Question about 1992 Ford F150 SuperCab

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Had oil changed on 6-2-08 and now have a knocking sound in the motor

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  • chaney7980 Jan 18, 2009

    My oil light was at one time going on and off. My husband was told that as the car warmed the oil light would cease the blinking on and off. It did. But then three days ago I heard a knocking sound. I took the truck for a oil change and it was still knocking. when i hit the hwy the knocking became louder and louder until the truck completely stalled out on me. I was told it could be a motor problem. that since the oil was so low, oil was blocked to my motor and it may have to be replaced.

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Wrong oil filter. The one that was installed didn't have a anti-feed back valve in it. Most of the newer motors need that valve in the filter to keep oil from draining back into the eng oil pan.
Fast lube places don't stock the best of filters. Only their own or the cheapest ones. Not what the vechile makers call for. Get with your BBC or Consumer Agency to see what they say.

Posted on Jan 24, 2009

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Since the knocking started before the oil changed, it definitely isn't due to the oil change or a problem with the oil. Not sure who told your husband that a monitor problem would block oil going to the engine due to an oil light coming on. Sounds like someone trying to scam you or just didn't want to do some tough diagnostics that day. An oil filter with or without an anti-feedback valve won't cause that problem, either. Pinging -possibly- but not outright knocking. You either have, as chris07551 said, a bad main bearing, or you may have a bent pushrod. If the oil light was on, that means most of the top end of the engine was likely not oiling correctly. Most damage due to low oil happens at the top first, but the worst damage usually occurs at the bottom, if that makes sense.

To clarify my confusing statement: The damage at the top is most likely, but tends to be the least serious. The bottom is where the components that take the biggest beating are: The main bearings, journal bearings, piston rods, piston rod caps and crank. Usually low oil will "spin" a main bearing... in effect melting it down and causing it to seize up, binding your engine. In some cases it can simply cause them to break apart, which leaves a gap between the journal they ride on (a part of the crank shaft) and the piston rod and cap (which goes around it). This can result in a bad knocking.

What's more, the more you drive it, or try to drive it, or even try to start it, the more damage you are doing. If the damage becomes severe enough you'll be doing more than a rebuild, you'll be needing a new crank, and possibly a new piston rod and cap.

In extreme cases, you can break the cap away from the rod and put the rod through the bottom of your oil pan. I saw this happen to an Aspen that I was dragging when it blew a seal on the track. Tons of fun, and very expensive toy to replace.

Good luck with that! Let us know how it turns out!

Posted on Feb 08, 2009

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Nothing to do with the oil sounds like you did a big end bearing

Posted on Jul 21, 2008

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wikkidd420
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SOURCE: knocking from motor

alot of the time, the carbon in the old oil makes up the gaps in worn pieces of your engine, and when you change the oil, it washes that carbon away. To get by, you can add some Lucas brand oil stabilizer, just drain a quart of oil and add the lucas. It is much heavier than the oil, so it helps take up the space left by the carbon, but it IS NOT A FIX. It will just help you get by until you can make the proper repairs. Any time you have a knock, you are usually doing damage to the motor every time you crank it, so use it as little as possible until you can have the motor rebuilt. Let me know if this helps :)

Posted on May 19, 2009

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Posted on Jan 02, 2017

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