My 03 Dodge Durango 4.7L engine was blowing white smoke from exhaust. Took the heads off and had them done at a machine shop. Assembled original timing chains, tensioners and guides and align chains per requirements. Upon first startup engine ran fine but was knocking sound from front of engine. Removed valve covers and replaced 16 lifters upon startup same problem. Took apart timing chain cover and found drivers side timing chain loose. I am not sure where to go to next. Need help.

Answer:It sounds like one of the timing chain tensions is either faulty or was not installed properly. That is why the chain is loose and banging around. When using the old tensioners, you probably have to re-seat it, then after the chains are on, release it so there is tension on the chains. You would not have to seat a new tensioner, but you would have to release it once the chains are installed.

The other possibility is that one of the tensioners is just bad- is binding up and would need to be replaced. A timing chain tensioner that has been in a certain position for many thousands of miles can be bound up and stuck in that position.


Leave your comments

Post comment as a guest

0

    Comments
    Subscribe To These Comments-----   

    • No comments yet.

    Latest Articles

    Chevrolet Blazer Lost Power ...

    2000 blazer 4x4 lost power to drivetrain going down the ...

    Dodge Durango Timing Chain ...

    My 03 Dodge Durango 4.7L engine was blowing white smoke ...

    2002 Chevy Blazer Keeps ...

    My 2002 blazer keeps dying on me when I am driving, and ...

    1996 Lumina Dies Looses ...

    1996 Chevy Lumina 3.1 L. I have good fuel pressure,spark ...

    Silverado Won't Start Cold

    My 1992 Silverado 6 cylinder turns over but will not run if ...

    How Things Work

    Positive Crankcase Ventilation - PCV Valve System

    A crankcase ventilation system is used to consume crankcase vapors in the combustion process instead of venting them to atmosphere. Fresh air from the throttle body is supplied to the crankcase, mixed with blow by gases and then passed through a PCV valve into the intake manifold.

    Read more...

    Common Engine Codes

    Code P0101 or P0102 Mass Air flow Sensor

    The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates deceleration or idle.

    Read more...