Anyone know the colors of the vacuum hoses and what they connect? I have both black and blue on mine in bits and pieces, was red ever used? I am replacing them all and I'd like to get it close to stock looking.
Vacuum hose colors?
- Thread starter Stevehose
- Start date
Here are a couple diagrams showing colors:
1974 shows black, blue, and red tubes:
Unidentified year shows white, black, and blue tubes:
1972 shows indicates no particular colors:
And this Euro brochure from 1975:
Any insight?
1974 shows black, blue, and red tubes:
Unidentified year shows white, black, and blue tubes:
1972 shows indicates no particular colors:
And this Euro brochure from 1975:
Any insight?
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Steve
I would use the colors from the '74 diagram and use the black and white dashpots for reference. BMW used red, blue, white and black back in those days. I removed all of those lines, etc. including the accel rod delay dashpot, none of them are needed. I now have black braided cloth covered hose for the dizzy advance/retard lines, easier to keep clean.
I would use the colors from the '74 diagram and use the black and white dashpots for reference. BMW used red, blue, white and black back in those days. I removed all of those lines, etc. including the accel rod delay dashpot, none of them are needed. I now have black braided cloth covered hose for the dizzy advance/retard lines, easier to keep clean.
My dist advance and retard hoses connect to hard plastic tubes which run through the spark plug wires tube then reconnect to hoses at the dashpot ends. I am going to keep the stock dashpot and the 2 valves even though they don't do anything. I've removed the other egr stuff. I am dressing up the engine bay with german hose clamps, new braided brake and PS hoses, and would like to put the colored vacuum hose in where appropriate. I hit up that BelMetric place you recommended the other day-great site!
From where did you source the black braided vacuum hose? I cannot find it in the correct metric size (~2.7 mm ID) .
I got mine here, maybe they have your size:
https://www.belmetric.com/hoses-braided-hose-oem-c-14_138.html?zenid=iq4qmprlhkf1eqps0uvf76tus4
https://www.belmetric.com/hoses-braided-hose-oem-c-14_138.html?zenid=iq4qmprlhkf1eqps0uvf76tus4
Booster uses wire reinforced 12x19 size.
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I went ahead and made my own adjustments to the 1972 diagram to reflect my previous EGR removal and balance tube mods:
Original diagram:
I took 61Porsche's balancing idea to the extreme and linked all vacuum ports to their respective advance/retard connections so both carbs have a connection to each other and then teed for the dist connection. Probably doesnt do anything but what the heck it looks clean. Added new red and blue hoses for a little period color (correct or not) to the engine compartment:
Original diagram:
I took 61Porsche's balancing idea to the extreme and linked all vacuum ports to their respective advance/retard connections so both carbs have a connection to each other and then teed for the dist connection. Probably doesnt do anything but what the heck it looks clean. Added new red and blue hoses for a little period color (correct or not) to the engine compartment:
blumax
(deceased)
Steve--noticed extra hose--
coming out of WSW reservoir cap. That's not correct. The only hose to the squirters originates at the WSW pump but none should be coming out of cap.
coming out of WSW reservoir cap. That's not correct. The only hose to the squirters originates at the WSW pump but none should be coming out of cap.
Interesting - that's the way it came to me from PO - it's teed underneath and works - but why would it be rigged that way?
Best Guess?
I think it has to do with two things:
1. The washer squirter change during production from tube type on the body to chrome fitting type on the hood.
2. Headlight washing system.
The parts diagram show three different ways if you count the dual pump and the production years aren't very clear. It looks like the early ones didn't have the second hose, but again who knows what could have happened over the years w/ replacement.
I have the hole in the cap, but the line nor T isn't there. I have the tubing type squirters too. Replacement caps aren't the same; now black.
I think it has to do with two things:
1. The washer squirter change during production from tube type on the body to chrome fitting type on the hood.
2. Headlight washing system.
The parts diagram show three different ways if you count the dual pump and the production years aren't very clear. It looks like the early ones didn't have the second hose, but again who knows what could have happened over the years w/ replacement.
I have the hole in the cap, but the line nor T isn't there. I have the tubing type squirters too. Replacement caps aren't the same; now black.
Looks like in this diagram, hose 4 and 19 go into the lid? I have squarish black hose fittings on the hood that look like #13.
