Toyota Aisan Carburetor Manual Toyota Corolla 2e Engine Carburetor Manual Toyota Corolla 2e Engine Manual Free Toyota Corolla Carburetor Manual Toyota corolla aisan carburetor mod. Anyone here have an electric choke Aisan and know if it's adjustable? Loosened, then you simply rotate the control housing in either direction for adjustment. Nov 18, 1980 A mixture adjusting screw in a carburetor for regulating the fuel efflux during engine idling is provided in which the end needle portion of the screw is located in the idle port of the carburetor and a spring is loaded around the rod portion of the screw to hold the screw in position after adjustment so as to maintain its proper adjustment. Free carburetor manuals for most carburetors. Helpful information you need when you rebuild your carburetor. Download manuals for Carter, Holley, Autolite, Motorcraft, Rochester, Stromberg, Solex, Marvel Schebler, Zenith.
Aisan Carburetor Parts
CARBURETOR CLINIC
AISAN This Aisan carb appears on 1981-86 Toyota Tercels. Although many technicians consider this unit to be bulletproof, some problems do occur with it. Probably the most common breakdown on this carb is auxiliary accelerator pump (AAP) failure. Some techs argue that as long as the AAP holds vacuum, it's okay. Others say that any sign of fuel residue in its vacuum nipple
or vacuum line is reason for replacement. Experience has shown that a good-working AAP may have some fuel residue present. Usually, it pays just to replace it to prevent a potential comeback.
Remember that due to the way its vacuum supply is controlled, the AAP only works when the engine's cold. But a leaking AAP diaphragm can cause the engine to load up fairly quickly and often fouls out number one spark plug. You may also encounter hesitation problems, er ratic hesitation problems, an erratic idle, or a slightly rougher-than-normal idle on a Tercel. If you do, check the vacuum modulator valve next to the EGR valve. This valve helps control EGR operation. —By Dan Marinucci
1
AAP DIAPHRAGM FAILURE If the auxiliary accelerator pump (AAP) diaphragm fails, the engine sucks fuel through it and loads up when cold. AAP failure usually causes a fuel-diluted crankcase, so plan on changing the oil and filter too. Toyota does sell the AAP separately.
2
YELLOW MEANS HANDS OFF! See the daub of yellow paint on the screw in the AAP cover? Whenever you find yellow paint on part of an Aisan carb, it means it's a factoryset adjustment. Disturb such an ad justment at your own risk!
FREE THE WIRES
IDLE SOLENOID HERE
I've found it's worth a few extra minutes to remove these wires from the harness connector. That way, you don't twist them up or break a connection when you're
Remember that the single-wire solenoid on the chokespring side of the carb is the idle cut-off solenoid. When the engine won't idle, check this solenoid and its circuit first.
SECONDARY SOLENOID OPERATION
LITTLE STUD, BIG TROUBLE
The secondary solenoid on this carburetor shuts off the fuel to the secondary fuel transfer circuit during deceleration. This reduces decel emissions. If this solenoid fails to open, you'll feel a lag or hesitation when the secondary opens up.
Note that the air cleaner stud only threads into the air horn. The stud's threads never reach the carburetor bowl casting. So if some musclehead overtightens the air cleaner wing nut, he could warp the air horn.
CHOKE BLADE BINDUP
POWER CIRCUIT VACUUM LEAK
Whenever you have a hard-start or cold-driveability complaint on a Tercel, be sure the choke blade moves freely. If cleaning the choke shaft with carb cleaner
If the air horn's warped, it can cause a vacuum leak at this power circuit vacuum passage. The lower-thannormal vacuum signal to the power piston causes a rich condition because it allowrs the power valve to
removing or reinstalling a solenoid. Who wants to risk an intermittent connection here?
spray doesn't free up a sticking choke, you know the air horn's probably warped.
open too early and too often.
GOOD AND FLAT HERE
DRILL HERE!
