My SMK 19 Stripped, what next!

[brettguise]

Ok so I started a topic the other day about wanting a project gun and advice. I had no idea what I was doing as a complete novice to this and did lots of research on stripping and what to do. I decided to strip it and now I'm just learning along the way and identifying the parts myself. Some advice on what to do next would be much appreciated.

So I removed the stock (simple enough )

af9dz6.jpg

Removed all the internals (the pre load on the spring was barely anything, easily done by hand but be careful), I then degreased with meths and a rag and laid the pieces out.

24zwrnn.jpg

I began polishing the internals with Wet and dry (800) and some metal cleaning solution and some fine wire wool and so far I've got them like this.

2dlu39d.jpg

Where do I go from here? Are the parts polished enough or do they need to be done a lot more. They are smooth but theirs still dirt and marks on the surface as you can kind of see in the picture. (Excuse my knowledge of parts as Im a complete novice) but what's best to do with the inside of the piston and the inside of the gun that the piston and spring fits into? Would it be best to get some wire wool on a rod and just scrape off some of the dirt and muck inside? If I understand correctly this shouldn't be polished as it leaves nothing for the grease to cling to?

As for re greasing and assembly what do I need to grease (talk simple language :P) and what grease should I use? I understand that you don't need to go overboard with the greasing if that's correct. Is it ok to drop a bit of express gun oil in the trigger block to get the internals moving ok?

The trigger unit looks rather tricky to dismantle and I can see myself getting frustrated reassembling it. Is their anything I can do to the trigger without dismantling it to make it smoother?

Thanks for looking and hopefully I can get some advice on this subject

[secretagentmole]

Molybdenum disulphide, you want that stuff!

[Tmaxxjj]

Only use the moly grease on the spring. Use a drop or two of gun oil on the piston and inside the cylinder just to lube the piston seal. Polish the parts as much as you can. As close to mirror finish as you can yet. Also, polish up the inside of the cylinder as much as you can. You can make a honing tool and whack it in a drill

[Dunkman]

The trigger unit looks rather tricky to dismantle and I can see myself getting frustrated reassembling it. Is their anything I can do to the trigger without dismantling it to make it smoother?

I have rebuilt an SMK19 and the trigger is a ******* requiring the patience of a saint to reassemble and get the springs in!!. Can be done but if you do, be prepared to be frustrated.

Re the rest of the gun, look for sharp edges on the internals and dress these down with a small file or W&D on a small stick. Re polishing, it's not that critical, just make sure the surfaces are smooth with no burrs.

Rebuild with some thick Moly (Mos2) grease.

[brettguise]

Only use the moly grease on the spring. Use a drop or two of gun oil on the piston and inside the cylinder just to lube the piston seal. Polish the parts as much as you can. As close to mirror finish as you can yet. Also, polish up the inside of the cylinder as much as you can. You can make a honing tool and whack it in a drill

What exactly does Honing mean?

Will express gun oil do for the piston and the cylinder?

[brettguise]

I have rebuilt an SMK19 and the trigger is a ******* requiring the patience of a saint to reassemble and get the springs in!!. Can be done but if you do, be prepared to be frustrated.

Re the rest of the gun, look for sharp edges on the internals and dress these down with a small file or W&D on a small stick. Re polishing, it's not that critical, just make sure the surfaces are smooth with no burrs.

Rebuild with some thick Moly (Mos2) grease.

Ok tonight im going to go over the parts again get those finished nicely then work on the burrs on the cylinder and anywhere else.

Ill leave the trigger for now haha.

You suggest to rebuild with grease, would you not use oil as well? Im still confused at the parts to target with grease / oil. The only thing I know for definite is the Spring needs greasing.

[Dunkman]

Ok tonight im going to go over the parts again get those finished nicely then work on the burrs on the cylinder and anywhere else.

Ill leave the trigger for now haha.

You suggest to rebuild with grease, would you not use oil as well? Im still confused at the parts to target with grease / oil. The only thing I know for definite is the Spring needs greasing.

From the factory they come assembled with what seems to be an oil like substance - Very light oil/grease???

DON'T use oil anywhere near the internals- It will cause dieseling (the pressure heats the air and the oil self ignites like in a diesel engine and is not what you want your gun doing). Grease should be used on all the internals taking care not to get any on on the front of the piston seal. The only place to use oil is on the trigger mechanism but use sparingly. Use grease on the barrel pivot pin and a small amount of oil on the sides of the breech end of the barrel where it rotates and oil this area periodicaly as it takes a lot of strain and is prone to wear if left unlubed.

[Ianhw77k]

I was going to say a few things, but it looks like Dunkman has beaten me to it

If you want to hone the inside of the cylinder (I would not suggest polishing in there, the grease needs somewhere to stick to!), you should either use a honing tool, like a 3 legged brake cylinder hone, or, alternatively make something yourself by cutting a 2inch slit longways down the end of a bit of broom handle and placing a strip of emery tape or wet&dry in there. Then you need to rotate the broom handle/emery inside the chamber, a drill helps here.

Also, to improve the trigger you could try some spray brake cleaner in there, leave it to evaporate then spray with some dry spray grease or some decent gun oil. Apart from stripping and polishing the sears that's probably the best you are going to do.

[highland chief]

hi mate

go to halfords i got a big tub of moly grease for £4.00. it will last a lifetime mate

cheers

gus.

[brettguise]

From the factory they come assembled with what seems to be an oil like substance - Very light oil/grease???

DON'T use oil anywhere near the internals- It will cause dieseling (the pressure heats the air and the oil self ignites like in a diesel engine and is not what you want your gun doing). Grease should be used on all the internals taking care not to get any on on the front of the piston seal. The only place to use oil is on the trigger mechanism but use sparingly. Use grease on the barrel pivot pin and a small amount of oil on the sides of the breech end of the barrel where it rotates and oil this area periodicaly as it takes a lot of strain and is prone to wear if left unlubed.

Thanks for all the advice guys. Silly question but you say a small amount of oil on the sides of the breech end of the barrel where it rotates. I don't quite understand. Is this if your putting a pellet in to the left and right where it locks in?

I need to get some break cleaner Ian, few people have recommended so ill give that a try. As for honing Ill probably leave that. Should I just degrease inside the piston and leave it then? Its black at the moment inside.

As for the Moly grease highland which one did you get? Their was a white tub with a blue lid and writing in my local. See link - http://www.halfords.com/webapp/wcs/s...egoryId_165705

I have noticed though they do http://www.halfords.com/webapp/wcs/s...egoryId_165705

Is the latter more suited?