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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

Eng Refresh + LMA, Brake OH, etc 38

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Vacuum leak check of the cooling system.
It's so cold that I couldn't get really low vacuum but enough for this testing.








Re-connected the battery the day before but even after straightening the GND cable, it already took set and looked like twisted before.
The more I looked at it, the more I hated it and also the way the aftermarket wires connected at the positive terminal.
Also, the GND cable cramp was already overtightened many times that the cramp itself was already damaged.








Even after using my nice Knipex plier-wrench that doesn't leave any markings, I didn't like these poor looking terminals so replaced them at the positive side.







New GND cable installed and no longer twisted like in 'S' shape….
Next time, probably best replacing that very rusty hyd pipe holder.....








As mentioned many times, if done properly, you should see small gap left when you tighten the GND cable cramp.









After leaving for about 1Hr, no changes in the vacuum reading so happy with the result and time to vacuum fill the Type 2 blue coolant.







Hand cranked the engine many times followed by short burst of starter cranking and then the proper continuous cranking to raise the oil pressure.
No press warning light and enough pressure raised so happy to install the spark plug and IG coil.
Applied silicone grease to prevent further rust especially at the rear bank ones.







After initial bleeding, quick 30sec fire up to shift the remaining air in the heater line.








Another bleeding followed by proper fire up.




I must adjust the base idle rpm, fluid level, etc and then take compression so still lots to do but already happy with the very smooth sound of engine.


Short break and start again tomorrow.



Kaz










Comments

  1. nikey22's Avatar
    Kaz, out of curiosity I've noticed that 3 out of 4 of the motor mounts are aluminum, but the passenger side engine mount (black) is not. At least there is some hint of rust on it, so possibly steel.
    Any reason/thoughts as to why?
  2. Kaz-kzukNA1's Avatar
    Very likely to be the design requirement due to target weight, limited space and most importantly, the future services.

    With ACG mounted inside the V-bank and the Eng close to the side frame, not much space available yet it has to be able to move away when tilting the engine.
    So, the designer came up with that narrow hanger style solution.
    Considering the thickness of the material and the way it holds the weight, probably had to use cast iron.

    There are many places on our NSX that the designers thought about the future services and applied clever design.
    For example, the mounts, sub frame fixing bolt hole design, etc, etc.

    As a side note, some of the aftermarket headers are not suitable for tilting the engine during the TB service.
    The rear bank header will hit the rear cross beam or some of them won’t allow removing other bolts on the rear member.
    Of course the OEM manifold and header are designed with this in mind.
    This was one of the most important factor when I researched the aftermarket headers for my NSX.


    Kaz