SOHC.co.uk Forums > CB350/400

Replace a cylinder sleeve / liner.

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Erwin83:
I decided to pick up my old engine and see if it is at all suitable to rebuild.
I found a little surprise in cylinder 4.
Now I have another old 350 cylinder block on the shelve, also with damaged cylinder due to a piston failure.

Is it possible to replace a liner?
If so, how?

Trigger:
That's is not too bad, ask a re borer to bore it to 0.50 and see if it will clean up  ;)

Erwin83:
I don't think that will work. There are some deep pits (i brushed it off in the meantime).

Plus: that will mean 4 bores, 4 pistons, 4 sets of rings

Whereas if i replace the sleeve, i can fit 1 other standard size piston and just do the rings.

Matter of cost vs benefit...

Erwin83:
BTW. This was a good running engine, I just replaced it because of oil leaks, and over a decade ago, 400/4 engines were available for less than the price of a gasket kit....

the-chauffeur:
To get the liners out, stick the barrel assembly in the oven.  The aluminium block expands at a faster rate than the liners, so once the oven's hot enough, the liners will fall out.  If you stand the assembly right way up (like it would sit in the engine) gravity will help pull the outer block down; you'll hear a thump when it goes.  Can't remember what the "right" temp is, but it's not all that high - 200 deg C or something similar should get you started.

Usual caveats apply: make sure there's nothing rubber left in/on the assembly - like the rubber rings that hide around the liners under the block (or the fin spacer plugs on the '750s) - and if you're doing it in the house, clean the whole thing thoroughly before you start.  Even then, it's probably going to get a bit smokey . . .

Refitting is basically the same process in reverse, but when you do it, put the assembly upside down so the block falls onto the liners as they heat up.  And if you're swapping liners between blocks, don't forget to check they seat properly and the top faces are completely flush.  You may need to skim the deck depending on how closely matched the liners are.  I tend to use the sandpaper-on-glass/MDF technique for that.

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