Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


.020 Pee Wee sticking at top dead centre (Solved) Cox_ba12





Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
November-2022
cmulder's

"Throttle and muffler contraption"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


.020 Pee Wee sticking at top dead centre (Solved) Empty
Live on Patrol


.020 Pee Wee sticking at top dead centre (Solved)

Go down

Help! .020 Pee Wee sticking at top dead centre (Solved)

Post  thomaslowery Thu Jun 16, 2022 12:21 pm

(Solution in comments)

Newbie here I'm afraid!

I recently bought a cheap .020 Pee Wee on eBay and am trying to get her running but with no luck so far.

Basically once I start throwing it over it with fuel in it and the glow plug connected it will begin to intermittently stick at top dead centre. I will get consistent pops and even short bursts, but these always end with the engine sticking and causing the engine to stall.

It looked fairly clean and tidy when it arrived, it turned over nice and free with no sticking and good compression. I took apart the entire fuel system and soaked it in the fuel for a day, cleaned it off and reassembled it, however I did not touch the crank case and piston ect.

If anyone has any ideas as to what could be causing this I would greatly appreciate it!


Last edited by thomaslowery on Tue Jun 28, 2022 10:27 am; edited 1 time in total (Reason for editing : Issue has been solved)
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Marleysky Thu Jun 16, 2022 1:02 pm

Does it turn-over freely with the glowhead removed? Do you have a copper headgasket (or two) installed underneath the glow-head? It's possible that it's overcompressed when the glow head heats up with power applied, or the head needs the clearance of an additional copper gasket.
Marleysky
Marleysky
Top Poster
Top Poster

2020 Supporter

2021 Supporter

2022 Supporter

Posts : 3600
Join date : 2014-09-28
Age : 70
Location : Grand Rapids, MI

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  thomaslowery Thu Jun 16, 2022 1:42 pm

It actually turns over freely just with with no power supplied to the glow head, which would imply it is sensitive to the heat. Unfortunately I do not have the correct tool to remove the head, as I cannot seem to find any here in the UK, and shipping one from Canada would cost almost as much as the engine itself! I could try a pair of pliers or something to get it off, but I am worried I will damage the head? Or is it worth biting the bullet and paying the £23?
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Levent Suberk Thu Jun 16, 2022 2:07 pm

Engine flooded?
avatar
Levent Suberk
Diamond Member
Diamond Member

Posts : 1757
Join date : 2017-12-24
Location : Turkey

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  thomaslowery Thu Jun 16, 2022 2:33 pm

Levent Suberk wrote:Engine flooded?

I don't believe so, as the issue is intermittent and the engine won't start if I set the needle to a leaner mix
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  sosam117 Thu Jun 16, 2022 2:43 pm

thomaslowery wrote:It actually turns over freely just with with no power supplied to the glow head, which would imply it is sensitive to the heat. Unfortunately I do not have the correct tool to remove the head, as I cannot seem to find any here in the UK, and shipping one from Canada would cost almost as much as the engine itself! I could try a pair of pliers or something to get it off, but I am worried I will damage the head? Or is it worth biting the bullet and paying the £23?  

It is always good to purchase "two" wrenches.
One for the glow head and the other for the cylinder (which slides into the exhaust ports.)

With the two, "if" you try to remove the glow head, the cylinder might loosen from the crankcase.
Now "if" that happens, you can insert the 2nd wrench into the exhaust ports and unscrew the glow head from the cylinder without damage. Then you can screw the cylinder back onto the crankcase and tighten it with one of the wrenches.

One hint to remember is to heat up the cylinder and glow head and it will come apart a little easier. (remember to wear gloves!)
sosam117
sosam117
Platinum Member
Platinum Member

Posts : 850
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  thomaslowery Thu Jun 16, 2022 3:09 pm

sosam117 wrote:

It is always good to purchase "two" wrenches.
One for the glow head and the other for the cylinder (which slides into the exhaust ports.)

With the two, "if" you try to remove the glow head, the cylinder might loosen from the crankcase.
Now "if" that happens, you can insert the 2nd wrench into the exhaust ports and unscrew the glow head from the cylinder without damage. Then you can screw the cylinder back onto the crankcase and tighten it with one of the wrenches.

One hint to remember is to heat up the cylinder and glow head and it will come apart a little easier. (remember to wear gloves!)

Oh interesting, I'm glad you said otherwise I would have shipped one all the way cross the pond just to discover I needed two! In that case I think I will stock up on spares and tools from cox's website, as then the shipping will be a bit more reasonable in the grand scheme of things. Any other essentials I should get? Also do the spring starters actually help?
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  cstatman Thu Jun 16, 2022 4:28 pm

Thomas,

If you like, I will mail you TWO cox .020 Wrenches.

A feller on this very board is sending me something I need, I figure I should at least try to pass the goodwill along.

If you will PM me your mailing address? I will tape two wrenches to a card, plop 'em in an envelope and send them your way.

Charles
cstatman
cstatman
Gold Member
Gold Member

2022 Supporter

Posts : 338
Join date : 2021-02-17
Age : 58
Location : San Jose, CA

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  thomaslowery Thu Jun 16, 2022 4:47 pm

cstatman wrote:Thomas,

If you like, I will mail you TWO cox .020 Wrenches.  

A feller on this very board is sending me something I need,  I figure I should at least try to pass the goodwill along.

If you will PM me your mailing address?  I will tape two wrenches to a card, plop 'em in an envelope and send them your way.

