I thought I would create a new thread to introduce myself and show a few of my projects. I have a CNC machine shop here in the Peoria, IL area. We make general job shop stuff. I worked at a truck mechanic when I was in college and my dad also has a small machine shop where he does a lot of repairs to ag and construction equipment.
My latest project was this Bobcat 825. I bought it was a thrown rod and hole in the side of the block. It's a Perkins 4.108 diesel. It was knocking so he took it to the local Bobcat dealer. Some genius there told him it was probably a sticking injector and he should just put some ATF in the fuel tank (I've never heard of this actually working, but that's beside the point). Anyway, suffice it to say, it was not a stuck injector.
My conclusion is that the oil was diluted with diesel from a combination of a leaking diaphragm in the lift pump and a leaking front seal in the injection pump. When I drained the oil it was about 1/2 diesel. That also tells me that the owner never checked the oil. With the fuel diluting the oil, it was just a matter of time until something bad happened.
I welded the hole in the block. I had the crank welded and ground. Then did a full overhaul with new liners (dry) and complete valve and head job. Had the injectors rebuild and I resealed the CAV injection pump. Now she runs like a top.
The pivot at the bottom of the bucket was egged out. I bought new bushings, but the holes were way oversize. Line boring was the only way to fix it. I have a shop full of CNC machines, so I figured I could whip up my own line boring rig... It turned into quite a project, but the results were fantastic.
My latest project was this Bobcat 825. I bought it was a thrown rod and hole in the side of the block. It's a Perkins 4.108 diesel. It was knocking so he took it to the local Bobcat dealer. Some genius there told him it was probably a sticking injector and he should just put some ATF in the fuel tank (I've never heard of this actually working, but that's beside the point). Anyway, suffice it to say, it was not a stuck injector.
My conclusion is that the oil was diluted with diesel from a combination of a leaking diaphragm in the lift pump and a leaking front seal in the injection pump. When I drained the oil it was about 1/2 diesel. That also tells me that the owner never checked the oil. With the fuel diluting the oil, it was just a matter of time until something bad happened.
I welded the hole in the block. I had the crank welded and ground. Then did a full overhaul with new liners (dry) and complete valve and head job. Had the injectors rebuild and I resealed the CAV injection pump. Now she runs like a top.
The pivot at the bottom of the bucket was egged out. I bought new bushings, but the holes were way oversize. Line boring was the only way to fix it. I have a shop full of CNC machines, so I figured I could whip up my own line boring rig... It turned into quite a project, but the results were fantastic.
My Introduction
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