IH 806 will not start

Shahn · Sep 30, 2008

I have a 1966 IH 806 diesel that will not start/run. A couple of weeks ago, I found the fuel line between the primary and secondary fuel filters was leaking. I replaced the hose and both fuel filters. The tractor ran good before I replaced the hose and filters. After bleeding the fuel system, the tractor ran fine for a little while but then it died. I found that the hose I replaced between the filters had kinked and collapsed. I corrected that problem and tried to bleed the fuel system again. However, now the tractor will not start and run. An IH mechanic told me to crack the steel fuel lines at all six injectors. I did this but the engine still won"t start/run. When I crank the starter, with the fuel lines cracked at the injectors, no fuel comes out. Is is likely my diesel pump needs to be rebuilt? I"m wondering if the collapsed fuel line damaged the pump. The IH mechanic told me it would cost $800 plus for him to rebuild the pump. I would like to be sure that is the problem before I take it off.

Randy in NE · Sep 30, 2008

Are you sure that you got the pump primed since replacing the line the second time? Are you getting fuel out of the filters? I sent you an email with information for DL Diesel, which is my brother's business. He is mostly Cummins but he does do some Roosa-Masters and Model 100's.

Owen Aaland · Sep 30, 2008

Make sure you have fuel entering the pump. You must also have some fuel exiting the top of the pump while cranking. If you do not have fuel coming out the return fitting you will not be able to charge the high pressure pistons with the result that you will get no fuel delivery to the injectors.

Dellbertt · Oct 1, 2008

On my case 1030, a mechanic put an air compressor hose in the tank filler with a rag around it and slowly put some pressure in the tank and the tractor started up immediately.

Just my experience, dont know if that would work on yours or not.

Shahn · Oct 1, 2008

Fuel is getting to the pump. Is there a fitting on the pump that can be opened to bleed air?

Owen Aaland · Oct 1, 2008

Fuel enters the injection pump at the rear where the charge pump is located. The charge pump will gravity bleed. As the engine is cranked over the charge pump will fill the case and any air will be pumped out the return fitting on the top of the pump and return to the fuel tank. If the return fitting or line is plugged the pump will not have the air bled out but also because pressure will build in the case, equal pressure on each side of the high pressure pistons will not allow them to move out and receive a fuel charge. The result will be no fuel delivery to the nozzles.

Remove the return line from the top of the pump. Crank the engine to see if there is fuel being pumped out. If not, remove the restrictor fitting from the top of the pump and check again for fuel being pumped out. If you still do not get fuel, remove the two screws that hold the side cover in place. Remove the cover and check to see that the front ring that you see in the opening is turning when the engine is cranking. If the pump ring does not turn, the pump head has seized and the drive shaft has been twisted off.

IH 806 will not start

Shahn

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Randy in NE

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Owen Aaland

Well-known Member

Dellbertt

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Shahn

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Owen Aaland

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