260Z Firing order

[Shawninvancouver]

Is hooked up with plugs being wired to distributor as follows..  1 near firewall and 6 near fan...  is this totally backwards???? all the wires are numbered with little number tags and go in that order?? what is going on here?? can it be reversed somehow? or do i have to fix all wires to have 6 by firewall and 1 by fan???

[w3wilkes]

Lifted this from another thread. 260 is the same.

[Shawninvancouver]

so  mine is wired all backwards???  could the order ever have been changed???  what happened here???

[Zed Head]

You need to show the wires to the distributor to know if the firing order you used is wrong or not.

[Shawninvancouver]

i can not locate any mark to indicate no.1 spot on distributor... just going by the clamp on the top of distributor as 1. and its marked 1 on cable and goes to the plug closest to fire wall...

is there any other mark on distribtor i may be misssing to indicate 1?

[cgsheen1]

The distributor cap normally has a raised "line" in the plastic along the number one spark wire plug. None of the other plugs in the cap are marked that way so just find the one with the bump... The rotor at TDC faces nearly forward - toward the radiator - slightly offset to the left side of the car. There are pictures of all this stuff in the Factory Service Manual - Download it. xenons30.com or nicoclub.com

[Shawninvancouver]

Is 1 spot always at front of engine? Could it ever be 6 at front ?

[cgsheen1]

7 minutes ago, Shawninvancouver said:

Is 1 spot always at front of engine? Could it ever be 6 at front ?

No. Nearly every inline 6 cylinder engine uses the same scheme not just the L-series engines. Cylinder one is at the front and numbers in order to the rear of the engine - six is the cylinder near the firewall. The firing order is 1-5-3-6-2-4. All of this is determined by the mechanical build of the engine (crankshaft, camshaft, timing gears and chain). You need to be able to verify that the mechanical timing of your engine is correct. That is the position of the mechanical parts are as they should be - including crank shaft position relative to camshaft position and distributor (rotor) position. That's the very basis of your engine mechanics.

 

Edited June 5, 2021 by cgsheen1

[Mike]

I also had a strange situation with an old Z engine of mine.  The process took me FOREVER to figure out and I was about to push the car in the river.  Turns out the firing rotation was 180 off from normal.  I believe it was due to the fact the guy who rebuilt the engine aligned it incorrectly during the rebuild.  

Could this have happened with yours?

[siteunseen]

37 minutes ago, cgsheen1 said:

No. Nearly every inline 6 cylinder engine uses the same scheme not just the L-series engines. Cylinder one is at the front and numbers in order to the rear of the engine - six is the cylinder near the firewall. The firing order is 1-5-3-6-2-4. All of this is determined by the mechanical build of the engine (crankshaft, camshaft, timing gears and chain). You need to be able to verify that the mechanical timing of your engine is correct. That is the position of the mechanical parts are as they should be - including crank shaft position relative to camshaft position and distributor (rotor) position. That's the very basis of your engine mechanics.

 

When I was young my Dad rebuilt my '76 280. He was a Chevy man. Car wouldn't fire up and it drove him crazy. Finally asked a friend mechanic and as the firing order is the same Chevy's distributors turn clockwise. Ours turn counter clockwise. He came home, changed the wires around and it cranked right up.

49 minutes ago, Shawninvancouver said:

Is 1 spot always at front of engine? Could it ever be 6 at front ?

#1 plug wire isn't long enough to reach the firewall with my NGKs. Maybe they numbered themselves?

[Zed Head]

(Edited to avoid exploding heads...)

But, using the normal procedure is best, because then everyone else will understand it.  w3wilkes post is the one you want, but you need to set your timing mark at zero on the damper pulley and confirm that you're on the compression stroke, then make sure that the rotor under the cap is pointing at the #1 terminal.

Making sure the rotor is pointed at #1 is very important.  It tells you if the oil pump shaft and distributor is installed correctly, like Mike described.

Edited June 5, 2021 by Zed Head

[Mike]

16 minutes ago, Zed Head said:

you need to set your timing mark at zero on the damper pulley and confirm that you're on the compression stroke, then make sure that the rotor under the cap is pointing at the #1 terminal.

Yep that's the process I used to determine it was off.  Good luck!

m