diagnosis 4.0 replace

[trail B2]

I have a 93 4.0 in my 86 B2 put it in about 5 years ago.It was using oil and slowing down when I put it in it had 200,000 miles.I found a 93 4.0 on craigs list with 90,000 miles from an accident.I put it in everything plugged in it slipped right in.When I got it in it did not turn over something hit in the piston top it was full of powder I think from a fire extinguisher. I vacuumed out the cylinders one mainly put new lifters in it because they have a tendency to tick.When I put it together there was a crack on the of one injector rims I could see when I put the intake on I thought it was on a sleeve the injector fit in wrong thing to do.Now that this motor is together it ticks very valve train like.It has new lifters and hearing the tick I switched the rocker shafts and push rods from my other motor which I had replaced before the tick stayed any ideas on what else could be causing the tick.Feeling pretty lost right now not sure where to go next.

 

[RonD]

Broken Injectors can have a loud tick.

Did you check each valve after tightening valve train, i.e. rotate crank and check if push rod was tight but could be turned with valve closed.

 

[trail B2]

I brought up the injector because I was wondering about that.Ordered a new set we'll see if that helps.

I did check it had problems with the first set the ends were out of round.It did not spin evenly some were also a little looser than it was with the second set but not much.

I've also been chasing running kinda ruff at low RPM poor throttle response.When you go heavy throttle it cleans up and takes off much faster than it ever did with the old 4.0.This morning I started it to work on it today and it flooded I'm thinking that injector is giving me problems.I'm just trying to figure anything else I should do when I take it apart again.There's no ridge at the top of the cylinders, the valves don't look pounded out,valve stem height is very even,Heads are flat in specs,oil pressure is towards the top of the normal range.There's a good motor in there if I can work out these issues.

 

[truckerdawg]

A ticking valve train noise can be a worn piston pin, a broken piston skirt, worn crankshaft bearings, or since the powder in the heads? maybe a bent rod. Just things I have seen that have caused ticking sounds in motors.

 

[trail B2]

I'm thinking that the noise would be straight time if it's a piston double time if it's the piston pin.This noise is half time like a rocker.I can't think of how a piston can make a half speed noise.It turns over very nice and has great oil pressure.Maybe there's just crap in one of the new lifters but we can't pinpoint which one even with the valve cover off.

 

[trail B2]

I got rained out at work today so threw in those injectors today.I didn't have much faith but it did not stop the ticking.It was not a waste though it runs really nice lots of power and good throttle response.I have an engine stethoscope coming I'll see if I can pinpoint the sound.Want to drive it now it runs real nice.

 

[truckerdawg]

I had a 302 in my Ranger years ago with a broken piston skirt on one side of a piston and I just kept thinking it was a lifter not pumping up giving me valve train noise until one day it rocked enough to go through the cylinder wall. A Ford mechanic I took it to also thought it was just valve train noise. Very rare though.

 

[trail B2]

You might be right truckerdawg it doesn't sound like the click of piston slap in the you-tube videos though.Right now I don't care what it is just want to fix it and get my car back.Right now the hills have snow on them I got new 4.88's locked up front and rear, new 35x12.5 KM2's on beadlocks I can air down real well, I even got a 2.9 M5OD with a lower first gear and can't drive my car till I at least know what the noise is.

 

[trail B2]

Solved

OK so here it is I cut an old valve cover so I could run it open and it sounded like the passenger side.Waited ten days for a stethoscope to come in the mail and you could tell by setting the stethoscope on the back rocker shaft bolt it was in the last two valves.My hands didn't make any difference but pushing with the handle of a hammer changed the sound on the front one for that cylinder.I tried changing the rocker and push rod to the best I had laying around no change in sound.This led me to think it was my new lifter wrote a E-Mail to the company I bought the parts from who acted positively and sent sent me a lifter and the gaskets to put it in.I had to take the head off again but it's back together and working well.