Hellfire
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| posted on 24/10/13 at 04:59 PM |
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Cleaning piston heads
With the cylinder head off the engine and piston heads exposed, what's the best way of cleaning the heads without taking them out? Thinking of
using silicone sealant to seal the gap around the head of the piston and pulling it off once the pistons have been cleaned. Any other method without
removing the piston?
Similarly, what's the best substance & method of cleaning the area around the valves?
Phil
[Edited on 24-10-13 by Hellfire]
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carpmart
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| posted on 24/10/13 at 05:31 PM |
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Each piston in turn at TDC, cover the ones your not cleaning, can be done in pairs on a 4 cylinder engine, and an airline to blow off/ out after.
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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redturner
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| posted on 24/10/13 at 05:33 PM |
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Whatever you do, don't put silicone sealer down the bores. Piston at TDC, a thin smear of motor grease around the groove and use either a stick
of lead shaped like a chisel or a scraper made from ally. The carbon should not be hard if the engine has been running properly and normally wipes
off.....
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prawnabie
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| posted on 24/10/13 at 05:44 PM |
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A small brass wire brush in a drill has always worked for me.
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Hellfire
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| posted on 24/10/13 at 06:46 PM |
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Don't have an airline, so just wondering how to stop the dust and other stuff from getting down the side.....
Phil
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redturner
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| posted on 24/10/13 at 07:01 PM |
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Just put a thin smear of grease around the edge to fill the gap and only scrape up to about 2mm from the bore.....
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ashg
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| posted on 25/10/13 at 07:36 AM |
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Just LEAVE IT! Won't make a blind bit of difference in my experience.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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Hellfire
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| posted on 25/10/13 at 07:44 AM |
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quote:
Originally posted by ashg
Just LEAVE IT! Won't make a blind bit of difference in my experience.
Might just do that rather than risk getting any contaminants down the side of the piston. What about cleaning the cylinder head area around the
valves?
Phil
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robinj66
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| posted on 25/10/13 at 10:45 AM |
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wire brush in a drill (as per prawnabie)
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ianm67
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| posted on 25/10/13 at 10:57 AM |
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quote:
Originally posted by ashg
Just LEAVE IT! Won't make a blind bit of difference in my experience.
^^ This... ^^
Always biting off more than I can chew.....
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adithorp
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| posted on 25/10/13 at 11:49 AM |
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I was tought to not clean the piston if in situ'. The risk of getting debris down the gap between piston and bore outweighs any advantage from
cleaning.
If you must them grease around the gap and don't scrape right to it.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Hellfire
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| posted on 26/10/13 at 10:21 AM |
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Thanks guys. Looks like I'll leave the pistons alone and just clean the area around the valves with a drill and wire brush. Here's a
couple of picture of the area in question
Phil
 
Cylinder head 1
 
Cylinder Head 2
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owelly
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| posted on 26/10/13 at 01:18 PM |
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+1 for not touching the piston crown. Leave as it is and enjoy the extra compression.
http://www.ppcmag.co.uk
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