LA engines, the liner is a very precise slip fit. That Webra I pictured, you couldn't get that sleeve out with a jack hammer.
06-03-2015, 12:41 PM
#42
I must have some really rare engines then - I have a half dozen ST engines (all Italian) and I had no problem sliding the liners out. Ringed or ABC, all the same. Even the Foxes I own have a slip fit. The Novarossi 3.5 I have probably has the loosest liner to case fit of them all.
Irvine and Webra is on my list of engines to obtain and collect at some point... I'd like to get some Norvel's too.
Irvine and Webra is on my list of engines to obtain and collect at some point... I'd like to get some Norvel's too.
Last edited by 1QwkSport2.5r; 06-04-2015 at 03:41 PM.
06-03-2015, 01:28 PM
#44
LOL.
Spelling lesson for those reading who may have questions as to some terms used in model engines and modeling forums that some get confused by.
Forum (noun):
Form (noun):
Taper (noun):
1.
diminish or reduce or cause to diminish or reduce in thickness toward one end.
"the cylinder tapers near the top"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]narrow, thin (out), come to a point, attenuate"the leaves taper at the tip"[/TD]
[/TR]
[/TABLE]
Not to be confused with:
Tapper (noun):
1.a person or thing that taps or strikes lightly.
"The tapper will tap maple trees to collect sap for making maple syrup"
Pearls (noun):
Not to be confused with:
Shinny (verb):
another term for shin
"he loved to shinny up that tree"
Spelling lesson for those reading who may have questions as to some terms used in model engines and modeling forums that some get confused by.
Forum (noun):
- 1.
a place, meeting, or medium where ideas and views on a particular issue can be exchanged.
"it will be a forum for consumers to exchange their views on model airplanes and model engines"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]meeting, assembly, gathering, rally, conference, seminar, convention, symposium, colloquium, caucus;[/TD]
[/TR]
[/TABLE]
Form (noun):
- 1.
the visible shape or configuration of something.
"the form, color, and texture of the plane's covering"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]shape, configuration, formation, structure, construction, arrangement, appearance, exterior, outline, format, layout, design"the general form of the landscape"[/TD]
[/TR]
[/TABLE]
Taper (noun):
1.
diminish or reduce or cause to diminish or reduce in thickness toward one end.
"the cylinder tapers near the top"
[TABLE="class: vk_tbl vk_gy"]
[TR]
[TD="class: lr_dct_nyms_ttl"]synonyms:[/TD]
[TD]narrow, thin (out), come to a point, attenuate"the leaves taper at the tip"[/TD]
[/TR]
[/TABLE]
Not to be confused with:
Tapper (noun):
1.a person or thing that taps or strikes lightly.
"The tapper will tap maple trees to collect sap for making maple syrup"
Pearls (noun):
- 1.
a hard, lustrous spherical mass, typically white or bluish-gray, formed within the shell of a pearl oyster or other bivalve mollusk and highly prized as a gem.
- 2.
a precious thing; the finest example of something.
"the nation's media were assembled to hear his pearls of wisdom - Not to be confused with:
- Purls (verb):
verb
3rd person present: purls- knit with a purl stitch.
"knit one, purl one"
Shiny (adjective):
adjective
- knit with a purl stitch.
Not to be confused with:
Shinny (verb):
another term for shin
"he loved to shinny up that tree"
06-04-2015, 03:46 PM
#46
I was a bit snide in some of my replies. I edited the wording in several posts. To the RCU fellas that replied in this thread, my apologies. I did not mean any disrespect. I have my opinion (which is strong on many subjects) and it bests me sometimes. I'll be doing a bit of research on this subject further so I'm better informed. Again - sorry fellas.
06-04-2015, 04:12 PM
#47
T
Isn't he just adorable.... (Smiles)
Now I understand why he quit flying engine powered models.... he couldn't carry them.... Much less a flight box.
He talks trash about other people like he's a big man. Curse words, F-bombs a real tough guy.
Of course he knows he'll never have to stand face to face with those that he berates.
When you get a good look at him, and once he's been weighed and measured its obvious he's just a pathetic troll that hides behind his keyboard.
Be careful what you say about people you don't know. You got that Konrad.
Isn't he just adorable.... (Smiles)
Now I understand why he quit flying engine powered models.... he couldn't carry them.... Much less a flight box.
He talks trash about other people like he's a big man. Curse words, F-bombs a real tough guy.
Of course he knows he'll never have to stand face to face with those that he berates.
When you get a good look at him, and once he's been weighed and measured its obvious he's just a pathetic troll that hides behind his keyboard.
Be careful what you say about people you don't know. You got that Konrad.