User Tag List

Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: YJ 4.2 Mystery Oil Leak

  1. #1
    Meangrn c.walston's Avatar
    Join Date
    Mar 2009
    Location
    Dover
    Posts
    80

    Branch
    Air Force
    Status
    Serving
    Served
    2000 to Present

    Closest Installation

    Dover AFB
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default YJ 4.2 Mystery Oil Leak

    Need some Help!!!!!!!! I got a 90 YJ 4.2 ltr. that has a mystery oil leak....after I drive on the road for about 15-20 min the pass. side of the eng comp is covered in oil...covering from the fuel pump to the tranny.

    I have already changed my distributor seal, oil filter, tightend my oil pan and valve cover...is there anything else on that side that could be leaking that I just can't see because of all of the oil?

    I do have a valve cover leak as well but it isn't leaking enough to cause this leak...I also tried loading the eng @ 2500 rpm for 10 min in the garage to see if I could spot the leak and nothing...but as soon as I get her on the road...there she goes again!

    Any assistatance would be great!
    Chris

  2. #2
    Recovery Whore RescueJP's Avatar
    Join Date
    Sep 2008
    Location
    DumFries Virginia/Fort Belvoir
    Posts
    2,623

    Branch
    Army
    Status
    Serving
    Served
    2005 to Present

    Closest Installation

    Fort Belvoir
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    could it be blow bye possibly. Man its a 4.2 it aint a mystery its a monster lol. I fix one leak 2 days later get a new one so on and so on
    1981 CJ7- 4in lift on 33's, Twin sticked dana300, aussied D30, Custom bumpers,Herced inside. Riddler covers.

    RIPTrail-87yj 35MTR

    76 cj- Team MJ Buggy

    07 F150 "Tow Whore"- 2.5in auto spring, 33's, Full flomaster exhaust, K&N intake, Edge Programer

    Sapper

  3. #3
    Super D the Head Fab Monkey mousee's Avatar
    Join Date
    Jan 2009
    Location
    laurerlton(BFE PA)
    Posts
    44

    Branch
    Other / None
    Status
    Other / None
    Served
    2009 to Present

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    worry when it QUITS leaking!
    Check yer oil pressure sender. also check yer timing cover.
    Mine will leak down to a quart low and quit leaking. If I add, it will leak it right back out, if I leave it, it will stay there... figure THAT out! lol
    Last edited by mousee; 03-17-2009 at 22:55.
    Mt. Valley Customs

  4. #4
    5.9,242,4.56F/R Aussies sadass's Avatar
    Join Date
    Feb 2009
    Location
    Hopewell
    Posts
    76

    Branch
    Navy
    Status
    Served
    Served
    1988 to 1994

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    [quote=mousee;66459]worry when it QUITS leaking!
    That is a good one, I am going to remember that.
    I second checking the oil pressure sending unit .
    98 ZJ 5.9, 242.
    I fix the things that make the things that make things happen

  5. #5
    Meangrn c.walston's Avatar
    Join Date
    Mar 2009
    Location
    Dover
    Posts
    80

    Branch
    Air Force
    Status
    Serving
    Served
    2000 to Present

    Closest Installation

    Dover AFB
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Thanx for the info so far...I will try to see if letting it run a quart low will work for now...if not I will keep on adding oil to her until I can get under her and check the oil pressure sender...working 12's is a pain!!!!!!!!!!!
    chris

  6. #6
    Fix it until it's broke CrazyHorse6's Avatar
    Join Date
    Sep 2008
    Location
    Irmo
    Posts
    1,137

    Branch
    Army
    Status
    Served
    Served
    1998 to 2009

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Check your PCV valve - does it still rattle? If not you may be getting blow by, coupled with the wind from driving its spraying the leak all over the place. Also check to see if its leaking out of the dipstick.
    GarryOwen!
    CJ7, 258, Dana 20 T-case, Dana 30 & AMC 20, TFI Ignition upgrade, headers, MC 2100 carb, YJ tub mod w/Family Style roll bar...

  7. #7
    Recovery Whore RescueJP's Avatar
    Join Date
    Sep 2008
    Location
    DumFries Virginia/Fort Belvoir
    Posts
    2,623

    Branch
    Army
    Status
    Serving
    Served
    2005 to Present

    Closest Installation

    Fort Belvoir
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    ooooooo mine is leakin out the oil breather only at speeds above 55
    1981 CJ7- 4in lift on 33's, Twin sticked dana300, aussied D30, Custom bumpers,Herced inside. Riddler covers.

    RIPTrail-87yj 35MTR

    76 cj- Team MJ Buggy

    07 F150 "Tow Whore"- 2.5in auto spring, 33's, Full flomaster exhaust, K&N intake, Edge Programer

    Sapper

  8. #8
    Meangrn c.walston's Avatar
    Join Date
    Mar 2009
    Location
    Dover
    Posts
    80

    Branch
    Air Force
    Status
    Serving
    Served
    2000 to Present

    Closest Installation

    Dover AFB
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    I've got a new PCV valve...and no oil from the D-stick...I got new oil pan and valve cover gaskets I'm going to put on soon to help me try and narrow down where the leak is coming from...so we shall see...but it is definatly a good possiblity of blow-by...also let the oil run a little low and its not leaking as bad right now!
    chris

  9. #9
    Recovery Whore RescueJP's Avatar
    Join Date
    Sep 2008
    Location
    DumFries Virginia/Fort Belvoir
    Posts
    2,623

    Branch
    Army
    Status
    Serving
    Served
    2005 to Present

    Closest Installation

    Fort Belvoir
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    what about me anyone anyideas on oil threw the oil breather at the back of the valve cover
    1981 CJ7- 4in lift on 33's, Twin sticked dana300, aussied D30, Custom bumpers,Herced inside. Riddler covers.

    RIPTrail-87yj 35MTR

    76 cj- Team MJ Buggy

    07 F150 "Tow Whore"- 2.5in auto spring, 33's, Full flomaster exhaust, K&N intake, Edge Programer

    Sapper

  10. #10
    Fix it until it's broke CrazyHorse6's Avatar
    Join Date
    Sep 2008
    Location
    Irmo
    Posts
    1,137

    Branch
    Army
    Status
    Served
    Served
    1998 to 2009

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by rescueyj View Post
    what about me anyone anyideas on oil threw the oil breather at the back of the valve cover
    Remove your valve cover and thoroughly clean it out to ensure no deposits are clogging the PCV valve and the breather. If either are clogged, it can limit pressure from escaping and limit crankcase breathing. If you stilll have the problem after cleaning the valve cover, its probably blow-by from the piston rings.

    Take a look at this link over to jeepforum which discusses your engine and similar problem.

    Crazy
    GarryOwen!
    CJ7, 258, Dana 20 T-case, Dana 30 & AMC 20, TFI Ignition upgrade, headers, MC 2100 carb, YJ tub mod w/Family Style roll bar...

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the MJ Supporter Membership for a little less than $0.06 a day and get more space, 2 MJ Stickers and no banners ads. [Check it out]