When in doubt, straightedge this area of the air horn. If the air horn's warped more than a few thousandths here—and the engine has warped air horn-related symptoms—it's time for a new air horn or a new
Don't be fooled by that big aluminum plug. The anti-
tampering plug covering the idle mixture screw is
directly below the big aluminum D-shaped plug. Hold the carb steady and carefully center-punch this plug
carburetor.
before you begin drilling.
CLOSE QUARTERS
SOFT SLOT
See the mark I made near the end of this rod? That's all the space you have (about %6 inch) between the plug
and the idle mixture screw. Stop drilling as soon as
you feel the bit go through the plug or you'll drill right into the mixture screw!
A DIRTY JET IS AN IDLE JET
The slot in this brass idle mixture screw will distort and open up easier than you think. Be sure your
screwdriver fits snugly in the slot. Also, the quicker you complete your mixture adjustment, the less chance you have of distorting the slot.
SMOOTH SECONDARY MOVEMENT
Yes, the Aisan's idle jet resembles the idle jet in lots
Always check for smooth, free secondary throttle shaft
you treat the others. Remove it, flush it out, and flush
and sticks. Soak the shaft in penetrating oil until you
of other Japanese carburetors. Treat it the same way out its passage too.
movement. Sometimes, the secondary shaft rusts up
free it up.
REMOVE LINKAGE FIRST
ONLY CABINET TIPS WILL FIT
You can't cheat here. Before you can get a wrench or a socket onto this jet access plug, you have to remove the linkage from this side of the primary throttle shaft.
A standard screwdriver such as this one won't fit through the jet access holes. You need a screwdriver with a tip that's the same size as its shank. Tool companies call these cabinet-type, cabinet-tip, or
carburetor-tip screwdrivers.
REMEMBER THE JET GASKETS
PUMP DISCHARGE SEAL
Whether you're removing or installing the main jets in this Aisan carb, it's easy to overlook these little gaskets or sealing washers. There's one gasket on the
If you want the accelerator pump circuit to work prop
primary main jet and one on the secondary main jet.
erly, remember to install this seal on top of the weight in the discharge passage. Otherwise, you'll have a
heckuva leak in that circuit when the pump tries to pump fuel through it.
AAP CHECK BALL SPRING This spring and threaded plug hold the AAP check
ball in place. If you mix this spring up with the one in the main accelerator pump passage, just remember that the AAP circuit's spring is the shorter of the two.
SEAL INSTALLATION TIP If you want to be sure that this accelerator pump seal doesn't pop out on you, hold it down with a thin feeler
gauge. After you install the air horn, just pull the feeler gauge out and start the air horn screws.
AISAN This Aisan carb appears on 1981-86 Toyota Tercels. Although many technicians consider this unit to be bulletproof, some problems do occur with it. Probably the most common breakdown on this carb is auxiliary accelerator pump (AAP) failure. Some techs argue that as long as the AAP holds vacuum, it's okay. Others say that any sign of fuel residue in its vacuum nipple
or vacuum line is reason for replacement. Experience has shown that a good-working AAP may have some fuel residue present. Usually, it pays just to replace it to prevent a potential comeback.
Remember that due to the way its vacuum supply is controlled, the AAP only works when the engine's cold. But a leaking AAP diaphragm can cause the engine to load up fairly quickly and often fouls out number one spark plug. You may also encounter hesitation problems, er ratic hesitation problems, an erratic idle, or a slightly rougher-than-normal idle on a Tercel. If you do, check the vacuum modulator valve next to the EGR valve. This valve helps control EGR operation. —By Dan Marinucci
1
AAP DIAPHRAGM FAILURE If the auxiliary accelerator pump (AAP) diaphragm fails, the engine sucks fuel through it and loads up when cold. AAP failure usually causes a fuel-diluted crankcase, so plan on changing the oil and filter too. Toyota does sell the AAP separately.
2
YELLOW MEANS HANDS OFF! See the daub of yellow paint on the screw in the AAP cover? Whenever you find yellow paint on part of an Aisan carb, it means it's a factoryset adjustment. Disturb such an ad justment at your own risk!
