Thanks Thanks:  0 Likes Likes:  0 Dislikes Dislikes:  0
Results 1 to 12 of 12

Thread: Suddenly smoking from breather; positive crankcase pressure HELP!

  1. #1

    User Info Menu

    Exclamation Suddenly smoking from breather; positive crankcase pressure HELP!

    Today while sitting at a light, I noticed smoke coming from under the hood. . . turns out that it was coming out of the breather, not just a little, A LOT of vapour. I took the cap off the valve cover, and there seems to be positive pressure in the crankcase, as the cap will 'float' on the cover, and not from vibration either. . . now I am worried. Checked the oil, and I am about a quart down in 3. 000 miles. . . truck has around 150. 000 miles. . .

    I installed an 'improved' breather' as seen here: No drip Breather, and am wondering if my 'solution' has too much back-pressure. ( Complete details on the construction are HERE) However, it has been on around a week, and this just started today.

    In the meantime, I am going to run a hose to the back of the engine like everyone else. . .
    ,,The Dodge in Deutschland'' 2001 Ram 2500 Cummins Diesel, 5-Speed. as of 08/2015, 280.000 km.
    Definition of Continuous Improvement: "If it ain't broke, Fix it until it is"
    http://kriebelrestauration.de
    der Dodge in die Alpen:
    https://www.dropbox.com/s/8u8uktk7dk..._4271.JPG?dl=0

  2. #2

    User Info Menu

    Exclamation Still Smoking...

    Well, it seems that there was too much restriction in the canister I made. I ran a 3/4" hose under the cab, but it still has generating a heck of a lot of vapour. . . Very strange, the truck runs fine, but I never saw smoke before. . .

    Spent the last hour searching the archives. I need to take a look at the vacuum pump. The rubber elbow that connects from the pump to the hard plastic line is none to sporty if I remember, but I do not remember seeing any splits. . .
    Last edited by KrisKringle; 09-01-2012 at 08:02 AM. Reason: added information
    ,,The Dodge in Deutschland'' 2001 Ram 2500 Cummins Diesel, 5-Speed. as of 08/2015, 280.000 km.
    Definition of Continuous Improvement: "If it ain't broke, Fix it until it is"
    http://kriebelrestauration.de
    der Dodge in die Alpen:
    https://www.dropbox.com/s/8u8uktk7dk..._4271.JPG?dl=0

  3. #3

    User Info Menu

    Exclamation Problem Solved..thanks to the Forums

    well, today was a heck of a day. Anyway, I managed to stop by my 'second home' at Melchert Automobil, for a coffee and a breather. Speaking of breathers, the truck was sending out smoke signals while I waited at the light in Köln (Cologne). Not something that is good when one is driving an Auto in an 'Environmentally Protected Zone'. (We have stickers on the wind-shield here to designate if an Auto is allowed to drive in one of these areas, and my Dodge will never have one. . . . ).

    Well, with Stefan under the truck, I blocked off the vacuum from the pump, and low and behold, the amount of smoke decreased. . . well, almost disappeared. .

    It turned out (probably from my 15 minute lift-pump changes, that I over taxed the already weak hoses from the vacuum pump to the dash.

    Unfortunately, I did not take a picture of the 'Eureka Moment', but here are a few pictures of the results. . .

    Here is the finished repair:

    Name:  SAM_1206.jpg
Views: 3639
Size:  33.7 KB

    Oh, here is the offending part:


    Name:  SAM_1203.jpg
Views: 4066
Size:  22.4 KB

    Not really, but really, proof that the solution for the Dodge Ram occurred at Melchert's . . Thanks Stefan. . .

    Name:  SAM_1204.jpg
Views: 3889
Size:  24.3 KB

    Anyway, the almost open leak from the vacuum pump was causing the excessive smoking. Thanks TDR, and Melchert AutomobilJonathan.
    Last edited by KrisKringle; 09-04-2012 at 01:47 PM. Reason: Bad english
    ,,The Dodge in Deutschland'' 2001 Ram 2500 Cummins Diesel, 5-Speed. as of 08/2015, 280.000 km.
    Definition of Continuous Improvement: "If it ain't broke, Fix it until it is"
    http://kriebelrestauration.de
    der Dodge in die Alpen:
    https://www.dropbox.com/s/8u8uktk7dk..._4271.JPG?dl=0

  4. #4

    User Info Menu

    I know a disconnected or leaking vacuum line can really cause a lot of blowby vapor, and also causes oil consumption if you keep driving it that way.
    '98.5 Club Cab 2wd SWB, Garrett BB Stage 3 turbo, Polydyn tubular header, Jammer I injectors, 5" exhaust
    Truck 2: '96 CC 4x4 LB, 5-spd 3.54 LSD, PDR 175 pump, Hybrid 35/40, DDP Stage IIs, SB 13" Clutch 472,344 mi.

