barf Posted August 18, 2010 Share Posted August 18, 2010 i lost compression in a cylinder because of loose coke interfering with the valve seat, whats a good/safe solvent to use on, or way to clean an alloy head to remove coking? basic question i know but, first rebuild here, she was burning a lot of oil before the rebuild. already had the acid dip and leak down test was OK but there was still lots of gunk on top of the valve when i got it back from the head shop. turning the engine over was enough to loosen it off when the valves moved and i don't want to burn that shit in clean cylinders! Quote Link to comment Share on other sites More sharing options...
fuel Posted August 18, 2010 Share Posted August 18, 2010 soaking it for a few days in a tub of sugar soap dilution tends to work. Otherwise talk to your local friendly mechanic or transmission specialist and get them to 'hot wash' it. Quote Link to comment Share on other sites More sharing options...
tortron Posted August 18, 2010 Share Posted August 18, 2010 add a cup of meths to your fuel tank and drive around or if the head is off - scrape away with some copper sheet Quote Link to comment Share on other sites More sharing options...
barf Posted August 18, 2010 Author Share Posted August 18, 2010 thanks head is off but i don't have a valve spring compressor, just been turning the cam to open valves and clean it up :-\ Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 18, 2010 Share Posted August 18, 2010 Spray a heap of oven cleaner down the ports and leave to soak for 30 minutes - then hose off with water Quote Link to comment Share on other sites More sharing options...
bubblegoose Posted August 18, 2010 Share Posted August 18, 2010 Spray a heap of oven cleaner down the ports and leave to soak for 30 minutes - then hose off with water orly? does it get the super hardcore shit off the valves too? i lol at how effective house hold cleaners are for engine related stz ive always been taking my valves out and attacking with wire wheel Quote Link to comment Share on other sites More sharing options...
tortron Posted August 18, 2010 Share Posted August 18, 2010 oven cleaner on aluminium doesnt sound like a sound idea to me Quote Link to comment Share on other sites More sharing options...
cubastreet Posted August 18, 2010 Share Posted August 18, 2010 washing soda. Quote Link to comment Share on other sites More sharing options...
Simon Posted August 18, 2010 Share Posted August 18, 2010 washing soda. Was going to say. Too bad that rusty guy has gone. The crystals he sold are flippin fantastic. Quote Link to comment Share on other sites More sharing options...
cubastreet Posted August 19, 2010 Share Posted August 19, 2010 bought 1kg at pak n save last week for $8 Quote Link to comment Share on other sites More sharing options...
barf Posted August 20, 2010 Author Share Posted August 20, 2010 whats best on valves? Quote Link to comment Share on other sites More sharing options...
tortron Posted August 20, 2010 Share Posted August 20, 2010 stick the valve in an electric drill and use ultra fine steel wool Quote Link to comment Share on other sites More sharing options...
85_z31 Posted August 21, 2010 Share Posted August 21, 2010 Tergo Industries envro degreaser is the SHIT to use only it costs heaps and comes in a 20L drum I have used it for all my cylinder heads, blocks, valves and everything works really fast. Quote Link to comment Share on other sites More sharing options...
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