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Dale Stockstill
Dale Stockstill, Automotive Diagnostic Technician
Category: Car
Satisfied Customers: 1238
Experience:  40 years of Automotive Technical Knowledge, Teacher, Diagnostic Specialist
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have replacedrod BEARINGS RINGS lifters R/arm..knurled PISTONS ENGINE

Customer Question

HAVE O3 DISCOVERY THAT HAS A TAP NOISE AFTER BRIEF WARM UP. HAVE REPLACED
ROD BEARINGS RINGS LIFTERS R/ARM ASSBY KNURLED PISTONS ENGINE HAS TAP NOISE.
NOW HAVE STRIPPED COMPLETELY CAN SEE NOTHING WRONG.
ANY SUGGESTIONS???????

PLEASE HELP [email protected]
Submitted: 6 years ago.
Category: Car
Expert:  Dale Stockstill replied 6 years ago.

Hello,

 

My name is Dale.

 

I would be happy to try and help you. Please let me know a bit more about the history on the engine and how long ( how many miles) etc.. since the major repair. I have a pretty good idea of what is wrong but I also need you to identify which engine you have,

etc.

 

I will wait for your response.

Sincerely,

Dale

Customer: replied 6 years ago.

MILAGE IS 97,000 2003 4.6 CLEAN INSIDE

WORK WAS JUST DONE BUT STILL HAS NOISE NOW WE HAVE ENGINE OUT OF CAR AND STRIPPED DOWN

Expert:  Dale Stockstill replied 6 years ago.

Thank you for the information.

 

I am not quite sure why you pulled the engine out without identifying where the noise was or is coming from. If you feel it coming from the top, the first thing I would be looking at is the rocker arm shafts. The EXTREME pressure pivot points in the valve train, etc. I mean you could have a camshaft that has a worn lobe and crating a problem but I do not understand why you pulled the engine out of the vehicle if you really feel the problem is on the top of the engine?

Sincerely,

Dale

Customer: replied 6 years ago.

REPLACE ROCKER ARMS LIFTERS ROD BEARINGS ,RINGS IN CAR STILL SAME NOISE HAVE PULLED ENGINE TO SEE IF LINERS IN PLACE THEY ARE.

Expert:  Dale Stockstill replied 6 years ago.

OK, I think I get it why you pulled the engine. Have you inspected the lobes on the camshaft? Could have a broken valve spring. Just thinking in my mind and writing it down for you. Do you know how much taper is in the cylinders. I know you knurled the pistons but a taper in a cylinder or a stuck wrist pin can cause a similar sound. Do you know if you removed the spark from one particular cylinder when the engine was running if the noise would go away or change? I would have liked to walk you through some tests before you pulled it down but it is to late now. So I guess you will have to inspect everything and check all measurements and then by process of elimination hopefully find out what was causing the noise.

Sincerely,

Dale