Vacuum line schematic for 72.
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Vacuum line schematic for 72.
I have a 72 supposedly with a 360, VIN says 360, but carb listed as on a 390. Can someone tell me or point in the right direction for where the vacuum lines go. The engine was not running good so I checked the vacuum and there was none. I ran the vacuum from the manifold right to the distributor and that helped, but I want to get them on there right. There is some kind of electrical switch on the back of the block that has the vacuum line for the trans hooked to that is not connected right now, but the transmission seems to be working good.
Any help would be appreciated.
Bob
1972 F100 360/C6 100K miles
Any help would be appreciated.
Bob
1972 F100 360/C6 100K miles
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Vacuum line schematic for 72.
The vacuum line that goes to the transmission is part of the emissions control plumbing. At normal temps, there is no vacuum to the vacuum advance on the distributor in 1st and 2nd gear. I think this is how it is set up. The sensor is on the door post on the drivers' door. The distributor should get vacuum from the fitting on the drivers side of the carb. The vacuum comes in when the throttle is open - ported vacuum. Hope this helps .
TomC
TomC
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Vacuum line schematic for 72.
the previous poster has no Idea what he's talking about. If your truck has an automatic transmission, you'll have a vaccum line that runs from ported vaccum to the vaccum modulator on the transmission. this tells your transmission when to shift and allows it to do so. if you have power brakes there will be a large line running from manifold vaccum to the brake booster. the line that goes to the vaccum advance diaphram runs to the middle port of the vaccum switch located on the water neck. the line coming off the top port on the switch goes to ported vaccum, while the one on the bottom port goes to manifold vaccum. If you have a manifold that doesn't have a vaccum switch or you decide not to use the switch, you can just run the line from the vaccum advance diaphram to ported vaccum.
Since this is a 1972 model you shouldn't have to worry about any emissions control lines, but if you do happen to have an EGR valve the vaccum line from it should run to ported vaccum.
Hope this helps clear up any misinformation
John, GM writes my paycheck, But all I drive is FORDS
Since this is a 1972 model you shouldn't have to worry about any emissions control lines, but if you do happen to have an EGR valve the vaccum line from it should run to ported vaccum.
Hope this helps clear up any misinformation
John, GM writes my paycheck, But all I drive is FORDS
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From: Brea CA
Vacuum line schematic for 72.
John, TomC does indeed know what he’s talking about. Crack open some Ford books and take some sensitivity classes man!
These light-duty trucks have a Nox system on the vacuum advance. The ported vacuum from the carb. goes through a solenoid valve that Bob described. Then it goes to the thermal-vacuum switch on the water outlet like John said. The solenoid valve gets its power through a thermal switch in the door jamb. The other end of the solenoid is connected to a pressure switch on the trans. See https://www.ford-trucks.com/dcforum/electrical/147.html
Bob, if you don’t have to worry about inspections, just connect the ported vacuum from the carb. to the dizzy and be done with it, screw the EGR.
Barry
These light-duty trucks have a Nox system on the vacuum advance. The ported vacuum from the carb. goes through a solenoid valve that Bob described. Then it goes to the thermal-vacuum switch on the water outlet like John said. The solenoid valve gets its power through a thermal switch in the door jamb. The other end of the solenoid is connected to a pressure switch on the trans. See https://www.ford-trucks.com/dcforum/electrical/147.html
Bob, if you don’t have to worry about inspections, just connect the ported vacuum from the carb. to the dizzy and be done with it, screw the EGR.
Barry
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Vacuum line schematic for 72.
Thanks Barry... I described the vacuum lines asked for as my '72 has/had them and as is described in the manual. Any deficiencies is probably due to my lack of good communication skills.
Good luck on the project. TomC
Good luck on the project. TomC
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Vacuum line schematic for 72.
Barry,
If I hook the ported to the distributor where should I hook the line from the tranny up too.
Thanks for the info. I have just now gotten back into Ford pickups, had a 1977 F150 4x4 that I had to sell when we moved due to no parking.
Bob
1972 F100 360/C6 100K miles
If I hook the ported to the distributor where should I hook the line from the tranny up too.
Thanks for the info. I have just now gotten back into Ford pickups, had a 1977 F150 4x4 that I had to sell when we moved due to no parking.
Bob
1972 F100 360/C6 100K miles
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From: Brea CA
Vacuum line schematic for 72.
Bob, just a sanity check but could you first verify where this line is attached to on the trans?
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Vacuum line schematic for 72.
Barry,
It hooks to a vacuum diaphram on the rear passenger side on the tranny.
1972 F100 360/C6 100K miles
It hooks to a vacuum diaphram on the rear passenger side on the tranny.
1972 F100 360/C6 100K miles
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From: Brea CA
Vacuum line schematic for 72.
Good, so it’s hooked up down there at least. Attach this line to a manifold vacuum source. Before you do, first try sucking on the hose (not pleasant but we’ve all had to do it sometime) to make sure the diaphragm is not ruptured.
I’m surprised that your tranny shifts ok. Usually when it’s disconnected the trans. will shift hard and late.
I’m surprised that your tranny shifts ok. Usually when it’s disconnected the trans. will shift hard and late.
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Vacuum line schematic for 72.
Barry,
I replaced the tranny diaphram when I changed the filter, it had fluid in it. I messed with it tonight and on the ported vacuum I don't have any vacuum at an idle or when I increase the speed. If I understand right I should have vacuum with increased rpm's, right. If this is right can you give me an idea of what to look for. The port off the manifold has very good vacuum, and I rebuilt the carb about a year ago.
Do you know about the casting numbers on the block. Mine is a 360, I measured the stroke tonight, it was 3.5 inches. This is the number on the intake D3TE9425AM. The number on the block is right behind the altnerator right? The one there has a D then a space then 25 and what looks like an A. Can you tell me what the engine was originally in. The carb came of a 390 according to the ID tag.
Thanks for everything
Bob
1972 F100 360/C6 100K miles
I replaced the tranny diaphram when I changed the filter, it had fluid in it. I messed with it tonight and on the ported vacuum I don't have any vacuum at an idle or when I increase the speed. If I understand right I should have vacuum with increased rpm's, right. If this is right can you give me an idea of what to look for. The port off the manifold has very good vacuum, and I rebuilt the carb about a year ago.
Do you know about the casting numbers on the block. Mine is a 360, I measured the stroke tonight, it was 3.5 inches. This is the number on the intake D3TE9425AM. The number on the block is right behind the altnerator right? The one there has a D then a space then 25 and what looks like an A. Can you tell me what the engine was originally in. The carb came of a 390 according to the ID tag.
Thanks for everything
Bob
1972 F100 360/C6 100K miles
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From: Brea CA
Vacuum line schematic for 72.
Hey Bob, sorry I’ve been kind of busy getting ready to shove off on vacation. You’re right about the ported vacuum, none at idle but just off idle it should start to come on. Something is blocking the flow, maybe a swollen gasket or the wrong one?
On the block, I’ll have to look it up later but the numbers don’t sound familiar. Check and see if there is a date code under the oil filter adapter. Intake is ’73 or later, what are the numbers on the heads (between the center two spark plugs) and the exhaust manifolds?
By the time I get back you probably will have it all figured out with help from everyone else. The FE board can help you too.
Barry
On the block, I’ll have to look it up later but the numbers don’t sound familiar. Check and see if there is a date code under the oil filter adapter. Intake is ’73 or later, what are the numbers on the heads (between the center two spark plugs) and the exhaust manifolds?
By the time I get back you probably will have it all figured out with help from everyone else. The FE board can help you too.
Barry
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