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#31
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Is it possible that there's a leak internal to the IP?
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#32
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Who rebuilt the injectors? I'd take 'em back, see if they left something important out of one or more. Engine may be OK.
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#33
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Is there a path in the IP to the engine? I don't think fuel can get out through the IP drive, that leaves the lift pump. I can't see how an injector can dump that much fuel into the crancase in that short run time unless a nozzle pintle spring is missing and there's a hole in the piston.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#34
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there's way too much fuel (8+ quarts) in the oil for it to be the injectors, as it ran with the rebuilt ones in for maybe 3 min. It's burning some of that fuel and I understand they're pretty low volume.
How would I check for a leak internal to the IP? (for the shade tree mechanic) What about testing the lift pump by plugging one fitting and applying pressure (mity vac) to the other and seeing if it leaks?
__________________
1986 300 SDL, gray on black, #14 head, 180K miles 1982 300 CD, silver on palomino, 290K+ miles [sold] 1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above] |
#35
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Gotta be coming from the lift pump then. There's an o-ring on the pump shaft which blew out?
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#36
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It's lubed with engine oil I think so there has to be a path between them. It's the only possibility that makes sense to meif the lift pump is ok.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#37
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IP engine oil lube line is an external banjo bolt black nylon line. Someone who rebuilds IP's will know if it is possible for fuel to spill into it.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#38
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Quote:
Jeremy
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#39
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Quote:
Perhaps closing off the supply line on the feed side and trying a gravity feed through the return line. It should take no fuel. Get the fuel feed high in the air if possible. Also since this was not a previous existing condition until the injectors where installed. Perhaps someone left the springs out of them. You should test them quickly for pressure pop point. Although it is hard to imagine so much fuel passing into the engine through this way in such short order. Logically those replacement injectors are suspect regardless of what is thought. |
#40
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Answer
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The total volume of fuel pumped into the crankcase exceeds any possible injection pump output. As I recall injection pump volume is between 0.0x and 0.00X CC per cycle = this is why it takes seriously extended cranking when you totally run out of fuel.. |
#41
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Your diesel tank is not venting air properly. The car was sitting in the sun for a couple weeks before the injector job, the tank was about 3/4 full at the time. While it was sitting there the tank would pressurize up and force diesel down both the return and supply lines to the IP. Diesel pushed by "something" in your IP and kept on going. Fuel filled the IP lube oil space and found its way through the front of the IP and spilled into the crankcase through the timing cover. It did this until the return line was exposed in the tank, at which point the fluid pressure was no longer sufficient to push into the IP.
Find the "something".
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Cheers! Scott McPhee 1987 300D |
#42
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Quote:
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Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
#43
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Methinks mine theory in original post doth have merit. The car sat for several weeks in the warm sun while waiting for the rebuilt injectors.
Quote:
Nonetheless, now that I have the lift pump off, how do I test it? Apply mity vac pressure to the outlet fitting (pressurized side) with the inlet plugged and see if leaks down (presumably out the shaft passageway)? How many PSI do these lift pumps produce (so I don't overdo it and damage the pump)?
__________________
1986 300 SDL, gray on black, #14 head, 180K miles 1982 300 CD, silver on palomino, 290K+ miles [sold] 1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above] |
#44
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Quote:
And you would have seen evidence of the leakage when you returned to the car to install the injectors. Plus I have serious trouble imagining enough drip down to fill the crankcase as you describe. If diesel got in there, I'm liking the other theories much more.
__________________
Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 |
#45
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I probably should have mentioned that the rags I put in/on the injector holes were 100% soaked with diesel fuel after a two weeks. doh! My sniffer doesn't work that well so the smell wouldn't have alerted me.
The problem with the lift pump theory is that 8+ quarts of fuel into the crankcase in 200 miles with no prior issues seems unlikely. Then there's the odds of the coincidence of the lift pump catastrophically failing at exactly the same time as replacing the injectors (not a impossibility I know). So while I discount the lift pump theory, I want to test. Just read here fuel pressure that lift pump pressures should be in the 20psi range, so I think I'll try my mity vac pressure test above, unless there are strong/knowledgeable opinions to the contrary.
__________________
1986 300 SDL, gray on black, #14 head, 180K miles 1982 300 CD, silver on palomino, 290K+ miles [sold] 1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above] |
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