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620crumudgeon

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About 620crumudgeon

  • Rank
    Newbie

Profile Information

  • Location
    Salem, Oregon
  • Cars
    1976 620, 1982 VW Westphalia, 1992 Alfa Spider
  • Interests
    Reading, bicycling, woodworking, the outdoors

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  1. My rebuilt L20b still diesels when turned off. It has the siamesed factory intake and exhaust manifolds and a Weber DGEV 32/36 carb. The exhaust manifold was replaced with a tri-Y header going to a new 1 3/4” exhaust system. The factory intake manifold was retained. When the exhaust manifold was replaced with a tri-y header the DGEV 32/36 was rebuilt as it appeared to be leaking gasoline - there was gasoline in the intake manifold when it was removed. I don’t know if jetting is relevant, but if it is the DGEV’s jets are: - Air correction jets - Primary: 170; Secondary: 160 - Emulsion tubes - F50 for both Primary and Secondary - Fuel jets - Primary: 140; Secondary: 140 - Idle jets - Primary: 60; Secondary: 50 - Auxiliary venturies - 3.5 for both Primary and Secondary - Auxiliary Jet: 5 - Float adjusted to spec. The carb’s adjustments are: - mixture control: 2 1/2 turns - idle speed control: 1 1/2 turns At 2 turns on the mixture control screw the engine bogged down while driving. The L20b pulls 15” of vacuum, compression is 160# on all cylinders, and leakdown for all cylinders is less than 20%. How do I eliminate the deiseling? Would the carb need to be rejeted? John
  2. I’m replacing the driveshaft center support bearing on my 620 and can’t remove the flange at the end of the front driveshaft. The nut holding the flange to the driveshaft was loose - I removed it with my fingers. I figured a few hammer taps would knock the shaft from the flange. After banging on it with a 4# hammer the top of the splines are an 1/8” below the top of the hole in the flange. I’m glad the new bearing has a new nut to replace the now deformed original nut. I though about having the shaft pressed out but I realized I would have to press the flange on the the driveshaft. Should I press the flange off and on the front driveshaft or find a used front driveshaft? John
  3. The Datsun June get together lives! It brings people together and builds a strong community where we help each other and provides a venue where we can appreciate the time money and ingenuity spent on our vehicles. It appears that kids aren't as interested in cars as they have been. Could we encourage interest by introducing the Datsun community to high school and college students at the get together next year? If they know there is a community that supports their interest in Datsuns and Nissans they might keep the flame going for our vehicles. John
  4. Being a first time attendee I was impressed by the diversity of vehicles, the interesting swaps, ingenuity and people I met. It’s a good gathering. John
  5. The steering gear box on my 620 is leaking from the front where a metal disk covers the worm gear bearing at the end of the steering shaft. Can the leak be stopped by cleaning the leak area and liberally applying JB Weld? Yes, it is a kludge of the first order, but I really don’t want to pull the steering gear box. John
  6. The temperature sensor for the fan controller is in the thermostat housing where it can read the water's temperature. The cooking thermometer is used to read the temperature of the water flowing through the radiator. The probe tip is between two cooling passages near the radiator inlet. The three temperatures I'm interested in are: 1) the fan turn on temp; 2) fan turn off temp; and 3) maximum permissible water temperature. The fan turn on temp should be below the maximum permissible water temp to provide a margin of error. John
  7. I've replaced the L20b's mechanical drive fan on my '76 620 with an electric cooling fan. The turn on temperature set point is adjustable and I need to know the temperature at which the fan should turn on and the maximum water temperature. I will be inserting a temperature probe between the radiator cooling fins connected to a cooking temperature gauge that's accurate to 1 degree F. Should the fan tern off temperature be less that the thermostat temperature rating? The thermostat is a 180 degree thermostat. John
  8. I've broken the heads off bolts that are nuts attached to body panels. The broken screws are flush with the nuts attached to the body panels. If a torch is used to heat the nuts the body panels will distort. Any liquid such as PB blaster applied runs down the panel. I could soak a small piece of cloth with PB Blaster and tape it over the broken bolt, but I still need a way to grab the bolt. Yes, I should have anticipated that the bolts would break and soaked them with PB Blaster before they were removed. How does one remove the broken screws? John
  9. Thanks for the quick reply. Is 48137-36700 a Datsun part number? John
  10. My 1976 620’s steering sector shaft seal leaks. Does anyone know the part number of a replacement seal? John
  11. The problem is very simple, missing bolts that attach the transmission to the engine. I don't know if replacing the bolts will fix the problem, but that's the obvious place to start. Does anyone know the sizes of the bolts that hold the engine and transmission together? My son was responsible for mating the transmission and engine; this is a great learning opportunity for him. Professionally I've been doing software quality assurance (QA) and test for mission and life critical software and understand consequences of poor QA. This is a great opportunity to demonstrate the consequences of bad QA. I was lucky that the problem occurred at home.
  12. My son and I have rebuilt the mechanicals on a 1976 620 long bed and installed Beebani’s disk brake conversion. The truck drove great for a couple of hundred miles until the clutch started to drag. When the clutch was depressed a rubbing noise was heard which has diminished but has not disappeared. The throw out bearing lever was loose when the clutch was not depressed. The clutch release point was at the end of the clutch pedal travel then it moved to the start of the pedal travel. The slave cylinder is putting pressure on the throw out bearing lever. When in gear power is applied the clutch slips. The clutch, pressure plate, throw out bearing and clutch master cylinder are new. What could be causing my problem? I’m assuming the transmission will need to be pulled and I am not really looking forward to pulling it.
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