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I have had an engine knock in the lower part of my engine

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for last couple month, after...
I have had an engine knock in the lower part of my engine for last couple month, after running on low oil. after replacing oil knock got better, but has come back and seems to increasingly get worse. When I rev the engine over 2000-2500 rpm the engine knock gets more noticeable.
Submitted: 1 month ago.Category: Ford
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Answered in 5 minutes by:
12/1/2017
Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago
Mike V.
Mike V., Auto Service Technician
Category: Ford
Satisfied Customers: 26,251
Experience: 25 years experience on all makes and models, Licensed NYS Inspector.
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Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago

Is the engine misfiring or is the check engine light on at this time?

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Customer reply replied 1 month ago
No, engine runs fine, it just sounds terrible under strain. The check engine light has never come on.
Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago

Ok

Usually a knocking is an indication of a connecting rod with to much play. This isn't really uncommon after it's been run low on oil. What happens is the bearing material around the crank or the crank is damaged. This allows for some movement that shouldn't be there which in turn causes the knocking because the rod is hitting on the cylinder wall. The oil pan will have to be dropped and measurements taken to determine which one is causing the noise and if it can be repaired by simply replacing the bearing.

Please let me know if there is anything else I can do to help.
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Customer reply replied 1 month ago
What tools are needed to check which rod is damaged? How can I find out if my crankshaft is damaged? how difficult is it to replace a rod bearing on your own?
Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago

Generally you will need to use feeler gauges to see how much play there is in between the connecting rod and it's journal. Side to side clearance is the indication which rod is causing the noise. There is a limit to how far they can move. Then you would remove the bearing cap and the bearing which stays on the cap most of the time to inspect the crank for any damage. If it's scored, then the crank would have to be replaced. If it's not, then the bearing would have to be replaced. You have to use plastigauge to see what size bearing would go there. Most of the time its going to require an oversized bearing to make up for the difference.

If this is something you have never done, this isn't really a beginners job to be honest. Taking the oil pan off to get to the bearings will prove pretty difficult to begin with.

If it is something you are going to attempt, I am going to suggest a subscription to alldata DIY. This will have the tolerances for the measurements, it will also include the torque specs and sequences. Plus removal instructions for the pan

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Customer reply replied 1 month ago
Although this is a task I haven't completed before I will be working with guys who have done similar tasks and I have had to replace my oil pan before. If there haven't been metal shavings in my oil while replacing the oil, is it most likely just the bearing around the rod and not the crank?
Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago

Sorry to say there isn't really any way to know without looking. The oil filter would take out the metal filings. They are very small. Tolerances are usually in the .000 range. So close it doesn't take much to take them out. Of course if the crank is scored it becomes a much bigger job.

Glad you have some experienced people to help you out with it!

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Ford Mechanic: Mike V., Auto Service Technician replied 1 month ago

Please let me know if there is anything else I can do to help.
Also, kindly remember to rate my answer.
Thank you so much!!

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