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07-11-2017, 09:40 AM
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#1
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
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Posts: 979
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Autometer 5" Diesel Tach Issues
I have an Autometer 5" diesel tach and pick up sensor on my 12 valve fluidampr balancer. The tach does not read well at all, jumps around, nothing even worth looking at. I notice the instructions show a 4 notch balancer and mine is a 2 noth. What has everyone been doing to combat this issue?
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-11-2017, 10:06 AM
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#2
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Name: PVXCummins
Title: Here to Learn
Status: Not Here
Join Date: Sep 2009
Location: North Carolina
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Posts: 175
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2 things I did to combat any issue of the tach jumping.
First, I took a dremel to my Fluidampr and made 2 additional notches on the same side i had the tach pickup located. I didn't make grooves all the way across the surface of the damper, just 1" x 1" notchs IIRC.
2nd, I stuck the tach wires in a drill and twisted them together. Didn't go to crazy, just enough to get them together. I then wrapped the wires in HVAC tape from the tach pickup all the way to the back of the tach. Then wrapped that in electrical tape. The Aluminum HVAC will help dissipate the engine harmonics that cause the tach to jump in the higher RPMs.
Did that 2+ years ago and have a dozen or so hooks on the truck and havent had any issues with the tach jumping. Its as smooth as factory. Only issue to note would be the tach bouncing once i hit about 5,500 RPM right before i ride the clutch out.
__________________
98 RCLB 3500 12V 2.5 Pulling Truck
04 F250 6.Blow Tow Rig
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07-11-2017, 10:22 AM
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#3
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,396
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I never was able to get mine working correctly with 2 notches. I welded 4 small bolt nuts to the balancer and has been working smooth and perfect. I just tacked the nuts on thru the open middle.
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07-11-2017, 12:33 PM
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#4
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
Member`s Gallery
Posts: 979
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Quote:
Originally Posted by PVXCummins
2 things I did to combat any issue of the tach jumping.
First, I took a dremel to my Fluidampr and made 2 additional notches on the same side i had the tach pickup located. I didn't make grooves all the way across the surface of the damper, just 1" x 1" notchs IIRC.
2nd, I stuck the tach wires in a drill and twisted them together. Didn't go to crazy, just enough to get them together. I then wrapped the wires in HVAC tape from the tach pickup all the way to the back of the tach. Then wrapped that in electrical tape. The Aluminum HVAC will help dissipate the engine harmonics that cause the tach to jump in the higher RPMs.
Did that 2+ years ago and have a dozen or so hooks on the truck and havent had any issues with the tach jumping. Its as smooth as factory. Only issue to note would be the tach bouncing once i hit about 5,500 RPM right before i ride the clutch out.
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how deep did you go with the dremel? any pictures of this? I appreciate the info!
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-11-2017, 02:18 PM
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#5
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Name: PVXCummins
Title: Here to Learn
Status: Not Here
Join Date: Sep 2009
Location: North Carolina
Member`s Gallery
Posts: 175
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No pictures unfortunately. I'm out of state a for a month so its not like i can run out and snap some lol.
I want to say the notches were 1/8" - 1/4" deep.
I should probably specifiy as well, i made the notches as evenly spaced as possible between the existing slots in the Fluidampr. Basically take a circle and place 4 points evenly spaced around the circumference.
__________________
98 RCLB 3500 12V 2.5 Pulling Truck
04 F250 6.Blow Tow Rig
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07-11-2017, 02:43 PM
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#6
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
Member`s Gallery
Posts: 979
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Quote:
Originally Posted by PVXCummins
No pictures unfortunately. I'm out of state a for a month so its not like i can run out and snap some lol.
I want to say the notches were 1/8" - 1/4" deep.
I should probably specifiy as well, i made the notches as evenly spaced as possible between the existing slots in the Fluidampr. Basically take a circle and place 4 points evenly spaced around the circumference.
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gotcha, i will try it!
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-11-2017, 04:26 PM
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#7
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Name: T-MAN
Title: misunderstood
Status: Not Here
Join Date: Sep 2008
Member`s Gallery
Posts: 352
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IMG_3789[1].jpg
IMG_3790[1].jpg
The autometer diesel tach needs 4 notches ( or pickups) equally spaced to work. my fluidampr had 2 1/2" wide 3/16 deep notches i added 2. I welded a piece of pipe to there relocation bracket and good to go. I think its bull**** for what that tach costs they don't sell any kind of install kit....
__________________
2001.5 ppump allison 11.399@ 117.90 6850#
1997 rcsb 12v 6.7 9.38 @ 146.54
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07-11-2017, 05:49 PM
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#8
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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I had issue like this and changed my pickup Lactions 3 times no fix .. it's was a bad pickup sensor sent the complete tach in with pickup and got tested . And they sent a new pickup no charge .. I put several on that would pickup off notches no issues ..
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07-12-2017, 06:31 AM
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#9
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
Member`s Gallery
Posts: 979
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Quote:
Originally Posted by T-MAN
Attachment 67311
Attachment 67312
The autometer diesel tach needs 4 notches ( or pickups) equally spaced to work. my fluidampr had 2 1/2" wide 3/16 deep notches i added 2. I welded a piece of pipe to there relocation bracket and good to go. I think its bull**** for what that tach costs they don't sell any kind of install kit....
