If you're staring down the throat of your carburetor trying to figure out why your engine is idling like a lawnmower, a weber 32 36 diagram is probably the first thing you need to pull up on your phone. These little Italian-designed (and now mostly Spanish-made) units are basically the Swiss Army knives of the automotive world. They've been slapped onto everything from old Datsuns and BMW 2002s to Jeeps and Fords. But even though they're famous for being reliable, they can be a bit of a headache if you don't know what you're looking at.
I've spent more hours than I'd like to admit hunched over a fender with a flathead screwdriver and a can of carb cleaner. The first time you see an exploded view of a 32/36 DGV or DGEV, it looks like a clock exploded. There are tiny brass bits, springs, and gaskets everywhere. But once you break down that diagram, you realize it's actually a pretty logical piece of machinery.
What Exactly Are You Looking At?
When you first pull up a weber 32 36 diagram, the most important thing to grasp is that this is a progressive carburetor. That's what the "32/36" stands for. One barrel is 32mm and the other is 36mm. Under normal driving—like when you're just cruising to the grocery store—only the smaller 32mm barrel is open. This keeps your fuel economy from going completely down the drain.
The diagram will show you two distinct "throats." The primary side (the 32mm one) handles the idle and low-speed stuff. The secondary side (the 36mm one) only kicks in when you really mash the pedal. If you look at the linkage on the side of the carb, you'll see how one lever eventually catches the other. It's a clever bit of engineering that makes these carbs way more drivable than the old-school "all or nothing" setups.
Decoding the Main Components
If you're trying to rebuild the thing, the diagram is going to point out a bunch of numbered parts. Some of these are way more important than others for the average DIYer.
The Jets and Emulsion Tubes
These are the tiny brass screws that live inside the carb. On a weber 32 36 diagram, you'll see the main jets at the bottom of the float bowl. They control how much fuel gets sucked up when you're actually moving. Then you've got the air corrector jets sitting on top of the emulsion tubes. Think of the emulsion tube as a straw with holes in it; it mixes air with the fuel before it gets sprayed into the engine. If these are clogged—which happens a lot if your car has been sitting—the car will stumble as soon as you try to accelerate.
The Accelerator Pump
This is a frequent culprit for "dead spots" when you hit the gas. The diagram will show a small diaphragm held in by four screws. When you poke the throttle, this pump squirts a little stream of raw gas into the primary barrel. If that diaphragm is cracked or the little "nozzle" (the pump jet) is blocked, the engine will bog down because it's getting too much air and not enough fuel for a split second.
The Float and Needle Valve
This is basically the toilet tank mechanism of your car. The float sits in a bowl of gas, and as the level rises, it pushes a needle into a seat to stop the fuel flow. If you look at your weber 32 36 diagram, it'll show you exactly how that needle sits. Setting the "float height" is probably the most critical part of a rebuild. If it's too high, the carb overflows and leaks gas everywhere (not fun). If it's too low, the car will starve for fuel when you're going up a hill or driving fast.
Identifying those Pesky Vacuum Ports
This is where things get really confusing for people. Most 32/36 models have a few different vacuum nipples sticking out of the base. If you don't have a weber 32 36 diagram to guide you, it's easy to hook your distributor up to the wrong one.
Most of the time, you're looking for "ported vacuum." This is a port that doesn't have any suction at idle but starts sucking air as soon as you crack the throttle. This is usually what goes to your distributor's vacuum advance. If you hook it up to "manifold vacuum" (which sucks hard all the time), your timing will be all wonky, and the car will run hot or idle poorly. Usually, the ported vacuum nipple is located just above the throttle plates, while the manifold ports are down at the very bottom or on the intake manifold itself.
The Three Types of Chokes
Depending on which version of the 32/36 you have, the diagram might look a little different around the top. The "DGV" is a manual choke—it has a cable that goes into the cabin. The "DGEV" has an electric choke, which looks like a round black plastic cap on the side with a wire going to it. Then there's the "DGAV," which uses engine coolant to open the choke.
If your car won't start when it's cold, or if it stays revved up way too high even after it's warm, the choke is usually the problem. The diagram shows how the choke butterflies (the flaps at the very top) are connected to the fast-idle cam. Sometimes that cam gets gummed up with old oil and dirt, and it just needs a good spray of cleaner to move freely again.
Why You Should Keep a Diagram Handy
I've seen people try to "wing it" when taking these carbs apart, and it almost always ends in tears. There are tiny little O-rings on the idle mixture screws that are easy to lose. There's also a tiny check-ball weight inside the accelerator pump circuit that will fall out if you flip the carb over. Without a weber 32 36 diagram, you'll never know where that little ball was supposed to go, and your car will never drive right again.
It's also great for troubleshooting. Let's say your car idles fine but dies the second you touch the gas. You look at the diagram, find the "idle jet" (which is actually on the outside of the carb on these models), and realize it's easy to pull out and clean without even taking the whole carb off the car. It saves you hours of unnecessary work.
A Few Tips for the "Real World"
While a weber 32 36 diagram tells you where things are, it doesn't always tell you how to feel for problems. Here are a few things I've learned the hard way:
- Don't overtighten: Those brass jets are soft. If you crank down on them like you're tightening a lug nut, you'll strip them. Just snug is enough.
- Check for air leaks: Even a perfectly built Weber won't run right if the base gasket is leaking air. If you spray a little carb cleaner around the base while the engine is running and the RPMs change, you've got a leak.
- The "Lean Best Idle" trick: When you're adjusting that mixture screw (usually shown at the base of the carb in your diagram), turn it in until the engine starts to stumble, then back it out about a half-turn until it smooths out. That's usually the sweet spot.
Anyway, these carbs are a blast once you get them sorted. They make an old engine feel way more responsive and give you that classic "induction growl" that modern fuel-injected cars just don't have. Just keep that weber 32 36 diagram open on your workbench, take your time, and don't lose that tiny little check-ball. You'll be back on the road in no time.