Bottom End Rattling

[00Xplorer]

I bought a 2000 explorer xls v6 about 3 months ago...about 3 weeks ago a strange rattle started coming from the bottom end somewhere. It appears about 15 seconds after a cold startup and never goes away. It does not get louder or faster with RPM.. also i can barely hear the rattle when its in drive or reverse..its louder in park or neutral..I checked the entire exhaust and i know its not that...it sounds like it is coming from the front of the oil pan or close to it...let me know if anybody knows....thanks

 

[waskly]

chain guild broke?

 

[swetrid]

4.0L sohc or OHV engine?

 

[00Xplorer]

OHV....125k miles

 

[swetrid]

OHV engines had what they call a carbon knock. It builds up carbon on the pistons and causes almost like a knock/ bearing noise at idle. Ford had you decarbon the engine and then road test at 4000rpm for like 5 miles. They told you to drive at least 4000 rpm once everytime you drive vehicle to help stop the carbon buildup. The noise won't hurt anything.

 

[00Xplorer]

i think thiss is a diffrent sound...its a rattle and dont sound like the bearings...kinda like marbles bouncing around...and i was told it was not the oil pump

 

[swetrid]

Thats it! They list the noise as marbles back in the Ford literature, I just couldn't remember the word.

 

[00Xplorer]

so i just seafoam it or somthing and that should be it??

 

[BobWiersema]

Read this.

http://www.enginebuildermag.com/Art...ation_for_ford_vehicles_with_40l_engines.aspx