| Wiper motor return line question [message #359233] |
Wed, 07 October 2020 16:59  |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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My windshield wiper return line is in very poor condition, most likely original.
Three questions please:
1. What kind of hose do I need to replace it with?
2. When I pull it off, is oil going everywhere?
3. Will I have to somehow bleed the wiper motor once the line is replaced? If so, how do I do that?
Thank you.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: Wiper motor return line question [message #359235 is a reply to message #359233] |
Wed, 07 October 2020 17:34  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Greg C. wrote on Wed, 07 October 2020 17:59My windshield wiper return line is in very poor condition, most likely original.
Three questions please:
1. What kind of hose do I need to replace it with?
2. When I pull it off, is oil going everywhere?
3. Will I have to somehow bleed the wiper motor once the line is replaced? If so, how do I do that?
Thank you.
Greg,
I replaced mine years ago with a small piece of the barricade fuel line that I bought a lot of when I was hammering the fuel system.
The only pressure that should be in that line will be the static head from the reservoir at the pump.
In a word - NO You will have to replace the lost fluid, but that should be it.
If you cut length of hose before you take things apart, the swap should be pretty clean.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Wiper motor return line question [message #359236 is a reply to message #359233] |
Wed, 07 October 2020 17:43 |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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Thank you for the quick reply. I will purchase some fuel line and get it changed. I'm guessing it's 3/8" ID line.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: Wiper motor return line question [message #359237 is a reply to message #359233] |
Wed, 07 October 2020 17:47 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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It is really a lower pressure return line. Anything that will not disintegrate over time with oil / PS fluid running through it will work.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Wiper motor return line question [message #359244 is a reply to message #359233] |
Wed, 07 October 2020 19:04 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Greg,
Are you referring to the line between the power steering box and the wiper
motor, or to the line from the motor to the reservoir?
The first of those is under up to 1500 psi of hydraulic pressure so must be
made up of similarly rated hose with swaged on fittings. The second, the
true "return hose" should not see a lot of pressure, so "Power Steering
Return Hose" (generally rated at 200 psi), available at most auto
parts houses, with spring or aviation clamps at each end, will suffice.
Yes, you're going to have a mess of power steering fluid, no matter where
you disconnect it. Especially when you disconnect from the reservoir --
its contents WILL pour out -- hopefully in your provided catch basin. :-)
By the way, most, if not all (I really don't remember if it varies by
year), GMC's have TWO return hoses -- one from the motor to a vertical
metal tube beside the radiator and another from the bottom of that tube to
the reservoir. So you want need as much of that $2+ per ft. hose.
While you've got the mess anyway, go ahead and clean the wiper filter
screen with solvent (that's in the brass tube connecting the motor and the
return hose).
HTH,
Ken H.
On Wed, Oct 7, 2020 at 6:00 PM Greg Crawford via Gmclist <
gmclist@list.gmcnet.org> wrote:
> My windshield wiper return line is in very poor condition, most likely
> original.
>
> Three questions please:
>
> 1. What kind of hose do I need to replace it with?
>
> 2. When I pull it off, is oil going everywhere?
>
> 3. Will I have to somehow bleed the wiper motor once the line is replaced?
> If so, how do I do that?
>
>
> Thank you.
> --
> Greg Crawford
> Knoxville, TN
>
> 1977 Royale
> 403
> Rear Bath
> American Eagle Wheels
> Alex Sirum Quad bags
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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