Mini Lathe To Simplify Quick Thread Removal

When a friend was investigating a fuel leak located at a fuel injector (IH diesel truck engine), he discovered a motor monkey had previously cross-threaded the line nut onto the top of the injector, so he proceeded to remove the injector (the line nut was good).

He went to a nearby heavy truck dealer and bought a remanufactured injector, copper crush seal, and O-rings for the fuel return fitting. The reman injector was only about $46 plus a core charge.

A problem developed, as the bottom portion of the injector separated from the larger, upper portion. The part was down in a restricted recess about 2" deep. Since the upper injector portion had a very coarse thread, but the bottom portion had a very fine thread, it would be very unlikely that the parts could be reassembled in the engine.

We speculated that real truck mechanics probably have a special tool with the proper thread to screw into the lower portion, which could then be withdrawn with a puller or slide hammer.

The conclusion was to sacrifice the fuctup injector, as it only has a value of $13 as a core charge when purchasing a remanufactured injector.

Chucked the injector upper portion in the mini lathe 3-jaw and cut away the coarse thread lickitysplit.. in a shower of hot chips.

We had seen that the bottom portion could've been heavily coated with carbon and potentially difficult to remove.. but it wasn't. He ended up with a removal tool for future use, which could be adapted for slide hammer use if needed to gently "bump out" another part if the problem arises.

The worst-case of needing to pull a head off will likely cause your trip to be postponed.

Reply to
Loading thread data ...

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.