nissan primastar 20ltr dci m9r 780 - engine knock

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Tue 18 Feb 2014 21:07
nissan primastar 20ltr dci m9r 780 - engine knock - r1gas

help apreciated my van has what

sounds like a top end knock .i had it towed to a garage they striped it said the tubo had gone then the cylinder head so replaced with new ones checked timing chain built bak up by them problem still there now there saying injectors but cant be sure even after having them checked has anyone any ideas i have too much money in it now as i have just had new cluch and brakes done as well HELP PLZ

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Wed 19 Feb 2014 13:06
nissan primastar 20ltr dci m9r 780 - engine knock - Peter.N.

Injectors can cause knocking if they are leaky but it usually a quite distinctive noise which usually increases with throttle opening. What sort of a knock is it and under what circumstances does it do it?

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Wed 19 Feb 2014 17:29
nissan primastar 20ltr dci m9r 780 - engine knock - r1gas

its knocking from startup and speeds up as you excelerate we have had the injectors to a specialist ,he says none of them are that good we changed the head because the cams looked worn it went a bit quieter but the same problem is there . Im just relucktent to spend another £700 on new injectors for a guess

the pistons seemed fine when head was off at this moment they are swaping injectors about to try and isolate the problem

the knocking sounds like tappits but just in one area at the top but we will see if it moves by swaping the injectors about or not

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