|07/09/2003 15:37:24||Paul||Now that i've found all the bits i need, i'm planning on rebuilding my engine this week. Those of you who are long term readers of these discussion pages will remember that when i removed the pistons i found that they were caked in black carbon (1-2mm thick!), which i was informed was because i used to use a petrol additive. Anyway, my question now is how do i remove it? It's baked on pretty hard - i've soaked it in engine degreasant and followed this up by attacking it with a plastic scraper, but have succeeded only in scraping the plastic. Any ideas, preferably cheap ones?|
|07/09/2003 18:02:23||Alec||Ge stuck in Paul, my preference is for a wire wheel on a drill so long as you are careful. The carbon has probably just built up over the years. Some of the cheaper petrol additives do cause a whiteish powder but yours just sounds like a general build up.|
|08/09/2003 20:12:20||Paul||Thanks Alec for your thoughts.
What is it i'm trying to be careful of? I did think about using something like you suggest (even though I don't have a drill i might be able to borrow one from somewhere), but would have thought that wire would scratch up the piston's crown - would this not be a bad thing? Is a drill necessary, or can i use a wire brush (with elbow grease)?
|09/09/2003 08:27:43||Alec||Wire brush and elbow grease would be fine. Just try not to scratch down the sides of the piston.|
|10/09/2003 16:23:36||Alistair||Is it worth using an orbital sander to minimise risk of scratching the piston sides?|
|10/09/2003 16:47:22||Richard||I use a special scrapper, but this is one of those family hand-me-downs, the options above seem OK.|