FREE THE WIRES
IDLE SOLENOID HERE
I've found it's worth a few extra minutes to remove these wires from the harness connector. That way, you don't twist them up or break a connection when you're
Remember that the single-wire solenoid on the chokespring side of the carb is the idle cut-off solenoid. When the engine won't idle, check this solenoid and its circuit first.
SECONDARY SOLENOID OPERATION
LITTLE STUD, BIG TROUBLE
The secondary solenoid on this carburetor shuts off the fuel to the secondary fuel transfer circuit during deceleration. This reduces decel emissions. If this solenoid fails to open, you'll feel a lag or hesitation when the secondary opens up.
Note that the air cleaner stud only threads into the air horn. The stud's threads never reach the carburetor bowl casting. So if some musclehead overtightens the air cleaner wing nut, he could warp the air horn.
CHOKE BLADE BINDUP
POWER CIRCUIT VACUUM LEAK
Whenever you have a hard-start or cold-driveability complaint on a Tercel, be sure the choke blade moves freely. If cleaning the choke shaft with carb cleaner
If the air horn's warped, it can cause a vacuum leak at this power circuit vacuum passage. The lower-thannormal vacuum signal to the power piston causes a rich condition because it allowrs the power valve to
removing or reinstalling a solenoid. Who wants to risk an intermittent connection here?
spray doesn't free up a sticking choke, you know the air horn's probably warped.
open too early and too often.
GOOD AND FLAT HERE
DRILL HERE!
When in doubt, straightedge this area of the air horn. If the air horn's warped more than a few thousandths here—and the engine has warped air horn-related symptoms—it's time for a new air horn or a new
Don't be fooled by that big aluminum plug. The anti-
tampering plug covering the idle mixture screw is
directly below the big aluminum D-shaped plug. Hold the carb steady and carefully center-punch this plug
carburetor.
before you begin drilling.
CLOSE QUARTERS
SOFT SLOT
See the mark I made near the end of this rod? That's all the space you have (about %6 inch) between the plug
and the idle mixture screw. Stop drilling as soon as
you feel the bit go through the plug or you'll drill right into the mixture screw!
A DIRTY JET IS AN IDLE JET
The slot in this brass idle mixture screw will distort and open up easier than you think. Be sure your
screwdriver fits snugly in the slot. Also, the quicker you complete your mixture adjustment, the less chance you have of distorting the slot.
SMOOTH SECONDARY MOVEMENT
Yes, the Aisan's idle jet resembles the idle jet in lots
Always check for smooth, free secondary throttle shaft
you treat the others. Remove it, flush it out, and flush
and sticks. Soak the shaft in penetrating oil until you
of other Japanese carburetors. Treat it the same way out its passage too.
movement. Sometimes, the secondary shaft rusts up
free it up.
REMOVE LINKAGE FIRST
ONLY CABINET TIPS WILL FIT
You can't cheat here. Before you can get a wrench or a socket onto this jet access plug, you have to remove the linkage from this side of the primary throttle shaft.
A standard screwdriver such as this one won't fit through the jet access holes. You need a screwdriver with a tip that's the same size as its shank. Tool companies call these cabinet-type, cabinet-tip, or
carburetor-tip screwdrivers.
REMEMBER THE JET GASKETS
PUMP DISCHARGE SEAL
Whether you're removing or installing the main jets in this Aisan carb, it's easy to overlook these little gaskets or sealing washers. There's one gasket on the
If you want the accelerator pump circuit to work prop
primary main jet and one on the secondary main jet.
erly, remember to install this seal on top of the weight in the discharge passage. Otherwise, you'll have a
heckuva leak in that circuit when the pump tries to pump fuel through it.
AAP CHECK BALL SPRING This spring and threaded plug hold the AAP check
ball in place. If you mix this spring up with the one in the main accelerator pump passage, just remember that the AAP circuit's spring is the shorter of the two.
SEAL INSTALLATION TIP If you want to be sure that this accelerator pump seal doesn't pop out on you, hold it down with a thin feeler
gauge. After you install the air horn, just pull the feeler gauge out and start the air horn screws.
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Aisan Carburetor Manual Download For Windows 7
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