Sludge/carbon build up - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

japslapsilvia · 09-07-2010, 08:15 PM

bought a motor from a vendor here. outside looks great. BUT i opened the valve cover and there is a LOT of black carbon burnt oil etc. now the thing is the cam lobes look great no scoring or heat marks.

also the motor came with no spark plugs which leads me to believe that a compression check was done. i will have to confirm with the seller.

i also removed the thermostat housing and its SUPER clean whatever coolant that was left was clean. There appears to be no scaling or rust in the thermostat housing. i wil have to remove upper coolant neck to check it as well, and the pump

no my question is what would you guys determine as being bad or good in terms of sludge/carbon under the valve cover? pics would help.

what can i do as far as cleaning it? can i or should i use carb cleaner? honestly looks like motor sat for a while and or oil wasnt changed frequently...its really black....

motor is a black top SR

unfortunatly i do not have pics at the moment. i will post them tomorrow when i get home.

Thanks!

c72c · 09-07-2010, 08:31 PM

it all depends how bad it is. i don't have any pics to show my opinion, but, a friend and i just picked up a 14 from a guy who had it for 3 years. he mentioned it ran rough and ticked a little at certain times. then he mentioned he hasn't changed the oil since he bought the car... i pulled the dipstick out, looked like syrup and was even sticky.
changed the oil, and it's running surprisingly smooth.
If it were for an engine i want to keep running and not worry about it shitting the bed, flush it a few times. you can use a half a quart of atf mixed with the oil to break up sludge, run it through, then flush it without atf once or twice after.
also check the front and rear main seals.

Bigsyke · 09-07-2010, 11:01 PM

ATF will dilute the add pack, switch to rotella T6 if you want good cleaning, plus its works well with our cars.

c72c · 09-09-2010, 11:27 AM

Quote:

Originally Posted by Bigsyke

ATF will dilute the add pack, ....

what is said add pack?

japslapsilvia · 09-09-2010, 11:50 AM

Quote:

Originally Posted by c72c

what is said add pack?

i believe he is refering to the additive's in the oil. That the ATF will render any and all additives useless...

c72c · 09-09-2010, 12:22 PM

Quote:

Originally Posted by japslapsilvia

i believe he is refering to the additive's in the oil. That the ATF will render any and all additives useless...

when you put the ATF in, that is your additive. it breaks everything loose and helps clean it all out. then you flush it out with an oil change or two. you don't run it longer than a few minutes.
so the additives in your oil don't really matter during that time.

klits562 · 09-08-2010, 12:44 PM

I've personally used Seafoam and it seemed to do a very good job engine felt more responsive after wards its suppose to be really good for carbon build up. Just make sure you read the directions on how to use Seafoam as it dilutes oil and if its left in there might do damage.

BoostSlideWayz · 09-08-2010, 01:23 PM

man some people on here suck when selling shit to you. I bought a motor from someone on here. they said the motor ran perfect and had no problems what so ever.. when i started it, it was smoking like crazy. so i took the head off and first pistons rings were soo bad the pistion wiggled back and forth and same thing for piston 3. Sometimes you need to do some serious inspections on the spot before you buy. but your case doesnt seem bad at all really. good luck

japslapsilvia · 09-08-2010, 07:18 PM

Quote:

Originally Posted by c72c

it all depends how bad it is. i don't have any pics to show my opinion, but, a friend and i just picked up a 14 from a guy who had it for 3 years. he mentioned it ran rough and ticked a little at certain times. then he mentioned he hasn't changed the oil since he bought the car... i pulled the dipstick out, looked like syrup and was even sticky.
changed the oil, and it's running surprisingly smooth.
If it were for an engine i want to keep running and not worry about it shitting the bed, flush it a few times. you can use a half a quart of atf mixed with the oil to break up sludge, run it through, then flush it without atf once or twice after.
also check the front and rear main seals.

yea oil isnt that bad its still liquidy...lol just pretty dam black...also got a new front main seal..

Quote:

Originally Posted by Bigsyke

ATF will dilute the add pack, switch to rotella T6 if you want good cleaning, plus its works well with our cars.

good point, i will probably use rotella or develac (sp?)

