Nu-Rex wrench ???

W

wcmill

Member
Hey guys, was happy to receive my Nu-Rex timing wrench the other day…..not at all happy with it.
I’ve only owned my A for about a month, and am going through it from front to back as it had been sitting for 5 years.
I have read everything about these wrenches on this site. Still I can’t get a definitive answer as to why this doesn’t work.
This is what I sent Nu-Rex……..waiting for their reply:

Hello, I just purchased your timing wrench and am having a fairly big issue.
I have a 31 model A, it has the Nu -Rex upper plate with the modern Ford points.
When I set the wrench as instructed, I am no where near where the points are just starting to open. In fact the points are already fully open and riding right in the middle of the highest point on the cam.
If I set the timing the old way, with a test light etc, the car runs as it should but when I check it with the wrench it is at least 2 inches PAST the 4th point on the distributor head.
This baffles me, it’s just a simple notch in a cam with a fixed point matching to the wrench.
Some say it doesn’t work correctly using the modern points of non stock upper plate.
I find this hard to believe as the upper plate and points are also Nu-Rex!
Any advice or suggestions would be greatly appreciated.

Regards
 
Ran into that issue once- The modern points were mounted to the upper plate in the wrong position. Keep in mind, if you did adjust the points so the gap is just about to open, then the rotor tab won't be in the correct position to send the spark to the corresponding button in the cap thruout the spark adjustment travel.

The fix is to either replace the upper plate with a correct one, or rmount the modern points to the plate but in the correct position.
 
That’s a good point P.S…….I’ve layed awake at night wondering about that too. As I understand it the #1 distributor contact point should be right at the trailing edge of the rotor cap point (hope that makes sense). As it sits right now with the engine timed with the light method, the rotor is at the very start of its width.
Funny thing is the car starts and runs, (actually sounds great) although I haven’t driven it yet…..too much snow ��.
So how do you go about re positioning the points on the plate? Is there a thread or sticky on this? Perhaps a template somewhere?
 
I'm thinking that I watched a couple videos, there is a Paul Shinn video that shows how to time the ignition to the engine using the wrench. There is a Nu Rex video on the Nu Rex web site. A phone call to Nu Rex would probably work also.

I don't use the wrench, but I have one. I run the NuRex upper plate and their modern points and condenser. We drove the coupe a lot and the NuRex modern setup made the car very reliable as opposed to the stock setup. Your results may vary. LOL
 
Something I established with repeated testing about a year ago is that the Nu-Rex wrench and the Nu-Rex upper plate w/modern points don't actually go together well. If you use the wrench with the stock upper plate w/stock points, the timing accuracy is excellent – barely different from what you'd get using a light or ohmmeter. With the Nu-Rex upper plate w/modern points, the rotor position is visibly altered and does not match what you get when timing the Nu-Rex plate with a light/ohmmeter.

Attached pictures show results from timing the Nu-Rex plate with both the wrench and an ohmmeter. I agree with Paul that this demonstrates that the plate and points are assembled incorrectly – the points don't open until the rotor is almost past the terminal. His suggestion "to either replace the upper plate with a correct one, or mount the modern points to the plate but in the correct position" is good advice.
 

Attachments

  • image_55511.jpg
    image_55511.jpg
    47.1 KB · Views: 92
  • image_55516.jpg
    image_55516.jpg
    54 KB · Views: 86
Last edited:
Thanks for sharing your experience. I haven't heard of this problem before, but I don't use the modern points setup. No problems using the Nu-Rex tool with original upper plate and points - seems to work every time. I seem to have better success setting points more precisely with the stock points and they seem to last longer too.
 
I have one of the modified plates for modern points but I've never used it. I'm still using points from the mid 80s on a stock plate which adjust properly and work well. The blow proof capacitor works about as good as any condenser I've ever used. The car has always run well till a cap goes bad but I still carry a spare to remedy that. I don't like walking if I don't have to. It can easily be changed with the proper screw driver and some care in handling.

The modern condensers are spotty in quality of manufacture and the modern points are nothing to write home about either.
 