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Did you take the balancer to a machine shop to add the other 2 notches?
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-12-2017, 06:40 PM
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#10
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Name: T-MAN
Title: misunderstood
Status: Not Here
Join Date: Sep 2008
Member`s Gallery
Posts: 352
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I put it on a mill. not sure how exact it needs to but i had access to a mill.
__________________
2001.5 ppump allison 11.399@ 117.90 6850#
1997 rcsb 12v 6.7 9.38 @ 146.54
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07-12-2017, 10:05 PM
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#11
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Name: BluegrassDiesel
Title: UK2K!
Status: Not Here
Join Date: Apr 2007
Location: KENTUCKY
Member`s Gallery
Posts: 4,136
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Why not just make a bracket to pick up off the head of the damper bolts?
Even though you only have 2 notches, it still shouldn't be jumping around. It would just be reading 1/2 speed of actual RPM. When they jump around usually the gap is too big. IIRC the gap is supposed to be .030-.050". An old credit card works great for setting the gap as they are usually just a hair over .030". Just make sure your bracket is very secure and won't be affected by vibrations at high RPM.
__________________
Josh Land
Bluegrass Diesel Performance
Lancaster, Ky
SHOP ONLINE @ http://WWW.SHOPBLUEGRASS.COM
97 DodgePPL Limited Pro Stock "The Crippler"
09 3500 GMC CCDually
05 Silverado SS
Last edited by BluegrassDiesel; 07-12-2017 at 10:09 PM.
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07-13-2017, 04:36 AM
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#12
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Name: T-MAN
Title: misunderstood
Status: Not Here
Join Date: Sep 2008
Member`s Gallery
Posts: 352
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Bluegrassdiesel, Do you have a picture of the bracket to pickup the balancer bolts? I was going to do my that way but couldn't figure out a secure way so it wouldn't vibrate and dance around. Thanks
__________________
2001.5 ppump allison 11.399@ 117.90 6850#
1997 rcsb 12v 6.7 9.38 @ 146.54
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07-13-2017, 05:17 AM
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#13
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
Member`s Gallery
Posts: 979
|
Quote:
Originally Posted by BluegrassDiesel
Why not just make a bracket to pick up off the head of the damper bolts?
Even though you only have 2 notches, it still shouldn't be jumping around. It would just be reading 1/2 speed of actual RPM. When they jump around usually the gap is too big. IIRC the gap is supposed to be .030-.050". An old credit card works great for setting the gap as they are usually just a hair over .030". Just make sure your bracket is very secure and won't be affected by vibrations at high RPM.
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I set it at .040 with a feeler gauge. I may just make that bracket like you said.
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-18-2017, 10:33 AM
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#14
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Name: Cummins12Club
Title: Happy Dinosaur
Status: Not Here
Join Date: Jan 2013
Location: Too Far From the Action
Member`s Gallery
Posts: 979
|
Quote:
Originally Posted by PVXCummins
2 things I did to combat any issue of the tach jumping.
First, I took a dremel to my Fluidampr and made 2 additional notches on the same side i had the tach pickup located. I didn't make grooves all the way across the surface of the damper, just 1" x 1" notchs IIRC.
2nd, I stuck the tach wires in a drill and twisted them together. Didn't go to crazy, just enough to get them together. I then wrapped the wires in HVAC tape from the tach pickup all the way to the back of the tach. Then wrapped that in electrical tape. The Aluminum HVAC will help dissipate the engine harmonics that cause the tach to jump in the higher RPMs.
Did that 2+ years ago and have a dozen or so hooks on the truck and havent had any issues with the tach jumping. Its as smooth as factory. Only issue to note would be the tach bouncing once i hit about 5,500 RPM right before i ride the clutch out.
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I took your advice. So far it has worked perfectly up to 3000rpm, just havent taken it any higher yet.
__________________
93 Dodge, going racing. Special Thanks to Tim Wright & Pro Street Diesel
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07-18-2017, 11:24 AM
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#15
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Name: YoungDiesel27
Title: Never Enough Time
Status: Not Here
Join Date: Jul 2010
Location: West Virginia
Member`s Gallery
Posts: 825
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Quote:
Originally Posted by BluegrassDiesel
Why not just make a bracket to pick up off the head of the damper bolts?
Even though you only have 2 notches, it still shouldn't be jumping around. It would just be reading 1/2 speed of actual RPM. When they jump around usually the gap is too big. IIRC the gap is supposed to be .030-.050". An old credit card works great for setting the gap as they are usually just a hair over .030". Just make sure your bracket is very secure and won't be affected by vibrations at high RPM.
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I have the same setup on mine and it has worked great for years.
__________________
EFI Live, HP Tuners, Smarty custom tuning
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07-18-2017, 12:51 PM
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#16
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Name: PVXCummins
Title: Here to Learn
Status: Not Here
Join Date: Sep 2009
Location: North Carolina
Member`s Gallery
Posts: 175
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Quote:
Originally Posted by Cummins12Club
I took your advice. So far it has worked perfectly up to 3000rpm, just havent taken it any higher yet.
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Awesome!! Glad to hear it worked. Happy to help
__________________
98 RCLB 3500 12V 2.5 Pulling Truck
04 F250 6.Blow Tow Rig
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