E30 technical help

[Cloggy Saint]

https://www.google.com/search?q=glazebu ... e&ie=UTF-8

[flybynite]

Talk me through the "Glasebuster", as I`m curious please.
Mart.

Think he means honing tool

I will add I never use the bloody things as they cause more damage than they cure. Foam drum in a drill with progressively finer grades of wet and dry and plenty of machine oil is what I have always used, makes a much better job, rings bed in a treat.

[RossDavies]

By glaze buster its a 3 legged tool that you fit in a drill. Has a stone block on each leg which presses against the bore, and you rotate the drill and the stones take the oil glazing stanes off the bore, and leaves cross hatching marks to aid faster bedding of the rings, to reduce the chances of oil glazing reappearing when you run the engine. Oil glaze staining leaves the surface of the bore too smooth which is apparently bad for good sealing/ oil scraping, that's why you use a glazebuster. The cross hatching left by the glazebuster lets the oil escape from between the rings and the cylinder wall, allowing for more friction and faster bedding in. The crosshatchings need to be around 45 degrees to the cylinder to allow for correct amount of oil removal (see my picture for crosshatching). Too flat or too vertical crosshatching will result in too little or too much oil removal during the bedding in process. New rings are best bedded in at 1500 to 2000 rpm for a warming up period followed by street driving, should ideally not be left to idle. Applying load to the engine speeds up bedding in. As to glaze busters doing more damage than good? The pressure applied by the stones is adjustable, so you can get the finish you want, but different ring manufacturers can give you recommendations on finish. As you can see from pictures i went full pressure on my cylinders, to remove scratches (not recommended) but i have to say its worked wonders. Dont attempt to remove glaze from cylinders with pistons in, as the particles that come off the stones will get stuck between rings and destroy them. Also pointless doing if your not changing rings anyway.