I have had my 02 durrango for going on 4 yrs now and it has the original 4.7 just did the timing and everything is lined up I am aware it's an interfance engine and all but I have gotten it to where it will crank but when it goes to try to start sounds like a gun going off in the engine bay do not want to assume worse and say I bent a valve
Need assistance
Silverhoedurrango
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I have had my 02 durrango for going on 4 yrs now and it has the original 4.7 just did the timing and everything is lined up I am aware it's an interfance engine and all but I have gotten it to where it will crank but when it goes to try to start sounds like a gun going off in the engine bay do not want to assume worse and say I bent a valve
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Also all sensors have been replaced as well
Before you tried to start it, did you pull it through manually with a breaker bar to check for a point of resistance? If you did that and you didn't feel anything hitting anything else, I wouldn't think that you had damaged a valve.
You might do a compression check. If the valve timing is way off I think the compression should read way low as I don't think you are going to get both valves being closed at TDC.
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It is easy to make a mistake installing the timing chain and getting it timed properly. Just having the chain on there, marks lined up and pulling the pin to allow the tensioner to extend is not all there is to it.
The chain on the opposite side from the tensioner needs to be taut when the tensioner is extended. During replacement, the camshafts are sitting in a somewhat tenuous position due to spring tension and can easily turn a tooth in the wrong direction while working on it.
The procedure is to do one chain at a time, the inner one first(passenger side/left). Align the crankshaft gear mark with the timing mark and the same with the camshaft gear. Then install the chain. You then want to put the offside under tension. I use a wrench on the camshaft bolt and a large pair of channel locks and a rag on the crankshaft end. I try to turn the crankshaft counter-clockwise while holding the camshaft steady. If you can turn the crankshaft some, you will find the chain is one tooth off as the camshaft timing mark is still aligned, but the crankshaft mark has moved.
If the mark has moved, you turn the crankshaft clockwise slowly until you can make the chain skip one tooth. Turn the crankshaft counter-clockwise to tension it again while holding the camshaft in position. Insure the timing marks align properly at both locations then pull the tensioner release pin. When doing the second camshaft timing chain, you will turn the crankshaft in the opposite direction that you did for the first chain(clockwise first) and you need to make sure that all the marks are aligned on both chains before you pull the second chain tensioner pin.
Its really hard to re-compress a tensioner without a press and someway to hold it so you can get a pin to hold it retracted. You might need to buy another tensioner. Hopefully not two.
The chain on the opposite side from the tensioner needs to be taut when the tensioner is extended. During replacement, the camshafts are sitting in a somewhat tenuous position due to spring tension and can easily turn a tooth in the wrong direction while working on it.
The procedure is to do one chain at a time, the inner one first(passenger side/left). Align the crankshaft gear mark with the timing mark and the same with the camshaft gear. Then install the chain. You then want to put the offside under tension. I use a wrench on the camshaft bolt and a large pair of channel locks and a rag on the crankshaft end. I try to turn the crankshaft counter-clockwise while holding the camshaft steady. If you can turn the crankshaft some, you will find the chain is one tooth off as the camshaft timing mark is still aligned, but the crankshaft mark has moved.
If the mark has moved, you turn the crankshaft clockwise slowly until you can make the chain skip one tooth. Turn the crankshaft counter-clockwise to tension it again while holding the camshaft in position. Insure the timing marks align properly at both locations then pull the tensioner release pin. When doing the second camshaft timing chain, you will turn the crankshaft in the opposite direction that you did for the first chain(clockwise first) and you need to make sure that all the marks are aligned on both chains before you pull the second chain tensioner pin.
Its really hard to re-compress a tensioner without a press and someway to hold it so you can get a pin to hold it retracted. You might need to buy another tensioner. Hopefully not two.
Even if you have done the timing, it is worth double-checking that the marks are aligned correctly. Misalignment can cause valve knocks
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