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

Eng Refresh 12

Rating: 3 votes, 5.00 average.





While it will survive and fairly normal to see the potting melted away
on the CRK/CYL sensor, I don't feel comfortable re-using this so going
to replace it with a new one.




All inlet valve guides were fine that is a good news.

There were some oil there but no stain marking around the back of valve face/skirt
so it's very likely it came from the blowby and not through the valve seal.

One of the mystery with our NSX engine especially on the C32B 3.2L engine is the
failure of the valve guide but only at the inlet side.
Considering the number of C32B engines in the world, it’s somewhat high percentage
but it also happened at least on one C30A engine in Japan.
No worries for now on this C30A engine.








Removed the rear head.
There were a few loose head bolts compared to others but not too bad.
However, some of them smelt really bad with sign of condensation.
Gasket itself looked fine from this angle before peeling it.

However, there were build up of solid carbon noticed on both the head and the piston
(deck side) as you can see in the photo.
Probably the reason for the not perfect cold leakage data.




Peeled off the gasket and there were some suspicious brown spots but
gasket itself was intact.








Sprayed carb cleaner and the tiny wet marking around the inlet valves and
a few outlet ones are the proof although the engine is cold.

#2 looked to be having extra carbon than others.
This is the cyl that the spark plug showed somewhat super white with white deposit
than others.
Can’t do much without removing the valves and already discussed it with the owner.
All three cyl at the rear bank are showing extra carbon than normal engine on the
head as well as on the piston.





Someone left the broken exh manifold stud like this.
I’m glad that it came off with ease even after it got so rusty.




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