Quote:

Originally Posted by klits562

I've personally used Seafoam and it seemed to do a very good job engine felt more responsive after wards its suppose to be really good for carbon build up. Just make sure you read the directions on how to use Seafoam as it dilutes oil and if its left in there might do damage.

i have used seafoam before but NEVER in oil just through a vac line..

Quote:

Originally Posted by BoostSlideWayz

man some people on here suck when selling shit to you. I bought a motor from someone on here. they said the motor ran perfect and had no problems what so ever.. when i started it, it was smoking like crazy. so i took the head off and first pistons rings were soo bad the pistion wiggled back and forth and same thing for piston 3. Sometimes you need to do some serious inspections on the spot before you buy. but your case doesnt seem bad at all really. good luck

motor turns over very easily by hand so thank god no issues like that..

on to the pics, most of this stuff just wipes right off with a rag..it not really caked or burnt..

and a close up of the cam lobes

let me know what u think...im still debating if it is safe to spray it down wit carb cleaner?? thoughts??

THANKS!!

BoostSlideWayz · 09-08-2010, 07:27 PM

Quote:

Originally Posted by japslapsilvia

yea oil isnt that bad its still liquidy...lol just pretty dam black...also got a new front main seal..

good point, i will probably use rotella or develac (sp?)

i have used seafoam before but NEVER in oil just through a vac line..

motor turns over very easily by hand so thank god no issues like that..

on to the pics, most of this stuff just wipes right off with a rag..it not really caked or burnt..

and a close up of the cam lobes

let me know what u think...im still debating if it is safe to spray it down wit carb cleaner?? thoughts??

THANKS!!

it shouldnt turn over too easily by hand... you need to get a compression check.. make sure yourself the compression is good.

japslapsilvia · 09-08-2010, 07:38 PM

Quote:

Originally Posted by BoostSlideWayz

it shouldnt turn over too easily with your hand... you need to get a compression check.. make sure yourself the compression is good.

sorry what i mean is it turns over fairly easy by hand, using a 1/2 inch ratchet and socket, also i am not able to turn the motor over a ful 360* bc its on the ground and the flex plate is getting in the way...i was able to get a total of 45*of turn...i will do a compression this weekend when i get the motor on the stand.
THANKS!!!!

BoostSlideWayz · 09-08-2010, 08:00 PM

Quote:

Originally Posted by japslapsilvia

sorry what i mean is it turns over fairly easy by hand, using a 1/2 inch ratchet and socket, also i am not able to turn the motor over a ful 360* bc its on the ground and the flex plate is getting in the way...i was able to get a total of 45*of turn...i will do a compression this weekend when i get the motor on the stand.
THANKS!!!!

ohh ok, well good luck !! and i usualy use brake cleaner for taking that kinda stuff off it works great. you dont have to worry about getting chemicals on the head theres nothing but metal in there besides the valve stems with the little rubber peices but it wont effect those.

Bigsyke · 09-08-2010, 10:26 PM

DONT use brake cleaner!

Run some T6 with 1/2 qt of marvel mystery oil. It will take all that stuff out in about 3k miles.

That sludge is not that bad, just do a normal oil change.

soreballz · 09-08-2010, 10:41 PM

Quote:

Originally Posted by Bigsyke

DONT use brake cleaner!

Please elaborate.

japslapsilvia · 09-09-2010, 07:30 AM

Quote:

Originally Posted by soreballz

Please elaborate.

