| Author | Message | ||
| Derek (Derek_l)
Rating: N/A |
The following instructions were found pasted in the engine compartment of a H3-45 with a S60 and B500R. Don't ask me what language it's written in (vehicules?). http://24.83.196.239/welding.jpg Should anyone want a higher res original I will email it to you. | ||
| Johnny Rating: N/A |
Why does it look like it was used as a BB gun target? | ||
| Derek (Derek_l)
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It is mounted on perforated steel. I assume rock chips or high pressure water or mechanics and drivers leaning where they shouldn't have caused the holes. This was one of the better ones I saw. There are some where you can't even make out any writing. | ||
| BrianMCI Rating: N/A |
Here, I understand Engineerese/Mechanish, basically it says This is the procedures to follow if you are going to weld on a vehicle that has either an Electronic shift Transmission or has a DDEC unit(Detroit Diesel Engine Controls) Disconnect the positive and negative cables from your battery(s) Unplug any ECM (electronic control module)(for the transmission) or ECU (engine control unit) that is attached to your vehicle. Cover any of these units and the wiring for them if you are going to be welding anywhere near them. Don't use any electronic box to attach a ground cable for your welding Don't weld on any electronic box Pretty simple really... If you know the "Lingo" Brian | ||
| BrianMCI Rating: N/A |
And I'll just bet the holes were poked in that message by a bored or frustrated mechanic with an awl or a pick (sort of an ice pick looking tool) or a pocket screw-driver. Brian | ||
| TWODOGS (Twodogs)
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yep...kinda like them bubble wrap things | ||
| Sojourner (Jjimage)
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Thanks Derek, Before, I offen wonder if it any more then being said. Now I know what DD said. Thanks to you Derek. Sojourn for Christ, Jerry PS...save it in my picture file. | ||
| Sojourner (Jjimage)
Rating: N/A |
In print form, from Derek's photo; WARNING WELDING PROCEDURES FOR ELECTRONIC TRANSM. AND/OR DDEC EQUIPPED VEHICULES WHEN FRAME OR OTHER WELDING IS REQUIRED ON VEHICULES. THE FOLLOWING PRECAUTIONS ARE TO BE TAKEN TO PROTECT THE ELECTRONIC TRANSM. AND/OR DDEC COMPONENTS: 1 DISCONNECT POSTIVE AND NEGATIVE WIRING CONNECTIONS AT THE BATTERY. 2 ALWAYS DICONNECT BOTH ECU AND E.C.M. CONNECTORS PRIOR TO ANY WELDING ON THE VEHICULES. 3 COVER ELECTRONIC TRANSM. AND/OR DDEC COMPONENTS AND WIRING TO PROTECT FROM HOT SPARKS, ETC. 4 DO NOT CONNECT WELDING CABLES TO ELECTRONIC TRANSM. AND/OR DDEC COMPONENT. 5 DO NOT WELD ON ELECTRONIC TRANSM. AND/OR DDEC COMPONENT. P.S………I assume the word “Transm” mean transmission??? For what it’s worth. Sojourn for Christ, Jerry | ||
| Jim Stewart (H3jim)
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I haved an H3-41 and Prevost mechanics also disconnect the ABS braking brains too. They only shut off the power relay, and do not pysically disconnect any cables (other than the aforementioned ECU, tranny brain and brake brain) | ||
| Bob Oakman (Bobsbus)
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Maybe the holes are from welding sparks.  Being careful is always a good thing. My bus had perfectly good windshields until I pummeled them with sparks from a grinder and from welding. The slag embedded itself right in the glass and I had to buy new ones. I'm wondering if "Electric Power Transm" isn't referring to a powered suspension adjustment or engine mount of some kind... Like the "transm" that holds an outboard motor on a boat. Either way, you don't want the high amperage of a welding machine accidentally arching across the surfaces of a bushing or bearings if they are placed in the path of least resistance, between ground and rod. | ||
| Gary McFarland (Gearheadgary)
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"....until I pummeled them with sparks from a grinder and from welding...." Like an idiot, I did this to my brand new Velvac Mirrors ($300) I believe Transm is Transmission, and they are electronically controlled. "surfaces of a bushing or bearings" I mentioned this once before, but that's why you don't hang your ground clamp from a lugnut. gary | ||
| BrianMCI Rating: N/A |
Okay, so did I translate that whole thing for you all and nobody read it? Yes TRANSM means transmission, ECU means engine control unit (obviously for the engine) ECM means electronic control module (for the tranny) and DDEC is Detroit Diesel engine controls (the ecu) And the word vehicule means poor proof reading Brian | ||
| Bob Oakman (Bobsbus)
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Ok... I always snapped the ground onto the main frame or structure somewhere, but always wondered, since all the electronic gadgets share a common ground, weather I could do any damage. My limited knowledge in electronics tells me no, but I have been burned by my logic many times. ...been burned by falling slag a lot to. It always stops at the elastic waist band of your underwear and melts through layers of skin while you claw desperately at your coveralls trying to get to it. | ||
| Stan Rating: N/A |
Bobsbus: It is critical to keep the ground clamp close to the point of welding. All electronic devices are subject to damage from welding anywhere on the structure but keeping the ground and hot close together reduces the risk. The only 100% safe way is to disconnect all electronic components. | ||
| BrianMCI Rating: N/A |
I agree with Stan, chances are you aren't going to fry onboard electronics if you keep the ground close to your work. But strange things can happen, and just the smallest amount of current in the wrong place can kill an ECM or an ECU, so why take that chance? Brian |