Technical rusty cylinder ??

[arc]

Got me an extension bar and got the head off the 1242 today. I know this engine hasnt run for around a year. When i got it, it was missing a plug in no3. Thought nowt of it.

Now, with the head off - looks like water has leaked into no3. Its all icky. And theres loads of **** in the bottom of it.

Wasn't expecting this, dunno what to do about it - can i clean it off - or does it need to be machined flat again?

few pics:

 

[dave]

looks more than surface rust, chuck it away and start again

 

[Hellcat]

Those dark patches look particularly bad. I wouldn't risk it. Especially if its going to be a turbo jobbie.

 

[arc]

i can't afford to do that. why **** can't something just go right for once

 

[HP]

You could try stripping it and having the bores honed - an engine rebuilders machine shop should be able to do it for you.

 

[arc]

money i wasn't looking at spending.

i bought it as a working engine

 

[RS Pilot]

If you're going to turbocharge this engine, then you're better off fitting lower compression pistons. Just buy oversize ones and get the block rebored (or can't you get the pistons?)

 

[arc]

can't afford to do that, wasn't planning on turbo'ing this till summer. IF i ever did turbo it. n/a 1242 was gonna be fine for now.

 

[project-cinqy]

buy a cylinder hone, and have a go yourself. they're only bout £30 i think, attach it to a drill and go for it, theres plenty of info on the net on exactly how to do it. if it's pitted once you've honed then you know it's screwed. as for the piston, get a new one, or an identical sized second hand one.

I've seen bike barrels that look a lot worse than that, and with a quick hone it comes off, don't write it off till you're sure. If in doubt, once honed, take it somewhere to get the bore measured, and then order a piston. not much more expense, but thats often how rebuilds go, it looks ok till you open it up. If thats the only problem you find consider yourself very lucky!!!!!!

Infact i would be more worried about how black the other cylinder is? did you compression test it before you stripped it? The head on the right looks a healthy colour, but the left looks like it's been filled with oil, and the piston looks very crusty.

Jon+Em

 

[arc]

plan was get the head checked, skimmed, ported, and polished.

like i say, i wasnt expecting this. I was sold a working engine.

no4 does look bit oily, yeah. HG looks fine though. tbh, i didnt want to start taking the bottom end to bits. I was going to pull my 1108 to bits to learn about them once i'd got this engine fitted.

i'm taking it to machine shop tomorrow, see what they think. If its gonna cost a lot to clean up properly, i'll just be swapping the engine for my money back methinks.

 

[project-cinqy]

take the barrels off before you take it, then they can see the whole cylinder not just the top (plus it's a poo-load lighter!). get no4 piston checked, if the head gasket was fine that usually means the rings are suspect. if they are you need to replce them.

Jon+Em

 

[arc]

see, this is why i wasnt strippng the bottom end. barrels?

 

[project-cinqy]

hmm crap, I forgot the barrels are cast into the top half of the engine block aren't they. For a machine shop to hone them, you will have to strip the bottom end I'm affraid. This is because the pistons take up a small amount of the cylinder and it needs to be honed equally all the way down.

Jon+Em

 

[arc]

it's scary in there though

will wait and see what engine places says about the rust tomorrow.

 

[project-cinqy]

if not, i'm sure there someone on here who could do it for you? Perhaps for parts and beer?

Or some other arrangement

Jon+Em

 

[JonnyBoy]

That looks very badly pitted perhaps you could get it bored out to remove the bad metal, but that would be expensive as you'd need bigger pistons too.

Personally, I'd get a refund sorted and buy another.

 

[project-cinqy]

or a quick rummage round a scrappy for a new barrel and the pistons to match?

Jon+Em

 

[arc]

or a quick rummage round a scrappy for a new barrel and the pistons to match?

Jon+Em

didnt we just deciede they were cast into the block?

few more photos

 

[arc]

cleaned some of the crap off with a brush, and got rid of some of the ****

also took a photo of my workshop, hehe

 

[custard]

your wardrobe doors look like an ass