Go Back   Horizons Unlimited - The HUBB > 4 wheels > Other 4wd Overland Tech

Other 4wd Overland Tech Brand specific 4WD / 4 wheel, 2WD and Trucks
TECH discussions and info for NON-Land Rover or Toyota.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 26 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Tacho Problems

Hi Guys,

Im stumped on this one.

Mercedes 1617, Om366 engine, fitted with a Kenzie analogue tachograph. Took her out for a spin after alot of work we've done on her, and the tacho would not read anything.

It is a Kenzie unit. Has a 6 pin plug connection that goes into a port on the back. One of the plugs is a blank. 2 are earths, one is permanently live (keeps clock going when ignition is turned off I presume), one is live when headlights are on (lights up the unit), and the other is live when ignition comes on.

Both earths are good, and the other 3 are kicking out the correct 24v current. I had the tester on them.

If you disconnect then connect this plug, the clock starts working fine, the lights come on when headlights are turned on, and the red warning light comes on when you open the unit, or if you close it without a chart in there. So Im sure this plug is fine.

Then there is a 4 pin plug, the wiring of which runs to the sender on the gearbox.

1 of these is blank. One is an earth (good), and the other 2 are live.

This is the interesting part. With ignition on the 2 live wires of the 4 pin plug only kick out a 12v current.

However, the Kenzie unit states 24v, and the trucks elec system is 24v. So does the unit have an internal dropper on it? I've not heard of that before. I only thought they came as 12v or 24v?

So I presume I've got a voltage drop problem somewhere.

But if the 6 pin plug is all reading 24v, the current surely passes through the unit to the 4 pin plug, so is the voltage being lost within the unit itself?

Okay, waffling on.

I swapped the sender on the gearbox. That didn't work. I then swapped the Kenzie tacho unit for one from another merc truck (which I know is definitely working), and still nothing!

If I take the plug off the gearbox sender, I get the same 12v reading at this end of the wire as at the 4 pin plug end which is on the back of the tacho unit, so there is no probs with this wiring loom.

Totally stupmed. Any help much appreciated!!
Reply With Quote
  #2  
Old 26 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Sorry, forgot to mention, not only wont it print onto the charts, the speedo needle stays on zero alll the time, and kms wont go up on the dial at the bottom. This is the case with the unit I have, and also when i swapped it for a unit I know definitely works.
Reply With Quote
  #3  
Old 27 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: May 2006
Location: Bribie Island Australia
Posts: 580
I have a vague recollection that the earlier Kienzles needed keys to select driver mode. Maybe an issue with the locking of the face and/or selecting the driver position.
Reply With Quote
  #4  
Old 27 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Hi Roger,

This unit has a 2 small black nubbings at the top (like turney buttons, but I'll call them nubings!). One for each driver, which you can select 4 options (work, other work, rest, sleep, i think!)...

I'm sure the unit is locking itself properly, as when I close the unit and turn the key, the red warning light goes out. Also, the red light comes on if I have locked the unit without a chart in there and select the work option on the nubbings.

So im pretty sure it's locking itself closed properly. You're absolutely right, if it is not closed properly the speedo needle wont go up or the KM dial wont move. But as the red light goes out on my unit, Im sure it's locked properly.
Reply With Quote
  #5  
Old 27 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: May 2006
Location: Bribie Island Australia
Posts: 580
Next step sounds like troubleshooting the wiring loom from the sender to the tacho head. I am surprised that there is a reduction in voltage - but anything is possible.

Cant Lucas/Kienzle help with wiring diagrams? I'll have a look on my Merc parts DVD and see if they have anything in the digrams that might help - can you post your VIN?
Reply With Quote
  #6  
Old 27 Mar 2011
Registered Users
HUBB regular
 
Join Date: Nov 2009
Location: Lochmaben, Scotland
Posts: 67
This a must in uk

sorry to upset you, But had same problem on my DAF 95 XF. you need to remove the speed sensor and clean it as it will have metal fillings on the head. (I bet you can go at speeds in excess of 60mph).. You must then take it to a Tacho center to be recalibrated and resealed by law. If not you will be issued an instant prohibition by VOSA and an on the spot fine of many.

Oneworld Biker

RTW on a goldwing and prayer.

P.S You also need to clean the contact plate in the gearbox by removing the square-ish plate.

Last edited by oneworldbiker; 27 Mar 2011 at 23:30. Reason: forgot to add
Reply With Quote
  #7  
Old 27 Mar 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Roger, I will get the VIN tomorrow and pm it to you. Thanks for your help.

