just did compression test... wat was urs? mine was...

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

cylinder 1 : 185 2 : 183 3 : 183 4 : 184

im burning oil bad and suspected it was busted rings... but when i took out cylinder 2 some oil came out also... so it seems im burning oil from the the valves...

this means i dont need to buy a new engine but need a head rebuild:) good news for me!


User avatar
xX RB Xx
Posts: 3719
Joined: Wed Jun 20, 2007 3:15 pm
Car: SE3P, FC3S, FC3C.
Location: Japan

Post

it could just mean that you need new valve stem seals

User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

yeah... im thinking of just sandblasting the whole damn thing

User avatar
xX RB Xx
Posts: 3719
Joined: Wed Jun 20, 2007 3:15 pm
Car: SE3P, FC3S, FC3C.
Location: Japan

Post

please do it.. i want to know what will the result will be

hbpignosePA
Posts: 3481
Joined: Fri Dec 01, 2006 6:07 pm
Car: 90 240sx hatch (Jackstand Queen)
78 Datsun 280Z (RIP)
89 Toyota Cressida (Sold)
86 Nissan 200SX hatch (sold)
83 Nissan 280ZX turbo (parts car)
90 Volvo 240 (sold)
80 Toyota Cressida MX32 (new daily)
Location: Amish Country Pa

Post

damn dude are you for real?

or are you hear for our rolfcopters?

User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

i dunno wat that means... but yeah im foreal:)

im so happy, cuz i was about to buy a new KA for $200... now i could use dat money for a in the engine bay rebuild...

im gunna get a timimg chain from FRsport, a new knock sensor, and get my head machined along w/ valves... then ill need to find where my leak is coming from, reseal the oil pan w/ gasket, and thr in some nismo motor mounts:)

look for a build coming soon!!!

hbpignosePA
Posts: 3481
Joined: Fri Dec 01, 2006 6:07 pm
Car: 90 240sx hatch (Jackstand Queen)
78 Datsun 280Z (RIP)
89 Toyota Cressida (Sold)
86 Nissan 200SX hatch (sold)
83 Nissan 280ZX turbo (parts car)
90 Volvo 240 (sold)
80 Toyota Cressida MX32 (new daily)
Location: Amish Country Pa

Post

sweet ill keep and eye out when i need a good laugh

User avatar
Gabes13
Posts: 2385
Joined: Mon Mar 17, 2008 11:59 am
Car: rb20det s13
Location: St. Pete, Fl.

Post

I don't get it.

what are you going to sand blast and why?

User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

im going to get the valves sandblasted so that they sit on the head evenly...

carbon build up sticks to the seat so that it doesnt sit evenly and im my case its because my valves seals are old and cracked so that i leak and when the oil burns it builds up on the valve...

sand blasting is air and trillions of fine crystals be squirted at very high psi braking loose the carbon and making the valve like new... this way i dont need to buy new ones and save $300

you guys make fun of me make fun of me like youve never heard of sand blasting before...

User avatar
sebazztard
Posts: 2583
Joined: Fri Mar 02, 2007 9:44 pm
Car: 1992 Nissan 240sx rb25det project. 2000 Honda Accord LX DD. 1992 Nissan 300zx NA.

Post

24j0hn wrote:dat money

User avatar
Didderson
Posts: 2567
Joined: Sat Mar 18, 2006 4:05 pm
Car: 1990 Nissan 240SX FB
'88 Nissan Hardbody pickup
'74 Datsun Z
Location: Nor-Phillerdelph
Contact:

Post

Sand blasting the valves is NOT YOUR PROBLEM at this point buddy.

Oil is sliding through where the long rod is on those valves. Called a valve seal. Take the head off and replace em. I did a writeup that didn't get put into the articles section that you may search for.

Sandblasting them will help get the carbon off, but may just fuk up their surface so you'll have to re-seat them anyway. Just use goof off or carb cleaner to clean the valves duhhh

edit for claro clarity:Your compression is wonderful, which means even IF your valves have soooo much carbon on them (LOL) they're seating and sealing perfectly fine. You're correct the problem is oil coming thru the valves, but it has nothing to do w/ the valve seal seeing as the valves OPEN and thus the oil slides down the shaft and valve and enters. Sry we were all nubs once. I apologize but you acted like you knew exactly what was wrong and you weren't totally right so...

Also op, this is the 2nd time I've told you. your sig is filled with annoying nub grammar. the word site is a website, the word sight is the act of seeing.
Modified by Didderson at 9:21 PM 7/2/2009

User avatar
sebazztard
Posts: 2583
Joined: Fri Mar 02, 2007 9:44 pm
Car: 1992 Nissan 240sx rb25det project. 2000 Honda Accord LX DD. 1992 Nissan 300zx NA.

Post

true dat didderson

User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

of course im going to put new seals and seats... and here is something i said earlier
24j0hn wrote:valves seals are old and cracked so that i leak


and id rather SEAFOAM

User avatar
Didderson
Posts: 2567
Joined: Sat Mar 18, 2006 4:05 pm
Car: 1990 Nissan 240SX FB
'88 Nissan Hardbody pickup
'74 Datsun Z
Location: Nor-Phillerdelph
Contact:

Post

You don't need new seats for the valves, just seals.

Seafoam is great, but because you'll have the valves out your money'd be better spent on carb cleaner because it comes in a spray can. Steel wool it after soaking and you're good to go.Seafoam is better for use if you're not taking the head off because it uses combustion to extract carbon, but it still will do a bangup job without ignition.

User avatar
OutToWinPAHC
Posts: 8810
Joined: Thu May 31, 2007 12:19 pm
Car: 2015 Chevy Silverado
Nissan Skyline R33 GTS-t
Nissan Skyline R32 GTR
Nissan RB20 E46 RHD
2015 Harley Vrod Muscle
1990 Nissan Patrol
Location: PA
Contact:

Post

Just clean thr valves and head and do the seals...... If you don't feel like doing that take your head to a machine shop and have them sonic clean it for you and do the seals.

Sandblasting valves....... thats as bad as flushing the dirty oil out with water. Or porting and polishing your head with sand via engine vacuum

kc240guy
Posts: 425
Joined: Thu Jun 29, 2006 3:31 pm
Car: gold s13 and a maxima

Post

to quote Didderson (Also op, this is the 2nd time I've told you. your sig is filled with annoying nub grammar. the word site is a website, the word sight is the act of seeing.)

He could mean this website.... you know, a play on words.

User avatar
24j0hn
Posts: 696
Joined: Sun Dec 28, 2008 11:32 am
Car: 91' 240sx with some babying to be given

Post

i still need to change all my valve seals and get it machined i might as well get the head ported & polished and clean the valves and get the, reseated...


Return to “240sx General Discussion”