Pistons and bores

milgo · 23 Jul 2006 at 15:51

Hey there
Over the past week i have been gradually taking apart the engine to take the head off. I have only ever changed the oil etc before so this is quite a big thing for me to do. I bought the car a few weeks back now and am just giving it an overhaul for piece of mind really. Got round to actually getting it off today and i just wanted your opinions on the internals. G40's like to melt pistons and luckily it doesn't look like there is any of that going on, but there is a lot of flakey gritty stuff sitting on the cylinders, is this just carbon build up after 15 odd years? It is all loose but i just left it on for the picture.

Also wondered what you think of the bores? The pistons have no play in them and the bores look ok to me. I can quite clearly see the hone marks.

milgo · 23 Jul 2006 at 16:23

I put it up on clubpolo matt82 but it takes a while for anyone to respond

Jonny69 there is a step at the top of the bore which seems pretty even all the way round. Feels quite small, 0.02mm or less i'd say.

milgo · 23 Jul 2006 at 17:02

lol don't tempt me

I have just forked out a load of money on:
fully ported and rebuilt charger
Mocal thermo oil cooler kit
Silicone boost pipes
Chip and pulley
2 new fuel pumps
and will be getting a new manifold and exhaust when they are in stock

Will be fine for a while with that lip won't it? Maybe look at getting the bottom end done when i have some more money.

milgo · 23 Jul 2006 at 19:04

I don't think he meant flood it by sticking the unduction into a bucket

a Little water is good, helps to condense the air.
Think i will hire a steamcleaner and use that on it. Spilt coolant all over the place anyway when i pulled the head off so it could do with a tidy up.

milgo · 23 Jul 2006 at 19:46

Yeah thats just a guess running my finger on it. I'm a toolmaker (apprentice) so my fingers are pretty much as good as a DTI to be honest....heh
How would you run the dti up there? plonk it on the top of the piston and turn the crank? Don't have any better ways of doing it at home really.

Also wondering how clean does it need to be? After using emery cloth on the block surface should i make sure it is spotless inside the bores? As in blast it all out with compressed air or something? Is there anything else i can use to clean it?

Some of you might be interested to check out my photobucket album as well. Lots of pics of stuff i have cleaned up, had a go at porting parts of the throttle body and charger outlet. Here: http://s79.photobucket.com/albums/j136/milgo1/