Non BSA but for advice

[Mike Farmer]

 

Hi All. This is not BSA but it could have BSA implications, tho in truth I am looking for inspiration and advice.

The situation is thus. I have a 1943 Farnall Tractor engine that I rebuilt several years ago. Then sold the tractor. The buyer died and said machine was left standing out with no cover on the upright exhaust pipe. So a cylinder got filled with water and the piston rusted in etc.

Have freed the piston and stripped engine which is dry lined. The place in the bore were the piston was rusted in became badly pitted as a result. The piston is not too clever but can be carefully cleaned and reused. Almost all of this model was modified by fitting a lager bore liner. This one isnt modded and no original liners available. The Mod is 1/16 larger The cost of replacing all 4 liners etc is relatively prohibitive.

Now I have thoughts of "repairing" the cylinder wall with the liner in situ. In other words filling the pitting. My thinking has gone down the routes from Something like JB-weld to silver solder. In truth I believe it only needs something to diminish the risk of the pitting breaking the rings.

The pitting is probably too deep to rebore and new pistons are not available. So gents how about coming to the aid of an oldish man and donning your thinking caps.

Again apologies for using the site for this. but I know a lot of us have had similar problems.

Mike

[TTJOHN]

Mike.
I think your best bet is to get in touch with Rob Smithdale at the Norfolk branch, he is  an agricultural engineer and has experience with this sort of thing. HTH

Regards TTJohn

[chaz]

one place to ask is Westwood Liners in Droitwich, Ive been there and they have a lot of liners available for classics and moderns.
having them "on the shelf" could mean cheaper prices.

https://westwoodcylinderliners.co.uk/

[Mike Farmer]

 . is 

Hi Thanks for your replies.

I am upsides with the problem and the normal answer is destruction of the existing liner and a refit. I was hoping to avoid that if possible.

The professional answer is if the pitting is below the point to which the compression rings descend. Hone it and ignore it. If not then A. Take a chance on honing , or B.new liner. So basically where I was anyway.

Mike

[DerekAnderson8]

Morning Mike, would welding not be an option or brazing? im assuming they arent cast of course

  derek

[chaz]

is there an option to find a local (or national) expert on rebores.
may be able to come up with another option of piston to use, I would suggest one but .....I will leave for another day...

[Mike Farmer]

 

Thanks again

Derek.They are cast pistons. I dont mind welding cast but the position would render it imposible to "crack check" the weld.

 Chaz. I'm currently discussing this with the Co you suggested the other day. The thought at the moment is to make a liner to fit the existing piston. That would be £145 plus VAT. So now at least we have a direction of travel

Mike 

[chaz]

Mike
my old machinist had a reference /experience with rebores.
the old mini pistons in square four motors was a conversion done and knew what to machine to get to use.
alas, these skills are fading away.

[John Dynostar]

not sure if this helps
The internation 634 tractor was a dry liner engine , I have done a couple of them in my time
back in my apprenticeship days
you can manufacture a draw tool to extract the liner
ours was a big spanner and a long piece of threaded rod and two big nuts
a large dia tube on to top of the engine block with a cross bar with a hole drilled.
and an insert that fitted the liner exactly  at the bottom.
refitting was a hammer and a block of wood
that was a few years ago now 
wet liners were a lot easier to do 

I'm guessing, now we are 100 years on, the liner  may be slightly attached to the parent metal
of the block and this may no longer be an option   

[Mike Farmer]

 

Yes that 634 engine is typical IH, Dry liners have some very good points but changing liners aint one of them. Of course IH argued that by changing liners A. you never took any metal out of the basic engine block an B.you can do it with the engine still in the frame, which of course you can with something thats been running all day every day. Sadly not the situation with this dear rusty old gal. Thanks for info already have a puller.

Mike

[John Dynostar]

ok so another idea
Motorcycle boring bar
vidlink to illustrate  https://youtu.be/CNBsd-iCJvo?si=YH7e6xANesNFzRZY
 this could be mounted on the block head bolts possibly using an adaptor plate
I have seen some where they do bigger verions for cars.  if they could be modified or
adapted it would solve the problem possibly
I think the Van norman boring bar max is 5.5inch.
what bore is the farmall :-)

[Mike Farmer]

 

Thanks for that 3.375 inches. But I think we are now upsides with the problem A cou[le of companies THINK they'll be able to produce a new liner bored to fit used piston. So Fingers crossed.

I'll keepyou in the loop.

Mike

[BILL NELSON]

Sorry, I'm very late to the subject, but this may help someone else.
I have a spare B25 cylinder that was relined with one of this company's liners & had a few others off them when I was at the steam turbine company - various control valves & dead diesel gennies were revived by & with them. Nothing was too much trouble for them when dealing with our Engineers:
https://westwoodcylinderliners.co.uk