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Poorly OS40 repair

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Jon - Laser Engines17/02/2020 19:00:24
5181 forum posts
236 photos

Very kind Malcolm

My plan is to do as little to the engine as i can in terms of replacement parts. I mean, its not really fixing it if i replace all the parts, but equally if something is beyond repair then it needs to be changed. Bearings, piston ring, valve springs. These are my main worries and i know the throttle arm is also broken. Beyond that i have not looked at it closely as i didnt want to start the video already knowing the story.

What i will do is try and get myself organised and see what it is we have, are the parts any good, can it be saved. If i can get a video of that lot done then i will see where we end up

Wingman18/02/2020 10:12:36
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1130 forum posts
405 photos

Jon,

While a video would be great can I suggest that in order not to get trapped in it that you video yourself doing all the repairs/refurbs until complete and you have a running motor and then upload it after editing. That way the thread won't stall because you can't get a part or have insufficient time available to do the job etc. etc. and you will be a

herolaugh

Jon - Laser Engines18/02/2020 11:08:25
5181 forum posts
236 photos
Posted by Wingman on 18/02/2020 10:12:36:

Jon,

While a video would be great can I suggest that in order not to get trapped in it that you video yourself doing all the repairs/refurbs until complete and you have a running motor and then upload it after editing. That way the thread won't stall because you can't get a part or have insufficient time available to do the job etc. etc. and you will be a

herolaugh

I did think about that but i would like to stay away from the 'here's one i prepared earlier' style. If someone is watching the video and trying to learn something about fixing an engine then the video needs to be as they will see it themselves and will be, more or less, completely unedited. If i have all the answers before i begin then i can miss things in the video that i take for granted when looking at a damaged engine.

I dont want to go in with the whole project figured out and a script of what needs to be done as this is not representative of trying to fix an engine yourself. You open the thing up and you evaluate it, that will be the focus of the first instalment. If during that process we learn that the engine is dead, then fine, its dead, but at least we all now know what to look for in a dead engine, how to evaluate the parts you have, and when to decided its done and not go spending loads of money on replacement parts.

At the end of the whole thing the engine might still be a failure. It might not run very well, compression might be poor, whatever. That is not really the point.

Its like in a maths test at school. If you got the answer wrong but showed your working you still get most of the marks.

Cuban818/02/2020 11:27:45
2860 forum posts
1 photos

Not a mullered engine - but a good video showing four stroke assembly here. OS FS Rebuild

Jon - Laser Engines19/02/2020 23:13:06
5181 forum posts
236 photos

i had a brief go at getting the video started this evening and immediately came to the realisation that i did not have the equipment or setup to really make it work. I am going to try again in a few other locations but i am not holding out too much hope. The real issues are lighting and camera mounting as i dont have any tripods or anything like that. Looking through the camera it was impossible to see anything inside the engine as the light was so poor and trying to use a torch (all i had to hand) just washed out the image.

I will try again in the workshop at work as the light is much better than my living room but i am still stuck on ways to hold the camera. If i cant work it out then a step by step blog might have to do.

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