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

Annual Service, Health Check, Brake OH 06

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The air cleaner element.


Just hold it against the sun or strong LED light. If you can't see through lots of light, just replace it.
This one is too dirty to be re-used. Also, it's the white spec one and not the latest green one so it's been used for so many years.
Replaced with a new one.






As I have never worked on this NSX, decided to take a look at the TH butterfly.
While the surface was clean, the edge and the inside of the TH body was really dirty.
So, decided to clean the IAT sensor as well.
Not too bad but already covered in sticky black gunk so cleaned it and replaced the o-ring.
As the owner decided to replace all coolant hoses, cramps, header tank, etc now, I think I'll remove the TH body as well to clean it thoroughly.




Not a big issue but sad to see the holder tab of the Front IG coil cables was damaged in the past.....






Existing spark plugs.
The thread of the plug at #1 cyl was covered in lots of oil. Inspected all six cyl using the mirror but no obvious leakage. Probably the seals at the plug holes were not replaced when the last time the valve cover was removed.


There were extra rusty marking (not the corona arching) on the insulator body of #1, 2, 4, and 5 cyl plugs.
Although they looked fine, we are going to replace all six this time.




Just extra rust at #2 IG coil but still, all six are very healthy. Applied silicone grease around the base, tube and just a little inside the tube on installation.






Time for the compression check.
The full data was already sent to the owner.
[psi]
#1: **0, #2: **4, #3: **7,
#4: **5, #5: **9, #6: **1


Similar data to other C32B 3.2L engine but quite surprised to see big deviation on such low mileage engine.
The OBD2 intake manifold pressure was very steady so very unlikely to be cam timing related and purely caused by the poor valve clearance adjustment or something around the valve seat.


For some reason, there is a service schedule for the valve clearance adjustment at every 3 years or every 27K miles whichever comes first on any Honda UK models (except Legend) registered on or after Jul/98.
For our NSX engine, I strongly recommend not to touch it until the time of TB service.
It's so hard to adjust especially for the ones at the rear bank unless you take the engine out.
I take compression on my engine every year and I see almost no changes in deviation pattern each time and even after 60K miles without valve clearance adjustment, the compression data between each cyl is still very close.


Health Check is done and will report the result to the owner later.
The only big question mark is the battery.
From the receipt, it seems to be 11 years old but the parts no. on the battery itself is -010HE so not the latest but can't be that old.
Cranking speed is strong and even after the compression check, the battery conditioner showed good healthy condition so just keep using it until you start feeling the slow cranking in the cold morning.




Moving onto the rest of the services.


Kaz

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