Brilliant video,I’ve been in the trade over 30yrs and would never have suspected that drive pinion to be the cause because I’ve never seen this happen...great find and Thanks for the education 👍
Very Helpful video. I always wonder how the PICO NVH works until I found your channel. Looking forward to see more videos, keep em coming! You sir earned a subscriber
Good review. Unbalance is caused by centrifugal force on the eccentric Mass. Centrifugal force is proportional to the square of the rotational speed. Thus it would be good to have drive shaft vibration plotted With the drive shaft speed. An increasing vibration with increasing speed would confirm that it was unbalance (in This case caused by the eccentricity of the pinion shaft). Not If you would like to risk your nice equipment but you could actually attach the accelerometer to the differential case to have an even more convincing evidence
busjockey1 all the system needs is generic OBD for ROM & MPH. If you can’t pull those in all you need to do is record and then note the RPM & MPH where the vibration occurred and add that to the highlighted section for clear demarcation.
I recently got this exact setup. Your video has been very helpful in setting up and understanding its use. BUT having watched this several times over several weeks I still haven't figured out what led you to the pinion. Did the tool convince you that the problem was in the driveshaft, not engine or tires? Then having confirmed the shaft itself was good you moved to what the shaft was attached to? If so did you start at the rear axle or the transmission? Either one being bent could cause the vibration. Not being critical, just trying to understand how you got to the bent pinion. Very useful video.
The driveshaft was confirmed good and the tool helped to identify that the vibration was in the order of driveshaft rotation. We then looked closer at both ends and ended up putting a dial indicator on the companion flange. This let us know that we were getting closer to the root of the problem.
I'm curious now what would happen if you could adapt an on the car brake lathe to the companion flange as to isolate the propeller shafts from the pinion.if this would be helpful at all?also I was unaware that the pico nvh could only be used with the four Channel .I guess I'll have to trade my two channel for a 4-channel now. Thank you ,very good pico video.
Great video and I can see how this tool could re-affirm a suspicion during diagnosis. Did you indicate the pinion flange before it was removed from the vehicle?
Hi Patrick, at the time of analysis, a bent pinion shaft wasn’t even in the cards (for me anyway) since I’ve never seen that happen and how could it? Well of course in hindsight, anything should be considered possible. I was working with the driveline company and did indicate the driveshaft approximately 1’ forward of the pinion and the results obvious. I then indicated the flange and condemned it. The problem was finding a replacement part. This job ended up being an insurance job so we ended up with a used diff that we took apart and replaced all the bearings and seals. Like I said in the video this was the first time using the tool and I learned a lot.
Hindsight is 20:20 for sure. My guess is the customer understated how spectacular the event was! I know mine lie to me all the time lol. When you think about it, often the lengths that mechanics have to go to in fault finding are ridiculous! And the better you are, the more difficult jobs get referred to you, its nuts!
Great video, How can or would you determine if its the front axle or rear axle, I know on the s10 the front axle aint rotating so that's pretty obvious but a awd vehicle both axles would be turning, and if you are going after a tire imbalance can you determine what tire is out of balance? or does it just give you a direction and your on your own to figure out what exactly is the problem? I really like this tool but it seems very complicated. Thanks
JOHN HUFNAGEL once you know what to focus on you can then relocate the sensor and retest to see the delta in the signal. The same practice applies when you have something happening at wheel speed. Move the sensor around to each corner of the vehicle and retest.
Any Bluetooth enabled OBDII adapter will work. Here’s the unit used in the video: BAFX Products Bluetooth Diagnostic OBDII Reader/Scanner for Android Devices www.amazon.com/dp/B005NLQAHS/ref=cm_sw_r_cp_tai_JhFUBbRYWQWP0
Excelllent content as always Scott. You broke the tool operation down and gave us an excellent case utilizing its power.
Thank you for sharing.
Glad it was helpful!
Brilliant video,I’ve been in the trade over 30yrs and would never have suspected that drive pinion to be the cause because I’ve never seen this happen...great find and Thanks for the education 👍
Thanks Steve
SUBSTANTIAL SCOTT BROWN
Thank you for sharing it 👍
From Nick Ayivor from London England UK 🇬🇧
Very Helpful video. I always wonder how the PICO NVH works until I found your channel. Looking forward to see more videos, keep em coming! You sir earned a subscriber
Hi thanks for shearing very intersting case study & you explained the issues well......Looking forward to more case studies
This is a great video! I wonder if this would work WELL for isolating brake judder from front to back and/or both.
