Tearing down some cores today and found I had a factory sealed db2831-5028 in my pile. This is a non turbo calibration for 92.5-94.5 7.3 idis with a torque screw housing.
When these pumps fail, it typically starts out as driveability issues, non functioning advance, poor idle, smoking exhaust, that develops into hot start issues and eventually no starts, I’m going to show in this tear down where these problems originate in the pump, what parts are failure prone, address some db2 myths and go through some of my solutions when I rebuild them.
First comes off the top and side cover to drain the fuel, then nose cone is removed to pull the transfer pump assembly. The transfer pump blades and liner are the first moving parts to contact fuel, so these components are usually quite telling for what the rest of the pump will look like. This liner and blade set shows very normal wear with no large particles in the inlet filter or rust/discoloration from water or other fluids getting into the fuel. Good signs.
This liner and blade set would be performing fine with this wear, so the ability for transfer assembly to move the proper volume for actuating the advance system and filling the plungers is not the cause of this pump failure. Remember this pump creates volume displacement, not pressure.
Next the governor assembly is removed, your biggest wear item here is the metering valve. Normal wear on this metering valve, but noticeable uneven wear on the back side of the valve due to the design of the governor assembly putting pressure on the back of the valve at all times.
When these pumps fail, it typically starts out as driveability issues, non functioning advance, poor idle, smoking exhaust, that develops into hot start issues and eventually no starts, I’m going to show in this tear down where these problems originate in the pump, what parts are failure prone, address some db2 myths and go through some of my solutions when I rebuild them.
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First comes off the top and side cover to drain the fuel, then nose cone is removed to pull the transfer pump assembly. The transfer pump blades and liner are the first moving parts to contact fuel, so these components are usually quite telling for what the rest of the pump will look like. This liner and blade set shows very normal wear with no large particles in the inlet filter or rust/discoloration from water or other fluids getting into the fuel. Good signs.
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
This liner and blade set would be performing fine with this wear, so the ability for transfer assembly to move the proper volume for actuating the advance system and filling the plungers is not the cause of this pump failure. Remember this pump creates volume displacement, not pressure.
Next the governor assembly is removed, your biggest wear item here is the metering valve. Normal wear on this metering valve, but noticeable uneven wear on the back side of the valve due to the design of the governor assembly putting pressure on the back of the valve at all times.
You must be registered for see images attach