Piston ring reuse

SimonR501 said:
If you ever need new cylinder liners there are other suppliers.
I believe this company has been recommended before:

http://westwoodcylinderliners.co.uk/

Red, out of interest do you heat the barrels in an oven?
Click to expand...

no oven, takes up too much room, last time I had an oven in the workshop Jotaman was sleeping beside it in case it blew up

use a LPG Rosebud and Infrared Thermo gauge, is no issue, can control heat build up quite well and the temps we are looking at are stuff all in the metal scheme, max is 175 C
more critical part is obtaining the correct interference fit when honing for the new liners
here are some shots of the barrels I set today, honed to suit new 92mm liners, spigot depths machined, liners slotted, engine studs waisted and polished, liners now bored to 86.98mm
productive day

Linerfixture1.jpg



Linerfixture2.jpg



Liner3.jpg



Liner4.jpg
 
when a rod let go in my RGS "1200" a few years ago now, I had a heck of a time finding anyone in western Canada to tackle any of this stuff. Wolfgang put me on to Mongoose Engineering near Vancouver to fit the new Carillo rods and crank bearings, and Wolfgang supplied the one new cylinder liner I needed as the rod had taken a big chunk out of the bottom of the cylinder liner.

while it is possible to change  a bore liner at home with some heat and simple tools, the new liner did not end up exactly level with the top of the cylinder. It wasn't a big deal that it wound up sticking out above the top of the block just a fraction, as I then had to have the new liner bored out anyway to accomodate the 80.4 J & E piston that I was able to reuse, so I just had the machinist doing the overbore on the new liner also lightly "deck" the block to make it all even and flat, including the new liner. If it had wound up below the level of the top of the block though, the process of heating the block would have had to be repeated to reposition the liner.

hopefully you Aussie Laverda enthusiasts know how lucky you are to have Red available nearby for the specialized Laverda machine work and engine building, nothing like those skills and equipment available anywhere near me, unfortunately. I typically have to beg a local air cooled VW engine specialist to do my Laverda cylinder liner boring and piston clearancing to specs I have to provide.  The machine shop that was doing Laverda cylinder heads for me has refused to do any more, saying that it takes too long to properly fixture up for one Laverda cylinder head, even when I offer to pay a premium for their fixturing and services.

Paul LeClair
 
Sounds like you may have had the liner creep back up during cooling Paul, did you check the flange depth of the liner compared to the counterbore in the top of the barrel before fitting ? If the liner has crept up and you have simply machined the top off it is now essentialy floating in the cylinder block and may throw up head gasket issues in the future.



  Keith
 
Paul LeClair said:
  hopefully you Aussie Laverda enthusiasts know how lucky you are to have Red available nearby for the specialized Laverda machine work and engine building, nothing like those skills and equipment available anywhere near me, unfortunately.
Click to expand...
yes Paul,,  definitely not to be taken for granted.
now that Red is in town, i have often jumped in the 'cruiser for the short drive over to the Redax shed, and always have a smile on me face, thinking "how GOOD is this !! ".
it takes Laverda ownership into a whole new dimension, and put the capital 'L' back into Club Laverda QLD.
 
markQLD said:
Paul LeClair said:
  hopefully you Aussie Laverda enthusiasts know how lucky you are to have Red available nearby for the specialized Laverda machine work and engine building, nothing like those skills and equipment available anywhere near me, unfortunately.
Click to expand...
yes Paul,,  definitely not to be taken for granted.
now that Red is in town, i have often jumped in the 'cruiser for the short drive over to the Redax shed, and always have a smile on me face, thinking "how GOOD is this !! ".
it takes Laverda ownership into a whole new dimension, and put the capital 'L' back into Club Laverda QLD.
Click to expand...

Ay, ya dont what ya missing  ;)
 
Hey Paul,
We do know and we do not take the skills (or machinery)  for granted.
Imagine if he was a qualified mechanic as well as a fitter and turner. :D :D :D :D

Sorry just had to toss that in. :P

In all reality the Redax shed (and house) is one of my favourite places in the whole dam world. The skills, hospitality and friendship that is given freely is something that is not experienced very often.
Laverda ownership over the last 30 plus years has enabled me to meet some of the highest quality people I know.

Now back to another bourbon

Cheers
Bruce
 
So, decided after all, to go with the new oversize pistons.
Thanks everyone for your inputs.

Just ordered rings, new guides, exhaust valves and spring retainers from Richard.
This, with all the stuff so far from Ralph Allen & Malc Cox, and what I still need to get from Andy,
will be my small contribution to restoring the health of the UK economy. 

Could it be that Laverda ownership or, I guess, motorcycle ownership in general,
is a form of OCD (obsessive compulsive disorder)?    My good lady certainly thinks so.
 
laverdakeith said:
Sounds like you may have had the liner creep back up during cooling Paul, did you check the flange depth of the liner compared to the counterbore in the top of the barrel before fitting ? If the liner has crept up and you have simply machined the top off it is now essentialy floating in the cylinder block and may throw up head gasket issues in the future.

  Keith
Click to expand...

Hi Keith

it didn't float back up very much, just enough to bug me, didn't have to skim much off, no worries.... As for head gaskets, I am still using one of Clem's solid copper items, I have re annealed it three times so far, I just slap a skim of grease on both sides of it when I refit it, all has been well for a couple of thousand miles now since the fitting of the new cylinder liner and the Carillo rods, knock on wood  :o

Paul LeClair
 
Paul LeClair said:
laverdakeith said:
Sounds like you may have had the liner creep back up during cooling Paul, did you check the flange depth of the liner compared to the counterbore in the top of the barrel before fitting ? If the liner has crept up and you have simply machined the top off it is now essentialy floating in the cylinder block and may throw up head gasket issues in the future.

  Keith
Click to expand...

Hi Keith

it didn't float back up very much, just enough to bug me, didn't have to skim much off, no worries.... As for head gaskets, I am still using one of Clem's solid copper items, I have re annealed it three times so far, I just slap a skim of grease on both sides of it when I refit it, all has been well for a couple of thousand miles now since the fitting of the new cylinder liner and the Carillo rods, knock on wood  :o

Paul LeClair
Click to expand...


  Knock on wood  ;)


    Keith
 
Rather than starting a new thread, as it has to do with rings. I have two sets of rings, one set has has chrome plated top ring only and the other set has chromed top and chromed oil control.which is the best option?

                                                                                                      Dave 
 
Dave,

I checked the rings on the Mondial pistons fitted to my Jota, as well as a set of new oversize rings in the Laverda Ricambi Originale packing.    Both the top ring and the oil ring appear to have a chrome facing.

Tom
 
Grant said:
CCS.

You do need a hefty press to remove the liners even after heating them up though
Click to expand...

"The barrel was heated to around 150?C and the press was used to nudge the liners out, not force them out."

An about turn which a politician would be proud of there Grant.    :D
 
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