XK140 firing order

[Mac]

I seem to be finding conflicting information for the cylinder order on an XK140. Some say cylinder 1 is nearest the radiator and some say it's nearest the firewall. Is there any place I can look at a schematic that not only shows cylinder number but it's coresponding location on the distributor cap? Mac

 

[jessebogan]

On all Jaguar XK engines the number one cylinder is nearest the firewall. If you remove the number 1 plug and "bump" the engine over with your finger over the plug hole, you can easily tell when that cylinder has compression. Align the timing marks on the crank damper(or flywheel if so equipped), remove the distributor cap, and where the rotor points is number 1. hope this helps

 

[John S Farrington]

The number one cylinder is the rear most contrary to in front. The position for the number one spark plug lead on the distributor cap is at the eleven o'clock position as you look down on the distributor from the passengers side. The "one way" dog of the distributor to its drive should be set up that way when the engine is assembled. Occassionally this was not done properly during rebuild and allowances have to be made for proper timing. As Jesse said, you have to align the position of the number one spark plug wire with the position of the rotor when the number one piston is at TDC and in compression.

 

[Mac]

Thank you both for the help. In addition to the firing order, according to my manual, it looks like I time the engine on cylinder #6. Is that your understanding as well. Mac

 

[DrEntropy]

Hiya Mac, all,

According to the factory manual: "1,5,3,6,2,4" and "No. 1 cylinder being at the rear of the engine unit."

John has seen the same thing I have: On reassembly there have been "liberties taken" with so many of these units, no guarantee you have a properly aligned dizzy "dog". But with the "finger method" or correct dial indicator setup and cam observation you can determine #1 compression stroke and distributor #1 rotor location.

Timing from #1 would be the same as using #6... 180 degrees apart at firing, (SHOULD be) same place/position in rotation of crank.

 

[Mac]

Thanks for all your help. It started right up once I had everything lined up properly. I was amazed. It had not run for 25 years. Idles smooth, good compression and oil pressure. Mac

 

[Steve]

These guys are the best when it comes to Jaguars. I am pleased that she's running so well.

 

[DrEntropy]

Awright Mac!!! Great news!

Glad to hear another one lives.