Oneworldbiker. When you say the speed sensor, do you mean the unit which bolts into the gearobx? I call that the sender, so just want to check we're talking about the same thing. Will follow advice on cleaning contact in gearbox. I will get the unit calibrated and sealed at a UK place for sure.

Thanks for all your help much appreciated.
Reply With Quote
  #8  
Old 3 Apr 2011
Registered Users
HUBB regular
 
Join Date: Nov 2009
Location: Lochmaben, Scotland
Posts: 67
Quote:
Originally Posted by Dave The Hat View Post
Roger, I will get the VIN tomorrow and pm it to you. Thanks for your help.

Oneworldbiker. When you say the speed sensor, do you mean the unit which bolts into the gearobx? I call that the sender, so just want to check we're talking about the same thing. Will follow advice on cleaning contact in gearbox. I will get the unit calibrated and sealed at a UK place for sure.

Thanks for all your help much appreciated.

Yes, we're talking about the same thing. The contact in the gearbox gets contaminated when using mineral oil. Also check the top of the gearbox housing for small holes from alloy corosion, as this allows water into the gearbox.. sorry about taking so long to get back to you as training new driver how to drive in the forests and to load timber.
Reply With Quote
  #9  
Old 4 Apr 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
No worries Oneworldbiker, sure appreciate the information. I will do this next week and see if it helps. Would like to do it now but currently busy laying ply wood flooring in the body.

Thanks again, Ill let you know if it works. Good luck driving in the forests!
Reply With Quote
  #10  
Old 4 Apr 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Roger, sory, i clean forgot to get the VIN. I'll get it tomorrow
Reply With Quote
  #11  
Old 13 Oct 2011
Registered Users
Veteran HUBBer
 
Join Date: Dec 2009
Location: London
Posts: 515
Completely forgot this thread.

Finally managed to get the tacho working again. I'm not sure which of the following I did that solved the problem but she is operational again:

1. Found that the electrical connections in the plastic screw on cap that go onto the sender were pushed too far into the plastic casing. So when I screwed the cap onto the sender, one of the metal connections wasnt mating properly. Pulled the connecter in question forward a little and crimped it tighter within the casing.

2. Roughed up the end of the sender that screws into the gearbox with sandpaper

3. Found a wire that had been rubbing against a chassis cross member....possibly this was contributing to the 24v vs 12v power problem i talked about earlier.......one of the three wires in the odometer cable was down to about 3 strands of wire so I did a chop and chock job.

One of those 3 problems solved it. Happy days!
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted R80G/S Speedo Tacho Bash Plate Dual Seat XTrovert TRAVEL Equipment for Sale / Wanted 2 29 Oct 2009 14:33
3AJ engine and tacho issues... Babybadger Yamaha Tech 11 2 Aug 2009 15:23
tacho drive gear xtz.. Chrisvas Yamaha Tech 4 21 Apr 2009 07:11
Tacho Schnaps Yamaha Tech 3 14 Jan 2002 18:09
Tacho and Speedo Greg Yamaha Tech 6 28 Nov 2001 18:19

 
 
 

NEW! HU 2015 Motorcycle Adventure Travel Calendar is now available! Get your copy now for some terrific travel inspiration!

HUGE, 11.5 x 16.5 inches, beautifully printed in Germany on top quality stock! Photos are the winning images from over 600 entries in the 9th Annual HU Photo Contest!

Horizons Unlimited 2015 Motorcycle Adventure Travel Calendar.

"The calendar is magnificent!"

"I just wanted to say how much I'm loving the new, larger calendar!"

We share the profit with the winning photographers. YOU could be in the HU Calendar too - enter here!


HU DVD Autumn Special!

Take 40% off Road Heroes Part 1 until October 31 only!

Road Heroes features tales of adventure, joy and sheer terror by veteran travellers Peter and Kay Forwood (193 countries two-up on a Harley); Dr. Greg Frazier (5 times RTW); Tiffany Coates (RTW solo female); and Rene Cormier (University of Gravel Roads).

The first in an exciting new series, Road Heroes features tales of adventure, joy and sheer terror by veteran travellers."Inspiring and hilarious!"

"I loved watching this DVD!"

"Lots of amazing stories and even more amazing photographs, it's great fun and very inspirational."

"Wonderful entertainment!"

Check it out at the HU Store! Remember to use Coupon Code 'HEROES' on your order when you checkout.



Scottoiler automatic chain oilers. The most important accessory for your next motorcycle adventure!


Renedian Adventures


Renedian Adventures

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 04:47.