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NEMO | Have a 3208 that has a puddle of fuel on top of the engine I'm guessing its seal or gasket on the bottom of the pump since I cant see any wetness on the top or the sides of it. Just wondering if anyone else has had this problem and how they fixed it since they appear to be a bear to get at. Its probably going into the truck shop but last time I was there most of the techs looked to have been born post 3208 and I'd like to get some ideas first in case its a simple fix. |
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Between Omaha and Des Moines, 7 miles South of I80 | If your sure the top and the sides, are dry; then first, I would wiggle the shutoff solenoid= if it wiggles, then the two rear mounting bolts are loose and probably have been loose, for a while and it MAY have cracked that rear aluminum housing.
It may be the throttle shaft seal is leaking.
It may be loose drain plug, at very rear, lower part of governor housing. (9/16" head, on that plug)
It may be a loose, long drain bolt (part of rear governor housing mounting bolts) found at the very rear, center. (7/16" socket fits this one= it has a 0-ring in that one bolt)
It may be that the front lower "drain line tube" has come off of the vent fitting, that is suppose to let fuel drain to the forward, left side of the engine, WHEN the fuel transfer pumps lip seal fails. If that fuel transfer pump lip seal failed and the tube is OFF, then the leaky fuel goes into the valley of the engine. (this is one, of three, plastic vent tubes/lines that come off that 3208 injection pump)
 (3208 injection pump Top photo.jpg)
 (3208 injection pump side photo.jpg)
 (3208 injection pump view with bleed line tubes.jpg)
 (3208 injection pump line art photo.jpg)
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 3208 injection pump Top photo.jpg (37KB - 2702 downloads)
3208 injection pump side photo.jpg (29KB - 2339 downloads)
3208 injection pump view with bleed line tubes.jpg (24KB - 2477 downloads)
3208 injection pump line art photo.jpg (11KB - 2396 downloads)
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Eastern Indiana | I would say that you most likely have a throttle shaft seal leaking fuel.The inection pump is internally pressurized to 30 psi by the internal fuel pump located in the front portion of the injection pump.The housing located at the rear of pump contains the governor. In this housing the throttle shaft hole wears oblong from the twisting of the throttle lever eventually causing the pressurized fuel to leak past. |
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Between Omaha and Des Moines, 7 miles South of I80 | one more spot to look at, is this left side plug, in the lower, left corner of this photo, BUT this location of a leak is rare.
 (3208 pump.jpg)
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3208 pump.jpg (57KB - 2534 downloads)
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NEMO | Thanks for the ideas and pics I'll check closer in the morning . One problem is its in a Top Kick , so they built a truck around an engine and theres not much room to get your head in there. The fuel solenoid itself is loose and has been for over 15 years that Ive had it but the 2 bolts that hold it down to the pump are tight. I did unbolt the shutoff and lift it out last fall when it wouldnt start and I thought it might be stuck. Could this have caused the leak underneithe ? |
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Between Omaha and Des Moines, 7 miles South of I80 | AR1920 - 3/26/2013 22:27 Thanks for the ideas and pics I'll check closer in the morning . One problem is its in a Top Kick , so they built a truck around an engine and theres not much room to get your head in there. The fuel solenoid itself is loose and has been for over 15 years that Ive had it but the 2 bolts that hold it down to the pump are tight. I did unbolt the shutoff and lift it out last fall when it wouldnt start and I thought it might be stuck. Could this have caused the leak underneithe ?
That shouldn't have caused a leak, at the location, you have mentioned. If you look, that area under the shutoff solenoid, it ALSO as one of those plastic drain/vent tubes attached to that area, SO if that area starts leaking fuel, it too, is supposed to go out the plastic tube, and over to the left, front corner of the engine(front of oil cooler area)
Normally, if I was to run a 3208 engine very long, without the shutoff solenoid installed; then I get two shorter bolts and install them where the shutoff was = it keeps that gasket "tight" under there, because it has fuel pressure against it, during running.
If it was leaking at the fuel shutoff area AND it was loose for 15 years, then I would think that you could see fuel coming out the top, pretty easily. (on a reread; maybe you meant that the plunger is loose INSIDE of the fuel shutoff solenoid. That would be normal)
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CAT Injector Pump Leak
