7 replies to this topic

[The-Womble]

Evening,

 

I've just bought a second hand 998cc engine for my current project. Thought it best to pull the head off just to check everything is in order, only to find that it's obviously been stored with only 3 plugs in and a small amount of surface rust has emerged on the inside of the bore.

 

http://i.imgur.com/zohufzT.jpg

 

http://i.imgur.com/O6nf3pc.jpg

 

How would you go about removing that? I assume it will ruin the rings trying to turn that over.

 

Is it worth trying a de-glazer, or drill-mounted honer, or is it a machine shop job?

 

Cheers!

[carbon]

I would use this as is, looks to me like very light surface rust..

 

Move piston to bottom of bore, and smear a thick ring of grease around the top of the piston. Get a new stainless steel pan scrubber from your local supermarket and with a bit of gentle elbow grease this should clean up nicely.

 

Don't use emery or sandpaper, if it gets between piston and bore it will ruin the engine in short order.

 

And check top of the bores for any lip about 10mm down from top of bore.

[The-Womble]

Thanks Carbon, that's encouraging. If I run my nail over a few of the spots of rust, there is a slight bump, but I will try with a pan scrubber.

 

I assume the grease is to stop any rust getting down the side of the piston, and should be wiped away after?

 

I did check for a lip at the top of the bore too...surprisingly non-existant!

 

Cheers

[carbon]

Yes, the grease is to stop any of the rust getting between piston and bore, wipe away afterwards.

 

With the pan scrubber get the ones which are from continuous spiral of stainless steel, reason for using these is so you don't get any small pieces of wire dropping off into the engine which in my experience is a problem with wire wool...

[Spider]

but I will try with a pan scrubber.

 

Some 'pan scrubbers', like the Scotchbrite type, have Carborundum impregnated in to them. Do Not use one of those.

 

I'd just take to it with WD40 or the like and some paper towel, it won't get it all off, but it's only light and it won't do any damage.

[The-Womble]

Thanks guys, I'll give this a shot over the weekend. I was wary of using wire wool for the very reason. There already looks to be a fair bit of crud in the bores at the minute as it is!

 

I did try with some blue roll and WD40 but it was a little too caked on for that.

[ANON]

get some acid on a cloth, wipe it over then quick wipe over with some oil.

[The-Womble]

I would use this as is, looks to me like very light surface rust..

 

Move piston to bottom of bore, and smear a thick ring of grease around the top of the piston. Get a new stainless steel pan scrubber from your local supermarket and with a bit of gentle elbow grease this should clean up nicely.

 

Don't use emery or sandpaper, if it gets between piston and bore it will ruin the engine in short order.

 

And check top of the bores for any lip about 10mm down from top of bore.

 

This worked a treat! Smooth as a baby's bum now  

 

Cheers guys