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Diesel tach?

Discussion in '1982-Present GM Diesel' started by tRustyK5, Nov 14, 2002.

  1. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I really like having a tach...does anyone make one for the diesel? If so how do they work? Mechanical somehow?

    I'm /forums/images/graemlins/ears.gif /forums/images/graemlins/ears.gif

    Rene
     
  2. imiceman44

    imiceman44 1 ton status

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    Tiny Tach
    Diesel Timing light
    These are a couple of items I had found for Diesel.
    I had more but can't seem to find them now.
    I will add more as I find them.
     
  3. imiceman44

    imiceman44 1 ton status

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  4. azblazor

    azblazor 1/2 ton status Premium Member

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    Arizona, Phoenix area
    I use an Auto meter 2888 2-5/8" Diesel Mini Tachometer
    5,000 RPM full-sweep dial. A small inductive pickup probe straps to alternator. A 6,000 RPM Diesel tach is also available (see 2308)- they cost from $110 - 130 depending on where you find them.

    Here is a relavent post from thediesel page on using a gas tach:

    posted 10-04-2001 08:13 PM
    Some details on using the optical sensor to run a gas tach. The sensor is an Omron EE-SB5V-E available from Digikey. Their part OR519-ND it is very small, about 1" X 1" !!!
    The tach I used is a VDO, 4/6/8 cyl selectable.
    I painted the edge of the harmonic balancer (it was already black, if yours is not, paint the edge flat black) Tape off three sections, 4 inches long, separated by three sections 4
    inches long. Paint the three open sections flat white. You should now have alternating white-black "stripes" on the balancer edge.
    To be exact, wrap a string around the edge of the balancer, measure it and divide by 6. subsitute this measurement for the 4 inches. The sensor mounts with 2 holes in the timing
    "tab". On my older 6.2 it was a perfect fit. I drilled the holes to allow a #4 sheet metal screw to engage the tab and hold the sensor about .1" from the balancer. The sensor has four pins marked + - L OUT
    The + wires to a switched 12 volt source.
    The - goes to ground.
    The L goes through a 3K ohm 1/4 watt resistor to the - pin. Radio shack sells these.
    The OUT terminal goes through a 620ohm 1/4 watt resistor to the + terminal.
    Also, from the OUT terminal a wire goes to the Tach input connection.
    The resitors can be mounted right on the sensor. Tape each pin, and seal with silicone
    "goop" (non conductive type)when finished.
    Set the tach for 6 cyl (3 pulses per rev)
    Email with questions k3tv@arrl.net
    Chet
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Most excellent!!! Bookmarked all the links! Thanks guys! /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif

    Rene
     
  6. DieselDan

    DieselDan 1/2 ton status

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    The HMMWV uses signal generator in place of the vacume pump (no vacume). It's tied into the diagnostic harness (STE-ICE, CTS, SPORTS all that crap). The generator looks suprizingly like the tach generator on a Detriot Diesel 8V92 in a HEMTT. /forums/images/graemlins/wink.gif
     

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