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Ford Repair/top end noise

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Question
QUESTION: i have a 99 expedition with a 4.6 windsor.i did a head gasket replacment,the vehicle is running smoothly but i have a loud knocking noise in the valve cover area on the left bank.any ideas as to what it could be?

ANSWER: faulty lifters would be my guess,, did you replace them when you did the head or did you use the old lifters ??

---------- FOLLOW-UP ----------

QUESTION: i did not take the head apart,i removed it replaced the gasket and put them back on

Answer
why did you replace the gasket ?? oil leak ???? the other possibility is that the timing chain tensioner isn't tightening up all the way. I know this sounds weird but, drain 1 quart of oil from the engine and replace it with 1 quart of marvel mystery oil and take it for a trip up the highway and recheck

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brian

Expertise

I can help you to answer most vehicle questions dating from 2000 and on. cars and light trucks relating to ford electrical. air conditioning, heating, brakes, steering and almost all driveabilty concrns. I am well versed in the area of Fords new sync/ford and lincoln my touch systems.

Experience

I have worked for Ford for the last 15 years and recently received my master technician status.

Education/Credentials
Ford master tecnician. Ford certified in steering, suspension, brakes, climate control, electrical and driveability concerns. light transission concerns. as well as certifed in Fords new sync/Ford/Lincoln mt Touch systems

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Ford master technician

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