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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 10-27-2008, 07:26 PM   #1
gippy87
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Best way to clean head gasket residue off the block?

Im replacing the head gasket on my sr tommorrow. If the block is straight, what will be the best method to removing the old gasket residue other then resurfacing.

This is what it looked like after a razor blade


You can see it was still very dirty.
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Old 10-27-2008, 07:34 PM   #2
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Acetone or laquer thinner should take most of it off... You can also use a very fine steel wool or sand paper, 1000 grit or higher..
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Old 10-27-2008, 08:14 PM   #3
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I was going to use liquor and sand paper. Tell me how it goes, I plan to do the same thing soon.
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Old 10-27-2008, 08:16 PM   #4
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I've used a green scothbright pad on that area, the area where the upper oil pan bolts, and the front of the block also w/ good results.
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Old 10-27-2008, 08:26 PM   #5
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you can pick up gasket remover from advance auto parts, that works really well if you use a green scuff pad with it
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Old 10-27-2008, 08:31 PM   #6
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Yeah Razor blade, carb cleaner and a brillow pad

Id refrain from using Sand paper or steel wool Metal shavings or sand in your oil system = Bad Ju Ju
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Old 10-27-2008, 08:38 PM   #7
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yeah that steel wool can leave fine hair in there. When we use it to clean windows after a cars been painted we never wash the car we allways blow em off with air to avoid scratching the paint..anyways i would use a gasket scraper and some gasket remover to get it off clean.
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Old 10-27-2008, 08:51 PM   #8
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looks like ill be using a scuff pad and gasket remover
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Old 10-27-2008, 09:15 PM   #9
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be carefull with the scuff pad. Put some lint free towls or paper on top the pistons and walls to avoid getting fine dirt or hairs from the scuffing pad.
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Old 10-27-2008, 09:34 PM   #10
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aircraft paint remover ftw
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Old 10-27-2008, 11:28 PM   #11
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high girt sand paper, steady hands and permatex gasket remover, worked for me about 20 times now for metal and composite gaskets, motor blowing more than 30 psi at times
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Old 10-28-2008, 01:38 AM   #12
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I used a razor blade to get most of the paper off, sandpaper to clean it up, and brake cleaner to clean off
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Old 10-28-2008, 05:55 AM   #13
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I'd go with the really fine sandpaper, I forgot about steel wool, scuff pads and what not breaking apart... Haven't used them in a long time. Get 1.5k sandpaper and a sanding block to keep it level...
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Old 10-28-2008, 07:23 AM   #14
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they make these things called bristle disks. looks like a wire wheel made out of a hard plastic. takes off the material without removing metal. i love them.

look like this

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Old 10-28-2008, 07:53 AM   #15
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i used synthetic steel wool ultra fine (like a scotch bright but not as abrasive) soaked in engine oil worked out pretty good, and leaves a very shinny sruface. then i cleaned out the oil residue with brake cleaner.
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Old 10-28-2008, 08:01 AM   #16
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nylon bristle rol-loc for winnage... use them all th etime.
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Old 10-28-2008, 05:23 PM   #17
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a 4" angle grinder with a metal cutting disc, the biggest hammar you can find along with the most gnarly flat head punch you have...then go ballistic...lol jk i usually use a razor blade, verrrrrry lightly(you can shave aluminum easier than most people think) then sometimes very lightly with a scuff pad and brake/carb clean
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Old 10-28-2008, 09:51 PM   #18
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what oneviaman suggested is what you would usually use in a mech shop. just make sure you get the right one. i can't quite remember but i think the yellow one is for alum. and the blue one is for steel or cast iron. or other way around. use the steel one on alum. and u will start removing material that you want to keep. and i usaully spray brake cleaner on first and then hit it with the brush. the gasket remover does burn the flesh. so i don't use it if i can help it. dude that stuff hurts. stay away from the cutting disc muahahahaha

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Old 10-28-2008, 10:11 PM   #19
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seems like alot of different answers now i have to choose.. hmmm.
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Old 10-28-2008, 10:18 PM   #20
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Why not call your local machine shop if you're really worried. Any of the answers in this thread will work though. Just do what you feel most comfortable with.
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Old 10-28-2008, 10:21 PM   #21
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just go for what seems easiest to get your hands on
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Old 10-28-2008, 10:24 PM   #22
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[QUOTE=mxsx25;2414951]a 4" angle grinder with a metal cutting disc, the biggest hammar you can find along with the most gnarly flat head punch you have...then go ballistic.../QUOTE]

This is probably the best way to do it
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Old 10-29-2008, 06:35 PM   #23
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i went with the angle grinder method since a couple people seemed to agree it was the best way. it wasnt exactly the finish i was looking for i hope it didnt shave to much off the block...
































lol jk
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Old 10-29-2008, 06:45 PM   #24
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use an ice scraper

It's what everyone at my dealership uses and it's what my instructor's making us use
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Old 10-30-2008, 10:32 AM   #25
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use an ice scraper

It's what everyone at my dealership uses and it's what my instructor's making us use
yeah use this and a solvent, 0 chance of scoring the block
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Old 10-30-2008, 12:58 PM   #26
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heres what i do, soak it with brake cleaner or carb cleaner, then take a razor blade and scrape it off and just repeat this cycle over and over again and once youve done that take a sheet of sandpaper 1000 grade or higher and sand for about 2 or 3 minutes
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Old 10-30-2008, 11:07 PM   #27
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Just use a drill with a wire wheel on it and it will take you a few minutes. It won't remove metal either. I did it with my rebuild and I even used it to remove all the carbon build up on the pistons too.
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Old 10-30-2008, 11:45 PM   #28
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Just use a drill with a wire wheel on it and it will take you a few minutes. It won't remove metal either. I did it with my rebuild and I even used it to remove all the carbon build up on the pistons too.
Thats a bad idea, and yes, it will remove metal
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Old 10-31-2008, 07:31 AM   #29
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A wire wheel brush will not damage a cast iron block. Most mechanics shops will use a die grinder with a wire wheel attached. This wont damage a cast iron block, yes it'll harm an aluminum block or other aluminum pieces but you'd have to sit there for hours and wear that wire wheel to nothing in order to hurt cast iron. And yes, I'm speaking from experience. I've been a technician for 5 years now and done my share of this type of work. A die grinder with a wire wheel attachment is by far the fastest and easiest method for removing head gasket material. Also, just as mxexux stated, you can also clean the piston tops with it as well, it won't harm them either.
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Old 10-31-2008, 08:24 AM   #30
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I build motocross race engines and what I do is razor blade the big stuff, use the RED scotch brite and some brake or carb cleaner. Scotch brite pads come in different abrasives gray-fine,red-medium and green is rough. I never use the green on anything aluminum only on steel. Hope this helps someone.
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