    In memory of Rob Hanson- July 2005
    and Nowel "HVAC" Thomas- Dec 2003

  5. #5

    User Info Menu

    I don't understand how a vacuum leak can cause this? Does the vacuum pump pull a vacuum on the crank case?
    01 2500 HO 6 speed QC SB, 4x4,4.10 LSD, Gear Vendor, Magtec diff., SPA Guages, UTE bumper, Bob V kit, BD exhaust, DSS steering&adj.track, XM Satilite, Gem Top, Trailer Mirror Swap, VulcanKit, LP on Frame, Neo Synthetics, Optima Dual Marines, RV275's, Bilsteins, Balance Masters, Fluid Amp, GDPfilter.

  6. #6

    User Info Menu

    I was wondering the same thing. I'm sure someone will let us know but my guess is that the pump discharges into the crankcase so a bad leak would cause a greater air flow into the engine base. bg
    2006 3500 Silver Sport, DRW.

  7. #7

    User Info Menu

    Lightbulb

    Quote Originally Posted by B. G. Smith View Post
    I was wondering the same thing. I'm sure someone will let us know but my guess is that the pump discharges into the crankcase so a bad leak would cause a greater air flow into the engine base. bg
    That's right. If you look behind the pump, there is a braided line that goes to the crankcase, that is the oil feed. However, FWIU, the exhaust from the pump goes into the crankcase, I guess with the 'drain' oil? Normally the system is 'closed. ' When there is a vacuum leak, all of the 'exhaust' from the pump ends up in the crankcase, adding to the volume of air already being displaced by the descending pistons. . . increasing oil consumption, as well as blowing a ton of air and oil out of the breather. . . HTH Jonathan
    Last edited by KrisKringle; 09-07-2012 at 01:45 PM.
    ,,The Dodge in Deutschland'' 2001 Ram 2500 Cummins Diesel, 5-Speed. as of 08/2015, 280.000 km.
    Definition of Continuous Improvement: "If it ain't broke, Fix it until it is"
    http://kriebelrestauration.de
    der Dodge in die Alpen:
    https://www.dropbox.com/s/8u8uktk7dk..._4271.JPG?dl=0

  8. #8

    User Info Menu

    I will check that out, mine started all of a sudden a week ago when i towed my 5er on a 200 mile trip, all flat, got home and was putting it away, and as i was idling to disconnect trailer, there was smoke flowing from under the truck, i thought thats it, she is blown with 169k on the clock. i tried the switching from defrost to floor to vent and it worked, but may not be an accurate way to check vacuum pump.



    , thanks for the info.
    2001 2500 QC, Auto,4x4, Edge comp. Raptor. big line kit. RSD 5"exh.ISSPRO,2lo kit, RV275's,HX35

  9. #9

    User Info Menu

    That braided line has oil presure to lube the vacuum pump right off the oil galley the drain is in the front into the gear hsg

  10. #10

    User Info Menu

    I got a closer look at my lines and mine was exactly the same. i replaced it, and it does seem to be alot less smoke, i guess it was leaking although i could still change from floor to defrost etc. seems to switch quicker.
    2001 2500 QC, Auto,4x4, Edge comp. Raptor. big line kit. RSD 5"exh.ISSPRO,2lo kit, RV275's,HX35

  11. #11

    User Info Menu

    Quote Originally Posted by EForbes View Post
    I will check that out, mine started all of a sudden a week ago when i towed my 5er on a 200 mile trip, all flat, got home and was putting it away, and as i was idling to disconnect trailer, there was smoke flowing from under the truck, i thought thats it, she is blown with 169k on the clock. i tried the switching from defrost to floor to vent and it worked, but may not be an accurate way to check vacuum pump.

    , thanks for the info.
    Even with a leak in the lines, the pump can supply enough vacuum for the controls to work. . . I thought the same thing. I hammered on the truck with about 2 tons of roll-roofing in the bed. . . hills and curves, and a lot of shifting gears. Suddenly there was smoke from under the hood from my 'no-drip' breather. Oh, yeah, and oil everywhere. . .
    ,,The Dodge in Deutschland'' 2001 Ram 2500 Cummins Diesel, 5-Speed. as of 08/2015, 280.000 km.
    Definition of Continuous Improvement: "If it ain't broke, Fix it until it is"
    http://kriebelrestauration.de
    der Dodge in die Alpen:
    https://www.dropbox.com/s/8u8uktk7dk..._4271.JPG?dl=0

  12. #12

    User Info Menu

    Quote Originally Posted by KrisKringle View Post
    Even with a leak in the lines, the pump can supply enough vacuum for the controls to work. . . I thought the same thing. I hammered on the truck with about 2 tons of roll-roofing in the bed. . . hills and curves, and a lot of shifting gears. Suddenly there was smoke from under the hood from my 'no-drip' breather. Oh, yeah, and oil everywhere. . .


    Thanks again, there was noticeablly less smoke last night, i will take it on a drive later on after work, and i will be very happy im sure.
    2001 2500 QC, Auto,4x4, Edge comp. Raptor. big line kit. RSD 5"exh.ISSPRO,2lo kit, RV275's,HX35

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •