Air Loss Left Front???

[Les Brandt]

It seems as though I have an air leak in the left front. Not sure what the cause is. The driver side is level when driving but after a bit, it seems low when looking at it. Also, when I'm driving, it seems like I here something cutting in every few minutes like a pump from somewhere in front under the dash. I can only assume that this is something putting in or correcting the air pressure in the front driver side.

Any thoughts?

It seems like every other day I'm finding a new reason to post for something.

Makes me crazy!!!

[Gerald Farris]

Les,
The compressor that supplies the air pressure for the suspension is bolted to the engine and driven from the timing case, so there is no way that you are hearing it. The only thing in the dash area that you might mistake for compressor noise is the electrically driven vacuum pump that supplies vacuum for the dash HVAC (heating, ventilation, and air condition) system. The air control doors in the HVAC system are vacuum operated, and since a diesel does not have manifold vacuum a vacuum pump is necessary.

Measure the coach ride height without leveling the coach after you stop, and check it again in a few hours to see how much the ride height has changed at each wheel location. If you have a sizeable leak, there will be a considerable change. Then you will know where to start looking.

Gerald  

[Les Brandt]

Thanks Gerald.

Given that the left front lowers in time where would I start?

[Gerald Farris]

Les,
The question is how much time? If it is a few hours, it is a leak that should be relatively easy to locate. But if it is a week, you probably will not find it.

Regardless, if the LF is dropping, you should start with the air bags at the LF. There are two on your coach. If there are no leaks at the bags check the supply lines to those air bags. If no leak is still found, the search gets more complicated because you need to check the air control solenoid valves for the LF wheel location, and that will vary depending on whether or not you have air leveling. The best tool to use is a spray bottle with soapy water.

Gerald  

[Les Brandt]

Les,
The question is how much time? If it is a few hours, it is a leak that should be relatively easy to locate. But if it is a week, you probably will not find it.

Regardless, if the LF is dropping, you should start with the air bags at the LF. There are two on your coach. If there are no leaks at the bags check the supply lines to those air bags. If no leak is still found, the search gets more complicated because you need to check the air control solenoid valves for the LF wheel location, and that will vary depending on whether or not you have air leveling. The best tool to use is a spray bottle with soapy water.

Gerald  

Thanks Gerald.

I'll need some ramps. How long do others make them?
Is a 6" rise enough?
For the dualies, do I need to support both tires or will a single width work for here as well?

Les

[Bob Jae]

Les
The ramps I just made were stacked 2X12s for the front tires.  From the Top down I used a 1', 2',3',4',5'  That gave me a little over a 7" lift and the coach easily drives up on them without having to screw them together.  If you do the rear I believe you should support both tires in the rear.  I cut a 45 degree angle on the ends of the boards.

[Richard And Babs Ames]

All tire companies reccomend supporting the whole tire(s) with no overhang off the edges to prevent cord damage. Most motorhomes are close to the tire weight rating for their tire so you should not do anything that would overload the tires.