Lydd Model Flying Club. Kents Best.

The Lydd Model Flyers are a BMFA Registered Model Aero Club on the Romney Marsh, UK.
 
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 Engine service

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Worzey

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Number of posts : 1299
Age : 45
Location : Ashford
Registration date : 2008-02-09

PostSubject: Engine service    Wed 30 Dec 2015, 9:40 am

A club member recently purchased a used engine (OS 26 Surpass) off Ebay. The engine appeared to be in good condition and with good compression, but was tight to turn over, even with the plug removed. As I was asked to look at it, I thought I would post some pictures of problem.....


Engine looks little used, but I suspect that a castor based fuel and a lean carbureter setting has left lots of burnt on carbon.



The gudgeon pin was seized into the piston, but free in the top end (small end) of the conrod. Lots (but not too much!!) 9f heat, a 2mm tap and an ounce or two of patience, saw the parts all seperated.





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Worzey

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Number of posts : 1299
Age : 45
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PostSubject: Re: Engine service    Wed 30 Dec 2015, 10:05 am

Here you can see the lubrication hole in the big end of the conrod, is blocked solid with castor. A recipe for more problems if the engine had been used, as was.


A pin, cotton bud and some petrol soon had the lubrication hole clear again.

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GBEE

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Number of posts : 2497
Age : 57
Location : Kent
Registration date : 2013-04-04

PostSubject: Re: Engine service    Wed 30 Dec 2015, 10:21 am

Blimey, that looks well gummed up mate, being the club numbty would after run oil have prevented that Question
I have never used it and is it any good Question
Just leaving Portsmouth on me post Christmas South Coast Tour Bravo
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Worzey

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Number of posts : 1299
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Location : Ashford
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PostSubject: Re: Engine service    Wed 30 Dec 2015, 10:26 am

After a soaking in petrol and a gentle clean with various brushes in my Dremmel, all parts cleaned up nicely. Even the bearings were cleaned up, freed off and lubricated to allow them to be reused!








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Worzey

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Number of posts : 1299
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Location : Ashford
Registration date : 2008-02-09

PostSubject: Re: Engine service    Wed 30 Dec 2015, 10:38 am

Gbee wrote:
Blimey, that looks well gummed up mate, being the club numbty would after run oil have prevented that Question
I have never used it and is it any good Question
Just leaving Portsmouth on me post Christmas South Coast Tour Bravo

Most modern fuels use very little, if any, castor oil. Castor isn't a bad lubricant but it tarnishes all the internals and if left to get hot, it then gets burnt on as a hard coke like layer.
Optifuel and Weston fuel don't use castor, but that doesn't mean your engine is safe. Methanol is hydroscopic (it attracts moisture) and nitromethane is corrosive. However, most of the modern fuels have some anticorrosion additives in them.
If you are using an engine regularly, then after run oil isn't needed. If you lay up an engine for more than a couple of months, then after run will certainly help avoid corrosion. Even a 2 stroke motorcycle oil works well as an after run.
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GBEE

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PostSubject: Re: Engine service    Wed 30 Dec 2015, 10:56 am

Gulp..I have never used any lay up oils in any of my engines and as you all know I am not the most regular of flyers lately pale
You have done a great job of cleaning up that engine Ian, you could even put that back on ebay as new and I know just the mug in Herne Bay who would bid hundreds for it lol! lol! lol!
Interesting post and useful tips mate...thanks for putting something worthwhile on here and sharing Bravo
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candyman

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Number of posts : 64
Age : 71
Location : Greatstone
Registration date : 2011-09-18

PostSubject: Re: Engine service    Wed 30 Dec 2015, 3:30 pm

What I'd like to know, is what kind of pillock would buy a engine in that condition, it's lucky we have someone in the club like you Ian.
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GBEE

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PostSubject: Re: Engine service    Wed 30 Dec 2015, 4:13 pm

candyman wrote:
What I'd like to know, is what kind of pillock would buy a engine in that condition, it's lucky we have someone in the club like you Ian.
.
Hi Colin...I am that Pillock geek geek lol! lol!
I bid for a small diesel engine on ebay a couple of years back .and kept bidding & bidding Embarassed Embarassed
The seller said one flick and she runs sweetly, I certainly was Del Boyed for sure the swine. It was a pile of shite mate and I won nob of the year again lol! lol!
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Worzey

