How To Clean Top Of Block/pistons On A 3k?

[Tally]

Hey guys

 

I have taken the head off my 3K in my KE25 and have been told that I should clean the top of the pistons while the head is off....

 

My question is how and what do I use?

 

Cheers

Tally

[Clapped out]

Hey there fella,

 

cleaning the top of the block? :jamie: i usually just buy that spray on gasket remover and after that has done its job i wipe the top face of the block with metho to dry up all the crap, then bolt the head straight on, if you use metho don't leave it overnight or it'll rust the surface.............not good.

 

And as for the tops of the pistons, don't use a scraper or sand it as it will score the tops of the pistons and in cases can alter compression, remove them from the block and let them soak face down in kerosine for a week,

 

If anyone has a better solution feel free to correct me,

 

cheers phatke30!

[camerondownunder88]

phatke30 not to 100% disagree with you..BUT

 

One engine I did pull the head off of I used a scraper to remove the big deposits of build up. I find it hard to believe you would alter the compression enough to make it noticeable with a scraper and a scratch you might put in the piston. But use a plastic scraper never a metal scraper. Also don't sand it I agree here but on a different note. If you left dust there etc well could stuff the bore up if not cleaned out properly I feel.

 

As just to back up my "a scratch wont alter your compression much case" once my 4K dropped a valve on the highway. The valve dinted top of piston in the cylinder. The dint was on the edge small mark was also put on the bore. Now I grabbed an old used valve put it in the 4K head no damage to the head. Got lapping compound and a drill and made the valve seat like new. This cylinder when engine was running again was down about 5psi and I mean a dint in the piston edge was a big one to.

NOW

 

Last week I ripped this motor apart after racking up many more KM on it as this motor was in my work car. I found yes blow by near the dint but not much. Also when I sat this piston in the acid bath at work top of it was HEAVILY pitted from just normal life so were all the others. So in short I don't think a scratch will do damage and pistons get a lot of pitting and small holes in them over normal operating life so I think a scraper is a safe carbon removal tool.

 

Cheers

Cameron

 

P.S. I know phatke30 said in some cases a scratch can alter CR. eg F1 cars they might worry about scratches but for a daily car I doubt it. As you will see some pitting when you clean them up and notice what I mean

Edited December 5, 2007 by camerondownunder88

[Medicine_Man]

Hit it with carby cleaner..

[harun]

If you are worried about scratching the surface of the pistons you could try SIFA Steelwool Grade 0000.For Fine finishing of metals.Basically its used to polish up metals however with a bit of elbow grease you could get those big deposit build ups aswell.

 

http://www.sifa.com.au/products.html

 

 

You could also try a steam gun.

Edited December 5, 2007 by harun

[Tally]

Thanks guys!!! great help..

 

Here are some pics of the head and block...

 

I am pretty sure the head is cracked so thats why I'm looking for another one at the moment...

And the water ways have corodded a fair bit so its not usable.

 

The oil has water in it also...

And the last piston has a fair bit of oil on it...

 

[Felix]

Sorry to say, but I think you need a new motor... Either that or time for a rebuild.

 

With all that oil in number 4, it looks like the rings are gone in that cylinder. It is pretty common for number 4 to go first, especially if the motor has been run without a thermostat for some time.

[Tally]

Sorry to say, but I think you need a new motor... Either that or time for a rebuild.

 

With all that oil in number 4, it looks like the rings are gone in that cylinder. It is pretty common for number 4 to go first, especially if the motor has been run without a thermostat for some time.

I think your very right. :bash: :no2: :sob:

 

few cars just popped up in the car trader hehehe :( :D

[Clapped out]

felix is on the ball dude, looks like a freshen up is needed! And for cameron, I'm not a retard Dickhead! i should have made it more clear when i said "alter compression", some people might not have a mind and rip the pistons out and keep sanding til they take a mm or so off each piston, and yes you are right, it only alters slightly, this topic can go on for years, at the end of the day it comes down to what people have at their disposal and their choice of cleaning methods, and only idiots build "slap together motors" for their daily, unreliable!

Edited December 6, 2007 by phatke30

[pozman]

if you were worried about loosing comp becuase of scratches it would be probably be best to leave the buiold up on it to keep the higher comp

 

but the filth may be effecting the burn

[trd]

if you want the engine to burn oil after you've fixed it, then by all means clean the pistons. :D its a well know fact that if you do a head gasket, do what ever you like to the head but unless your going to put rings in it, DON'T touch the pistons!! :(

[oh what a nissan feeling!]

A bit of petrol/ kero or whatever, and a wire brush is the go.

 

It might sound harsh but will do way less damage than any sandpaper would.

[Guest Sbox]

Deleted

Edited May 24, 2008 by Sbox

[camerondownunder88]

Sbox those scotch discs are magic. I can recommend investing in a set of them.

 

Also the oil is suggesting a rebuild. But K motors seem to be everywhere up north but if possible as you said trading post a cheap KE set. And at scrap metal it is $2 a KG for Aluminum and with your ABN if you have got one you get a tad more so go scrap the 3K and invest in another one.

 

Cam

[Tally]

Sbox those scotch discs are magic. I can recommend investing in a set of them.

 

Also the oil is suggesting a rebuild. But K motors seem to be everywhere up north but if possible as you said trading post a cheap KE set. And at scrap metal it is $2 a KG for Aluminum and with your ABN if you have got one you get a tad more so go scrap the 3K and invest in another one.

 

Cam

will do...

 

Thanks for the help guys, appreciate it!!!

 

Cheers

Tally