Buick V6 231 sending unit location?

Discussion in 'Flat Fender Tech' started by Macgyver, Jan 16, 2016.

  1. Jan 16, 2016
    Macgyver

    Macgyver Member

    Arizona
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    I'm finally at the in-laws working on the CJ3A. I haven't been here in a few months. I pulled in the drive way, walked in the house and changed my clothes, to start working. Last time I was here I was trying to get her to start for the first time. It was back firing and I ran out of time and had to leave. I've been over thinking the problem since. I rechecked the distributor and I was 180 out. It fired right up, but started leaking oil badly, so I shut down. I thought I identified the oil sending unit location to be a vertical port on the back of the motor, like my small block chevy. The threads were correct for the sender. The oil seemed to be coming out of a horizontal port above oil pump. Is this a secondary port, or am I way screwed up. I promise to post pictures.

    Thanks, Cole
     
  2. Jan 16, 2016
    nickmil

    nickmil Super Moderator Staff Member Sponsor

    Happy Valley, OR
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    Oil port for the sending unit is on passenger side of block toward the front of the engine by the oil pump as you describe. No oil port where you describe yours is hooked up
     
  3. Jan 16, 2016
    Macgyver

    Macgyver Member

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    ok, thanks. I'm going to have to trim the motor mount, no enough room for sender. Any idea what port is on top of block in back of intake manifold? Thanks for reply.

    Cole
     
  4. Jan 17, 2016
    colojeepguy

    colojeepguy Colorado Springs Sponsor

    At the foot of...
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    If its on the intake manifold, it should be either coolant or vacuum. If you have a 231 intake, it could even be for EGR.
     
  5. Jan 17, 2016
    Macgyver

    Macgyver Member

    Arizona
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    It's on the top of the block, in back of the manifold. 350 Buick told me its a temp sensor port and to plug it. So I'll give it another try today. After I go buy some more oil of coarse. I pumped the oil pan out on the floor. Thanks, guy's
     
  6. Jan 18, 2016
    Macgyver

    Macgyver Member

    Arizona
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    I plugged the rear port and moved the oil sender. Filled up with oil and started up. Oil pressure was around 50 psi and temp got up to 190 degrees without running a fan.
     
  7. Jan 18, 2016
    Focker

    Focker Rust Never Sleeps Staff Member Sponsor

    Tri-Cities WA
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    How long did it take to get to that temp?
     
  8. Jan 18, 2016
    Macgyver

    Macgyver Member

    Arizona
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    I ran it close to 20 minutes at higher rpm for cam break in. Gauge seems accurate. didn't have a fan rigged up yet and no over flow tank hooked up, so radiator probably not 100% full either. Was using a plug in fan to supplement cooling.
     
  9. Jan 18, 2016
    Macgyver

    Macgyver Member

    Arizona
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    Took some pics today. image.jpg
     

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