Good review. Unbalance is caused by centrifugal force on the eccentric Mass. Centrifugal force is proportional to the square of the rotational speed. Thus it would be good to have drive shaft vibration plotted With the drive shaft speed. An increasing vibration with increasing speed would confirm that it was unbalance (in This case caused by the eccentricity of the pinion shaft). Not If you would like to risk your nice equipment but you could actually attach the accelerometer to the differential case to have an even more convincing evidence
Thank you Scott.
What a great video! It would be good to understand everything ... unfortunately I do not understand English very much
Nice job. I wonder if it would interface with the new 6.7 Cummins on a 2017 Transit Bus. Will have to look into that.🙂
busjockey1 all the system needs is generic OBD for ROM & MPH. If you can’t pull those in all you need to do is record and then note the RPM & MPH where the vibration occurred and add that to the highlighted section for clear demarcation.
I recently got this exact setup. Your video has been very helpful in setting up and understanding its use. BUT having watched this several times over several weeks I still haven't figured out what led you to the pinion. Did the tool convince you that the problem was in the driveshaft, not engine or tires? Then having confirmed the shaft itself was good you moved to what the shaft was attached to? If so did you start at the rear axle or the transmission? Either one being bent could cause the vibration. Not being critical, just trying to understand how you got to the bent pinion. Very useful video.
The driveshaft was confirmed good and the tool helped to identify that the vibration was in the order of driveshaft rotation. We then looked closer at both ends and ended up putting a dial indicator on the companion flange. This let us know that we were getting closer to the root of the problem.
@@TechScottBrown That is what I thought. Thanks
good demo...loved it...educative
Can this work on rotating equipment such as pumps and motors. Very interesting video.
I'm curious now what would happen if you could adapt an on the car brake lathe to the companion flange as to isolate the propeller shafts from the pinion.if this would be helpful at all?also I was unaware that the pico nvh could only be used with the four Channel .I guess I'll have to trade my two channel for a 4-channel now. Thank you ,very good pico video.
Daniel Wells I don’t think the brake lathe would help since the bent pinion caused both a radial an lateral issue.
Scott Brown yeah . Also Driveline issues are only prevalent under load anyway.
Great video and I can see how this tool could re-affirm a suspicion during diagnosis. Did you indicate the pinion flange before it was removed from the vehicle?
Hi Patrick, at the time of analysis, a bent pinion shaft wasn’t even in the cards (for me anyway) since I’ve never seen that happen and how could it? Well of course in hindsight, anything should be considered possible. I was working with the driveline company and did indicate the driveshaft approximately 1’ forward of the pinion and the results obvious. I then indicated the flange and condemned it. The problem was finding a replacement part. This job ended up being an insurance job so we ended up with a used diff that we took apart and replaced all the bearings and seals. Like I said in the video this was the first time using the tool and I learned a lot.
Hindsight is 20:20 for sure. My guess is the customer understated how spectacular the event was! I know mine lie to me all the time lol. When you think about it, often the lengths that mechanics have to go to in fault finding are ridiculous! And the better you are, the more difficult jobs get referred to you, its nuts!
Great video, How can or would you determine if its the front axle or rear axle, I know on the s10 the front axle aint rotating so that's pretty obvious but a awd vehicle both axles would be turning, and if you are going after a tire imbalance can you determine what tire is out of balance? or does it just give you a direction and your on your own to figure out what exactly is the problem? I really like this tool but it seems very complicated. Thanks
JOHN HUFNAGEL once you know what to focus on you can then relocate the sensor and retest to see the delta in the signal. The same practice applies when you have something happening at wheel speed. Move the sensor around to each corner of the vehicle and retest.
How many accelerometer sensors ("magnetic things") did you use?
One 3-axis accelerometer shown in the video
Awesome from aus
Can you send me the link to buy the same model of OBD 2 connector that you have?
Any Bluetooth enabled OBDII adapter will work. Here’s the unit used in the video: BAFX Products Bluetooth Diagnostic OBDII Reader/Scanner for Android Devices www.amazon.com/dp/B005NLQAHS/ref=cm_sw_r_cp_tai_JhFUBbRYWQWP0
ANY J2534 reprogrammer will work. I use my Ease Reprogrammer II because the ELM 237 doesnt have a stable driver for Win10
Isnt x left and right
Y front /back
Z up and down
Pico maps it a certain way out of the box, however, the end user has the ability to remap as they see fit.