The Old Lawnmower Club
Collection, Preservation and Display of Old Lawn Mowers
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Threads B17 Atco

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chirpy999 Tue, 13/02/2024

Hi. putting my Atco B17 deluxe back together and hhit a problem,m the front chainwheel for the cylinder is bent /worn. the chain derails when turning the cylinder. The sprocket is bent and looks like its had a hard life. So looking for a different one I see Commodore ones around. My question is would thsat be the same thread either BSF / UNF. Did they change to metric ? Dont want to waste time /money on something that wouldnt work.

 

Thanks

Forums

wristpin Tue, 13/02/2024

Possibility that someone has tried to remove it with a legged puller. You can probably true it up with some careful hammer work in the vice.  Invest in a couple of sets of thread gauges so that you can check the cylinder thread so that you know what you have.

chirpy999 Wed, 14/02/2024

So tried to straighten them in the vice with a big hammer, not sure if they will work yet, will be looking for better if anyone has any. You can tell they have had a hard life and really are only good for scrap.

wristpin Thu, 15/02/2024

Don’t give up on them, seen far worse . You can’t expect perfection on parts that are possibly fifty years old.

chirpy999 Thu, 15/02/2024

Photos

hillsider Thu, 15/02/2024

As wristpin says, I also have seen worse sprockets than that, one thing that I would advise is to set the chain tensions a little on the slack side as the chains can often have a tight spot as they rotate and normal tension needs to be ensured at this location.

chirpy999 Fri, 16/02/2024

Hillsider, I take on board your point , I know its an old machine , have some bits coming off Ebay whicjh might help. Spent an hour the other day with the mower on its side chains on and moving them round which wasnt very successful . We are not giving up , Will get there.

wristpin Sat, 17/02/2024

“Spent an hour the other day with the mower on its side chains on and moving them round which wasnt very successful . “

Not a good idea to try setting up the chains with the machine on its side as gravity will tend to make them run off the sprockets - especially if you are having to run them a bit loose to accommodate a tight spot as per Hillsider’s post. When checking for tight spots caused by “ run out” of one or more sprockets , do your checks over several rotations of the whole chain and sprocket train which will vary  when the best and worst relationship when the run out of of two ( or more) components coincide or oppose each other.