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#1
03-10-2012, 03:52 PM
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'80 300TD slipping in 4th
Slipping in 4th, not flaring, although there is some at 2-3 and 3-4. Slipping occurs when the engine is loaded, primarily uphill with too much throttle. It will also slip on the flat with too much throttle. This slipping occurs long after the 3-4 transition, whether there is a flare or not.
What should I look for? I don't want to wait for major damage. Letting up on the throttle stops the slipping. Transmission fluid doesn't smell burned, very clean. If the rain will let up I will disconnect the modulator and see how it shifts. Good ideas appreciated! snapped_bolt 
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#2
03-17-2012, 01:29 PM
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Green "dashpot" needed!
This car is a recent purchase. It's my daughter's daily driver.
Looking over the under-hood situation, I find NO green dashpot (damper) for the vacuum control valve! Good news- vacuum control valve looks NEW. Possibly not hooked up right. The VCV output looks to be running to the cabin... Searching for diagrams... snapped_bolt
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#3
03-17-2012, 05:47 PM
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The 1980 -300TD is probably vacuum-only, so if the vacuum is not adjusted correctly, strange things will happen to the shifting. The green dashpot is a later addition, certainly install it, but the absent of the dashpot does not cause slipping.
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#4
03-18-2012, 06:08 PM
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I thought I had read that somewhere...
...that there was no green "dashpot". There isn't a "bowden cable" either, so I imagine that the vacuum delivered to the modulator will be that much more critical. As soon as I am able I'm going to hook it up according to a diagram and start checking vacuum readings. It's just sad thinking about that new- looking vacuum control valve hooked up to nothing but the door locks-or whatever it may be connected to in the cabin. No wonder the PO was grumbling about the shifting! I did pull the side cover off the VCV and it has an adjustment feature. The inside look clean enough to be new from the factory.
snapped_bolt
__________________
'81 240D For now, a good place to borrow new parts '80 300TD Probably will be put back into service! '79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....
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#5
03-18-2012, 07:19 PM
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Vent line for VCV typically terminates in the cabin.
__________________
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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