ok, so the constant knock ( think its a bad piston pin or a bearing ready to grenade ) is starting to drive me nuttier than squirrel poo.... so this weekend im gonna tear down the spare motor ( its a 93 7.3 idi ) and see about bearing sizes and piston bore conditions and such...anyone recomend a good overhaul kit ? looking for fairly complete-- i have new head bolts, but i still need new gaskets, bearings, rings ,timing chain, oil pump,etc...the motor thats in now ( with the knock ) has a banks sidewinder on it, it RIPS but makes all kinds of bad knocking noises. anyone point me in the right direction ? also, my "p.o.s." transmission ( its the e40d, unfortunately...) seems to work 'backwards'-- at light throttle it shifts nice and hard,( in a good way ) but under heavy throttle it shifts too soon and too soft. any ideas here ? thanks again guys !

 

No timing chain in these motors. Have you checked and made sure it is not an injector knock. If is has been knocking for awhile and has not gotten worse it would be hard for me to belive it is a bearing.

 

changed all 8 injectors for new ( not rebuilt ) "G" code injectors with no change in the knock. i have no idea what else it could be besides a bad piston pin or a bearing.

 

Hows your oil pressure with a mechanical gauge???
Cold versus warm??

When running, carefully crack each injector line one at a time listing to the motor / knock.

If you find one that changes the knock, thats the bad cylinder and would be rod, wristpin, piston or injector.

If none of them change the sound of the knock then it could be a broken glow plug tip stuck to the top of the piston.

-Enjoy
fh : )_~

 

What he said, if it has been doing it for awhile and not getting worse, I betting on a piston skirt.

 

I bought my rebuild kit off ebay for $475.00 but that is a re-ring kit. My kit had Clevitt rod and main bearings, Fel-pro gasket set minus intake/valley pan gasket and Hastings piston rings. All name brand stuff so I was pleased. The company was very good to deal with and I would recommend them to anyone looking for parts. They also have kits with cam shaft, timing gears, pistons, oil pump, ranging from my 475 re-ring kit to a 1200 dollar complete kit.


Here is a link to the re-ring kit for the 6.9 and from there you can go to there store and search for other parts.

Jeff

1983-88 Ford Truck 6.9 Diesel Engine Rering Kit 6.9L : eBay Motors (item 190386069771 end time Apr-09-10 20:58:17 PDT)

 

I haven't priced one in a while, but the international dealer used to have good prices on the complete kit.

 

It sounds like it is knocking with high oil pressure. Oil pump issue maybe?

 

Talk about a day for revivals

 

I'm laughing at myself. I was trying to answer on the 300 thread. I didn't read this thread until my answer was posted.