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Member postings for Engine Doctor

Here is a list of all the postings Engine Doctor has made in our forums. Click on a thread name to jump to the thread.

Thread: Repairing Damaged crankcase thread.
24/05/2020 12:13:59

 I thought I would share this repair with you as I see loads of otherwise good engines being sold as scrap or bodged with glue . This is a repair that will last and is as strong as the original casing .

I recently bought a McKay 30cc petrol engine that had a damaged exhaust mounting thread on the crank case . These are excellent engines and after recently selling one and regretting it shortly after I thought this is an opportunity worth taking a chance on .

The first pic is of the damaged mounting . This was drilled out and the cracks around the mounting have been ground out to clean and allow them to be filled 124_2419.jpg

The crank case was completely stripped apart from the small nipple , as this would be fine during the repair process , and was then thoroughly de-greased

Edited By Engine Doctor on 24/05/2020 12:15:55

Thread: Laser Engines - Technical questions
24/05/2020 11:17:53

Dave when you have used your existing fuel replace it with the fully synthetic. Even 2% castor makes a mess and cokes parts up . Southern model craft fuel is good honest fuel and Dave will tel you exactly whats in it . Used SMC fuel for years and never had a problem .

Thread: 6EXP 35MHz Upgrade Options
18/05/2020 17:46:26

If you want to convert to 2.4 then the FrSky hack module is no longer available /in production . You might be lucky to find one on the classifieds but dont hold your breath . Don't know about the Corona gear

Thread: Looking for fine control snakes
16/05/2020 17:25:13
Posted by Mike T on 16/05/2020 16:50:58:

PTFE tube. Select small dia. steel, stainless steel or carbon rods to suit. As used on DLGs

yes + 1 for fine PTFE tube and thin piano wire

Thread: Has anyone heard from Jeff2Wings ?
14/05/2020 13:53:07
Posted by Jon - Laser Engines on 14/05/2020 09:43:39:

J2W's last post was april 13th

Edited By Jon - Laser Engines on 14/05/2020 09:44:04

Hi Jon PM sent

Thread: Irvine 61 Muffler
13/05/2020 14:17:51

yes + 1 for the genesis mini pipes . Alan can make them to suit most applications . BCM make a sort of muffler in a pits style . I say a sort of muffler as they don't seem to quieten the exhaust much just point it away from the model like most so called silencer/ mufflers do . Krumschied make excellent mufflers but not sure whether or not they make one for a 60 size engine

It wouldn't be too hard to make an extender from a piece of solid alloy . provided you can get long enough high tensile mounting bolts

Thread: Muffler mods and making
13/05/2020 14:08:23

Hi Cymaz . I recently tried this with a silencer on a pressure washer that my son bought . It was horrifically loud so needed a few mods. I extended the fitted muffler with a tube like you have fitted and used small holes instead of slots . this extended out of the original silencer and I then made welded a absorption type silencer onto the stub . Still loud but stopped the crackle that hurt the ears . Hope you have better luck . I have made some in cowl silencers in the past that have worked reasonably well .

Krumschied silencers are excellent but at £70 to £100 a pop are too expensive to cut open and copy . Have you finished it yet ? Is it any quieter ?

Thread: Has anyone heard from Jeff2Wings ?
13/05/2020 13:55:29

As per title , has anyone heard from Jeff ? I have tried to contact him a few time via PM but no reply ?


Thread: The Lockdown Restrictions Have Been Relaxed. Who's Been Flying?
13/05/2020 13:45:41

We decided to keep our field closed . The relaxation of the rules is aimed at people from the same household or one other person from a different household with social distancing . And then all toilet have to be kept close sanitizer used when opening and closing gates etc. So many hoops to jump through so com decided to keep closed until next review in three weeks . Very frustrating but with over 100 members how do you limit numbers on field and police all the requirements etc ?

What are other clubs doing ? Most of our local clubs seem to be staying closed.

Thread: The Darkest Hour.......
10/05/2020 11:59:36

An excellent film . Churchill a great man , whether you liked or disliked him was needed at the time . If all the other politicians had had their way things would have been very different for us

Thread: Binding undercarriage using solder and wire
09/05/2020 12:59:44
Posted by Doc Marten on 09/05/2020 12:35:37:

Bakers flux is great for this job, I read an article by the late, great Brian Winch on making "Killed Spirit" which is very similar to Bakers apparently?

Hi Doc I believe the Baker fluid is the same as " Killed Spirit"

Just looked on ebay and wow has it rocketed in price !! A tiny bottle anything from £13 to £25 !! should be re-named Bakers Gold surprise

09/05/2020 12:16:35

The main requirements for a strong joint hen making undercarriages are clean wire including the binding wire, enough heat for the job , a good aggressive flux .

