Discussion:
Caterpillar T70C Ignition

Can anyone tell me which distributor lug is for number one cylinder on the straight six engine in the above cat.
Ours has no numbering, so if you know and can describe it as being "third one clockwise from cap notch" or something similar I would greatly appreciate it.
Also I believe that the firing order is 1-5-3-6-2-4 counter clockwise from number one. Can anyone confirm?
Serial number is 33L1129
Thanks in anticipation.
  • Posted 10 Oct 2012 05:38
  • By BoatGuy
  • joined 10 Oct'12 - 2 messages
  • Florida, United States
Showing items 1 - 5 of 5 results.
The method I use is the following: Shut off fuel & purge (if LPG) ,Remove all spark plugs, remove dist. cap, place 1 finger in #1 spark plug hole ( if #1 is difficult to get to, any hole will due, just make a note of which cylinder you're in), crank engine over for about 5-10 seconds, watching where the rotor is when compression pushes against my finger.
  • Posted 11 Oct 2012 01:22
  • By bbforks
  • joined 1 Mar'12 - 1,437 messages
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
remove the #1 sparkplug
hold your finger over the plug hole and bump the engine over till you start to feel the compression start to force its way out of the plug hole.
THEN....
look at the harmonic balancer or pulley on the crank and watch for the timing indicator, and by hand you can turn the engine till the timingmark lines up with the indicator on the front cover, this should be TDC. You can then look at the distributor and see where the rotor is pointing to the #1 plug wire.

I would also take note of rotation of the rotor to make sure if its counter clockwise rotation or not.
You can then decide on the order of fire when putting on plug wires.

this method is tried and true and there is no guessing at it
  • Posted 10 Oct 2012 20:43
  • Modified 10 Oct 2012 20:48 by poster
  • By swoop223
  • joined 23 Mar'12 - 3,691 messages
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
On that motor, you may be able to see the piston. Have someone turn it by hand.
  • Posted 10 Oct 2012 07:18
  • By mrfixit
  • joined 11 Dec'08 - 1,434 messages
  • New York, United States
Thanks for the prompt response.
I have tried several attempts like this but with the stroke being so short, it seems like you can't get it to consistently "stop" in the same place.
I will keep trying though, but I was rather hoping someone already had one to look at !!!!
  • Posted 10 Oct 2012 06:57
  • By BoatGuy
  • joined 10 Oct'12 - 2 messages
  • Florida, United States
Look at the rotor and click the key to see which way it spins. The firing order is 1-5-3-6-2-4. Leave the cap off. Take out the #1 spark plug and install a compression gauge, or better yet, stick your finger in the hole. Carefully, and not air tight. Click the key over to start, and release it as quick as you can. When the gauge moves it is coming up on compression #1. Look at which lug in the cap the rotor is pointing at. Install #1 plug wire and circle around with the rest of them.
  • Posted 10 Oct 2012 06:40
  • By mrfixit
  • joined 11 Dec'08 - 1,434 messages
  • New York, United States

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