Charles

Hi Charles,

That would be amazing, but don't feel you have to! I know how expensive international shipping can be!
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Oldenginerod Thu Jun 16, 2022 5:45 pm

Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3716
Join date : 2012-06-15
Age : 60
Location : Drouin, Victoria

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Ada99 Fri Jun 17, 2022 3:30 am

thomaslowery wrote:It actually turns over freely just with with no power supplied to the glow head, which would imply it is sensitive to the heat. Unfortunately I do not have the correct tool to remove the head, as I cannot seem to find any here in the UK, and shipping one from Canada would cost almost as much as the engine itself! I could try a pair of pliers or something to get it off, but I am worried I will damage the head? Or is it worth biting the bullet and paying the £23?  

The Cox 020 wrench is avaiable in the UK from Dens Models for £3.70:

(https://www.densmodelsupplies.co.uk/index.php?b=&t=&c=cox_020_spares&s=&p=020_wrench&pid=379)

Best Regards,
=Adrian=
Ada99
Ada99
Moderate Poster
Moderate Poster

Posts : 24
Join date : 2018-07-18

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Oldenginerod Fri Jun 17, 2022 4:35 am

Ada99 wrote:
thomaslowery wrote:It actually turns over freely just with with no power supplied to the glow head, which would imply it is sensitive to the heat. Unfortunately I do not have the correct tool to remove the head, as I cannot seem to find any here in the UK, and shipping one from Canada would cost almost as much as the engine itself! I could try a pair of pliers or something to get it off, but I am worried I will damage the head? Or is it worth biting the bullet and paying the £23?  

The Cox 020 wrench is avaiable in the UK from Dens Models for £3.70:

(https://www.densmodelsupplies.co.uk/index.php?b=&t=&c=cox_020_spares&s=&p=020_wrench&pid=379)

Best Regards,
  =Adrian=

Hey, is there an echo in here?  lol!
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3716
Join date : 2012-06-15
Age : 60
Location : Drouin, Victoria

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Ada99 Fri Jun 17, 2022 5:30 am

Oops - Sorry. I really should read to the end of the thread before posting!!

=Adrian=
Ada99
Ada99
Moderate Poster
Moderate Poster

Posts : 24
Join date : 2018-07-18

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Oldenginerod Fri Jun 17, 2022 6:38 am

Ada99 wrote:Oops - Sorry. I really should read to the end of the thread before posting!!

=Adrian=
Laughing Laughing Hey, no problem.  We've all done that before. "Great minds think alike".
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3716
Join date : 2012-06-15
Age : 60
Location : Drouin, Victoria

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  sosam117 Fri Jun 17, 2022 7:28 am

Another hint on using the "heat gun" for covering a plane is to use it on that old fuel line inside the fuel tank.
"If" that fuel line is rather old, it is hard to remove from the backplate.
Using the heat gun, heat the fuel line (not too much) and it will soften the line to where it will come off easy from the backplate.
Also, it will straighten the line to make removal of the spring inside the fuel line easier as well!

As for things you'll need:
The Cox .020 Pee Wee Overhaul kit should do it?

.020 Pee Wee sticking at top dead centre (Solved) Cox_0210


It has everything you will need to get your little .20 Pee Wee running again.


As for the starter spring.
It does help starting the engine on those smaller props, compare to flipping the engine with your finger.
"IF" you can spare the extra change I would get it. Makes things less frustrating on starting the engine!

.020 Pee Wee sticking at top dead centre (Solved) Cox_0211


Last edited by sosam117 on Fri Jun 17, 2022 7:29 am; edited 1 time in total (Reason for editing : spelling mistakes)
sosam117
sosam117
Platinum Member
Platinum Member

Posts : 850
Join date : 2016-03-23
Location : Suburb of Chicago, Illinois

Back to top Go down

Help! Fledgling

Post  Coxfledgling Sat Jun 18, 2022 4:33 am

Yes, densmodelsupplies is very good and helpfully.

It was very good of Charles to offer two wrenches, shows the "family" of this excellent forum.

I'm based in Snowdonia, caernarfon area Wales UK.

I dislike using the wrench via the exhaust ports...a little heat on the crank case and leather protective layer using a small pair of pliers....

Take your time with your little jewel of an engine. I have one that at some time will be going into a model, probably a cl one.

Enjoy...
Coxfledgling
Coxfledgling
Gold Member
Gold Member

Posts : 313
Join date : 2021-01-10
Location : Near Caernarfon, Snowdonia, Wales, UK

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  cstatman Mon Jun 20, 2022 1:29 pm

im not good. Im a grumpy old man

BUT!!! MarleySky helped me out with some unobtanium, and I figured i HAD some wrenches, I might as well pass em along.

After I returned form post office, I saw someone posted a rebuilt kit - gaskets, bits, etc.. (like the one sitting on my bench)and I was thinking I SHOULD have sent that too...
cstatman
cstatman
Gold Member
Gold Member

2022 Supporter

Posts : 338
Join date : 2021-02-17
Age : 58
Location : San Jose, CA

Back to top Go down

Help! Solved!

Post  thomaslowery Tue Jun 28, 2022 10:26 am

Marleysky wrote:Does it turn-over freely with the glowhead removed? Do you have a copper headgasket (or two) installed underneath the glow-head? It's possible that it's overcompressed when the glow head heats up with power applied, or the head needs the clearance of an additional copper gasket.

I think you were right about the over compression, I fitted a new glow head and gasket but it was still sticking. I then simply fitted a second new gasket and it went away.

After properly cleaning out and rebuilding the fuel system and needle I finally got it running!

Thanks for everyone's help, I am very grateful!
thomaslowery
thomaslowery
Beginner Poster
Beginner Poster

Posts : 9
Join date : 2022-06-16
Age : 22

Back to top Go down

Help! Re: .020 Pee Wee sticking at top dead centre (Solved)

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum