How to repair a noisy Car Engine
The rattling Noise from the upper parts of the engine, that confuses you of whether it's from the timing chain, or adjuster, or the lifter cups on the cylinder head. At times you'll make an educated guess that it's from the camshafts assembly.
The noise have not stopped, even after you've replaced almost every parts, the only thing you've not replaced now is the cylinder head.
And it's cleared that this noise is not from the down part of the Engine. Because when we rev up the Engine, there's no sign of the camshaft, or its bearings are faulty, you're totally convinced that the noise is from the upper end of the Engine. What then makes the Engine noisy?
What's the cause of a noisy Engine?
The main cause of a noisy Engine is Engine oil...
Yes, lack of regular oil and filter changes, especially when you are using Engine oil of poor quality. This type of oil not only loose their lubricating power easily but also burn to leave scale deposits inside the Engine. Second to this is excessive overheating
The burnt particles of this Engine oil will block the oil gallery of your Engine, making it difficult for oil to flow. Then the engines suffers lack of oil, hence bearing damages, that will eventually change the sound of your Engine.
What do I do if I have a noisy car Engine?
The first step is to detect and confirm the source of the noise, is it from the upper end of the Engine, that's the cylinder head side. And you've confirmed that it's either from the camshaft or timing chain or it's adjuster.
Don't rush to replace the parts you've noticed to be faulty without solving what's responsible for that.
Like I said earlier, when an engine suffers from an optimal lubrication, nothing will help it's bearing from making noise, even if you install brand new ones. Engine oil is important to the Engines just as blood is important to humans.
You must first of all clear and free up the oil gallery of the Engine to ensure free flow of Engine oil to all bearings.
How To Clean the oil gallery of a noisy Engine
Maybe it's been long since you've last change your car's oil and oil filter, and the Engine oil you used is not that one of high quality. This noise from the upper end of the Engine now might be do to that lack of oil changes, but even after you've changed the oil and filter now, the noise didn't go away.
Maybe the oil gallery is already blocked by the deposits from the burnt oil.
Step by step process of cleaning the oil gallery
1. Wash and clean the oil pump filter: if the oil pump filter is blocked, oil pump pressure will be reduced. You'll easily notice this when the red oil light illuminated on your dashboard screen. Clean it thoroughly, but if you noticed that the net will not work even after cleaning up, kindly replace it.
On fixing it, it'll enhance the oil pump power. This alone might totally solve your problem
2. Clean and free up the holes of the camshafts and cylinder head oil holes.
When there's no changes after washing oil pump filter, you'll go into the deep job of freeing oil holes of camshafts and cylinder head. Take your time. Carburetor cleaner is effective in this job, as it penetrates to dissolve all the hidden burnt oil deposit in the holes. Force air to those tiny holes one by one till you're completely satisfied that air can pass through the Holes without much pressure or efforts.
Now that you're sure that Engine is free of all odds, replace all the damage parts and bearings. When you do this perfectly, the noise will totally disappear and the Engine will work with it's normal cool sound.
Please, ensure that the VVTi camshaft has not spoiled, also test it's sensor as they can also contribute to the head noise of an engine.
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