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Northstar Engines and System Technical Discussion Discussion, Now what do I do? Northstar block casting porosity in Cadillac Engine Discussion; Here's a tip when working with threaded fasteners and various epoxies - either liquid or the various pastes thickened with ...
  1. #16
    Submariner409's Avatar
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    Re: Now what do I do? Northstar block casting porosity

    Here's a tip when working with threaded fasteners and various epoxies - either liquid or the various pastes thickened with silica, metal dust, or microballoons ............ If you want to refresh or create new threads using epoxy paste, go ahead and patch/partially fill your damaged hole. Thoroughly wax and wipe off the fastener threads and an inch or so of the shank - Simoniz seems to work best. Thread the fastener into the epoxied hole and let it cure. Once the epoxy has completely cured the fastener will unscrew out of the perfectly formed threads in the epoxy. Clean the fastener threads with lacquer thinner before using a thread locker.


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    Re: Now what do I do? Northstar block casting porosity

    WHOOOHOOOO!
    Its all back together and slung to the lift ready to go in…. but what’s this? 2 broken wires I discovered while de-greasing the engine compartment. Must have happened when I pulled the engine. The wires I refer to are quite small and connect to the “Vehicle Speed Sensor”, located on the A/T’s Final drive snout.
    My question is:
    Are the broken wires a resistant type that the entire length must be replaced or can I simply splice them back together and be good to go?
    CadillacLuke24 likes this.

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    Re: Now what do I do? Northstar block casting porosity

    I think they are just wires and you can splice them.

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    Re: Now what do I do? Northstar block casting porosity

    That’s what I’m hoping Ranger. A little solder and some heat shrink.
    I would be willing to guess those little buggers route thru the main harness to the PCM.

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    Re: Now what do I do? Northstar block casting porosity

    Good work! Let's see her in all her glory when you're got everything back together!

  6. #21
    rbb
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    Re: Now what do I do? Northstar block casting porosity

    I had a similar problem on my '05 engine swap, except I caught it before they snapped. Those wires run through the harness you may need to spend several hours trying to find any shorts caused by pinched wires and then using high-heat resistant electrical tape to repair the damage. Or spend $1327 on a new harness from www.newgmparts.com the short I had caused the ignition system fuse to blow whenever it drove a certain speed causing the car to stall while driving.

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