What is the correct procedure for timing the 7.3 using the pulse adaptor? Does the adaptor work with a standard induction timing light or does it require a special kind of light?

 

This web page gives you some info..........

http://www.oliverdiesel.com/tech/timing.htm

 

Thanks Peter, I had visited the Oliver web site but hadn't found the information I was looking for. The questions will show how little I know but the books don't help. I think the older Hayes Diesel Manuals may have had the information but the newer book doesn't I haven't been able to find the information in print or find specific information on the internet. I'm planning to give the local library a visit and will probably find at least some of the answers but untill I can get there here are some of the questions.

1. I've located the index mark on the timing plate and the groove in the harmonic balancer. Are they 0* TDC when aligned @ 2000 rpm?

2. The harmonic balance is 22 5/16" dia. which equals 357 sixteenths inch. Is it correct that 1/16" movement of the mark on the harmonic balancer scale will equal almost 1 degree of timing adjustment?

3. Does it matter if the pulse adaptor is place closer to the IP or closer to the injector? I found conflicting information here.

4. finally I've read about 9 1/2 and 20 phase settings but don't understand what they are talking about. One forum thread listed it as a 9 1/2 setting, another listed it as 20 setting and some threads haven't mentioned it at all. Will a no frills induction timing light give a true reading when it's hooked to the pulse adaptor or does it require a special timing light with some means of adjusting for these phase settings?

 

Here's the answers I found. They make it appear the problem is really much more simple than I had first thought. I had envisioned a delay between the actual time of injection into the cylinder and time of the pulse measured by the pulse adaptor but it appears the reaction time of the electronic response is measured in milliseconds.

Please correct me if I'm posting misleading or wrong information.

Thanks! td

1. The timing mark is for 0* TDC
2. Each degree advanced or retarded will show up as about 1/16" movement of the groove in the harmonic balancer as measured against the mark on the timing plate.
3. the original connection for hooking up the proprietary pulse adaptor is located on the injector. Attach the pulse adaptor as close to the injector as possible.
4. The adjustable timing lights allow you to switch the advance or retard settings so that the TDC mark reads the dialed up advance or retard setting. A straight up induction timing light will work if the timing plate is calibrated in degrees.

 

i'm not smart but here it goes ...
i used the tach-time tool to set the timing on my trucks. from what i can gather, the timing light will be triggered by the pulse of the injection of fuel to the number one cylinder on the pickup trucks and the number 3 on the e style vans. ( dont ask, cuz i dont know why) the timing mark will show up as the probe picks up the slot on the harmonic balancer and the timing is displayed on the tach-time tool screen until the engine vibration makes it fall off the fender and onto the ground or into the fan. the tach-time tool is pre set for each use at 20* for the 7.3 and 6.9 engines. the chevy is a different setting and those settings are in the manual. there's my nickel, hope it helps.

 

PLC7.3 & Bilder12, The information this morning from both of you just turned the light on. The answer had been staring me in the face and I just couldn't see it. The difference is the use of a timing meter with a probe vs the use of an induction timing light. The insertion hole for the meter probe is offset from the timing mark so the meter has to be set to 20* to compensate for the offset and adjust the timing to spec. The use of an induction timing light requires using only the spec timing advance as it's reading the TDC mark.

The use of a different injector for timing on the vans was designed to accomodate access. Working on a motor just isn't the same when it's in a van.

td