Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 04-28-2022, 12:10 PM   #1
Bus Nut
 
Tejon7's Avatar
 
Join Date: Mar 2020
Location: Western MT
Posts: 479
Year: 1990
Chassis: Crown Supercoach
Engine: Detroit 6-71TA, 10 sp.
Rated Cap: 90 (40')
Air wipers - soft rubber tubing?

I bought a new air wiper motor (Sprague HP-200), and it came with barb fittings and soft rubber tubing installed from the factory. This tubing has no markings to determine manufacturer, air pressure rating, etc. I hooked the tubing up to my air compressor and tested the motor at 120 psi and everything seems to work fine. Ideally, I would just change out the fittings and run 1/4 nylon air lines, but these barb fittings seem to be integrated into the motor's valve (it's a non-standard HP-200, see long story below for more on that).

Is it ok to use these soft rubber hoses and somehow splice them onto 1/4 nylon air line that runs from the wiper valve on the dash? Correct me if I'm wrong, but it seems like the worst thing that could happen is that the rubber tubing pops off and my wiper stops working.


Now for the long backstory, for any that are interested:

My right air wiper had a bad leak, so I am in the process of replacing it. The original was a Sprague Air Push II, build date 1986. I couldn't find a direct replacement or the parts I needed to fix the old one. The official replacement is a Sprague HP-200, which would cost ~$210. I found a passenger side HP-200 on Ebay for $8 plus shipping, so I took a gamble and bought it. This cheap version had a couple issues with it, two of which I planned for and one that caught me off guard.

First off, the replacement did not have the correct shaft. I guessed/hoped that the shaft from my original wiper motor could be swapped into the new one. Turns out I was right. The old Air Push II shaft was a perfect fit in the new HP-200 motor.

Second, the new motor was an "ECAM" model, meaning that while still being air powered, it was designed to hook up to a computer control unit that modulated air flow, resulting in several discreet wiper speeds and an intermittent speed. I hoped that I could just disable or bypass all that electrical stuff and get a really cheap old-fashioned air motor. I got lucky again and didn't even need to modify anything. The fancy electrical solenoids slide right off, and the motor works perfectly when hooked up to the old "In" and "park" air lines.
Click image for larger version

Name:	s-l1600.jpg
Views:	4
Size:	168.7 KB
ID:	65157
I took this image from another listing on Ebay, but it's basically the same ECAM HP-200 that I bought

The third issue is the soft rubber tubing mentioned at the top of this overly-long post. This motor valve assembly has long skinny shafts that the black plastic solenoids slide over. The shafts terminate in a barb fitting, and the whole shaft + barb don't look like they can be removed and replaced with a standard air line connection.

Sorry for the long post - the actual question was way back in paragraph #2

Tejon7 is offline   Reply With Quote
Old 07-01-2022, 02:10 PM   #2
Bus Nut
 
Tejon7's Avatar
 
Join Date: Mar 2020
Location: Western MT
Posts: 479
Year: 1990
Chassis: Crown Supercoach
Engine: Detroit 6-71TA, 10 sp.
Rated Cap: 90 (40')
Update: this $8 air wiper motor seems to be working just fine without any special pampering. At the moment I have the soft rubber tubing that I was so worried about jammed onto the existing 1/4" nylon air line. The only time that weak splice is pressurized is when the air wiper valve is "on", and in that case a lot of air is moving through the wiper motor. I don't think there is an opportunity for static air pressure to build up and pop the rubber tubing off the nylon air line. Time will tell if this fix is permanent, but it seems good so far...
Tejon7 is offline   Reply With Quote
Old 07-01-2022, 04:05 PM   #3
Bus Nut
 
Rwnielsen's Avatar
 
Join Date: Jun 2020
Location: Long Beach, CA
Posts: 809
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000, 40' MPV
Engine: 5.9 Cummins/B300 trans
Rated Cap: U/K
That looks like a great deal for $8. I would expect that solenoid costs $8 bucks on its own. Probably works a lot better than the vacuum ones of yesteryear, they were the worst
Rwnielsen is online now   Reply With Quote
Old 07-02-2022, 10:54 AM   #4
Bus Nut
 
Join Date: Mar 2017
Location: iowa
Posts: 713
Year: 1998
Coachwork: bluebird
Chassis: chevy
Engine: 3116 catapillar
Rated Cap: formerly 71 now 2 or 4
you can heat up the hard plastic air line and push it onto barbed fittings if the id is the same as the rubber id. buy a barbed fitting put it in a vice and get a piece of plastic air line and practice one or two. a heat gun works as i have tried a propane torch with poor results. i also used the heat gun to bend and form my grey electrical conduit so i did not have to buy a bunch of elbows and connectors
mmoore6856 is offline   Reply With Quote
Old 07-03-2022, 03:00 PM   #5
Bus Nut
 
Tejon7's Avatar
 
Join Date: Mar 2020
Location: Western MT
Posts: 479
Year: 1990
Chassis: Crown Supercoach
Engine: Detroit 6-71TA, 10 sp.
Rated Cap: 90 (40')
Quote:
Originally Posted by mmoore6856 View Post
you can heat up the hard plastic air line and push it onto barbed fittings if the id is the same as the rubber id. buy a barbed fitting put it in a vice and get a piece of plastic air line and practice one or two. a heat gun works as i have tried a propane torch with poor results. i also used the heat gun to bend and form my grey electrical conduit so i did not have to buy a bunch of elbows and connectors

That's a great idea. We're taking the bus out on a trial run camping trip, but I'll try this out when we get home. Thanks!
Tejon7 is offline   Reply With Quote
Old 07-04-2022, 02:16 PM   #6
Bus Crazy
 
HamSkoolie's Avatar
 
Join Date: Jul 2021
Location: Southern Oregon
Posts: 1,185
Year: 1996
Coachwork: AmTran (Now Navistar)
Engine: DT444E (7.3L) International
Rated Cap: 31,800 pounds
Quote:
Originally Posted by Rwnielsen View Post
That looks like a great deal for $8. I would expect that solenoid costs $8 bucks on its own. Probably works a lot better than the vacuum ones of yesteryear, they were the worst

Oh you young uns.


THE WORST were the ones where YOU flipped a lever back and forth on the inside of the windshield so that the wipers would move on the outside.
__________________
YouTube: HAMSkoolie WEB: HAMSkoolie.com
We've done so much, for so long, with so little, we now do the impossible, overnight, with nothing. US Marines -- 6531, 3521. . . .Ret ASE brakes & elect. Ret (auto and aviation mech). Extra Class HAM, NAUI/PADI OpenWater diver
HamSkoolie is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 02:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2022, vBulletin Solutions, Inc.