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Re: what causes a tapping noise when the engine is...
Lifters, push rods and rockers arms. That's what does it. To check lifters. Start the engine and get it up to operating temperature. Put a half quart of transmission fluid in it and let it run. If the tapping goes away, let it run for about 30 minutes. Drain the oil and change the oil filter. Refill it and add some oil treatment first, lucus, slick 50.. what ever you prefer. If the noise doesn't go away. Look at the rocker arms and push rods, they should be polished, replace them as needed, I would still put the additive in.
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Disconnect the camshaft cover grounding strap.Right side of engine.
Remove ignition module, 4 bolts , and disconnect the electrical connection to it. Pull straight up to remove.
Remove 4 spark plugs.
Remove the coolant pipe bracket.
Remove the fuel line bracket.
Remove the 12 bolts holding down the cover, then pry up around the edges GENTLY to remove. You might want to use a rubber mallet at this stage, just don't overdo hitting it, its cast aluminum..
The gasket around the edge and around the spark plug holes don't need sealant, the new design does away with this.
Now would be a good time to check the wear on the Teflon timing chain shield between the camshaft sprockets.
Installation is in reverse order.
Camshaft cover bolts : Tighten to 89 INCH pounds.
Camshaft Ground Strap Bolt : 89 INCH pounds.
Spark Plugs : 15 FOOT pounds.
Ignition coil to camshaft cover bolts : 71 INCH pounds.
Coolant pipe AND Fuel line bracket bolts: 89 INCH pounds.
A rhythmic metal on metal noise in an engine usually follows a classic rule: valves tap and pistons knock. If the noise is rhythmic with the speed of the engine and incrementally increases when the engine speeds up, then it is one of these two issues. All you need to answer in this case is whether your noise is a tap or a knock. On the other hand, if the clanging sounds more like an old diesel engine and increases in volume when the engine accelerates, then the problem is pre-ignition. If the problem is simply pre-ignition, then you will need to check your ignition system, including the knock sensor, crank sensor, and all your spark plugs and coils. This is the simplest thing to do first. Unplug each coil one at a time to verify that the engine loses power for each one. Valve tap can be caused by lifters or a broken valve spring. To diagnose this, you need to remove the valve cover and check the lifters. Are any loose when you try to move them up and down by hand? Engine knock signals that your engine needs to be rebuilt with new piston rods and bearings. It is not a good idea to drive very long with either condition or you could end up causing more damage and get stuck on the side of the road.
As crazy as it sounds, I don't see why not. Based on my limited knowledge of a 2002 L200, the power steering is run off the back of the camshaft and the water pump is driven by the timing belt. The only things the serpentine belt runs are the A/C and alternator. Obviously you won't make it very far running without an alternator, but at worst you kill your battery. Serpentine belt on a 2.2l 4 cylinder 2002 L200 has nothing to do with the water pump or power steering pump.