View RSS Feed

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

Cooling Sys, ABS Upgrade, etc 14

Rate this Entry














As I have no idea how much carbon is already built up at the #1cyl as well as possibly at #2cyl as well, decided to set the clearance at but wider end of the spec.










Although it says 'triple checked', I actually checked all the torque and clearance 4 times as I didn't like doing this task with the eng inside the bay.....











As I already knew that the cam pulleys were alined properly but not the piston/crank, black carbon and also the concern about the low compression, wanted to see inside of the cyl.

Very wet oil at the top of the piston. Probably through the valve stem seal.....

I took all six cyl photo and as expected, #1cyl was the worst but couldn't check the cyl wall as I couldn't bend the bore scope enough.
Obviously, can't see the vavle seat section.....












And this revealed another issue as mentioned in my previous blog.

At that time, I added the comment on one of the photo that despite the cam pulleys were already at TDC, the marking on the crank pulley was behind.

Well, the bore scope told me the different story......

The piston was already past the TDC point under the same condition when I took that photo the other day.......

So, I had no option but to check how the crank pulley and woodruff key were installed.


Immediately, I noticed the issue when tried loosening the crank pulley bolt.

It started to rotate at very low torque and immediately, I found out that it was cross-threaded that someone just stopped tightening there.

And even worce, there is something wrong with the woodruff key.

If installed properly, it's a very tight fit against the crank shaft, tb drive pulley and the crank pulley so there is no way the crank pulley can move like in the video.

I just hope there is no damage to the slit/slot on the crank shaft, the TB drive pulley stays put and just the damages on the woodruff key....

It's too dangerous for me to try removing the cross threaded pulley bolt without first removing the TB or the all four cam shafts and I won't do it while keeping the eng inside the bay.









Updated 18-06-2018 at 03:13 PM by Kaz-kzukNA1 (font)

Categories
Engine/Tyre

Comments

  1. solidol's Avatar
    It's a shame people like the previous tech work on cars. NSX deserves better than this.
  2. britlude's Avatar
    O.M.G. on the bottom pulley!!!!!!
  3. NSXGB's Avatar
    That happened to my old V6 Capri. I think the pulley bolt came loose and the woodruff key gradually worked the keyway larger. I had to strip the engine down to get the keyway welded up. What a pain in the bum.