Help! I recently bought an 84 CUCV. Someone had removed the VRV from the pupm and attached a vacuum line directly from the vacuum pump to the modulator. Needless to say the 400 didn't shift right. I bought a new VRV from the dealer, but when I got ready to put it on, there is nothing on the pump to operate it. The bolt holes are there, but there is nothing on the end of the throttle shaft to work the VRV. What is supposed to be there? The only pictures of a DB2 I could find were not real good, but it looks like there should be a roll pin or something through the shaft to turn the VRV. Does anyone have a good picture of the passenger side of a DB2


Sorry for the long post

Hmmm... I'm not familir with the DB-2 to t400 set up, I have the nv4500. My manual doesn't show anything specific. You can PM Diesel Pro or Texas Diesel Guy for professional pump related experience. or one of the member's with this setup could post a pic.

there is a roll pin, its included in every gasket kit, fuel shop will give you one, they should anyway, everyone i've ever been in has dozens lying around.

The pin Texas Diesel Guy speaks of is a solid, silver colored pin with the center section serrated (knurled) to increase the diameter and make it a "press fit" in the hole in the end of the throttle shaft. Please support the end of the shaft when you press/tap it into the shaft. It is possible to slightly bend the shaft! The pin is available from any Roosa Master repair facility. It comes in the overhaul gasket and seal kit for the DB pumps. After installing the VRV, it can be adjusted using the slotted mounting holes to tailor the upshifts. I usually end up setting it all the way to the end of the slots, giving max vacuum to the modulator. The VRV is a built-in vacuum leak. By that, I mean it will bypass some of the vacuum from pump. The pump generates too much vacuum for the modulator, so the VRV lowers the signal to a workable level. Unfortunately, sometimes this level is not enough. I've seen new VRV's put out below 10" of vacuum even when adjusted to the end of the slot. If this happens, get the supplier to give you another. The transmission needs enough vacuum to allow low speed, light throttle upshifts. Good Luck!