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

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3rd round of valve clearance adjustment done for both
the Front and Rear banks.


After hours of careful adjustment, finally, I’m happy with the result.




New oil cooler with replacement o-rings installed.
At the same time, replaced 2 x coolant hose and cramps.
So much better compared to the original state below.

Because it's an oil cooler, I don't know whether it is a good idea painting it
in order to prevent future corrosion.
All I can do is to apply silicone grease all around the body and just delay the
first sign of the corrosion......
If you have any recommendation, please let me know as I'm quite sure
as our NSX gets older, more owners will suffer from the same issue.




Started to close the engine.




The famous crank pulley.
MUST item to be replaced at the time of every TB service
regardless of the mileage.

Torqued to the spec with pulley bolt properly treated to prevent seizure
until next TB service.




The important rubber seal around the TB tension adjuster bolt.

Can you see it on your engine?
Probably damaged or missing on yours allowing moisture and
debris entering the TB area.....





Comments

  1. pralognan's Avatar
    The Denso oil cooler is made from stainless steel,can't remember which grade,but obviously not stainless enough! It would be a good idea to paint it to slow the corrosion. Black would be best, it would actually help heat dissipation,but not by much! certainly would do no harm. (Retired Denso engineer)
  2. Kaz-kzukNA1's Avatar
    Hi, pralognan.
    Thank you for sharing your knowledge.

    From what I was told while I was in Japan and also looking inside the spare oil cooler, it’s some sort of copper alloy structure with outer surface chromium plated.
    Not sure about the top hat material though...
    It just gets so much corrosion over the years.....









    So many fins in small space....
    No wonder why it's so expensive and quite often, on back order....

    Kaz


    Updated 14-04-2014 at 11:33 AM by Kaz-kzukNA1 (Additional info)
  3. pralognan's Avatar
    Dear Kaz,
    The oil cooler is made from a stack of stainless steel pressings with a thin copper "shim" between each layer. The stack is then housed within a stainless steel "pan" and "lid" with further copper shims.The assembly is clamped and brazed in a vacuum furnace at a temperature where the copper melts and seals all the joints. Your photos show the copper braze holding the plates together very clearly. The Nippondenso OE selling price to Honda would have been about £20! We should have spent a few more pennies and specified a higher grade material for the lid!
  4. Kaz-kzukNA1's Avatar
    Hi, pralognan.
    Thank you for the extra info.
    Now I understood why there was so much corrosion at the top hat.
    I haven't checked whether the magnet can stick to the oil cooler or not but probably it's made from SUS430.
    I studied basic material engineering at Uni and it helped me a lot when I studied lots and lots of aftermarket header/back box spec and design.
    Not sure the best method to paint it so I'll keep applying the silicone grease for the time being.

    Kaz

  5. Senninha's Avatar
    Interesting discussion .... would applying extra heat damage the copper seals? I'm thinking if you could have it powder coated where they use something like 200' to harden off the paint. Would this be too high and of so, what would be the safe maximum?

    Alternatively, how about using a good quality etching primer, several light layers to build up a good base, then several layers of high temperatue paint (color of your choice) to give a good finish??
  6. pralognan's Avatar
    The copper shims which form the brazed joints melt about 1100C,the stainless steel parts would melt in the range 1400-1450C.
    No problem with any paint system,apart from keeping the internal parts of the cooler clean and clear of any contamination.Also the external mating faces would need to be kept clean.You don't need to worry too much about HT paint, the coolant is there to keep the oil temperature at a moderate level. No comparison with brake calliper. Look forward to your colour scheme.
  7. Senninha's Avatar
    Thank you for sharing your knowledge ...
  8. Kaz-kzukNA1's Avatar
    Thank you for the precious info, pralognan.
    I’ll try painting mine when I can find some free time.

    Kaz