tegwin
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| posted on 22/3/10 at 03:18 PM |
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Deglazing bores?
I am just about to start re-assembling my engine..
Do I need to do anything to the bores before I install the pistons with new rings?
Likewise do I need to do anything to the bearing shells before I install them?
I really have no idea what I am doing... so I am just making this up as I go along 
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turbodisplay
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| posted on 22/3/10 at 03:35 PM |
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You need to hone the block. This will make the rings wear into the bore to result in a good seal.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Irony
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| posted on 22/3/10 at 03:43 PM |
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I know nothing as well! But I am in the process of doing the same thing. For honing/glaze busting you can either take it to a engineering firm. I
did this and got a quote of £10 a bore. For my V8 thats a lot.
Or you can buy a honing tool from somewhere and try to do it yourself. I have been told thats its quite easy to do but I would think theres a high
percentage you might bodge it up.
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snakebelly
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| posted on 22/3/10 at 04:03 PM |
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do it yourself, its actually very easy, the tool doesnt have to cost a fortune, just take it easy, plenty of lube and stop as soon as you get a
reasonable cross hatch effect, all your doing is taking the least material possible off the surafce to give the rings something to key against.
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owelly
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| posted on 22/3/10 at 04:03 PM |
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If it's just a case of glaze-busting to help bed new rings in then you can do it with some wet and dry dipped in engine oil. If you need to
rub-out some marks in the bores, then use a set of honing stones/balls in the leccy drill.
http://www.ppcmag.co.uk
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cliftyhanger
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| posted on 22/3/10 at 04:45 PM |
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I have used two types, the "pea-sized abrasive balls on bits of nylon and looks like a loo bruch" sykes type, and the oversized
flapwheel. Both did the job (several times, but only once per engine ) and had no problems at all. Just used them in a dril on slow speed, wd40 as a
lubricant, up and down the bores a few times until a slight matt finish.
I have done one by hand, using 240grit stuff but that was a faff. For a fiver you can by a suitable flapwheel I am sure. Just don not overdo it
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britishtrident
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| posted on 22/3/10 at 05:43 PM |
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You actually need to get the bore surface quite rough, if doing by hand I usually start with 240 grade to clean the bore then 180 to roughen the
surface so it retains oil better, then a very quick rub with 240 just to take in excess roughness off.
The other thing to try and remove is the wear ridge at the top of the bore which can batter the new top ring every time it comes up to the top of the
bore.
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