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Falco |
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Falco Traffic Copper
Joined: 27 Nov 2015 Karma :
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Posted: 23:04 - 28 Oct 2017 Post subject: Cleaning carbon deposits Off Pistons |
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With the head off I noticed the piston heads (crowns?) were a bit mucky.
Is this a normal level of carbon build up for 30K miles?
How do I clean it off? It seemed pretty set, would a brass wire brush fitting on a drill destroy the piston head underneath?
Presumably, however it gets cleaned the engine will have to be turned over to put the piston head level with the top of the block to avoid getting bits into the bottom end?
https://preview.ibb.co/gei5o6/IMG_20171028_194555225.jpg
https://preview.ibb.co/jkHWT6/IMG_20171028_194609850.jpg
image hosting service free ____________________ I tell you what, mathematically, I'm having it |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 23:29 - 28 Oct 2017 Post subject: |
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Tooth brush and petrol/brake cleaner will shift the most of it. No harm done to leave it there though. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Falco |
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Falco Traffic Copper
Joined: 27 Nov 2015 Karma :
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Teflon-Mike |
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Teflon-Mike tl;dr
Joined: 01 Jun 2010 Karma :
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Posted: 05:50 - 29 Oct 2017 Post subject: |
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Oven Cleaner is one of the best de-carburisers known to woman-kind.... Basically, Caustic Soda.... you can still buy bags of the stuff in crystals from the super-market to mix in a bucket of hot water and soak stuff like crappy baby-grows in, that's exactly the same as they used to sell in 1l bottles with a brand name and the title "Two-Stroke Exhaust Treatment" on it, to do the same thing, for five times the price!
Oven cleaner foam, though is a bit more convenient; spray soak, scrub with a tooth-brush, rince.
It will get past the piston rings though, so plan new on oil rebuild and a short change after bed-in, like 150-200 miles on, to flush contamination...
Another tip there is to add a squib of washing up liquid to the oil just before, or even during, warming the engine before dumping the old oil.
Also worth wiping the bores with some LM grease (or a quick squib of chain lube) when you crank round to do the next two slugs, and on those slugs walls when you have done them, so that there is some decent lube on the walls come first crank and start... remember the bore is 'honed to put a slightly rough finish on it that breaks the surface tension of the oil and keeps it in the dimples. A good de-coke will take out not just the carbon deposits where there's no metal on metal rubbing, but also all the oil on the walls, and they will get rubbed before oil pressure gets up and gets them properly coated again..... This tip holds whatever solvent/redox agent/deturgent you use, BTW. ____________________ My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Falco |
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Falco Traffic Copper
Joined: 27 Nov 2015 Karma :
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Posted: 20:45 - 06 Nov 2017 Post subject: |
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In the end a toothbrush and brake cleaner made a decent job of it. Next time I am that far into the engine I'll be sure to bring back a bit of NaOH from the lab before hand. ____________________ I tell you what, mathematically, I'm having it |
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sickpup |
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sickpup Old Timer
Joined: 21 Apr 2004 Karma :
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RhynoCZ |
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RhynoCZ Super Spammer
Joined: 09 Mar 2012 Karma :
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Posted: 14:22 - 07 Nov 2017 Post subject: |
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The best way to keep your engine clean is to use it properly. Rev it up to the top every now and then. I do this with every vehicle I have/had and the combustion chambers are so clean you could eat out of them, if you don't mind the cancer. ____________________ '87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor |
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ZRX61 |
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ZRX61 Victor Meldrew
Joined: 05 Nov 2003 Karma :
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stevo as b4 |
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stevo as b4 World Chat Champion
Joined: 17 Jul 2003 Karma :
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Old Thread Alert!
The last post was made 6 years, 222 days ago. Instead of replying here, would creating a new thread be more useful? |
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