CJ8 carbon deposits?
I'm getting my CJ8 six cylinder in shape.
I recently replaced the spark plugs. Though old in age they have very few miles on them; they looked very good -- except for a lot of carbon-looking darkness away from the gap. I also shined a bright light into the cylinders where it appears VERY dark and carbon-like on the top of the pistons; like a deposit. This is probably due to the couple of hundred miles/year I've put on the Scrambler for the past few years; along with the old, never quite right stock carburator (now replaced with a Weber). Engine seems in great shape and repeated oil analysis confirm that there is very little wear over the 51,000 miles. Question is -- is there some way without dismantling the engine to get rid of these deposits? Is there something I can put in the gas that will remove them safely?? I've been told this is a common issue in the marine industry, but don't know what to use. If there is anything that will work?? Any suggestions, please ..... Thanks. Mike Michael Pomeroy |
Re: CJ8 carbon deposits?
pomerom@yahoo.com did pass the time by typing:
> I'm getting my CJ8 six cylinder in shape. > > I recently replaced the spark plugs. Though old in age they have very > few miles on them; they looked very good -- except for a lot of > carbon-looking darkness away from the gap. Yep.. too rich. (a little black is ok, flakes of black indicate way rich conditions or plugs that are too cool) > Question is -- is there some way without dismantling the engine to get > rid of these deposits? Is there something I can put in the gas that > will remove them safely?? safely is a matter of conjecture and depends on the amount of carbon that has built up. Some old tricks involve slowly dribbling water down the carb. That breaks up the carbon. Some use ATF fluid as well and that will produce a HUGE black cloud. Others have mentioned SeaFoam, but I though that was only for cleaning the oil galleys. -- DougW |
Re: CJ8 carbon deposits?
pomerom@yahoo.com did pass the time by typing:
> I'm getting my CJ8 six cylinder in shape. > > I recently replaced the spark plugs. Though old in age they have very > few miles on them; they looked very good -- except for a lot of > carbon-looking darkness away from the gap. Yep.. too rich. (a little black is ok, flakes of black indicate way rich conditions or plugs that are too cool) > Question is -- is there some way without dismantling the engine to get > rid of these deposits? Is there something I can put in the gas that > will remove them safely?? safely is a matter of conjecture and depends on the amount of carbon that has built up. Some old tricks involve slowly dribbling water down the carb. That breaks up the carbon. Some use ATF fluid as well and that will produce a HUGE black cloud. Others have mentioned SeaFoam, but I though that was only for cleaning the oil galleys. -- DougW |
Re: CJ8 carbon deposits?
I worked in garages for years and they always used a pint of ATF to
decarbon an engine. I did it to my CJ before a head gasket job and it looked like new with a couple big loose chunks of carbon still in a couple cylinders. You heat up the engine and slowly pour the pint of ATF down the carb while keeping your hand on the throttle to keep it running. Pour too fast and it will stall out, you don't want that. Then when it's finished shut it down for 10 minutes or so. Start it back up and rev it good and you are good to go. It makes one massive cloud of smoke, but does a sweet job. I have been told that a pint of water will do the same, but have no first hand experience on that. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's pomerom@yahoo.com wrote: > > I'm getting my CJ8 six cylinder in shape. > > I recently replaced the spark plugs. Though old in age they have very > few miles on them; they looked very good -- except for a lot of > carbon-looking darkness away from the gap. > > I also shined a bright light into the cylinders where it appears VERY > dark and carbon-like on the top of the pistons; like a deposit. > > This is probably due to the couple of hundred miles/year I've put on > the Scrambler for the past few years; along with the old, never quite > right stock carburator (now replaced with a Weber). > > Engine seems in great shape and repeated oil analysis confirm that > there is very little wear over the 51,000 miles. > > Question is -- is there some way without dismantling the engine to get > rid of these deposits? Is there something I can put in the gas that > will remove them safely?? > > I've been told this is a common issue in the marine industry, but > don't know what to use. If there is anything that will work?? > > Any suggestions, please ..... > > Thanks. > > Mike > Michael Pomeroy |
Re: CJ8 carbon deposits?
