Injector Pump Problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 07-22-2014, 02:32 AM Thread Starter
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Injector Pump Problem

Hello All. I am new to the forum and new to Diesels, but having worked on Japanese motors over 20 years, I am mechanically inclined enough to get most jobs done once I ‘know what to do’, lol.

So I have an 84 Winnebago 6.2 that now gets no Injector fuel. It ran fine when I bought it a year ago and drove 4 hrs home, where it stayed parked and not started since then. When I did try to start it I smelled fuel and found the Injector Pump Accelerator Shaft leaking. I took the top off the IP and and figured out how to remove the shaft, making sure I marked the positions of ‘whatever components’ are attached on the passenger side of the shaft. I replaced the shaft seals and put it back together, first making sure the Fuel Cutoff Solenoid worked and it’s internal linkage placed as it’s supposed to.

I took the gas cap off, and on Crank I get plenty of fuel coming out of the Filter Bleed, the T-Valve/Water Bleed and the Return Line. With the top ‘off’ the IP, (again on crank), it fills with fuel at an estimated 1/2 cup a minute, (based on a 15 second crank). I removed an Injector Line at the IP , manually held the Metering Valve linkage to ‘open’, cranked 15 secs once a minute for 5 minutes; nothing, not a drop coming out to injector line!

Perhaps I missed something when taking the IP apart or back together, although I have now triple checked myself. Does anyone have any insights on what could be the problem?

I wouldn't think the IP just went bad from sitting for a year…hmmm, although I guess Water residue could have frozen up an internal piston or something. With that, anyone have experience in rebuilding these things? I thought about pulling the Metering Valve since this is what cuts off the fuel, and go from there. (I have found similar cutoff valves/ports clogged with gunk many times on regular Carbs).

Anyway, I have a vacation to go on with this ride at weeks end, so Any help is mucho appreciated. Thank You!
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post #2 of 4 (permalink) Old 07-22-2014, 05:40 PM Thread Starter
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Oh, and also. I have found through the forums a couple posts about being careful to Not loose a 'little Red Spring', that is in the 'Governor Spring Assembly" inside the IP, which the Guide Pin presses on. Well, I never took the Gov Spring Assembly out, only the Guide Pin, and Never saw a little red spring. Any insights on that, especially a pic, diagram or even a drawing of where this mystery spring is supposed to go exactly would be awesome !

Thanks again !!!
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post #3 of 4 (permalink) Old 07-25-2014, 10:22 AM Thread Starter
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Touchdown! After reading more through this forum and a few others, I found a couple posts where Injector Pumps can sometimes need to be cycled many, many times due to air pockets within, sometimes taking a couple hours. (Gotta let the starter cool a tad in between attempts).

Note; I still had a line disconnected at the IP so I could observe any progress.

So with the pedal floored, I turned the engine for 15 seconds at a time waiting 3 minutes in between as to not fry my starter. About an hour into doing this, (had to use my truck and jumper cables to assist my tiring batteries), she finally began to spew fuel. I reconnected the line and with just a couple more rounds she fired right up, and starts every time now!

Btw, (and I Don't necessarily recommend anyone else doing this), I used a trick that an 'ol forty-year diesel mech taught me over twenty years ago when I tackled my only previous diesel job. He showed me how he quickly and easily purges the Lines of air Without having to crack the lines at the cylinders. He filled a beer bottle with regular gas, put his thumb over the end and sprinkled a few drops into the intake while I cranked it, (this being just after installing the lines). The rig fired right up after the Second crank! He said the secret was, "ONLY use just a few drops, and ONLY use a Budwieser bottle !" ... Lol.

Best of Luck to All !!!

Last edited by gmandiesel; 07-25-2014 at 10:37 AM.
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post #4 of 4 (permalink) Old 08-24-2014, 03:53 PM
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Maybe I missed it but did you loosen all the inj lines while you were cranking it ?
That is a must do. You loosen all the lines at the injs, hold the pedal to the floor and crank until fuel comes out the lines. tighten all lines, crank with foot to floor again until it starts.

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