y5mgisi
1 ton status
I think you will be quite happy!
CK5
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One Piece at a Time: My 1985 Diesel Suburban
- Thread starter AgDieseler
- Start date
big-blue
1/2 ton status
I guess you have already rolled through, eh?
Still a couple of weeks out. I'll probably end up taking the 03 Duramax since it fits in parking garages and does not have a leaking injection pump.
That second bit showed up a few days ago on a short local drive. I hadn't run the truck in about 2 weeks due to work and travel, and it died immediately after the first crank and fire, which tells me there's air in the lines at or near the pump. After a bit of cranking, the bubble clears and the engine runs normally, except for a sticking food feed, which fades after a few cycles. Get to the hardware store, and diesel is dripping from the TC dust cover, so that tells me there's fuel in the valley and I immediately think back to when the seal on the advance piston failed and vomited (what seemed like) a gallon of #2 on my shop floor. Maybe that seal has failed again, or maybe the sticking foot feed is related to a failed seal at the throttle bracket. I had a lot of ideas at the time, but I needed a 3/4 bolt, some self etching primer, and a sheet of 18ga steel. Home Depot had exactly one of those things, and the nozzle was broken. I curse the Home Depot.
I return to the parking lot, raise the hood, scope out the IP, confirm the wet valley floor, run the lift pump to check for obvious leaks at the seals, filter, or feed lines, and finally start the engine. No apparent leak. Back at the shop, I park a drip pan under the still running engine to see if I can capture anything. Nope. I wait a day and repeat the cycle. No leak. I wait another two days; repeat. Nothing.
I've waited a week, now, and I'm about to go try it out again. I love my old truck.
David
That second bit showed up a few days ago on a short local drive. I hadn't run the truck in about 2 weeks due to work and travel, and it died immediately after the first crank and fire, which tells me there's air in the lines at or near the pump. After a bit of cranking, the bubble clears and the engine runs normally, except for a sticking food feed, which fades after a few cycles. Get to the hardware store, and diesel is dripping from the TC dust cover, so that tells me there's fuel in the valley and I immediately think back to when the seal on the advance piston failed and vomited (what seemed like) a gallon of #2 on my shop floor. Maybe that seal has failed again, or maybe the sticking foot feed is related to a failed seal at the throttle bracket. I had a lot of ideas at the time, but I needed a 3/4 bolt, some self etching primer, and a sheet of 18ga steel. Home Depot had exactly one of those things, and the nozzle was broken. I curse the Home Depot.
I return to the parking lot, raise the hood, scope out the IP, confirm the wet valley floor, run the lift pump to check for obvious leaks at the seals, filter, or feed lines, and finally start the engine. No apparent leak. Back at the shop, I park a drip pan under the still running engine to see if I can capture anything. Nope. I wait a day and repeat the cycle. No leak. I wait another two days; repeat. Nothing.
I've waited a week, now, and I'm about to go try it out again. I love my old truck.
David
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big-blue
1/2 ton status
Hit me up if you want company for a quick bite / rest when you come through. I am minutes away from I-10 for both work and home. Can meet you pretty much anywhere.
By the way. Still no leak.
David
David
Found it. One of the four o-rings on the advance piston is leaking under part throttle; probably the outermost one. Eventually, it will show up at idle and pour all over the floor. Again. Guess I'm ordering a pump tomorrow.
David
David
The whole pump has to come off, which is a bit of a procedure. Not difficult, but time consuming.
It's a hotrodded pump, so my local diesel shop won't touch it without doing a full rebuild and resetting to factory metering. It's a 4911 head stuffed in a military pump body with the original (and smaller) plungers. It's what I could build on a college budget, and get enough fuel for my target power levels. I've run this setup for about 10 years and 60K miles, and it's performed well enough, but it's not been the most reliable piece of hotrod gear.
It's time to get a legitimate factory HO pump. Look at me, being an adult.
David
It's a hotrodded pump, so my local diesel shop won't touch it without doing a full rebuild and resetting to factory metering. It's a 4911 head stuffed in a military pump body with the original (and smaller) plungers. It's what I could build on a college budget, and get enough fuel for my target power levels. I've run this setup for about 10 years and 60K miles, and it's performed well enough, but it's not been the most reliable piece of hotrod gear.
It's time to get a legitimate factory HO pump. Look at me, being an adult.
David
I hate when that happens...
I thought that there were some factory J code engines that came with the HO pump.. Or are you talking about sumpthin different..
The metering on J code engines don't get past 60 cc fully turned up, and they all use the smaller 829 plungers. I'm running 76 cc's on my mix-and-match DB2, a setting that's only really attainable in factory form via a 4911 head and body, plus it comes with the 831 plungers. Excluding a spendy 250/300hp marine pump, I'm thinking a 4911 is the best bet in terms of reliability and ease of service.
David
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all this talk of injection pumps makes me want a 6.2L. i'm diesel addict at heart and old mechanical engines are where it's at in my opinion. i can't wait to check out your rig next year out on the playa.
Looking forward to it. As for tonight, I have my favorite cologne back on: diesel #2.
David
David
Dropped off my DB2 this morning at the local diesel shop - M&D Diesel. I totally underestimated those folks. They're going through the pump today, and will see if they can rebuild it to the fully Stanadyne certified 4911 specs and save me a few bucks. Their only restriction is they have to build back to a specific model number; no custom stuff.
If that doesn't work, they have a newly built 4911 on the shelf.
David
If that doesn't work, they have a newly built 4911 on the shelf.
David
Nice
y5mgisi
1 ton status
Sweet!
So, rebuild? or new?
Didn't hear back today. Long day of work for me, and didn't get a chance to even think about calling them. So, Monday.
Until then, I'm deleting the battery tray on the Dodge.
David
Until then, I'm deleting the battery tray on the Dodge.
David