Cleaning , as already said earlier use wire wool or glass paper. Don't use emery cloth ,wet and dry as they contaminate the surface of the wire. Make sure the binding wire is also cleaned before binding the joint. Tin the parts before assembly as this will make final assembly much quicker and stronger. Tack the joint with solder before binding and aligning can help .

Instead of using copper wire for binding a strip of tin plate can be used . This takes solder very well and makes a very neat strong joint on u/c joints.

A large enough soldering iron that can quickly supply the needed heat to the job. Using a flame can cause damage to the wire and overheat the job unless very experienced.

Flux. A good aggressive flux like Bakers Fluid is a great help . Don't use it on anything electrical or sensitive and wash parts in soapy water when job is complete. Flux cored solder can be used but make sure all parts are properly tinned before assembly.

Finally a simple jig that holds the u/c in position while soldering will help enormously.

Good luck let us know how you get on.

Thread: Contagion, a film to watch
04/05/2020 11:54:40

No shortage of PPE in the films , or did I miss that bit ? The last UK pandemic exercise for emergency services was in 2016 I think ? Why wasn't the need for PPE for our emergency workers flagged as priority ? Probably money as usual !

Was it in Contagion that the powers that be intended to incinerate the Ebola hotspot with a bomb ? I hope that no politicians take any ideas away from that sad

Thread: Flying through covid !
03/05/2020 18:17:17

Thanks for the link Mark . I tried for a while and gave up in the end.

03/05/2020 11:42:44

One of our club members has really been affected by the lock-down

Its driven him to this !


Edited By Engine Doctor on 03/05/2020 11:56:11

Thread: Abused Laser
02/05/2020 11:46:58

It amazes me that there are still modellers about who think it's ok to put a screw driver into a cylinder to lock an engine while they tighten the prop !!!! Similarly there are LMS ,who should know better that still sell piston stoppers that screw into the glow plug thread to lock engines while fitting props or clutches . Because these piston stoppers are usually all nicely anodised and sold by the LMS the un initiated think they must be ok . They will damage a piston often causing catastrophic failure .

Engine abuse is rife. I recently bought a load of used engines as spares or repair. Many had been mistreated but were saveable . One though is an absolute horror ! Its an Enya 90 fs It has had an alloy exhaust pipe welded to the head !!! And the crank shaft thread cut down for some reason. Prior to that it had been run on castor based fuel so looks like a welded chopped chip pan ! By

Thread: Gorilla glue
02/05/2020 11:17:47

Gorilla glue original the brown stuff is excellent for glueing poorly fitting joints. Also good for fitting hinges, mending foam etc the list goes on. It sands very well and easily. The foaming action is powerful and can push any unclamped bits out of alignment.

Downside is that it sets by absorbing moisture so will go off in bottle quicker than other types of glues. Its also a polyurethane based glue and you can become sensitised by skin contact. Unless parts are going to be covered or painted it's a horrible brown colour so not very good for the average foamy model.

Not as strong as epoxy but a very useful glue to have with many uses.

For a little extra you can buy larger bottles of same type of glue from Axminster Tools but check setting times as they sell a slow and quick setting types . Both foam but again it can go off in the bottle so be aware .

Thread: Petrol engine projects
30/04/2020 11:42:04

Hello Jeff . Parcel arrived and case looks good . Many thanks

Have sent PM to you.


Thread: More thinners
29/04/2020 10:55:01
Posted by Doc Marten on 28/04/2020 21:21:29:

Standard thinners and gun wash is fine for cleaning and degreasing, it's variable quality, usually low quality, reclaimed cellulose, the decent stuff is around £20 per gallon from specialist auto paint stores.

Edited By Doc Marten on 28/04/2020 21:23:54

Agree with above . Standard Thinners used to be a decent reclaimed thinners and could be used for priming. first coats etc . lately its rubbish , full of rusty water and only useful for washing and de-greasing bits. Even tetrosyl has gone down in quality . Buy the decent top coat thinners to be on the safe side .

If you want old fashioned pear drop smelling thinners then Axminster tools sell it . It brand is "Chestnut " more expensive but doesnt have the nasty Toluene and Xylene that car paint thinners has

Thread: adhesive for hinges
25/04/2020 17:00:29

Hi Tony .I Oil the pivot then wipe any excess oil off . The apply a tiny amount of Gorilla Glue in the hole and push the hinge in . Use tape to hold control surface in place and allow to set , about 20 minutes. Glue expands as it cures into the ridges on the hinges giving firm hold .Any excess can easily be picked off when fully cured.

The downside is that Gorilla Glue don't last too long once opened , up to three months if sealed properly . Gorilla glue clear is also good but doesn't expand like the normal stuff and take a bit longer to set up

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