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Old 10-23-2019, 07:05 AM   #1
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Safe to pressure-wash this area? And exhaust pipe question.

This is the current state of my bus:

IMG_0720.jpg

This area is extremely dirty and grimy, and once I get the missing exhaust pipe fixed I'm planning on driving to a do-it-yourself car wash (with 10'4" clearance, fingers crossed) and giving this area in particular as thorough a cleaning as I can (spraying down from inside).

I'm not really sure what's there - is this a place I can spray willy-nilly without worrying about anything, or are there parts I should keep away from?

For my exhaust pipe, the parts I'm going to connect to have a lot of surface rust but are still solid - I was thinking about spraying ospho on the exhaust pipe and then painting it with POR-15. Good or bad idea?
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Old 10-27-2019, 07:44 PM   #2
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I'm no bus expert but I run a fleet washing service and we spray soap and water into every nook and cranny we can find in the frame of the trucks we wash. Should be fine.
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Old 10-27-2019, 09:17 PM   #3
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Nothing there that doesn't see splashing on a regular basis, spray away. The only thing I would watch for is any electric harness connections.
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Old 10-27-2019, 10:59 PM   #4
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I just got done spraying then de-greasing, then spraying and then spraying one final time the entire undercarriage of our bus! turned out great and crank up fine after. Super messy job but looks nice now and will be alot better when working underneath. Check out our channel we will have a video up in the next couple weeks that shows me soaking wet, covered in grime and mud! https://youtu.be/HlehgOIA3xk
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Old 10-28-2019, 10:06 AM   #5
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You can wash all of that, but there are certain spots you should be careful of so as to not ruin anything.

For instance try and avoid the axle vent. You can wash it off, but you don't want soap and water getting passed the breather and into the axle.

Same thing with the U-joints, Don't spray to closely too them or you'll blow pass the seals and push water and dirt into the needles.

There might also be an abs controller back there, don't spray on that too hard either.
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Old 10-28-2019, 10:37 AM   #6
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Originally Posted by Booyah45828 View Post
You can wash all of that, but there are certain spots you should be careful of so as to not ruin anything.

For instance try and avoid the axle vent. You can wash it off, but you don't want soap and water getting passed the breather and into the axle.

Same thing with the U-joints, Don't spray to closely too them or you'll blow pass the seals and push water and dirt into the needles.

There might also be an abs controller back there, don't spray on that too hard either.
What do the axle vent and the u-joints look like? And what does the ABS controller look like? I think something has already happened with the ABS controller as a result of the demolition - my ABS light has been on on the dashboard since I got my bus back.
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Old 10-28-2019, 10:46 AM   #7
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What do the axle vent and the u-joints look like? And what does the ABS controller look like? I think something has already happened with the ABS controller as a result of the demolition - my ABS light has been on on the dashboard since I got my bus back.
The U-joints are at the ends of the driveshaft sections to allow for flex and alignment.

The abs controller will have the brake hoses/lines come together at a junction box that will also have wiring coming into it. Probably easiest to follow the brake line and sensor wire from the rear disc/drum to see where it goes.

The axle vent is often a small nipple located on the top of the differential housing. It may have a metal cap that seems a loose/sloppy fit -- that's to allow air movement.
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Old 10-29-2019, 04:36 AM   #8
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On your bus, the breather will most likely have a little differential oil wetting the outside edge of the breather. I doubt yours has been cleaned EVER, so the presence of differential oil will help identify it and should also be expected instead of alarm you.


I was under mine looking at the differential in preparation for changing the oil. I noticed our breather (top front towards the passenger side) did have some differential oil on the rim. Ours is a Merritor differential.
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Old 10-29-2019, 08:48 AM   #9
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Take a picture from above the differential if you can and I'll try to label it all for you.
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Old 10-29-2019, 10:44 AM   #10
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Take a picture from above the differential if you can and I'll try to label it all for you.
Cool, thank you. I'll take some more pics when I'm over there this afternoon.
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