6.9 non turbo.

about 1200 miles on rebuild, bored, pistons, bearings, valve job, etc

going down the interstate about 70 mph and engine starts making loud noise as if a small screw or washer got sucked into a cylinder.

the noise slowly got quieter as if what ever was in there got pounded into the piston.

got it home and had a loud tick as if a lifter collapsed, but it was in time with the valve train and not as if something was stuck in the piston as it would be twice as fast.

i pulled the valve cover on the loud side and checked rockers push rods etc. everything looked to be ok.

but if i were to crack the fuel line to each cylinder at #7 the tick stopped.

i changed the injector with a known good one and no change tick still there.

Sooooo i figured something got in there and maybe went out the exhaust but damaged the piston skirt and was slapping when the injector fired.

so out it comes,

all other cylinders are fine #7 cylinder can be cleaned up with a light hone but the piston is junk.

everything above the rings is fine but the skirts are the only damaged area.

the crown is fine, no dents as if something got in there. and the flame pattern is about the same on all 8 pistons.

when i pulled the injection pump i noticed it was leaking a small amount of fuel out of what appears to be a vent hole at the bottom of it.

compression test before dis assembly 475 psi on all 8.

anyone ever see anything like this?

i have a new/rebuilt injection pump that i will be installing on this reassembly.

 

vehcial info 7.3 of 6.9

 

sorry 6.9 non turbo, it posted on the side of the picture for some reason

 

what year and did u have the little green men rebuild it for u

 

Bad piston pin or twisted rod? Don`t know.

 

aim thinking low fuel and 70mph in a 6.9 na u must be reving it up there

 

86 i rebuilt it, 28 year toyota tech.

 

would think it would have toasted the crown if it were lean.

 

diesel fuel works as lube and feul in diesel not like gas motor and bad injetor that was cloged not give enought fuel and not enought lube it got hot and some thing happen i dont think u sucked in anything my 85 has a mesh girl under the air cleaner i think it was the lillte green men geting back at u with there alein tech lol iam a hoot

 

i think when i get it back together i will use the same ip to see if the noise is still there at idle then change the pump anyway to be sure.

 

just have the pump tested pefor u put it one

 

yeah, maybe some place in orlando will have to look monday

 

have ur returned lines checked to

 

You something Joe....but a hoot, I don't think so! Your posts look like a kid puked up a bowl of alphabet soup.....spell checker and punctuation can be your friend.

The fuel lubricates the injection pump, not the piston skirts.

How did the injector look when you pulled it out? Did it come apart? Could it have washed that cylinder down?

I can't answer your question, Area 51 as I have just recently purchased my first IDI diesel and I am still trying to learn how they work although I am pretty mechanically inclined.

I would tend to think that the number 7 hole either leaned out and got hot, or washed down with fuel.

I am sure somebody will far more experience with these motors will be long to answer your question properly. From what I have read, when pushed too far, number 7 cylinder is the one to fail first on these motors.

I am gonna keep an eye on this thread in hopes to learn something useful....something other than the attack of little green men being the cause of the scoring.

 

i have adhd and dislexea look the up shuck a great combo yo have