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veeracer
Active Member
USA
21 Posts |
 Posted - 04/09/2007 : 08:12:27 AM
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| The speedometer and odometer have stopped working in my 91 international.All other instruments still work. I have located the sending unit mounted on the retarder on the mt643.It is some sort of a round electronic sender with two wires coming out.I suspect the sender is the problem, but don't have any info on a specific test to verify.The Intl. dealer quoted me $300+ for a replacement so a swap test is out of the question. If it is the sender I may try to repair it. Thanks Mark |
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veeracer
Active Member
USA
21 Posts |
Posted - 04/09/2007 : 12:18:18 PM
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| If anyone knows how to test the sender or suspects it might be something else please let me know. |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 04/09/2007 : 12:30:53 PM
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Well...I hate to tell you this, but every one of my 1990-1992 Internationals that lost thier tach and/or speedo had to have new instrument clusters. $$$$ Those black faced clusters used early in the 3800 production were absolute junk and newer ones aren't much better.
Hopefully someone on here can give you a diagnostic method to be sure. In my case the boss just proclaimed we were replacing "those junk bastards" whenever it happened, so I never really got into this issue. Check out this old posting though, it was for lighting issues but might be worth a try... http://www.schoolbusfleet.com/forum/topic.asp?TOPIC_ID=3767
Good luck to you.
OH...and should you have to buy a cluster, don't use the old one to relieve stress with a hammer...there is a core charge from International on those useless things that they don't even repair. |
Edited by - Thomasbus24 on 04/09/2007 12:33:36 PM |
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BusBoy 1
Advanced Member
USA
212 Posts |
Posted - 04/09/2007 : 12:55:13 PM
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| The last one I had problems with I did what most of the guys in the other post said was stupid and soldered all the pin connections on the back of the board. It took a long time and patience but only cost my time That has been almost 2 yrs ago and about 30000 miles and the lights and gauges have not even flickered So was it a stupid idea??? |
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Thomasbus24
Administrator
USA
4547 Posts |
Posted - 04/09/2007 : 12:59:29 PM
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| Nothing stupid about. Of the 9 buses I talked about in that old post, 7 of them are still in service, 3 still have their original clusters thanks to the advice. (the rest we finally gave up on) |
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veeracer
Active Member
USA
21 Posts |
Posted - 04/09/2007 : 1:10:25 PM
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| I did the lighting fix by soldering the pins a couple years ago. The lights are still working fine. Sounds like it may be time to solder the speedo now. |
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contactbluebird
Senior Member
USA
81 Posts |
Posted - 04/10/2007 : 04:30:47 AM
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| If you have to buy a new cluster, do not buy from international. I replaced 12 clusters last fall. I bought them from D&D Insturments. They done me right...shipped the new cluster to me and also sent a retuen label and paid shipping back for the core. Good bunch to deal with! http://www.ddinstruments.com 1-800-766-4243 |
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bluebirdvision
Top Member
USA
1081 Posts |
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Bassman
Top Member
USA
558 Posts |
Posted - 04/11/2007 : 03:21:52 AM
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| I second the motion to use D&D. They have been great and the cost savings is excellent. Pull the dash cluster out (easy) and get the IH part number off the little sticker on top before you call. |
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IBTMech
Top Member
USA
973 Posts |
Posted - 04/11/2007 : 7:23:23 PM
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| I have soldered the cracked pins on several units. With a good jeweler's eye loupe, the cracks are easy to spot. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
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jeepcjron
Advanced Member
USA
262 Posts |
Posted - 04/12/2007 : 6:20:46 PM
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quote:
Originally posted by IBTMech
I have soldered the cracked pins on several units. With a good jeweler's eye loupe, the cracks are easy to spot.
col klink is that you? thanks for the image Eric still laughing. good idea though.
ya these are pricey so if you can do the repair try it. can also try a known good dash and see if it corrects the issue if you have doubts |
its like a slinky! useless but fun to watch. |
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ModMech
Top Member
USA
948 Posts |
Posted - 04/13/2007 : 7:55:05 PM
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If you lost ONLY the speedo and odo, the wiring for the VSS is the most likely cause. It is relatively common for the wire insulation to break RIGHT at the sender. If (when) the wires touch or get dirty and wet the signal shorts out, and the speedo/odo quit.
The VSS is on a pig-tail, so you can pull the D/S and spin the output with the engine running and check for an A/C voltage between the two wires from the VSS. No signal = bad sensor or wires. |
If you want customer service, you NEED an International! |
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tigger2
Advanced Member
USA
470 Posts |
Posted - 04/17/2007 : 10:38:16 AM
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| Solder not only the wire terminal but aldo look for the twisted pair and solder that one as well, be sure to clean the fingernail polish off of the sooder points first. the speedo pig tail should have 1200 to 1400 ohms resistance across them, this should tell if sensor is bad. |
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veeracer
Active Member
USA
21 Posts |
Posted - 04/18/2007 : 8:25:03 PM
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I looked over the wires going into the sender and they look good . No cracks in the insulation. I did some checking with a multimeter and found the following: resistance between the two wires going into the sender=200 ohms. resistance between the wires going to the speedo = 420k ohms.
I also ran jumper wires from the sender into the bus and drove it while I checked for voltage. none detected.based on modmech's post I guess this would confirm a bad sender.I don't think they are designed to be serviceable,but at $300+ for a new one I may try to crack it open and have a look see. |
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Topic |
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speedo malfunction