I agree with Rotorwrench. I also eliminated the inherent weakness of the stock points set up by replacing the old wire from the lower plate to the upper with the one sold by some of the suppliers which has more flexibility and is also about an inch longer. Problem solved.
 
Rob Doe said:
I'm thinking that I watched a couple videos, there is a Paul Shinn video that shows how to time the ignition to the engine using the wrench. There is a Nu Rex video on the Nu Rex web site. A phone call to Nu Rex would probably work also.

I don't use the wrench, but I have one. I run the NuRex upper plate and their modern points and condenser. We drove the coupe a lot and the NuRex modern setup made the car very reliable as opposed to the stock setup. Your results may vary. LOL
Click to expand...

There isn’t a video on YouTube that I haven’t watched on how to time a model A.
My goal last night was to find one that I hadn’t watched ……..couldn’t ☹️
I have subscribed to Paul Shinns channel for a long time.
 
Last edited:
So what position should the cap be in assuming it’s where it should be? Either using the newer upper plate or complete stock set up?
CCW rotation should the #1 point be at the leading or trailing edge of the cap……middle?
 
Am I the only one that finds it totally ironic….if not mildly amusing that the upper plate I’m using has “Nu-Rex” stamped right on it……….. but ya……sorry…that one doesn’t work with our wrench🙄
 
I guess I'm lost at what you're expecting the wrench to do. I along with one other, thought it was for merely for turning the point cam to set point opening with a meter or light. Instead of using the rotor. What makes the wrench handy is you can then hold the cam in position while you tighten the screw. Which you can't do using the rotor.
I time mine so the points just open with #1 piston at tdc and the advance lever down 2 notches. It doesn't matter where the rotor is to the cap #1 contact, as long as it's pointing at it somewhere. The rotor doesn't fire the coil at the proper time (piston position). The points do. The advance lever doesn't advance the rotor in relation to the cap. It advances the point plate in relation to the point cam. The faster the engine speed, the earlier the points open, firing the coil. The piston to rotor position never changes, and doesn't need to.
Later on vacuum advance moves the point plate, and mechanical advance (weights) move the rotor. At least that's how I was taught and understand it. Sorry for long winded.
 
wcmill said:
So what position should the cap be in assuming it’s where it should be? Either using the newer upper plate or complete stock set up?
CCW rotation should the #1 point be at the leading or trailing edge of the cap……middle?
Click to expand...

This is where it's supposed to be. The issue with the Nu-Rex plate w/modern points is that the points won't actually open (thus firing the plug) until the cam has rotated a few degrees farther, meaning that your initial timing will be ATDC.

A lot of people like to set their timing this way, so if you're that sort of person, go right ahead and use the Nu-Rex plate, modern points, and Nu-Rex wrench. If you're a stickler for accuracy, though, I would suggest modifying the setup.
 

Attachments

  • image_55511.jpg
    image_55511.jpg
    47.1 KB · Views: 37
So I just got off the phone with Bob from Nu-Rex. He phoned back 3 times and we talked for almost an hour in total. Very nice man, service like that these days is hard to find.
Anyways…..I have stumped him. He said he has never come across this particular issue since he’s owned the company.
We could talk all day long about this……my issue has nothing to do with engine mechanics or TDC. It’s very simple …..taking a tool with a defined notch in it and placing it on a rotor cam that has a receiving notch that is located exactly in the middle of the high point on the cam. When you place the handle in a certain position (#4 distributor point) with the triangle on the wrench handle, the points should NOT be fully open….mine are!
Alexiskai, mine are opening way to soon, not too late.
Bob is adamant that it’s not his plate…..especially since this is an actual Nu-Rex machined plate. He said there have been knock offs who have placed the mounting holes and the pivot point in the wrong spot. But according to him, that’s NEVER happened with his product.

So there you go gentleman……who can solve this riddle??? I’m willing to donate some of my
“Awake most of the night” time to anyone that is interested!🥺
 
Can you take a picture with the rotor off and post it? Similar to the pic attached here.
 

Attachments

  • image_55517.jpg
    image_55517.jpg
    55.5 KB · Views: 75
You must log in or register to reply here.
Back
Top