when pistons dated valves (56k warn) STUCK !! - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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Cossie

Member

Registered: 17th May 02
User status: Offline

15th Sep 08 at 11:04

Pistons seems no damage at all :

How can i remove this carbon from piston head ?

[Edited on 18-10-2008 by Cossie]

Scotty C

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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

15th Sep 08 at 11:05

Get them chemically cleaned. Cost me £10.

[Edited on 15-09-2008 by Monster]

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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15th Sep 08 at 11:06

pistons can be cleaned with scotchbrite pads and petrol.

Cossie

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Registered: 17th May 02
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15th Sep 08 at 11:09

yeah i will try with scotchbrite and petrol but monster what chemical was used and did you get the pistons out of bores to clean them or ?

Cossie

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Registered: 17th May 02
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15th Sep 08 at 11:10

also what about head and block cleaning form old gasket should i use scotch brite too ?

Cossie

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Registered: 17th May 02
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15th Sep 08 at 11:12

problem the belt sliped a teeth or 2 casue of broken bolt head from vernier pulleys got trough the belt

[Edited on 15-09-2008 by Cossie]

Dave A

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Registered: 10th Dec 03
Location: County Durham
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15th Sep 08 at 11:13

yes, scotchbrite is ideal as it doesnt remove metal, just cleans it. and any deris that comes off it is harmless to the bores/engine incase you miss some when cleaning the engine before re-assembly.

remeber to clean out the bolt holes in the block well.

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

15th Sep 08 at 11:15

quote:
Originally posted by Cossie
monster what chemical was used and did you get the pistons out of bores to clean them or ?

I have no idea mate. But yes, the pistons had to be removed and sent off. Came back like brand new though.

Cossie

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Registered: 17th May 02
User status: Offline

15th Sep 08 at 11:17

quote:
Originally posted by Monster

quote:
Originally posted by Cossie
monster what chemical was used and did you get the pistons out of bores to clean them or ?

I have no idea mate. But yes, the pistons had to be removed and sent off. Came back like brand new though.

I see but engine still in place to get out pistons is a bit of task

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

15th Sep 08 at 11:18

Yeah I can see your point, I only took mine out because I was changing the rings anyway

Cossie

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Registered: 17th May 02
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15th Sep 08 at 11:20

does the block has a water drain plug ?

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline

15th Sep 08 at 12:15

only the core plugs.

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline

15th Sep 08 at 12:15

or remove the water pump.

Cossie

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Registered: 17th May 02
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15th Sep 08 at 12:30

dave y got u2u !

Cossie

Member

Registered: 17th May 02
User status: Offline

17th Sep 08 at 08:30

update :

Everything taged :

angle valve (haha):

gasket sticked to manifold how can be removed without leaving traces on manifold

[Edited on 15-10-2008 by Cossie]

Vaux Lad

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Registered: 15th Dec 04
Location: Stoke-on-Trent
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17th Sep 08 at 15:02

Razor blade, then finish with some wet/dry and wd40

20valver

Banned

Registered: 14th Sep 08
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18th Sep 08 at 16:29

if the cylinder head is already off then take sump off then take pistons out
also you can use carb cleaner to get the carbon off piston crowns then when carbon is off piston crowns polish them up and you can use the carb cleaner to get carbon off the combustion chambers in cylinder head,
also you can polish the valve faces and valve stems with solvol

[Edited on 18-09-2008 by 20valver]

[Edited on 18-09-2008 by 20valver]

Limecat

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Registered: 25th Jun 05
Location: The Internet
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19th Sep 08 at 21:03

As 20valver says, you can polish the pistons up, I did them on my car down to 1200 wet and dry, you could see your face in the crowns. It is known as Metrology and reduces the theoretical surface area of the piston (your eyes see the reflection from millions of tiny edged shallow grooves from the w&d rather than big standard casting marks). It helps to reflect the heat back, keeps the pistons cooler.

I wouldn't bother cleaning the carbon from the exhaust ports of the head though, you actually want a layer of carbon on there rather than fresh casting.

Cossie

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Registered: 17th May 02
User status: Offline

19th Sep 08 at 22:23

i have removed carbon from piston tops ok with dome thinner and scotchbrite and remove gasket from inlet had to leave inlet in water so the gasket can soak a bit of water but it was hard to remove. will post some pic 2morrow.
Is there a way I can polish pistons top without sand paper ??

Limecat

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Registered: 25th Jun 05
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19th Sep 08 at 23:16

You do not use sand paper, you use wet and dry. The higher the number the better the result. That simple, assuming you spend the time of course.

20valver

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Registered: 14th Sep 08
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20th Sep 08 at 12:19

also when piston crowns are polished this help shows where the detonation marks are and you could if you wanted to polish the exhaust ports as well and the combustion chambers in the cylinder head

Limecat

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Registered: 25th Jun 05
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21st Sep 08 at 17:14

WTF?

Are you opting to just try to throw as many technical sounding words into your posts as possible in order to look smart or something? Why the hell would you want to polish pistons that have det marks in them, metrology is a bit OTT to be honest (only really applicable to those with a big build chasing every last fraction of a percentage, ie. not a shonky old 1.4 8v with an air box filled with bog!) and if going to that extent you sure as hell don't do it on shonky 'damaged' pistons.

You do not need to polish a piston to be able to see det marks, even Stevie Wonder could spot these after getting blind drunk.

Cossie

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Registered: 17th May 02
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21st Sep 08 at 18:57

I try to get photos maybe 2orrow as I cleaned everything pistons are shinning now and can see detonation marks as i will have to wait for some stainless steel valves !

Cossie

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Registered: 17th May 02
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22nd Sep 08 at 15:18

as promised :

Cossie

Member

Registered: 17th May 02
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7th Oct 08 at 13:29

updates work done on head for fitting larger valves !!

Dave A to supply me with valves and springs !!! comeone dave when the valves are coming please ???