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  1. NMC_EXP

    Right tool for the job - a discussion of rig design and usage

    There are no perfect solutions. No matter what you do, at some level the end result is a compromise. That goes along with the version of Murphy's Laws for engineering. One of them is Zymurgy's First Law of Evolving Systems Dynamics which states: "Once you open a can of worms, the only way to...
  2. NMC_EXP

    Right tool for the job - a discussion of rig design and usage

    (f) Should satisfy most of your requirements. If the stock powertrain is worn out, rebuild it and enjoy. If you need more pulling power reduce tire height (and width) and save wear and tear on steering components in the process. Plus less rotating mass means marginal improvement in braking...
  3. NMC_EXP

    Rth. I’m stranded

    Excellent solution.
  4. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    Gak. I'm innocent.
  5. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    Good call. Most of the leaking seal joint post-mortems I did were on new equipment still under warranty. When I was working seals I had "static seals" such as o-rings. My coworkers had rotating/dynamic seals so I never saw a grooved shaft on the job.
  6. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    Thanks for the info. Rubber was my area. The little bit I knew about the metal side of the business I picked by working with the folks who had design control for the metal parts my rubber parts mated up with. Almost 100% of the time if a part with a seal in leaked, the seal got blamed...
  7. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    My pleasure. I was a rubber geek. I enjoyed my job and still like talking about it.
  8. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    That's interesting. Modern shaft seals rely on one or more rubber lips and may have a garter spring to keep the seal tight on the shaft. The rubber seals must have a very thin oil film between the lip and the shaft. A rotating shaft seal running dry will wear out quickly. Common practice...
  9. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    Think screw pitch. Blueprints for shafts and such that were lathe turned or ground often had a requirement for "no lead" (that's as in lead vs follow as opposed to lead bullets). Say in a lathe turn op the cutter was left against the shaft as it was withdrawn. The cutter would leave a spiral...
  10. NMC_EXP

    Wear on crank pulley oil seal surface diagnosis

    If its not grooved, just too rough I wonder if you could spin the shaft while holding a strip of Crocus cloth on the wear band? Observed a rotating shaft seal engineer colleague doing that on a lab seal test rig. The surface finish in contact with a rotating shaft seal needs the valleys to...
  11. NMC_EXP

    diff fill plug stuck solution

    I could not keep a socket or wrench on mine and was rounding it off. Finally broke it loose by placing a cold chisel on the outer edge at one of the hex points and tapping the chisel with a hammer. This after several soakings with Kroil. If its stuck too bad this might just remove more of the...
  12. NMC_EXP

    Seat Coolers

    Another option to keep your butt cool is the Kool Kooshion Ventilated Seat Cushion. I use them and they do help. Set you back $13.95. Then you can invest that big cost avoidance on fuel or something else you really need...
  13. NMC_EXP

    Brake lines - easy to forget these are old vehicles

    I believe you are correct - thanks.
  14. NMC_EXP

    Distributor Oil leak: Still leaking after Replacing distributor O-ring. Any ideas?

    All that I posted was "o-ring 101" general info rather than being specific to your situation. I spent the last few years of my career troubleshooting o-ring problems. Learned they are a deceptively simple piece of tech that can get you in trouble if everything is not as it should be. They...
  15. NMC_EXP

    Distributor Oil leak: Still leaking after Replacing distributor O-ring. Any ideas?

    If you need to replace an o-ring in any application if at all possible use the manufacturer's part. Next best thing is find out the actual "dash size" of the o-ring. It's next to impossible to measure an o-ring accurately using contact devices like a caliper or mic because the rubber moves...
  16. NMC_EXP

    Brake lines - easy to forget these are old vehicles

    I've had two steel brake line blow outs on old vehicles. Stomp on the brake and the pedal goes to the floor. That will definitely peg your pucker factor meter. One was a '67 GMC 3/4 ton and the other about a '70 Chevy Biscayne Like Tom T. Hall said in his song 'Wolf Creek Pass'.......hitting...
  17. NMC_EXP

    How to properly brake on mountain passes

    I've only looked at the first post. If it is a steep downhill put it in low range 4WD and keep it there. I've never owned an 80 series but with my FJ40 and FJ60 if 4WD was required for a trail it was always 4WD-Low. Mechanical gear reduction is not self sacrificial. Brakes are.
  18. NMC_EXP

    Is this oil behaviour is normal ?

    Just checked the climate in Lahore: Month..........Ave. Low.......Ave. High January...........43°F............67°F June...............81°F...........105°F 5W30 seems much to thin in that climate, especially for a diesel. Without knowing Toyota's recommendation I'd use 15W40.
  19. NMC_EXP

    Is this oil behaviour is normal ?

    With multi-viscosity oils such as 5W-30 and 20W-50, the first number (5W and 20W) indicate the apparent viscosity when the oil is cold. The second number (30 and 50) are the apparent viscosity when the oil is at operating temperature. Motor Oil Viscosity Grades Explained in Layman's Terms...
  20. NMC_EXP

    What are the Possible causes of back fire thru intake(SOLVED)

    Probably irrelevant to a modern engine but before electronic engine management the first branches of the fault tree analysis were: --backfire thru carb = ignition system problem --backfire thru exhaust = carb problem
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