Cummins Blow Buy

[James Craddock]

I have a 1993 Dodge D250 with a 5.7L Cummins engine it I get a real bad exhaust smell when at Idle and it kind a smells like oil burning . Would a vavle adjustment stop the exhuast smell or do I have a more complex problem. If anyone is has or is experincing this or has fixed the problem please respond thank you

James Craddock

[topradioguy]

If you need any help with a Cummins engine, you could call Sam's radio show on saturday mornings between 9 am & 11 am eastern time and ask Dave McBride who is the training director for Cummins South.

Reach the radio show @ 1-800-355-3597

Thanks

[gearhead748]

If the car dealer can't fix it look in the phone book. Look for a cummins shop thats all they work on. the reasen i say this is because i have 27 years in trucking and I have found that a cumming service center. is the place to go.I had one was a big cam 400 that had a bad injecter and the volvo truck dealer couldn't find why it smoked so bad. the cummins shop found it in five min. and I had a m11 and a m14 . I had so much trouble with the truck dealer getting things fix now I go right to great lakes cummins .better yet check this out www.cummins.com they can get you to a cummins shop. it could be the injecters are dribbling at bace idle whats the milage on it ? do you have a way to pick the idle up to 800 rpm and and see if it goes away that could be the trouble

[jasf316]

it sounds like eithr 1. you have a stuck injector, 2. a bad injection pump, 3. you need to have your valves and injectors adjusted. Another thing that would cause excessive smoke is a dirty air filter. how long ago was it replaced, what about your fuel filter and/or fuel water seperator? How do those look and how long ago were they changed? hope all of this helps.

[Rich Y.]

There are a few things to look at with the Cummins in your truck.
First, have a Cummins shop check injectors, delivery valves.
Second, Have them check the pump timing on your truck, these engines are known for the timing slipping over time. I don't know if you have an auto or standard, but if you have an auto, have the timing set at 15 degrees, this will also give you a little better fuel mileage too.
Third and most important. The dreaded killer dowel pin. This is a dowel pin in the upper left corner of the timing cover that eventually works it's way out of it's hole and deposits itself into the timing gears on the front of the engine, and sometimes destroys the gears, or the engine itself. Best case scenario, the pin will only fall out, wedge between the gears and case and crack the timing case, causing a severe oil slick under your truck.
This is a very real problem with these Cummins engines in dodge trucks from 1990-1998.5 otherwise known as the 12 valve engine. The new 24 valve engines use a different timing case configuration so the pin does not fall out.
Hope this helps
Rich