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  #1   IP: 174.66.178.177
Old 07-30-2020, 02:22 AM
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jpian0923 jpian0923 is offline
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Cylinder Re-Sleeving

How is this done on an A4? I've watched several YouTube videos on removal and replacement for other engines and all of them are done through the top of the block. I don't see how this can be done on an A4. Anybody?

Cylinders 3 and 4 have damaged bores.
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  #2   IP: 108.185.228.107
Old 07-30-2020, 05:35 AM
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Can’t be done in situ. You’d have to remove the head and take the block to a sleeve company to get it done...at least as far as my knowledge goes and I’m still learning
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Old 07-30-2020, 07:10 AM
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Doesn't re-sleeving imply there were sleeves in the first place?
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  #4   IP: 155.186.124.219
Old 07-30-2020, 08:51 AM
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The existing sleeve or "cylinder bore" of the block is "bored out" and the sleeve is pressed into place. Then the sleeve becomes the new cylinder bore. If it is a sleeved block (rare) the sleeve is bored out and another pressed in place.

Be sure the rest of the blocks integrity is good enough to last as long as the new sleeves, a judgement call.

Why do you think the A-4 can't be done from the top?

Dave Neptune
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Old 07-30-2020, 09:09 AM
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Quote:
Originally Posted by Dave Neptune View Post
The existing sleeve or "cylinder bore" of the block is "bored out" and the sleeve is pressed into place. Then the sleeve becomes the new cylinder bore. If it is a sleeved block (rare) the sleeve is bored out and another pressed in place.

Be sure the rest of the blocks integrity is good enough to last as long as the new sleeves, a judgement call.

Why do you think the A-4 can't be done from the top?

Dave Neptune
Wouldn't you need a lot of space to bore out an A4 in place? Many of them are pretty close fits.
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  #6   IP: 155.186.124.219
Old 07-30-2020, 09:22 AM
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If you had the room above the engine it could be done in place. If "sleeving" is in order removing a small engine like the A-4 would be worth while. Having the sleeving done in a shop will yield a better job than on site as locating the true centerline would be much easier to set up properly. Sleeving on site is usually done on larger engines where removing would be a bigger job than setting up on site.
Most A4's can be stripped down in the boat and then be removed as a much lighter engine. Trying to get set up on a small boat could be more work that the R&R itself. Again a financial judgement decision.

Dave Neptune
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