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Post by duffer on Jul 1, 2020 15:40:05 GMT
I have decided to tackle a problem. (No, not that one). I have an engine which came in a bin of other bits which I bunged in a frame and tested it to see if it ran and it did yippee !!....However.... on closer inspection it seems that at some point in the last 40 years it may have either had a random corrosion issue on the engine number or it was subject to a "re-distribution of wealth". After a very generous donation from Terry C (The accommodation Specialist) and an early morning run into God's own county, I am now the proud owner of an engine casing with a number. All I need to do now is to completely dismantle a reasonably good engine, the re-build it around an honest engine case... Except I have never done it before. Sooo.....my question is to the engine specialists out there is apart from a gasket set, what should I do to get ready ?
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Post by BritPete on Jul 1, 2020 15:46:04 GMT
Good luck but do you really want to do it just for an engine no?
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Post by duffer on Jul 1, 2020 16:19:24 GMT
No Pete, I want the experience. I have no real need to do it now, but it would be very handy to know how to ready for the day when I do need to.
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terryc
Forum Accommodation Specialist
I'll put you up ,plenty of room in my box
Posts: 5,307
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Post by terryc on Jul 1, 2020 17:20:20 GMT
It was good to see you Steve and quite a surprise at 6.30 in the morning, apologies for Vanya the mouthy Borzoi, on reflection I could have started the bike up and let you hear those silencers seeing as she had allready woke up half the neighbourhood .Good luck with your project hope it all works out ok for you
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Post by grahamb on Jul 1, 2020 18:28:25 GMT
I'll start .
Torque wench , gasket compound ,piston ring clamps (if you want to make life a little easier),
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Post by bojer on Jul 1, 2020 19:03:22 GMT
Perhaps worth putting in a new camchain while its apart , also replace the crank and output seals . I think I have a pattern 250 gasket set you're welcome to .
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Post by duffer on Jul 1, 2020 19:05:32 GMT
It was good to see you Steve and quite a surprise at 6.30 in the morning, apologies for Vanya the mouthy Borzoi, on reflection I could have started the bike up and let you hear those silencers seeing as she had already woke up half the neighbourhood .Good luck with your project hope it all works out ok for you Great to see you too. You were not as surprised as my neighbours when I left at 04.10 ! Had allot to do today ! Back in the office by 8.45 too. Many thanks for the messages so far on this project including PM's. I shall post pictures as I go once I have all the "Kit" ready. Seems there is a bit to read up on to make sure I pair things up correctly. Should be fun ! How hard can it be ??
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Post by buster on Jul 1, 2020 19:14:23 GMT
Agree with graham and bojer, I'd get the full set of seals for the bottom end, silvers did them as a set for my 400 (crank, gear shaft etc). give me a shout if you need some flexi gauge strip (its quite dear to buy) also I'v got a 250 engine that I'm going to break for parts (I want the gearbox and kick start shaft for my self, everything else is available if its any good)
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Post by duffer on Jul 5, 2020 10:31:07 GMT
Still gathering tools and stuff to go into battle, but I seem to remember that someone had a tip for removing the flywheel with an existing bolt from something if a proper puller is not available ? Is that true ? Also, how can you check how worn the cam chain, balance chain, oil pump chain etc are ? I know there is no substitute for new ones, but this is more an exercise than a new re-build.
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Post by grahamb on Jul 5, 2020 10:49:38 GMT
Still gathering tools and stuff to go into battle, but I seem to remember that someone had a tip for removing the flywheel with an existing bolt from something if a proper puller is not available ? Is that true ? Also, how can you check how worn the cam chain, balance chain, oil pump chain etc are ? I know there is no substitute for new ones, but this is more an exercise than a new re-build. Hi Duffer . The oil filter & cover retaining bolt is the same size as the thread on the flywheel . It has been used as a puller, but with a warning about damaging it if flywheel is on too tight. Steve did make some flywheel pullers at one time. The oil pump chain is very sloppy from new and doesn't have a hard life. I would look at how the cam chain sits on the wheel/cog on the cam shaft to see how much it has stretched. If in doubt I would replace the cam chain as it requires a nigh on full strip down to replace. On the subject of the cam chain , you will need something in the way of a thin rod or wire to tie the chain up to stop it falling back down into the tunnel in the head and barrel. Regards Graham
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Post by duffer on Jul 5, 2020 11:57:37 GMT
Brilliant. Thanks Graham. 👍😁
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Post by bojer on Jul 5, 2020 14:46:01 GMT
Agree 100% , oil pump chain is really loose even when you put a new one on , camchain worth doing while apart IMO and yes I have found the gasket set sorry , forgot about it afterwards ! Will get a pic up .
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Post by buster on Jul 5, 2020 15:06:45 GMT
I changed my balance chain (seemed false economy not to) even though there was adjustment left. but when I inspected the oil gauze pick up trumpet thingy it was peppered with gooey black crap and as I delved deeper I found the chain had been over tightened and badly worn the guide block (it had also eaten the cush rubbers in the balance weights). with all that in mind I sourced later balance weights (thanks again to graham for advice on that) with no cush rubbers, an NOS guide and a new chain. it can quickly become a costly job , rewarding though.
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Post by grahamb on Jul 5, 2020 15:53:10 GMT
I changed my balance chain (seemed false economy not to) even though there was adjustment left. but when I inspected the oil gauze pick up trumpet thingy it was peppered with gooey black crap and as I delved deeper I found the chain had been over tightened and badly worn the guide block (it had also eaten the cush rubbers in the balance weights). with all that in mind I sourced later balance weights (thanks again to graham for advice on that) with no cush rubbers, an NOS guide and a new chain. it can quickly become a costly job , rewarding though. did it look a bit like this buster.
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Post by buster on Jul 5, 2020 17:48:04 GMT
I'd say about half as bad as that one (takes some shifting as well, petrol and solvent based degreaser eventually sorted it) that looks like its had a bit of neglect in its past
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