3208

ken 1960

Member
i have a 3208 in a gmc tandem dump, it is not getting up 160 degrees what could cause this. heater gets warm .i started it other day an radiator hoses were sucked toghether after it warmed up it was ok.
 

willie59

Administrator
Staff member
Welcome to the forum ken 1960. I could rationalize the lower radiator hose being sucked flat by a clogged radiator core. But I have no explanation if the top radiator hose is sucked flat.
 

Grapes

Member
I agree with craft about the rad cap. Whats the temp. like were you re at? The temp problem might just be a stuck thermostat
 

ken 1960

Member
it is bottom hose that suckes togher , an can someone tell me when i start the truck i see fuel driping out of over flow line that comes out of top of injection pump is it supose to or something wrong.
 

willie59

Administrator
Staff member
Question #2, you're not going to hurt a 3208, or any diesel for that matter running at 155 to 160 degrees, that's actually too cold, that is if the temp gauge is reading correctly.

Question #1, that's not an "overflow" line. If I recall the 3208 correctly, it has a bleeder valve on the top of the injection pump to purge air when repairs to the pump have been made. If I'm correct, that "leaking" hose should be connected to a valve on top of the injection pump, a small shut off valve. If that's what is there, you have either a shut off valve that is not closed completely, or it's faulty, there should be no fuel leaking from that tube.
 

Plant Fitter

New member
Question #1, that's not an "overflow" line. If I recall the 3208 correctly, it has a bleeder valve on the top of the injection pump to purge air when repairs to the pump have been made. If I'm correct, that "leaking" hose should be connected to a valve on top of the injection pump, a small shut off valve. If that's what is there, you have either a shut off valve that is not closed completely, or it's faulty, there should be no fuel leaking from that tube.
There are 2 lines from the top of the injector pump.

One comes from a small tap, used for bleeding as you describe.

The other just comes from a small elbow on the top cover of the pump. But I don't know what it does either.
 

willie59

Administrator
Staff member
I think, and man I'm having to go way back to think of this so I could be mistaken, but I think that other line that goes to an elbow on the top of the pump vents the chamber where the shutdown solenoid lever and shaft is located. That's a dry chamber with shaft seals on the end of the shaft. That vent serves two purposes if you have a failure of the shaft seal, 1) to keep fuel from going into the shutdown solenoid, and 2), if you see leakage from that vent tube, it gives you a visual indication that you need to replace the shaft seal.
 
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