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#16
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Quote:
John
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Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#17
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I read on a different thread on the same topic that the modulator leak could be caused by the rubber cap on it. Mine is cracked around the edges, new one is on its way.
John
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Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#18
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That's not your major problem, however. The 14" of vacuum is too high. There is a small domed cap on the side of the VCV. Pry this cap off carefully and you'll find a slotted screw beneath it. Some have a locknut.......some don't. In any case, you wish to turn the screw about five degrees..........NOT MORE. Connect the Mityvac and pump it up to 14" and turn the screw very slightly. Pump it up again and observe the gauge. If it's now 12"........you're moving in the right direction. Turn it a bit more until it reads 10" when you pump it up...........then STOP. Return the cover to the VCV and take it for a test drive. If you don't know what you're doing...........DO NOT randomly move the adjustment screw or you'll destroy the VCV. |
#19
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Brian;
My VCV had a locknut for adjustment. I adjusted it so now my vacuum reads 10" to the modulator. Test drive resulted in firm 1st to 2nd shift, 2nd-3rd ok, but 3rd to 4th flared until I backed off the pedal. John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#20
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Only hope is to adjust it down to 7-8" and hope the 1-2 doesn't start to bang. Another possibility is a modulator adjustment, but, that's a last resort. |
#21
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I'll run out quick and try the 7-8" vacuum before it gets dark. Thanks. John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#22
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It's going to be a compromise........no matter what we do with it. |
#23
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Brian;
Vacuum to modulator now a 7". 1st-2nd not too hard, 2nd-3rd better, flare between 3rd-4th much less. Now what? Thanks again. John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#24
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I'd drive it like that to get some additional data. If it's still a problem, reduce vacuum to 5". It's going to start to bang on downshifts somewhere along this process............
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#25
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Quote:
John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#26
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Quote:
How's the 3-4 upshift? How's the 3-2 and 2-1 downshifts? Any banging? Clearly, if we cannot get to a satisfactory compromise, the clutches and bands need replacement. But, usually, with proper tweaking, they can go for awhile. |
#27
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Brian Why is modulator adjustment a last resort? I thought it was part of the overall strategy, used in combination with the other tricks? Tim
__________________
2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
#28
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Quote:
John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
#29
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Therefore, I don't recommend it unless we've exhausted all vacuum remedies. |
#30
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Brian;
Since my modulator has a slow leak, will replacing it make any difference in my shifting? If I do replace it, what are the pressure settings for an 83 300SD? Driving it tonight, downshifts are smooth, 1-2 is firm, 2-3 is ok, and 3-4 is marginal if I don't lead foot it. John
__________________
Certified Registered Nurse Anesthetist (CRNA) 2002 F250 powerstroke with Plantdrive WVO conversion 1983 300SD 190K miles ,sold 2006 E320 CDI |
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