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Old 05-11-2011, 01:32 PM
nashvegas nashvegas is offline
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Default Engine Knocking - 2.5l 98

Hey guys, I have been trying to track down a knock from under the hood. I think it is coming from the top end, but I have had two friends with more experience listen and they feel like it is coming from the bottom.

How would you go about diagnosing engine noise? Stethoscope?

Where do you listen and what does it mean if you hear something?

'98 2x4 2.5L 5 speed xlt | Primer Black (for now)
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Old 05-11-2011, 06:22 PM
ObsoleteE ObsoleteE is offline
I'm an F-18, bro
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Default Re: Engine Knocking - 2.5l 98

Any chance on uploading a video of the knock?
1999 B2500 5 Speed
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Old 05-12-2011, 04:26 AM
Botta Ranger Botta Ranger is offline
Ford Tough
Join Date: Jan 2011
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Default Re: Engine Knocking - 2.5l 98

Rod knock is most noticeable:
On startup - no oil to take up extras space then quiets down when pumped full of thick cold oil.
Picks up again when oil heats up and thins.
At neutral throttle (like cresting a hill). Accelerating or decelerating loads the bearing on one side. At neutral throttle its free to rattle back and forth.
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Old 05-17-2011, 11:07 PM
Jwhite04 Jwhite04 is offline
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Default Re: Engine Knocking - 2.5l 98

A loss of oil pressure is a sign of bearing failure down under
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2.5l, engine, noise, stethoscope

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