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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
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Toyota Hilux LN 166: Hallo! Mine is toyota hilux LN 166. What

Customer Question

Mine is toyota hilux LN 166.
What could be the cause of the engine knocking that emanates from the top cover?
E.K.Kerich ***@******.***
Submitted: 2 years ago.
Category: Toyota
Expert:  Toyota Service replied 2 years ago.
Hello. Welcome to Just Answer. Please allow me to assist you.
A knocking noise under the top cover could be several things.
Most commonly, improper valve clearance is the cause; this can come from worn camshaft lobes, worn valve seats, etc.
There are other things that can also cause this, like lack of oil pressure to that area due to oil pump issues, worn cam lobes, broken valve springs, atc.
The recommendation I have for you would be to remove the top cover (if you have mechanical skills). Look for wear on the camshaft lobes.
Also look for sludge buildup. SLudge is a thick grease that can build up and cause loss oil proper oil distribution. This will cause the cam lobes to wear very rapidly and cause a knock.
If you have any questions on my input, please feel free to reply
Customer: replied 2 years ago.
I will carry out the test you have recommended as appropriate.
Customer: replied 2 years ago.
I will also get back when done.
Expert:  Toyota Service replied 2 years ago.
Ok. I look to hear back from you