Abit cheesed off lads. I was honing the cylinders , all going really well and on the third cylinder I was unbalanced and slipped finger off the drill
trigger and ended up pulling the hone out right at the end when it was not turning.
Caused a very feint vertical scratch 1 inch. I honed 30 seconds more and smoothed it abit but you can just feel it with the nail.
When you run the palm of the finger you cannot feel it.
Only a small setup 1.4 litre, around 150bhp. I can't be overboring it as I have purchased the new rods n pistons.
The cross cross pattern is now etched pretty good on the cylinders.
I didn't fancing honing it abit more because it's a engine rebuild and the tollarences were quite tight although acceptable for a rebuild.
p.s I am not 100% sure if the scratch was there in the first place.
Give it a good clean to remove all hone grit and look again
Take a photo and post
I honed/de-glazed at home a bore that had vertical groove, turned out ok compression was good when built up
In a sense if you can't rebore, your stuck with either taking a chance or going further with the hone.
If you build it up now and find you need to hone more it's just a set of rings
quote:
Originally posted by snapper
Give it a good clean to remove all hone grit and look again
Take a photo and post
I honed/de-glazed at home a bore that had vertical groove, turned out ok compression was good when built up
In a sense if you can't rebore, your stuck with either taking a chance or going further with the hone.
If you build it up now and find you need to hone more it's just a set of rings
the main scratch looks too straight to me to be caused by removing a tool by hand. I also noticed some other minor scratches parallel.
what was the reason for rebuilding then engine?
quote:
Originally posted by gremlin1234
the main scratch looks too straight to me to be caused by removing a tool by hand. I also noticed some other minor scratches parallel.
what was the reason for rebuilding then engine?
can you run the honing tool 'anticlockwise' ?
also for sanding, what paper would you use? I am sure I have seen something saying don't use emery, unless the block is going to be washed
quote:
Originally posted by gremlin1234
can you run the honing tool 'anticlockwise' ?
also for sanding, what paper would you use? I am sure I have seen something saying don't use emery, unless the block is going to be washed
Many years ago , at least 45 I did a head gasket on a Fiat 600 . On removing the head I found all four cylinders had what looked like a vertical groove machined in the bores , further investigation found all of the Pistons were missing one circlip and the gudgeon pin had scored a deep groove. Other than the overheating caused by the head gasket failure the engine ran like a sewing machine so new circlip song, rings and big end bearings were replaced with no ill effects. That scratch, although not ideal is unlikely to cause any problems. It may well have been cause by a broken ring?
quote:difficult to describe, but I shall try: it would reverse the leading and trailing edges of the grove, so the edges would wear differently as it is honed.
Anticlockwise yeah I can, why what would that do mate?
quote:
Originally posted by gremlin1234
quote:difficult to describe, but I shall try: it would reverse the leading and trailing edges of the grove, so the edges would wear differently as it is honed.
Anticlockwise yeah I can, why what would that do mate?
Perhaps drill rotation too quick, I used a variable speed drill on slow.
Scratch looks very mild, I would not worry.
Here is my at home cleaning tip...
Wash out with thinners and rags until rags do not show signs of dark stone and metal grains then use a cloths lint roller, you will be surprised how
much it will pick up, you will use several sheets per bore, I used two complete rolls for four bores.
You will get to a stage when the lint roller sheet is almost clean but persivere until the lint roller sheet sticks to the bore, remove it and give a
further wash with thinners.
Job done
that scratch is not going to make any noticeable difference.
honing is not correct - try running at much lower speed and move tool up and down; aim to get diamond type marks like here:
I wonder if it's the WD40 because compared to my picture yours looks deeper scratch pattern. Mines super smooth.
Wonder if there should be less lubrication to get a deeper scratch. I'll try it at a lower speed.
I managed to get a deeper angle lads. Thanks for the help. I reduced the speed on drill.
I put quite abit of WD40 so it looks alot smoother than the picture above which looks like a more abrasive scratches.
I don't feel like having a another go at it. lol
[Edited on 1/4/17 by bikecarbfred]
[Edited on 1/4/17 by bikecarbfred]
Does the honing scratches have to be deepish i.e feel the scratch,
I used the 240 grit flexhone and have put the pattern in but they don't seem deep when compare d to some of the images on google where the
scratches seem so bright when you get a light on them.
I went up and down for about a 30 seconds or was it a minute lol on each one