The following is a recap with pictures of all the tools that can be made very easily at home to remove the injectors, prechamber collers and prechambers on a 617.9xx engine. All tools worked exceptionally well and some of the ideas came off this site from previous threads, however I was not able to find pics (that does not mean they are not there). The entire job after the tools were made took roughly 4 hours and went very smoothly. The only hitch was with the collars, 2 of them came out easily with the homemade tool, the remaining 3 had to be loosened with a hammer and chisel because the collar started to break apart using the tool. During assembly the tool worked like a charm.
Feel free to PM me if any additional details are needed.
To remove injectors, I used an old cornwell deep impact socket 1 1/16 and used a carbide bit to grind down the interior walls to accommodate the injector weep ports. This took about 20 minutes.......Cost $0 plus labor.
To remove prechamber collars, I used an old cornwell 7/8 shallow impact socket and used a cut off wheel on a die grinder to cut notches that fit in groves of collar. This took about 5 minutes.....Cost $0 plus labor. It was also helpful to use the bicycle crank tool installed into the collar (just happened to fit the 7/8 socket perfectly) to stabilize the socket so it would not slip out of the groves.
To remove prechambers, I used a slide hammer purchased at a local tool shop for $10 and using info from this site I went to the local cycle shop and purchased a bicycle crank extractor tool for $20. Using a cut off wheel on a die grinder I removed the crank handle and took the rest to a local welding shop where they welded the inner bolt of the crank tool to a part of the slide hammer for $10.
Here are more pics
A few more pics
For those needing or wanting instructions.
Take pictures for reassembly and routing, BEFORE work begins.
Pull throttle linkages off and out of the way.
Remove the STEEL Injector lines from injectors and injection pump, flip the line set up side down, cover the line ports to protect against dirt/grit, and set aside.
Cover the injection pump delivery valve ports against grit/dirt.
Remove the injectors.
Remove the injector heat shields (I used an old dental pick to remove the shield).
Remove glow plugs, brace the wire harness connector so it does not twist off.
Remove prechamber collars.
Screw tool into prechamber and extract using slide hammer (Mine took about 10 smacks each, some prechambers have been known to require heavier force).
Make sure prechamber seal ring is also removed.
Clean out any carbon / soot / dirt, use a vacuum cleaner with a wide bore drinking straw taped to the nozzle for reaching into the cylinder.
WARNING: You MUST install a NEW prechamber seal ring every time the prechamber is removed, this is a single crush sealâ€¦
OM617 part numbers are:
Standard seal ring MB# 6150170060
Repair size I; 2.3mm MB# 6150170160
Repair size I; 2.6mm MB# 6150170260
Repair size I; 2.9mm MB# 6150170360
Using a good used or new prechamber, thread tool into prechamber and tap into place firmly.
OM617 prechamber number is:
Install new collar
OM617 prechamber collar number is:
Install new glow plugs, WARNING/DANGER:
you can break the tapered seat in cylinder head with excess force.
Install a NEW heat shield. WARNING:
You MUST install a NEW heat shield every time the Injector is removed, this is a single crush sealâ€¦
Install wires onto glow plugs. WARNING/DANGER:
This is an electric connection, the eight millimeter nut should be tightened with a wrench, and final torque is applied using one finger tip = any more force will damage or break the electrode = destroy your new glow plugs.
Install STEEL injector lines, and looped fuel return hoses.
Install throttle linkage.
Prime the fuel system one hundred strokes.
Start the engine.
Use 50/50 solution of dish soap/water to inspect for prechamber combustion leaks.
Discuss this DIY here.