handtpipeline
Well-Known Member
I have a 1989 or 90 model Case 125b that we bought practically new. It had less that 200 hours as a rental machine when we bought it. It now has about 4200 hours on it, and I'm having some problems... In about 2002, the turbo went out on it, so I put a new turbo on, then a couple of weeks later, it developed another problem, I don't really remember what it was, but it was decided that it needed injectors, so we put a set of injectors in it. Within just a few hours with the new injectors, it developed a real bad knocking sound. I was convinced it threw a rod, so hauled it in and parked it. Ended up buying a used PC300-5 and later a new PC200-lc8, so the Case just sat. About a year ago, it was mentioned to a mechanic we know about the knock developing with the new injectors, and he said it was probably just "injector knock", and we should try to fire it up... So we did, and the knock was gone...
So, I've used it around the yard moving stuff around, it smoked a LOT at first, but kinda cleared up. Then one morning, one of the guys ran it out of fuel. We put some fuel in it, and ever since then it bogs down real easily. It was acting like it was running out of fuel. We completely drained the tank, put new fuel lines from tank to lift pump, new lift pump, new line from lift pump to fuel filter, changed fuel filter twice, blew air filter out. It picks up RPM's faster after you bog it down now, but still bogs down pretty bad, and sounds like it has a miss to it. The old lift pump had a BUNCH of crap caught in the screen in it.
Today, I busted the injector lines loose one at a time to see if I could find a dead cylinder, and sure enough, the very front cylinder made no difference. So I pulled that injector out, and it looked like new. No carbon or anything on or around the tip. The piston is moving, I stuck a wire down the injector hole several times, having someone bump the motor over, and the piston does travel (just in the odd chance that it DID throw a rod, piston not moving, and somehow just not making noise now).
So I took the injector to the pump shop we use in Tulsa, and they tested it. Said it was fine. Put it back together, and busted lines loose again. I noticed that the line to this injector doesn't seem to have near the pressure the other lines do. The other lines really shoot fuel when you bust them loose, this one, it's hard to describe, but it just doesn't seem to have as much pressure.
Motor is a Deutz BF6L913 with a bosch inline pump.
So my questions are:
1. What is "Injector Knock"?
2. Would this injector be not firing because the pump isn't supplying enough pressure to make it "pop"?
3. Is there a way I can test the injection pump, or anything servicable on the the pump with it on the machine?
4. Could a stuck intake or exhaust valve on that cylinder cause it not to fire?
5. It also has a lot of blowby after warmed up, which it didn't have before, and I somehow think it's related to whatever is going on.
Any help is very much appreciated. Local Case dealer really pushed these machines when new (we paid quite a bit of money for this one and a new 170C in 1990), but since Case now have there branded Sumitomo machines and also carry the Hitachi brand, they just kinda act like they don't know anything about these Poclain Cases. I did get it running good enough to move it to the dirt pit, but I don't think anyone besides me could run it good enough with it bogging down to load trucks, and I need it there so I can move my 200 to some other jobs I have.
So, I've used it around the yard moving stuff around, it smoked a LOT at first, but kinda cleared up. Then one morning, one of the guys ran it out of fuel. We put some fuel in it, and ever since then it bogs down real easily. It was acting like it was running out of fuel. We completely drained the tank, put new fuel lines from tank to lift pump, new lift pump, new line from lift pump to fuel filter, changed fuel filter twice, blew air filter out. It picks up RPM's faster after you bog it down now, but still bogs down pretty bad, and sounds like it has a miss to it. The old lift pump had a BUNCH of crap caught in the screen in it.
Today, I busted the injector lines loose one at a time to see if I could find a dead cylinder, and sure enough, the very front cylinder made no difference. So I pulled that injector out, and it looked like new. No carbon or anything on or around the tip. The piston is moving, I stuck a wire down the injector hole several times, having someone bump the motor over, and the piston does travel (just in the odd chance that it DID throw a rod, piston not moving, and somehow just not making noise now).
So I took the injector to the pump shop we use in Tulsa, and they tested it. Said it was fine. Put it back together, and busted lines loose again. I noticed that the line to this injector doesn't seem to have near the pressure the other lines do. The other lines really shoot fuel when you bust them loose, this one, it's hard to describe, but it just doesn't seem to have as much pressure.
Motor is a Deutz BF6L913 with a bosch inline pump.
So my questions are:
1. What is "Injector Knock"?
2. Would this injector be not firing because the pump isn't supplying enough pressure to make it "pop"?
3. Is there a way I can test the injection pump, or anything servicable on the the pump with it on the machine?
4. Could a stuck intake or exhaust valve on that cylinder cause it not to fire?
5. It also has a lot of blowby after warmed up, which it didn't have before, and I somehow think it's related to whatever is going on.
Any help is very much appreciated. Local Case dealer really pushed these machines when new (we paid quite a bit of money for this one and a new 170C in 1990), but since Case now have there branded Sumitomo machines and also carry the Hitachi brand, they just kinda act like they don't know anything about these Poclain Cases. I did get it running good enough to move it to the dirt pit, but I don't think anyone besides me could run it good enough with it bogging down to load trucks, and I need it there so I can move my 200 to some other jobs I have.
