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Engines - general questions.

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Tom Major03/12/2017 15:50:56
94 forum posts
22 photos

Work related experience. I used to maintain hotel for 1.5 years and believe it or not, we had most stuff from Wilko or BnQ. Tools, fastenings, you name it. I've seen my fair share of rounded off nuts, stripped threads etc .

Engine Doctor04/12/2017 11:20:59
2505 forum posts
39 photos

Hello Tom the crank thread is a 5mm x 0.8 pitch . Any decent fixing shop should be able to supply a quality steel nut.

If you google Model engine Crankshaft threads various list come up. Good job it wasn't OS 15 max as they had a odd ball thread 7/32 x 32 , an old ME model engineer thread rarely used and difficult to source replacements .

onetenor04/12/2017 13:40:40
1901 forum posts

The nuts maybe hard to get but taps are fairly easy to find. To find nuts try Model Fixings and Wheelspin models. and EKP supplies for nuts and taps and all your model fixings No I don't have shares before you ask.

Tom Major04/12/2017 17:49:40
94 forum posts
22 photos

I wouldn't think you do have any shares with them mate .

Thanks again for pointers, notes taken.

Today was not a good day... All props that I ordered last week still didn't turn up. Props for Cox most likely went missing in post, prop for .10FP was sold out before I ordered it and got message from shop followed by cancellation.

Oh well, finished work late anyway, might as well get back to .40FS and get them valves out and finally start putting it back together. I have a prop for this one :D

Tom Major14/12/2017 16:50:34
94 forum posts
22 photos

Hi .

I have some questions again. My .40FS is still in pieces and I didn't take valves out yet. I can't find my feeler gauges so didn't want to start another job I can't finish. Anyway, I've seen OS FS toolt kit containing said feeler gauges, but is it correct that this one kit is good for all OS four strokes? I don't know why, but I'd expect valve clearances to be slightly different on different engines...

In other news, .10FP is almost good to be installed in the model smiley. Had another test run today and managed to burn whole tank of fuel in one go, throttle response is ok, just airbleed screw needs some tweaks and I'll get going with little ship. Here are few final seconds before tank dried out.

Another thing, would you store brand new and unrun engine in oil or just wrapped in plastic bag? I finally received another Cox I bought few days ago and most likely won't run it anytime soon...



TartanMac14/12/2017 17:26:02
250 forum posts
157 photos

Sound like it is in good condition Tom pretty snappy response nice one yes

Denis Watkins14/12/2017 17:35:46
4415 forum posts
109 photos

Lightly oil and turnover, then into a plastic bag Tom

Airbleed, just screw halfway across a clear hole,

And I use the OS feeler gauge on all my 4 strokes, but I may be corrected

TartanMac14/12/2017 18:15:27
250 forum posts
157 photos

This is a link to the O.S 40FS manual you can get a lot of manuals online these days Great planes do the same.

Tom Major14/12/2017 20:19:57
94 forum posts
22 photos

I checked few OS four strokes and it looks like it will be the correct tool kit. Handy to know, ordering it now.

Thanks for the link TartanMac yes

dave windymiller18/12/2017 20:32:32
100 forum posts
139 photos

Going back to the earlier posts be aware that there are some odd size metric screws used on many engines

For example, my OS fp20 uses m2.6 screws on its backplate. m2.5 screws appear to "fit" but are loose and will most probably damage the thread if tightened

You can often get these odd sizes off ebay and they might have to come from abroad but are not expensive (10 of 2.6mm X8mm cap head for £2.60 inc post from china!)

Dont assume its 2.5, 3.0 or 3.5mm

Tom Major18/12/2017 20:37:29
94 forum posts
22 photos

Good point to remember.

As far as I recall, model fixings do have 2.6 and few other odd sizes in stock. Delivery was quick and prices not bad at all.

onetenor18/12/2017 22:40:13
1901 forum posts

Does this help at all?

Tom Major18/12/2017 22:58:09
94 forum posts
22 photos

Added to bookmarks, thanks!

Bigflyer8810/01/2018 20:50:14
19 forum posts
3 photos
Hi all random question but has anyone had any bad experience with sc engines out of the box, the reason I ask is that I just got my hands on a sc36 two stroke and the rear needle valve bracket does not fit the bolts on rear of the engine which I thort was bizarre but could mean it's the wrong needle valve All together! Any thorts?
Geoff S10/01/2018 21:35:14
3657 forum posts
26 photos

I've used SC needle valve brackets as remote needles fitted somewhere (on the firewall, usually) to make them easily accessible from outside the cowl. Someone could have done that and cut the original bracket short and drilled another hole. I think the SC/ASP engine dimensions are the same as OS, including the crankcase backplate, so it would be surprising if the bracket didn't fit as new and unmodified.


Bigflyer8810/01/2018 21:39:49
19 forum posts
3 photos
That's food for thought maybe but this engine is brand new that's what struck me as unusual and the bracket is too long rather than too short. Click only photo on the left and you'll see what I mean.

Edited By Bigflyer88 on 10/01/2018 21:48:10

Robin Colbourne11/01/2018 00:19:58
576 forum posts
17 photos

Bigflyer88, Somewhere between factory and delivery to you the needle valve assembly has probably got swapped with one from a larger engine. That could easily happen in a model shop, with several engine boxes open on the counter at once when showing them to a potential buyer.

Peter Miller11/01/2018 09:09:29
11065 forum posts
1296 photos
10 articles

I have bought a large number of SC engines new in box. Never had one that didn't fit.

Bigflyer8811/01/2018 10:11:48
19 forum posts
3 photos
Good call Rob cheers will get on the blower and get them to check.
robert chamberlain17/09/2018 03:04:48
142 forum posts

Hello all, I read an article from "The oily hand" and his comments about caster in 4 strokes.. I have 2 HP-VT four stroke rotary valve engines which say to run caster to better seal the rotating valve assembly. Any thoughts on just going to synthetic instead?-----------------Bob

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