I worked in garages for years and they always used a pint of ATF to
decarbon an engine. I did it to my CJ before a head gasket job and it looked like new with a couple big loose chunks of carbon still in a couple cylinders. You heat up the engine and slowly pour the pint of ATF down the carb while keeping your hand on the throttle to keep it running. Pour too fast and it will stall out, you don't want that. Then when it's finished shut it down for 10 minutes or so. Start it back up and rev it good and you are good to go. It makes one massive cloud of smoke, but does a sweet job. I have been told that a pint of water will do the same, but have no first hand experience on that. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's pomerom@yahoo.com wrote: > > I'm getting my CJ8 six cylinder in shape. > > I recently replaced the spark plugs. Though old in age they have very > few miles on them; they looked very good -- except for a lot of > carbon-looking darkness away from the gap. > > I also shined a bright light into the cylinders where it appears VERY > dark and carbon-like on the top of the pistons; like a deposit. > > This is probably due to the couple of hundred miles/year I've put on > the Scrambler for the past few years; along with the old, never quite > right stock carburator (now replaced with a Weber). > > Engine seems in great shape and repeated oil analysis confirm that > there is very little wear over the 51,000 miles. > > Question is -- is there some way without dismantling the engine to get > rid of these deposits? Is there something I can put in the gas that > will remove them safely?? > > I've been told this is a common issue in the marine industry, but > don't know what to use. If there is anything that will work?? > > Any suggestions, please ..... > > Thanks. > > Mike > Michael Pomeroy |
Re: CJ8 carbon deposits?
No Kiddin' Right Mike!? I'm kinda dealing with the same thing. So what
you're saying is to drizzle a pint of ATF straight down the throat of the carb. Obviously, not trying to stall the engine. Once the last drop is in, shut it down 10 min's. Fire it up and give it a rev. Sounds pretty cool. I'd love to try it just to get my neighbor reaction! They used to shake their heads at my old nissan that burned a quart of oil every tanks of gas. -- Thanks Always !!! Paul '75 CJ5 258 Vail, CO. "Mike Romain" <romainm@sympatico.ca> wrote in message news:3F7B7EAD.9B90CB48@sympatico.ca... > I worked in garages for years and they always used a pint of ATF to > decarbon an engine. > > I did it to my CJ before a head gasket job and it looked like new with a > couple big loose chunks of carbon still in a couple cylinders. > > You heat up the engine and slowly pour the pint of ATF down the carb > while keeping your hand on the throttle to keep it running. Pour too > fast and it will stall out, you don't want that. > > Then when it's finished shut it down for 10 minutes or so. Start it > back up and rev it good and you are good to go. > > It makes one massive cloud of smoke, but does a sweet job. > > I have been told that a pint of water will do the same, but have no > first hand experience on that. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > pomerom@yahoo.com wrote: > > > > I'm getting my CJ8 six cylinder in shape. > > > > I recently replaced the spark plugs. Though old in age they have very > > few miles on them; they looked very good -- except for a lot of > > carbon-looking darkness away from the gap. > > > > I also shined a bright light into the cylinders where it appears VERY > > dark and carbon-like on the top of the pistons; like a deposit. > > > > This is probably due to the couple of hundred miles/year I've put on > > the Scrambler for the past few years; along with the old, never quite > > right stock carburator (now replaced with a Weber). > > > > Engine seems in great shape and repeated oil analysis confirm that > > there is very little wear over the 51,000 miles. > > > > Question is -- is there some way without dismantling the engine to get > > rid of these deposits? Is there something I can put in the gas that > > will remove them safely?? > > > > I've been told this is a common issue in the marine industry, but > > don't know what to use. If there is anything that will work?? > > > > Any suggestions, please ..... > > > > Thanks. > > > > Mike > > Michael Pomeroy |
Re: CJ8 carbon deposits?
