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

 

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

 

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

 

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

 

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

 

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

 

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

 

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.***.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
>
>

 

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.***.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
>
>

 

"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
..