merry xmas everyone,
my old man's truck is a 92 flareside with a 300 i-6, its got just about 200k miles on it, its been starting to knock, when first started up for about 5 seconds then it clears up, it doesnt knock anymore after that, i know we got the right weight of oil in it for this season,the oil pump screen is not clogged up. im thinking the oil pump could be going bad.

could this be the oil pump?
or
is this a sign that the motor is due for a rebuild?



John Floyd
South Mills,NC
'86 F150 2wd 300 6
Crane Cam 260/272
stock manifolds, w/ staight pipe

 

>merry xmas everyone,
>my old man's truck is a
>92 flareside with a 300
>i-6, its got just about
>200k miles on it, its
>been starting to knock, when
>first started up for about
>5 seconds then it clears
>up, it doesnt knock anymore
>after that,

I wouldn't rebuild it yet, I would keep running it until it kept knocking all the time, or started using a lot of oil. It might go another 100 thousand miles this way. I don't know what kind of oil filter you have, but there is supposed to be a check valve in it to keep all the oil from draining back to the pan. My truck knocks a little the first time I start it up after an oil change. I've got 125 thousand on my 84' model. I need to make Old Red last until I'm done paying child support and alimoney, even then, I might just keep fixing it. I'd like to replace the rusted out body parts some day and get it painted.

I guess it depends on how fussy you are and how much money you want to spend....

LeRoy Wolff, original owner of
1984 Ford F150
300 six 3 speed with overdrive
optional dual rusted out fenders
truck's nick name "Old Red"

 

[font size="1" color="#FF0000"]LAST EDITED ON 24-Dec-00 AT 12:56 PM (EST)[/font][p]My 90 F-150 300-6 had the same problem. It would knock for a few seconds right after startup, then quit and go away. But only do it when the engine sat for a few hours. I narrowed it down to the oil filter. What was happening was, I was using the cheap FRAM orange oil filters PH8A, and after sitting all night, oil would drain out of the filter, giving that knocking at startup, just like after an oil change. That's when I found a website that took apart different filters and listed their features and compared them.
http://members.nbci.com/minimopar/oilfilterstudy.html
You'll be surprised. After reading that, I switched to Fram Tough Guard TG8A (the gray diamond plate looking can), a couple more dolars, but no knocking at startup. Probably becuase not as much oil drains back into the pan. I think I'll try a motorcraft for the next oil change. Ford has a revised oil filter insert that contains a spring and check ball that keeps all the oil in the oil filter which eliminates the start up knocking noise ... Ford Part Number E4TZ 6890 A . But at $80, I'll wait a while.

 

i was wrong the oil pump creen was clogged up, i guess there was more sludge in that motor than i thought, we flushed it with stp engine flush, it knocks no more.


John Floyd
South Mills,NC
'86 F150 2wd 300 6
Crane Cam 260/272
stock manifolds, w/ staight pipe