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PostSubject: Re: Engine service    Mon 18 Jan 2016, 11:59 pm

Adrian
I have managed to remove the rocker cover screw on your OS 30 and have examined the cylinder head. The exhaust valve seating was good, but the inlet valve was letting by a little. I have managed to lap the valve into the seat and get an improved seal. However, the piston ring to liner seal is not very good and the bottom end bearing is quite worn.
I am happy to fit a new piston ring and conrod, but, the engine is around 8 years old, has had lots of use and should maybe be put in your display cabinet..... it's up to you.



The inlet valve after being lapped in. Although black, the exhaust valve is seating as well as can be expected, so it was left alone.
A new glow plug once in a while wouldn't hurt......you tight git!!
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rotorman

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Age : 56
Location : greatstone
Registration date : 2010-09-10

PostSubject: Re: Engine service    Tue 19 Jan 2016, 1:31 pm

Thanks Ian for getting the screw out and working your magic on this poor tired engine. I think even a new plug would not rescue this one.
It was a bit telling when Colin's 26 was considerably more powerful.
Thanks again.
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GBEE

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PostSubject: Re: Engine service    Tue 19 Jan 2016, 2:12 pm

I have a 1.5cc Sabre DC engine going for 325 Adrian if your interested...great runner lol! lol! lol!
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Rainman

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Number of posts : 1086
Age : 16
Location : Lympne
Registration date : 2008-02-06

PostSubject: Re: Engine service    Tue 19 Jan 2016, 3:06 pm

Gbee wrote:
I have a 1.5cc Sabre DC engine going for 325 Adrian if your interested...great runner lol! lol! lol!

Gary, it that price includes a prop I might take it off your hands mate. geek
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GBEE

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PostSubject: Re: Engine service    Tue 19 Jan 2016, 3:18 pm

Mmmmmmm... a bit cheeky Ray but go on then 😂😂😂
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GBEE

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PostSubject: Re: Engine service    Tue 19 Jan 2016, 3:49 pm

I'll even throw in a receiver mate 😆😆😆
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grounded

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PostSubject: Re: Engine service    Thu 21 Jan 2016, 1:00 pm

Only 325 for a DC Sabre...a snip...brilliant little diesels Bravo

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GBEE

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PostSubject: Re: Engine service    Thu 21 Jan 2016, 5:51 pm

grounded wrote:
Only 325 for a DC Sabre...a snip...brilliant little diesels Bravo
I wish mine was Dave, I was well Del Boyed on ebay the swine Embarassed Embarassed Anybody else ever bought a pile of shite on Conbay Mad


Last edited by Gbee on Thu 21 Jan 2016, 8:07 pm; edited 1 time in total
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Rainman

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PostSubject: Re: Engine service    Thu 21 Jan 2016, 6:04 pm

Probably easier to ask who hasnt Gary! scratch lol!
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GBEE

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PostSubject: Re: Engine service    Thu 21 Jan 2016, 8:12 pm

lol! lol! Yes I think we've all been stitched up at some point but thinking we've got a real bargain lol!
The seller is laughing his socks off 300 miles away up North knowing some mug down South has just paypal'ed him geek geek geek
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grounded

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PostSubject: Re: Engine service    Tue 26 Jan 2016, 1:26 pm

Someone once said "If something seems too good to be true it probably is" Crying or Very sad

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GBEE

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PostSubject: Re: Engine service    Tue 26 Jan 2016, 3:32 pm

Very true Dave but I have still no learnt anything from it mate 😠
By the way I received my BMFA membership renewal yesterday so many thanks! 👍👍👍
Hows the new job Going?
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grounded

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PostSubject: Re: Engine service    Fri 29 Jan 2016, 8:47 pm

SSDD mate but at least its a job lol!

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GBEE

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PostSubject: Re: Engine service    Fri 29 Jan 2016, 11:29 pm

Ditto Crying or Very sad
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