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#1
12-07-2005, 12:28 PM
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Injector ' Pop Off ' Pressure ?
O.K. , I was reading about some rebuilt injectors and the seller said the spec. is 115 max , 100 min. popoff pressure and these were set to 110 ~ since my car overfuels now , these maybe are not quite what I need , correct ? .
 BTW : it's a '78 300CD NON turbo engine.... _ANY_ comments will be greatly apreciated !
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better 
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#2
12-07-2005, 12:34 PM
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Unless you know your injectors are worn and have a poor spray pattern I would not replace them....yours sound like an adjustment on the IP is in order.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche Last edited by boneheaddoctor; 12-08-2005 at 09:18 AM.
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#3
12-07-2005, 06:59 PM
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Quote:
Why do you think it is over fueling? This isn't something you would notice except at WOT.
__________________
1977 300D Lost coolant while someone else was driving 1983 300D Can't run without oil 1985 300SD (gone but not forgotten) 1990 300TE 4matic Sold 1991 Yamaha Venture 1975 Kawsaki 250 triple 1974 Honda 200CL 1951 8N Ford 2008 Wildfire 650C
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#4
12-08-2005, 09:04 AM
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Over Fueling Diagnosis
There are several ways I know it is overfueling : one is the constant black smoke it emits at all engine speed & loads , especially @ idle . it sometimes clears up when I'm just cruising but heavy throttle creates more black clouds .
It also has ' soft ' throttle response , a clear indication of overfueling when added to the blck smoke . BTW : it doesn't burn any oil and only drips a little bit of it . Your comments are apreciated as I'm keen to sort this out and don't want to to$$ money into it willy-nilly . -Nate Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#5
12-08-2005, 09:20 AM
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Are you local to an injection shop who can test and clean your current injectors....so you will know if a poor spray pattern is the root of your problem or not?
this makes 14K for me....woo hoo.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#6
12-08-2005, 09:26 AM
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Injector Testing
I just got a set out of a '70 W-116 with only 165K on it , I took them over to Manny's last night but he's too busy to let me test them right now....
Who / where else can I go ? . All I work with via my shop is big Cat. engine suppliers , they all tell me that U.S. (" cat Pee ") Diesel wears injectors rapidly causing too wide a spray pattern and overfueling , we replace lots of filters and injectors in our fleet . I'm in L.A. if anyone knows an honest shop I can take 'em to ~ I'd love to watch and see how it goes . -Nate Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#7
12-08-2005, 09:38 AM
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#8
12-08-2005, 11:52 AM
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OOPS ~
 I meant to typ 1979 W-116 300SD....Sorry 'bout that . -Nate Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#9
12-08-2005, 12:03 PM
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Different pop pressure than yours are.
Can't recomend a shop however...give it some time and I'm sure someone can. The injectors will fit and work..."as a set" but won't be optimum for yor N/A engine....and never mix and match...you would have a very rough running engine.
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#10
12-08-2005, 01:35 PM
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O.K. thanx ~ I was wondering about that .
I'll either get these set up for my engine or go get some more used ones as I get 'em for free , I'd rather do this the right way so it's one less thing I have to worry about . -Nate Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#11
12-08-2005, 07:26 PM
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what style of IP do you have?
This smoking thing might be as simple as an alda adjutment or the alda might be blown. If you have an old M-Style IP (I think they were only on the 240s) it has a fuel adjustment at the rear of the pump that you can make very simply that will stop the smoking.
I doubt it is injectors as your car starts and runs... If your injectors were that bad it would be an awful ride I would think. So. Cal, so you are at sea level? I don't klnow o fmany folks that got a great deal of relief in changing out injectors. Yes it no doubt helps but I have not heard of anyone finding this to be a miracle cure for smoking...
__________________
'99 S420 - Mommies '72 280SE 4.5 - looking to breathe life into it '84 300SD Grey - Sold '85 300SD Silver - Sold '78 Ski Nautique
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#12
12-09-2005, 01:18 AM
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There is a shop up here (NW Oregon) but I imagine there is a place down there. If I get a chance to talk with dad I will ask him...he has to take his diesel stuff somewhere working down there
 (In Alaska right now)Anywho, check out the adjustments on your IP as described and report back
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#13
12-09-2005, 02:22 AM
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The two MB diesels Nate lists are normal aspirated; so no ALDA. There is an ADA, though.
Nate, email sent about pop testing.
__________________
The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#14
12-09-2005, 08:52 AM
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O.K. thanx ~ you guys keep telling me injectors don't cause the smoking but it's the # 1 cause of it in Big Rigs..... the nozzles wear out .
I do have the early typ IP and it has an ALDA (or ADA) on the top , I've not yet fiddled with it as I want the injectors ' just so ' before I fiddle with it . There is also another ALDA - looking thing on the rear back of the IP but it has a vacuum line connected to it so I assumed that's the shut down valve.... Keep those good tips & help coming as I need to get this car up to snuff if I expect SWMBO to ride in it or even drive it.... -Nate Quote:
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#15
12-09-2005, 08:56 AM
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Quote:
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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