Extreme Mechanic Solutions

Extreme Mechanic Solutions

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This is a C9 Caterpillar engine, it had a problem of engine oil consumption but no external leak. After removing fuel filters I realized the fuel had blackened, meaning oil was leaking into the fuel system somewhere. This can be a headache unless you know how the C9 which uses a HEUI fuel system works . With the knowledge of how it works I only had in mind 3 points where oil to fuel mixing can happen, on the injectors, between the injection pump and the fuel pump or a crack in the head. It's easy to eliminate the injection pump to fuel pump bypass, what you do is get a clean container with clean diesel change the primary filter,remove the suction line from the original tank and put into the container with clean diesel (roughly 40litres) , leave line on main tank and run the engine for about 15 minutes.
After that stop the engine and open the primary oil filter, if the fuel is blackened the problem is a leak between the injection pump and the fuel pump but if it's clean you remain with 2 options, injectors or cracked head. In my case it passed the first test then I had to look for a diagnostic for the final 2 options luckily I got those results, I changed 2 unit injectors and the pump is now back at work👍👍

22/12/2025

This is a C9 Caterpillar engine, it had a problem of engine oil consumption but no external leak. After removing fuel filters I realized the fuel had blackened, meaning oil was leaking into the fuel system somewhere. This can be a headache unless you know how the C9 which uses a HEUI fuel system works . With the knowledge of how it works I only had in mind 3 points where oil to fuel mixing can happen, on the injectors, between the injection pump and the fuel pump or a crack in the head. It's easy to eliminate the injection pump to fuel pump bypass, what you do is get a clean container with clean diesel change the primary filter,remove the suction line from the original tank and put into the container with clean diesel (roughly 40litres) , leave line on main tank and run the engine for about 15 minutes. After that stop the engine and open the primary oil filter, if the fuel is blackened the problem is a leak between the injection pump and the fuel pump but if it's clean you remain with 2 options, injectors or cracked head. In my case it passed the first test then I had to look for a diagnostic for the final 2 options luckily I got those results, I changed 2 unit injectors and the pump is now back at work👍👍

14/12/2025

..game over..

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