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#40051 09/09/2003 8:00 PM | Joined: Jan 2002 Posts: 19 New Guy | | New Guy Joined: Jan 2002 Posts: 19 | Where do the vaccum lines run. Do they go from
the manifold to the vaccum pump and then to the
wiper motor? Does anyone have a diagrahm? This
is on a 1950 Chevy 3600, the shop and assembly
manuals are rather unclear. | | |
#40052 09/09/2003 8:16 PM | Joined: May 2000 Posts: 234 Shop Shark | | Shop Shark Joined: May 2000 Posts: 234 | Someone correct me if I'm wrong, but I don't believe the 50's vehicles originally had a vacuum pump. Vacuum was manifold only - and deficiencies are when you mash down on the gas the wipers stop working!  If you have a double action vacuum/fuel pump, you would not use the manifold as a source of vacuum. It's either/or. I've heard a vacuum canister is a nice addition to this setup, to give a more consistent vacuum at low RPMs. Wish I could advise you where to find one... -Boyo
'48 Willys CJ-2A / '55.1 Chevy 3600 / '66 Austin-Healey 3000 / '04 Volvo wagon (parenthood!?)
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#40053 09/09/2003 9:57 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | My service manual says that if you have a double action pump you run the wipers to the pump suction side, then the output side of the pump to the manifold vacuum. The pump is mostly a booster.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#40054 09/10/2003 6:31 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Boyo, they were an option on the AD trucks. If you look in the assembly manual you'll find the instructions on how to plumb them.
Fred
52 3600
69 C-10
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#40055 09/10/2003 2:53 PM | Joined: May 2001 Posts: 1,904 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,904 | The use of a lesser vacuum pump as a "forepump" for a higher vacuum system is pretty common. Here's a diagram for how I plumbed mine, just like 4ontheFloor said. [img] http://pic1.picturetrail.com/VOL137/662484/1080315/33491508.jpg[/img]
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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#40056 09/14/2003 10:49 PM | Joined: Jan 2002 Posts: 19 New Guy | | New Guy Joined: Jan 2002 Posts: 19 | Thanks for the info, the diagram looks like I
was guessing. I will get it up and running soon and give it a whirl | | |
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