oadamo
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| posted on 20/5/07 at 05:23 PM |
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zetec engine bores
hi its me again lol
ive just taken the head off my zetec engine and theres a lip about 8mm from the top of the bores down. about 1/2mm as the block had it or do you think
its useable
thanks adam
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ecosse
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| posted on 20/5/07 at 05:24 PM |
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Its probably just carbon build up, nothing to worry about.
Are the bores clean up to that point, can you see any cross hatching?
Cheers
Alex
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oadamo
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| posted on 20/5/07 at 05:30 PM |
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ive just had a good look and they look very clean but its deffo a metal lip
adam
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jambojeef
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| posted on 20/5/07 at 05:32 PM |
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Adam,
If its a 1.8 Zetec - ive got a bare block and head you can have if its of any use?
Geoff
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oadamo
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| posted on 20/5/07 at 05:35 PM |
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quote:
Originally posted by jambojeef
Adam,
If its a 1.8 Zetec - ive got a bare block and head you can have if its of any use?
Geoff
thanks for the offer but its a 2L ive been thinking iam gonna use it anyway to get it up and running then change it later with a fully rebuilt engine
adam
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jambojeef
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| posted on 20/5/07 at 05:40 PM |
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Okey doke, I thought for one sweet moment there Id got rid of the damn thing!!
Maybe just stick some oversized rings in and hone the bores then?
Shouldnt take much longer than a day at most I would have thought - have never done it on a zetec though.
Geoff
[Edited on 20/5/07 by jambojeef]
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ecosse
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| posted on 20/5/07 at 06:11 PM |
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quote:
Originally posted by oadamo
ive just had a good look and they look very clean but its deffo a metal lip
adam
Strange, Zetecs are usually pretty good for bore wear, but if it is worn that much probably best not used.
Cheers
Alex
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big_wasa
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| posted on 20/5/07 at 06:46 PM |
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Would very much doubt its 1/2 a mill mate.
As said it would be odd for a zetec. Unless its been to the moon and back twice 
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flak monkey
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| posted on 20/5/07 at 07:02 PM |
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You can feel a very small lip with your fingers/nails. You only need 0.01mm to be a clearly distinguishable step. And you can feel much less than that
too.
The only way to find out how much bore wear there is, is to borrow an internal micrometer and measure the bores in several places.
My pinto had all of 0.005mm taper on the bores, but you can still feel this with a finger nail.
0.5mm is a huge amount. If there really is that much bore wear then the whole bottom end is likely to be knackered.
Like I said you need to get a mic to measure it, looks/feel can be decieving, and some of the 'lip' will just be carbon.
David
[Edited on 20/5/07 by flak monkey]
Sera
http://www.motosera.com
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Mal
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| posted on 20/5/07 at 08:21 PM |
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Small Bore Step
My Zetec engine had a small lip at the top of the bores. I took it to an engine machine shop and they honed the bores.
The wear area did not fully dissapear, but I fitted a new set of standard size piston rings and it performs fine.
Mal
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takumi
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| posted on 20/5/07 at 08:44 PM |
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The problem comes when you fit new pistons rings used in a very worn bore, and the new rings smash into the ridge and can shatter..
RobinHood 2B 2.0i pinto, Keihin 38mm Carbs, lightened flywheel, O'Mori remote filter kit, 10 row oil cooler. Modified head, 10.2cr, special
valves FR22 cam, 4- 1 header.
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