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Thread: 120bhp 8v CDTI tappet noise on new engine

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    Default 120bhp 8v CDTI tappet noise on new engine

    Hi all,

    Is it normal to get a pretty heavy tappet noise when accelerating on a 2007 1.9 CDTI 120bhp 8v engine?

    Regards and thanks

    StratApproach

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    Regular Member Gsi3.2's Avatar
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    not normal at all....sure it's tappets and not diesel knock??

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    Thanks for getting back to me quickly.

    Just been reading up on Diesel Knock - Brilliant - I think your right.

    I've spent the last few days looking up on the internet key words like clatter and not once did it mention Diesel Knock.

    I'll get the car to a garage next week.

    Thanks again.

    StratApproach

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    Regular Member Stuarty's Avatar
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    What is diesel knock

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    Regular Member Gsi3.2's Avatar
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    Diesel fuel is intended to ignite instantly upon injection; the measure of this property is the cetane rating. Gasoline is intended to resist ignition until the spark plug fires; the measure of this property is octane. In either type of engine, uncontrolled ignition with multiple flame fronts causes engine damage/knocking. In the case of diesel, if the fuel doesn't ignite upon injection, a pocket of fuel is formed that later ignites due to the pressure rise caused by the main burn. The results are the same as gasoline igniting from the pressue rise before the main burn spreads to it. The multiple flame fronts collide violently, you hear a knocking sound and the engine is subjected to enormous forces that cause piston, ring, valve and connecting rod damage. The weakest component breaks first.

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    Administrator plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

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    oooh look at son getting all technical

    Nice descripton there son, now i know wot it is as well

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    Regular Member Stuarty's Avatar
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    Cheers for the info bud sounds pretty serious is it a timing issue or more of a prob caused by fuel delivery,injectors,feulpump etc?

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    timing really, but also poor injector spray pattern...caused by either incorrect installation height or damaged valving..

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    Quote Originally Posted by plasma View Post
    oooh look at son getting all technical

    Nice descripton there son, now i know wot it is as well
    Anorak fully on Dad..

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    I think quite a few 1.9 8v's are like it, my dads 1.9 CDTi 120 8v sounds quite tappity when accelerating, it's 18 months old now and has been checked out.

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