Nissan 370Z Forum - View Single Post

Jhill · 04-17-2018, 02:31 PM

Quote:

Originally Posted by jmroy6

So when i did the oil galley gaskets, it seems the timing was off on the primary chain (did not remove secondary chains) during assembly. A few symptoms:Car would not start, studdered and immediately died. I did a compression test and only got 100psi per cylinder, this indicated both banks were out of sequence due to improper intake/exhaust timing on compression stroke.

So i disassembled the car again, to check timing. this is what i got.

Car is set to TDC Compression stroke (cams face up on both banks)

Bank 1 and 2 secondary chains time out (compression stroke)

Bank 1 uses punched marks on outside facing sprockets,

Bank 2 uses the oval marks on outside facing sprockets,

It may be hard to tell from the picture but either bank 1 or bank 2 is off a tooth, in person you can tell the cams are not facing up and out at the same degree for each bank. indication a bank is off a tooth.

This leads me to my question, if both cams are timed out on compression stroke, and cylinder one is at TDC. i should be fine to remove the primary chain (which is not timed/ or aligned with the colored links on both banks & crank). i can realign them to the designated marks on both banks and crank to ensure proper timing since the secondary chains are timed out already? Does that make sense? I don't really want to have to take this apart for the third time, i hoping i can learn from my mistakes and others can too.

this is straight out of the FSM:

Install timing chains (secondary) and camshaft sprockets.
NOTE:
Figure shows bank 1 (rear view).
A : Camshaft sprocket (INT) back face
B : Orange link
C : Dowel groove
D : Matching mark (oval)
E : Matching mark (2 oval: on front face)
F : Matching mark (circle)
G : Camshaft sprocket (EXH) back face
H : Matching mark (2 circle: on front face)
I : Timing chain (secondary)
• Align the matching marks on timing chain (secondary) (orange link) with the ones on intake and exhaust camshaft sprockets (punched), and install them.
NOTE:
• Matching marks for camshaft sprockets (INT) are on the back side of camshaft sprockets (secondary).
• There are two types of matching marks, the circle and oval types. They should be used for the bank 1 and bank 2, respectively.
Bank 1 : Use circle type
Bank 2 : Use oval type
• Shape (orientation of signal plate) of camshaft sprocket (INT) varies depending on the bank position. See the right figure to install.

I believe I understand your question and your answer would be yes you can remove the primary and re time it if a bank is off. If you didn't remove the secondary chains then the intake to exhaust cam timing for each bank should be correct. Not reading the FSM and I don't see it in the pics but there should be some kind of indicator to verify the intake and exhaust cams are in alignment but if you never removed those chains then they would have to be correct. Once those are set you couldn't just have one cam be off you would have to have both intake and exhaust be out of time. So with that said yes you could get the engine back to tdc, remove the primary chain and then re time the engine. If the intake and exhaust cams are in alignment and the primary chain aligns the intaks to the crank then that means your exhaust will be in alignment as well. Hopefully that makes sense, I've not done this particular engine but it's no different in design that others excepte for if the vvel gets screwed.