No Kiddin' Right Mike!? I'm kinda dealing with the same thing. So what
you're saying is to drizzle a pint of ATF straight down the throat of the carb. Obviously, not trying to stall the engine. Once the last drop is in, shut it down 10 min's. Fire it up and give it a rev. Sounds pretty cool. I'd love to try it just to get my neighbor reaction! They used to shake their heads at my old nissan that burned a quart of oil every tanks of gas. -- Thanks Always !!! Paul '75 CJ5 258 Vail, CO. "Mike Romain" <romainm@sympatico.ca> wrote in message news:3F7B7EAD.9B90CB48@sympatico.ca... > I worked in garages for years and they always used a pint of ATF to > decarbon an engine. > > I did it to my CJ before a head gasket job and it looked like new with a > couple big loose chunks of carbon still in a couple cylinders. > > You heat up the engine and slowly pour the pint of ATF down the carb > while keeping your hand on the throttle to keep it running. Pour too > fast and it will stall out, you don't want that. > > Then when it's finished shut it down for 10 minutes or so. Start it > back up and rev it good and you are good to go. > > It makes one massive cloud of smoke, but does a sweet job. > > I have been told that a pint of water will do the same, but have no > first hand experience on that. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > > pomerom@yahoo.com wrote: > > > > I'm getting my CJ8 six cylinder in shape. > > > > I recently replaced the spark plugs. Though old in age they have very > > few miles on them; they looked very good -- except for a lot of > > carbon-looking darkness away from the gap. > > > > I also shined a bright light into the cylinders where it appears VERY > > dark and carbon-like on the top of the pistons; like a deposit. > > > > This is probably due to the couple of hundred miles/year I've put on > > the Scrambler for the past few years; along with the old, never quite > > right stock carburator (now replaced with a Weber). > > > > Engine seems in great shape and repeated oil analysis confirm that > > there is very little wear over the 51,000 miles. > > > > Question is -- is there some way without dismantling the engine to get > > rid of these deposits? Is there something I can put in the gas that > > will remove them safely?? > > > > I've been told this is a common issue in the marine industry, but > > don't know what to use. If there is anything that will work?? > > > > Any suggestions, please ..... > > > > Thanks. > > > > Mike > > Michael Pomeroy |
Re: CJ8 carbon deposits?
Paul, ATF will work but it'll create a dense white cloud of smoke that your
neighbors will hate you for, or call the cops or fire department on. More commonly used for that purpose is plain old water. It works great and it doesn't produce huge clouds of smoke. Do it the same way as Mike described for ATF, it's what every mechanic I've ever seen do this uses and recommends. I've done this several times and it's a highly effective way to get rid of carbon deposits. Make darned sure to maintain control of the water and feed it in very slowly, you don't want to accidentally dump the entire container into the intake and cause hydrolock. I feed in 12-14 oz. of water and spend at least a minute to two minutes doing it. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "Paul Brogren" <pibrogren@msn.com> wrote in message news:blg2pn$bmg27$1@ID-190695.news.uni-berlin.de... > No Kiddin' Right Mike!? I'm kinda dealing with the same thing. So what > you're saying is to drizzle a pint of ATF straight down the throat of the > carb. Obviously, not trying to stall the engine. Once the last drop is in, > shut it down 10 min's. Fire it up and give it a rev. Sounds pretty cool. > I'd love to try it just to get my neighbor reaction! They used to shake > their heads at my old nissan that burned a quart of oil every tanks of gas. > > -- > Thanks Always !!! > Paul '75 CJ5 258 > Vail, CO. > "Mike Romain" <romainm@sympatico.ca> wrote in message > news:3F7B7EAD.9B90CB48@sympatico.ca... > > I worked in garages for years and they always used a pint of ATF to > > decarbon an engine. > > > > I did it to my CJ before a head gasket job and it looked like new with a > > couple big loose chunks of carbon still in a couple cylinders. > > > > You heat up the engine and slowly pour the pint of ATF down the carb > > while keeping your hand on the throttle to keep it running. Pour too > > fast and it will stall out, you don't want that. > > > > Then when it's finished shut it down for 10 minutes or so. Start it > > back up and rev it good and you are good to go. > > > > It makes one massive cloud of smoke, but does a sweet job. > > > > I have been told that a pint of water will do the same, but have no > > first hand experience on that. > > > > Mike > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > > 88 Cherokee 235 BFG AT's > > > > pomerom@yahoo.com wrote: > > > > > > I'm getting my CJ8 six cylinder in shape. > > > > > > I recently replaced the spark plugs. Though old in age they have very > > > few miles on them; they looked very good -- except for a lot of > > > carbon-looking darkness away from the gap. > > > > > > I also shined a bright light into the cylinders where it appears VERY > > > dark and carbon-like on the top of the pistons; like a deposit. > > > > > > This is probably due to the couple of hundred miles/year I've put on > > > the Scrambler for the past few years; along with the old, never quite > > > right stock carburator (now replaced with a Weber). > > > > > > Engine seems in great shape and repeated oil analysis confirm that > > > there is very little wear over the 51,000 miles. > > > > > > Question is -- is there some way without dismantling the engine to get > > > rid of these deposits? Is there something I can put in the gas that > > > will remove them safely?? > > > > > > I've been told this is a common issue in the marine industry, but > > > don't know what to use. If there is anything that will work?? > > > > > > Any suggestions, please ..... > > > > > > Thanks. > > > > > > Mike > > > Michael Pomeroy > > |
Re: CJ8 carbon deposits?
