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Gary
Gary, ASE Certified Technician
Category: Ford
Satisfied Customers: 955
Experience:  Senior Technician
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Have a 1996 f0rd f150 5.0 engine has knocking noise have

Customer Question

have a 1996 f0rd f150 5.0 engine has knocking noise have replaced cam lifters and push rods still it knocks
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: right side
JA: Are you fixing your F150 yourself? What have you tried so far?
Customer: oil and filter change new lifters and push rods
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 8 months ago.
Category: Ford
Expert:  roy replied 8 months ago.

good evening my name is ***** ***** I will assist

are you sure it was valve train related???

could be a rod bearing???

Roy

Customer: replied 8 months ago.
the noise is from
top right side
Customer: replied 8 months ago.
the noise is from top right side
Expert:  roy replied 8 months ago.

ok, then the next thing you ned to check is the valve guides. if they are worn, the valve will move side to side and give a noise like a valve tap.

Roy

Customer: replied 8 months ago.
I opened the valve cover and observed closely as valves close and open no difference from left side
Expert:  roy replied 8 months ago.

this you will not be able to tell by visual inspection. you need to remove the rockers and push rods and then manually try and move the valves around

Roy

Customer: replied 8 months ago.
ho do I move them under spring tention
Customer: replied 8 months ago.
how not ho sorry
Expert:  roy replied 8 months ago.

I put a large socket over top of the valve spring and put an extension on it and try to move it around

Roy

Customer: replied 8 months ago.
spring moveslightly side when I use much force
Expert:  roy replied 8 months ago.

in 5 minutes, you removed all rockers and did this test????

did you check all the valves???

Roy

Customer: replied 8 months ago.
I had opened the top covers and timing chain covers so all are the same
Expert:  roy replied 8 months ago.

timing chain covers???? you posted 5.0 engine. is this a 4.6???

Customer: replied 8 months ago.
no sir its a cover then I tried leak down test and the only slight thing I could nt understand is that when I turn and lock valves for each cylinder a leak sound could be heard from the bottom and when I slightly open the valves and leave it free it would lock by itself and crate compression
Expert:  roy replied 8 months ago.

what engine do you have?????

Customer: replied 8 months ago.
5.0
Customer: replied 8 months ago.
Thank you, i'll wait
Expert:  Gary replied 8 months ago.

Hi Daniel,

Have you had somebody else listen to the engine?

As Roy has pointed out, a worn valve guide may give you this noise, but it is sounding more like a rod bearing.

A leak down test can only be performed at TDC end of compression stroke, unless the rockers are removed.

Was there any abnormality noted with the parts you have replaced?

Did lifter preload seem correct for each valve when you fitted the rocker arms?

Gary

Expert:  Gary replied 8 months ago.

Hi Daniel,

Do you need any further help?

I hope my advice has been of assistance to you.

Kind regards

Gary

Expert:  Gary replied 8 months ago.

Hi Daniel,

Do you need any further help?

I hope my advice has been of assistance to you.

Kind regards

Gary

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