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Apr 15, 2015 17:47:12 GMT
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looking to re ring an engine and would like some tips on diy honing /deglazing the bores
google suggest the flex hone are good but seem expensive here in the uk
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Apr 15, 2015 20:01:18 GMT
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Beg or borrow the proper deglazing tool to use on a drill, does the job quickly and easily, failing that give the bores a scuff up with some sand paper.
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786 
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Ah yes, that well known engine builder Google! Forget the balls on sticks thing. Get a proper cylinder hone tool like this;  Use the low speed range on the drill and move up and down, the full length of the bore, briskly. You are looking to recreate the original 'cross-hatch' finish like this;  Use diesel as a lubricant and keep your movements smooth and even. Do not pause or you will create horizontal ridges. This is assuming that your engine doesn't have chrome plated liners or 'Nikasil' finishing |
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Apr 16, 2015 10:42:05 GMT
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Ah yes, that well known engine builder Google! Forget the balls on sticks thing. Get a proper cylinder hone tool like this; Yep thats the one I've got, works a treat although I've only ever had the one set of stones |
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Fungus
Part of things
Posts: 960
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I managed to get a really good result with one of the tools pictured above. Again, slow speed and keep it moving. I used 10w40 oil.
The honing marks can occasionally feel a little rough, but after honing I just gave mine a single-pass with some 1500 grit (literally just wiped down inside the bores with it) and it seemed to de-burr the honing and left a perfect finish.
I'm not sure if this is an approved method but the logic makes sense to me and it worked great.
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intresting fungus - I'm refreshing a 1400 for my polo so intrested if you have any pics or info on your rebuild
have you found anything terribly worn ? mine still has alot of cross hatch from new
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Fungus
Part of things
Posts: 960
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I don't have any pics of the 1400 I built but I'll be getting plenty of the 1600.
Anything in particular you need to know?
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Apr 22, 2015 13:54:40 GMT
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Its not broken, its resting!
Max signature image height: 80px
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3point141
Yorkshire and The Humber
Posts: 106
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Remember to clean the bores afterwards... the cheapest & best product I've ever found is automatic transmission fluid applied to a clean (lint free) cloth. keep applying & wiping 'til each cloth comes away clean.
It's amazing how much dirt & grit you can extract from the bores after a re-hone.
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I was lazy and took my block along with the head to a really good engine builder local to me he checked and skimmed the head decked and honed the block and measured everything up for me all for £45.
Interested in how folks gap there rings particularly grinding methods.
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Fungus
Part of things
Posts: 960
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Interested in how folks gap there rings particularly grinding methods. I've always thought it should be done with a set of miniature files, is that not correct? End gap was how I determined if my bores were worn. Gap on the old rings was 1.1mm and the new ones were 0.3mm (as far as I remember). This to me me shows that the rings were worn and not the bores. |
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I don't really think there is a right and wrong way as long as you achieve what you set out to do Fungus,
It's just interesting to learn different views and methods especially on here as we have quit an eclectic range of car nuts over a wide age group and scattered all over the world.
I also use hand files though I know some use special hand grinders and even 4 inch angle grinder sat in a vice...
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3point141
Yorkshire and The Humber
Posts: 106
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Apr 28, 2015 11:56:26 GMT
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The only sure way of determining whether your bores are worn is to measure them... :/
Failing that, to get a "feel" for whether it really is the rings, check for any noticeable wear, showing as a lip towards the top of the bore. No lip, bore ok.
I'm sure you've done this already...
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786
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Apr 28, 2015 12:28:12 GMT
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Interested in how folks gap there rings particularly grinding methods. Always by hand, clamped firmly but gently in a vice with soft plain metal jaws. Use a fine small hand file and file in one direction only. Never with a grinder as the vibrations can cause the ring to crack. General old rule of thumb for gap is 0.003" per inch diameter of bore for water cooled engines, 0.004" per inch for air cooled, and 0.005" per inch for race engines |
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