Paul, ATF will work but it'll create a dense white cloud of smoke that your
neighbors will hate you for, or call the cops or fire department on. More commonly used for that purpose is plain old water. It works great and it doesn't produce huge clouds of smoke. Do it the same way as Mike described for ATF, it's what every mechanic I've ever seen do this uses and recommends. I've done this several times and it's a highly effective way to get rid of carbon deposits. Make darned sure to maintain control of the water and feed it in very slowly, you don't want to accidentally dump the entire container into the intake and cause hydrolock. I feed in 12-14 oz. of water and spend at least a minute to two minutes doing it. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "Paul Brogren" <pibrogren@msn.com> wrote in message news:blg2pn$bmg27$1@ID-190695.news.uni-berlin.de... > No Kiddin' Right Mike!? I'm kinda dealing with the same thing. So what > you're saying is to drizzle a pint of ATF straight down the throat of the > carb. Obviously, not trying to stall the engine. Once the last drop is in, > shut it down 10 min's. Fire it up and give it a rev. Sounds pretty cool. > I'd love to try it just to get my neighbor reaction! They used to shake > their heads at my old nissan that burned a quart of oil every tanks of gas. > > -- > Thanks Always !!! > Paul '75 CJ5 258 > Vail, CO. > "Mike Romain" <romainm@sympatico.ca> wrote in message > news:3F7B7EAD.9B90CB48@sympatico.ca... > > I worked in garages for years and they always used a pint of ATF to > > decarbon an engine. > > > > I did it to my CJ before a head gasket job and it looked like new with a > > couple big loose chunks of carbon still in a couple cylinders. > > > > You heat up the engine and slowly pour the pint of ATF down the carb > > while keeping your hand on the throttle to keep it running. Pour too > > fast and it will stall out, you don't want that. > > > > Then when it's finished shut it down for 10 minutes or so. Start it > > back up and rev it good and you are good to go. > > > > It makes one massive cloud of smoke, but does a sweet job. > > > > I have been told that a pint of water will do the same, but have no > > first hand experience on that. > > > > Mike > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > > 88 Cherokee 235 BFG AT's > > > > pomerom@yahoo.com wrote: > > > > > > I'm getting my CJ8 six cylinder in shape. > > > > > > I recently replaced the spark plugs. Though old in age they have very > > > few miles on them; they looked very good -- except for a lot of > > > carbon-looking darkness away from the gap. > > > > > > I also shined a bright light into the cylinders where it appears VERY > > > dark and carbon-like on the top of the pistons; like a deposit. > > > > > > This is probably due to the couple of hundred miles/year I've put on > > > the Scrambler for the past few years; along with the old, never quite > > > right stock carburator (now replaced with a Weber). > > > > > > Engine seems in great shape and repeated oil analysis confirm that > > > there is very little wear over the 51,000 miles. > > > > > > Question is -- is there some way without dismantling the engine to get > > > rid of these deposits? Is there something I can put in the gas that > > > will remove them safely?? > > > > > > I've been told this is a common issue in the marine industry, but > > > don't know what to use. If there is anything that will work?? > > > > > > Any suggestions, please ..... > > > > > > Thanks. > > > > > > Mike > > > Michael Pomeroy > > |
Re: CJ8 carbon deposits?
"Mike Romain" <romainm@sympatico.ca> wrote in message news:3F7B7EAD.9B90CB48@sympatico.ca... > I worked in garages for years and they always used a pint of ATF to > decarbon an engine. Old timer in our tire shop used Marvel Mystery Oil... __ Steve .. |
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