ABS Upgrade, Oil Cooler, etc 01
by
, 03-08-2018 at 01:50 PM (3318 Views)
Started to work on another NSX from last week.
The service menu is to carry out Health Check combined with Annual service, ABS Upgrade, Oil Cooler replacement, etc.
As always, started with the general check-up in preparation for the Test driving session before changing anything to understand the existing status.
While looking at the crank pulley, noticed strange offset.
No damages to the TB lower cover (yet) so decided to start the engine.
And the confirmation of the crank pulley failure.
Not sure exactly when it started but the weight was still held in place and couldn't detach it even using the pry bar.
As I normally keep at least one MT spec crank pulley at my place, replaced with new one.
From the service history, it was replaced by someone 5 years ago and only covered about 6,000miles during that period.
The owner mentioned that he only had one track day session.
I know another owner with crank pulley failing at very low mileage/age but had a few track day sessions.
On the other hand, there are many owners driving with old crank pulley with many miles without any issues.
For example, mine is 6 years old and covered 23,000miles and spirited driving but no track days.
I know this failure is heavily related to the sudden continuous acceleration and deceleration so in Japan,
owners who take their NSX on track always keep eye on the pulley and replace it at much earlier stage than
the owners who drive their NSX on street driving condition only.
Personally, I'll only approve the pulley shield design that won't utilise the TB lower cover 10mm bolts.
Once the TB lower cover and the surrounding gasket were heat cycled and took set, you don't want relaxing them.
Any way, glad that we managed to spot it in time before killing the TB resulting in bent valves.