| I think anybody makes a replacement metal truck | | | | will not be strong enough and constant. Which |
| that just screws on and provides exact coupler | | | | allows too much gas to accumulate before it |
| height. I have replaced trucks but always had to | | | | ignites. Causing the "backfire" sound. Make sure |
| do some work on the car, either cutting the pin | | | | the gasket on the electrode plate is good when |
| off and re-drilling a hole and filling the existing hole | | | | re-installing the electrode. |
| with plastic spree or other filler's, then drilling and | | | | Double check that the combustion air intake are |
| tapping the hole. I would have to sometimes shim | | | | clear also. You will find it on the right hand side of |
| the truck with washers to raise the car too the | | | | the furnace. If the air intake is plugged or blocked |
| right height or on occasion cutting off some of | | | | the burn will not get enough air, which will cause |
| the trucks pin to lower the car to the right height. | | | | the same problem. |
| You could also consider replacing the wheels with | | | | The gas valve is a spring return and does not |
| metal wheels on the existing trucks. It lists all the | | | | draw current when off. Sounds to me like a |
| parts needed and the tools used. Some of the | | | | partial short in the wiring or the thermostat. It |
| companies make replacement wheels, which are | | | | might be hard to find. Start by disconnecting |
| excellent. | | | | wires at various points till the draw disappears. |
| I measured the wheels on my locomotive and the | | | | The steering speed sensor is usually located on |
| wheels are 12mm in diameter, which scales out at | | | | the steering rack. Certain GM model trucks and |
| 42". I suspect you need replacement wheels from | | | | vans have them on top of the column under the |
| Bachmann, rather than a substitute set from | | | | dash. It calculates vehicle speed for steering |
| another manufacturer, for two reasons. The axles | | | | reaction with a variable orifice with pulses from |
| are fairly thick and are held in place by two metal | | | | the steering wheel speed sensor. Most are |
| bars. Thinner axles would not be held in place and | | | | attached with either a screw or tabs molded into |
| might need bushing. | | | | the sensor. Usually they have 2 or 3 wires. You |
| The second reason is the axles are insulated in | | | | need only to disconnect the harness to remove |
| two places, rather than one, which is normal. I | | | | and replace. |
| suspect that these pilot wheels, pickup currents | | | | Well it is not a bad idea to let the furnace and AC |
| from rails, rather than one or none. The | | | | runs for a couple of hours to break it in. The |
| replacement wheels insulated only on one side | | | | smell that you get is many things; it might be |
| wouldn't provide the pickup; it might short out, | | | | glues and formaldehyde. It is used in many other |
| without modification of the truck. | | | | products so, run your furnace for a bit then run |
| The first thing I would check after the gas | | | | your ac to exchange the air in the unit and you |
| pressure would be the electrode. If the electrode | | | | will be just fine. |
| are deteriorated or gap too much, the spark plugs | | | | |