X2

would the brake cleaner or carb cleaner have a negative effect on bearing surfaces? lobes, rocker pads, etc?

smoked240 · 09-09-2010, 08:22 AM

It shouldn't. I use brake cleaner/Carb cleaner on Engines,Tranny's,Diff's. And I have not had a problem.

efrain240sx · 09-09-2010, 11:41 PM

Well i don't know what exactly it is about ATF fluid that breaks down slug so good. My drivetrain instructor told us about the trick; he then did a demonstration on a live car that had some build up in it, and when he was done the slug was gone. He said that the reason the ATF fliud broke it down is becasue ATF fluid is rich in detergents. There is no need to get crazy about this, i'm just trying to pass on a neat trick my teacher showed me.

japslapsilvia · 09-12-2010, 07:41 PM

ok i ended up sprayin down the head with sea foam deep clean,.....its suppose to clean n lubricare...most of the blackneess went away and drained in the pan...after that was done i poured some oil over all components i will post pics when i get a chance

Thanks!!

va240dude · 09-13-2010, 05:58 AM

Quote:

Originally Posted by japslapsilvia

ok i ended up sprayin down the head with sea foam deep clean,.....its suppose to clean n lubricare...most of the blackneess went away and drained in the pan...after that was done i poured some oil over all components i will post pics when i get a chance

Thanks!!

Yeah I've used Seafoam before and it worked well!

09-07-2010, 08:31 PM	#2
c72c Zilvia Addict Join Date: Jul 2009 Location: Albuquerque Posts: 944 Trader Rating: (25) Feedback Score: 25 reviews	it all depends how bad it is. i don't have any pics to show my opinion, but, a friend and i just picked up a 14 from a guy who had it for 3 years. he mentioned it ran rough and ticked a little at certain times. then he mentioned he hasn't changed the oil since he bought the car... i pulled the dipstick out, looked like syrup and was even sticky. changed the oil, and it's running surprisingly smooth. If it were for an engine i want to keep running and not worry about it shitting the bed, flush it a few times. you can use a half a quart of atf mixed with the oil to break up sludge, run it through, then flush it without atf once or twice after. also check the front and rear main seals. __________________

09-08-2010, 01:23 PM	#8
BoostSlideWayz Nissanaholic! Join Date: Sep 2008 Location: Lebec Age: 36 Posts: 1,686 Trader Rating: (1) Feedback Score: 1 reviews	man some people on here suck when selling shit to you. I bought a motor from someone on here. they said the motor ran perfect and had no problems what so ever.. when i started it, it was smoking like crazy. so i took the head off and first pistons rings were soo bad the pistion wiggled back and forth and same thing for piston 3. Sometimes you need to do some serious inspections on the spot before you buy. but your case doesnt seem bad at all really. good luck __________________ 1994 toyota supra...... n-a D= 1992 nissan 240sx KA24E-T fully Built =D

09-09-2010, 08:22 AM	#16
smoked240 Zilvia FREAK! Join Date: Jun 2010 Location: North Dakota Age: 34 Posts: 1,067 Trader Rating: (4) Feedback Score: 4 reviews	It shouldn't. I use brake cleaner/Carb cleaner on Engines,Tranny's,Diff's. And I have not had a problem. __________________

09-07-2010, 11:01 PM	#3
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	ATF will dilute the add pack, switch to rotella T6 if you want good cleaning, plus its works well with our cars.

09-08-2010, 12:44 PM	#7
klits562 Zilvia Member Join Date: Aug 2010 Location: Norwalk, CA Age: 34 Posts: 152 Trader Rating: (0) Feedback Score: 0 reviews	I've personally used Seafoam and it seemed to do a very good job engine felt more responsive after wards its suppose to be really good for carbon build up. Just make sure you read the directions on how to use Seafoam as it dilutes oil and if its left in there might do damage.

09-08-2010, 10:26 PM	#13
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 40 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	DONT use brake cleaner! Run some T6 with 1/2 qt of marvel mystery oil. It will take all that stuff out in about 3k miles. That sludge is not that bad, just do a normal oil change.

09-09-2010, 11:41 PM	#17
efrain240sx Leaky Injector Join Date: Mar 2006 Location: azusa ca Posts: 127 Trader Rating: (0) Feedback Score: 0 reviews	Well i don't know what exactly it is about ATF fluid that breaks down slug so good. My drivetrain instructor told us about the trick; he then did a demonstration on a live car that had some build up in it, and when he was done the slug was gone. He said that the reason the ATF fliud broke it down is becasue ATF fluid is rich in detergents. There is no need to get crazy about this, i'm just trying to pass on a neat trick my teacher showed me.