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#1
11-15-2012, 03:23 PM
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Manually shifting your diesel?
Anyone else find that their diesel (sometimes) shifts to early on uphill grades?
I've turned to down shifting to keep my engine in the 2-2.5K range. It seems happier in that range and prevents "pre-shifting" into 4th. Interested if anyone sees a down side (read:tranny health) to this? Thanks-PK 
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#2
11-15-2012, 03:44 PM
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I often keep mine in 3 or shift down manually when coming up to a steep-ish hill, having learn to drive a manual (or stick) car, considering the narrow power-bands and that they don't mind high revs, I'd rather be in the right gear to start with than waiting for the car to do it when the car is starting to bog-down.
Shifting should be at around 2-2.5k anyway. It's recommended in MB literature and I drove my past 300D like that for the 85,000 or so miles I had it for and the transmission still shifted perfectly when I sold it.
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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#3
11-15-2012, 04:13 PM
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Quote:
__________________
 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
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#4
11-15-2012, 05:15 PM
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Climbing the passes on I-70 I routine usurp control over the transmission.
__________________
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
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#5
11-15-2012, 05:30 PM
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I was just about to post this exact same question, sort of. I was questioning the 2000-2500 rpm shifting (under normal driving) and having to pull back a gear on hills.
How can you tell how much tighter your bowden cable can go before breaking it? Such a small cable, don't want to pull too hard on it and rip it out of the transmission. I would like to delay the shifting just a little bit more but I think I am out of cable.
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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#6
11-15-2012, 06:28 PM
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The 85 300TD manual states:
"S" Slope. Upshift to 3rd gear only. Suitable for meduim range up or down grades. "L" Low. Upshift to 2nd gear only. For driving in mountainous regions. Since Transmission will not shift up any further, this gear will make use of the engine's braking power. I have always used S (3rd) a good bit here in West Virginia, western Maryland and western Pennsylvania. MM
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05 Passat TDI Wagon, 155k miles 05 Tacoma, 135k miles 96 F-250 7.3, 225k miles 85 MB 300TD, 275k miles 52 Dodge M37, 4BTA powered 52 Dodge PW, 23k miles 40 Ford Tudor Sedan (parts everywhere) Last edited by mozark; 11-15-2012 at 06:36 PM. Reason: spelling
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#7
11-15-2012, 07:06 PM
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I pretty much only manually shift my 190d conversion, you need to precisely meter the power through each gear in every situation or else it leads to bogging and double shifting back down if you have to slow down slightly ....gotta be paying attention with 73hp.
 Stark difference from the 420...that can accelerate uphill....in 4th.....at 35mph/1500rpm....without breaking a sweat....
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#8
11-15-2012, 07:59 PM
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Quote:
If it upshifts too early, the Bowden cable needs to be tightened slightly. When properly adjusted, the upshifts are delayed based upon pedal position. If you're on a slight upgrade in third and are trying to accelerate, the transmission should never shift until you get well over 60 mph. Absolutely no need to manually shift unless the cable is adjusted on the slack side for fuel economy purposes.
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#9
11-15-2012, 08:08 PM
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The issue as I see it is that if you are climbing a steep grade in third and have to slow down due to traffic and you let up on the pedal, the car will upshift. Manually controlling the shifter avoids this.
__________________
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
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#10
11-15-2012, 08:08 PM
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Quote:
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#11
11-16-2012, 08:32 AM
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Brian/Kerry/ et all,
Thanks for the responses. So yeah, when climbing a hill, taking my toe out of her, it tends to shift to early and bog (having fallen out of the "happy" zone on the tach). A turning vehicle in my path etc, where I simply get off, then back on the "gas", would causes the (early) up-shift. Getting the Tx attention seems to require putting my toe WAY back into the pedal......which may be symptomatic of the loose Bowden cable(?) Holding the car manually in third has the desired "holding the proper gear" affect during the on/off/on of the accelerator pedal. I'll add the cable adjustment to my list of "to-dos".... Thanks again.
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