cylinder liners 750

P

Peerless

Junior member
Hi

What does it take to remove and refit cylinder liners in 750 cylinder.
At what temperature do they fall out and how do I prepare for the job?

Any suggestions?

cheers/David
 
stand cylindes on the grid of the oven, with the protruding liners lowest, shut oven door, turn thermostat up to flat out, sit in armchair and drink a cup of (Keiths) tea a wait for a loud "clang" that is when the cast alloy has dropped over the liners and is now resting on the grid, remove items from oven with heat proof gloves. Turn oven off. You are going to wish that they were spotlessly clean and free from grease and debris if you did this when the old lady was out, because if you didnt she will know it ,right enough, and for about a fortnight

You did mark the liners before you removed them didnt you? because if they are not very badly worn it is possible to get a bit more life from them by rotating the 90 degrees before refitting.

refitting is another matter, patience and care is needed, plus a bit more kit
CLEM
 
The liners read 80,04 and 80,05 and one of the has a chip out on the top where the gasket fits. Ive been thinking of welding that chip up and reshape, but on the other hand I have two liners who are 80,04 spot on and in good shape.
Hence the swopping
 
CLEMTOG said:
You did mark the liners before you removed them didnt you? because if they are not very badly worn it is possible to get a bit more life from them by rotating the 90 degrees before refitting.

refitting is another matter, patience and care is needed, plus a bit more kit
CLEM
Click to expand...

And if the gearbox is worn, fill it with saw dust!
Fuck me Clem, all that work just to cut a corner like that.

Are you Dutch?  or Scottish?  or Both?  Oooops, talk about upsetting people, I'm off  :LOL: :LOL: :LOL:

Julian
 
David,

Refitting is a lot easier than removing.  Heat up the barrel as before and drop in the cold liners.  Just need to place something heavy on top of them to prevent them from creeping upwards upon cooling.  I place the barrel assembly under the hydraulic press with a bit of pressure on  a block of wood atop the liners.

Check that the liners are at least flush or slightly recessed from the barrel/head sealing surface.  If the liners protrude, you will certainly come across oiling issues later on.

Wouldn't re-use liners from another set of barrels without boring/honing.  Bore will be all over the place, everything but straight and true, no matter how well they measure up before.

piet
 
Julian old chap (not in the least bit upset)
I would never remove and refit the liners unless I was at least going to hone them and re-ring, but preferably rebore/rehone and new pistons, Some people do tghis however and fair play to them but just like you, its not for me, i orefe the longer term fix.

Piet, when I said "refitting is another matter, patience and care is needed, plus a bit more kit" I was not only refering to the need to retain the cold liners in the hot casting to prevent "creep" but also the neccessity of retrueing the bores by either honing or honing and boring.
CLEM
 
Ok

Last winter I rebuild my 750S, I messed up and fitted new pistons in new bored/honed liners that should have had 80,06 pistons. I fitted 80,04 with heavy smoking as a result.

So, instead of spending a fortune on new pistons I thought Id go this route with a spare cylinder I have on the shelf.
Unless someone has a good secondhand set of 80,06 pistons for sale.

David
 
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