CJAMS
Member
Recently bought an Allis Chalmers 6080 wit the 433I engine, DB2437-4453 IP. I was told it would run for 20-30 seconds and then quit. Sounded like the flex ring so I pulled return line and no fuel was coming out while cranking the engine. Cracked the injection line and same no fuel .
Ended up pulling the pump cleaning the outside and then opening it up. Yes the flex ring was all gone, only two 1/2 inch pieces still attached. So I cleaned and blew out all of the ports in the head and body, and replaced the flex ring. The plungers were not stuck and moved freely, pulled the delivery valve to see if it had anything in it too, don't recall if there was anything was getting late that night. Do recall the vent screw was plugged good but cleaned up well. Ended up reassembling and putting back on the tractor to test it out. Still no fuel while cranking it over. Had a charger on the batteries so it cranked at a good speed. So then I changed the Fuel filter and checked all of the lines as this is a gravity only system. Bottom of the tank is about 18" higher than the pump and is 3/4 full of fuel. Checked and fuel runs out good to the pump.
So I figured the transfer pump might need new vanes, found they were worn .003 compared to new ones (20511). Tried again on the tractor and now it just Burps a small amount of fuel (this is an improvement). Was working this for several hours (even took of the cover to make sure the MV was in the full fuel position), had to keep letting the starter cool down. Checked for suction leaks but don't really see any, will now replace the two 3/8 compression sleeves on the steel inlet line just for good measure.
I made a fitting to measure the transfer pressure but haven't tried it on the tractor yet. Don't know if this is still an issue. Should I also replace the transfer pump liner (what PN)?
Last thing I found while originally inspecting the pump was small amount of burnishing on the Delivery Valve - is this normal? It wasn't stuck and fell out tapping the head on my hand. I am wondering if I should replace this too due to the discoloration? The delivery valve has a 30 stamped on the spring end, AGCO PN 74053451, anyone know the Stanadyne #?
I didn't see any cracks in the Cam, plungers are not stuck, new blades, blew out all cavities, metering valve is not stuck, solenoid is working too (tried i t with the cover off - stayed held while cranking the engine too)... It should pump fuel, correct?
Any ideas what I could be missing that is still causing no high pressure fuel to be pumped?
Thanks in advance
Ended up pulling the pump cleaning the outside and then opening it up. Yes the flex ring was all gone, only two 1/2 inch pieces still attached. So I cleaned and blew out all of the ports in the head and body, and replaced the flex ring. The plungers were not stuck and moved freely, pulled the delivery valve to see if it had anything in it too, don't recall if there was anything was getting late that night. Do recall the vent screw was plugged good but cleaned up well. Ended up reassembling and putting back on the tractor to test it out. Still no fuel while cranking it over. Had a charger on the batteries so it cranked at a good speed. So then I changed the Fuel filter and checked all of the lines as this is a gravity only system. Bottom of the tank is about 18" higher than the pump and is 3/4 full of fuel. Checked and fuel runs out good to the pump.
So I figured the transfer pump might need new vanes, found they were worn .003 compared to new ones (20511). Tried again on the tractor and now it just Burps a small amount of fuel (this is an improvement). Was working this for several hours (even took of the cover to make sure the MV was in the full fuel position), had to keep letting the starter cool down. Checked for suction leaks but don't really see any, will now replace the two 3/8 compression sleeves on the steel inlet line just for good measure.
I made a fitting to measure the transfer pressure but haven't tried it on the tractor yet. Don't know if this is still an issue. Should I also replace the transfer pump liner (what PN)?
Last thing I found while originally inspecting the pump was small amount of burnishing on the Delivery Valve - is this normal? It wasn't stuck and fell out tapping the head on my hand. I am wondering if I should replace this too due to the discoloration? The delivery valve has a 30 stamped on the spring end, AGCO PN 74053451, anyone know the Stanadyne #?
I didn't see any cracks in the Cam, plungers are not stuck, new blades, blew out all cavities, metering valve is not stuck, solenoid is working too (tried i t with the cover off - stayed held while cranking the engine too)... It should pump fuel, correct?
Any ideas what I could be missing that is still causing no high pressure fuel to be pumped?
Thanks in advance
Last edited: