How To Change Primer Bulb On Toro Lawn Mower

Small-scale engines power all kinds of power tools, machines, and outdoor equipment types, and most small gas-powered engines use a primer bulb system for cold starting. The usefulness of primer bulbs is often under-appreciated until tool users go to start their machines and find their engine's primer bulb excessively worn, cleaved, or cracked. Cold starting a gas engine without a fresh eject of fuel in the carburetor is difficult to say the to the lowest degree .

Because primer bulbs are made of either plastic or rubber, replacing them is ane of the about mutual pocket-sized engine repairs. Tool owners should wait primer bulbs to eventually wear out. Steps and examples for ii common types of small engine primer bulb replacements are explained and listed below. Reasons to Supervene upon a Primer Bulb
A cracked, worn, or broken primer bulb is the near mutual reason for replacing ane, but in that location are a number of other reasons why it might be a good idea to install a new seedling when the old i has not completely worn out yet.

• When replacing fuel lines:

If you lot're performing a fuel line repair on your tool'due south engine, information technology's most likely because the plastic fuel lines are cracked with age or wear. Because plastic fuel lines and primer bulbs are ordinarily the same age, they work equally good barometers for each others' vesture.

In other words, if one wears out and cracks, you lot can expect the other to follow soon.

Since a fuel line replacement requires a parts order and work in that part of the engine, information technology just makes sense to guild a primer seedling at the aforementioned fourth dimension to save money on shipping.

• When cleaning the carburetor:

Primer bulbs are often located on or near an engine's carburetor. Specially in the instance of primer bulbs located on the carburetor, yous tin save yourself time on future repairs by replacing the bulb when dismantling and cleaning the carburetor anyhow.

• When performing any other work on the engine'due south fuel system:

If it's been more than a season or two since your tool's engine got a new primer bulb, you'll give thanks yourself afterward for replacing information technology pretty much whatever time you have a good alibi. [Back to top] Primer Bulb Mount Types
Information technology wouldn't be possible to show specific steps for every primer seedling mounting design on the market, but we can explicate general repair steps for a couple of primer bulb types that are very common. Fifty-fifty though minor differences volition exist between each specific engine's primer seedling design, primer bulb repairs share similar qualities. Information technology's probable that seeing the steps for replacing the bulb in 1 design volition help you lot to supercede the bulb in some other kind of engine.
We list and explain the steps for replacing 2 types of primer bulbs below, designs where the primer bulb mounts directly on the engine's carburetor, and designs where the primer seedling mounts remotely from the carb. We use two different trimmers for our sit-in examples beneath, a Shindaiwa T242 Trimmer and a McCulloch trimmer. Because both demonstration models are 2-cycle trimmers, the repair steps and demonstration video in this article will be virtually helpful with primer bulb replacements on power tools designed with ii-cycle engines. [Back to top]
Primer Bulb on Carburetor Repair Steps Primer bulbs mount directly on the carburetor for many small engine designs. Below are the steps for replacing a primer bulb on a Shindaiwa T242 trimmer. These steps volition be similar for other engine designs that mount primer bulbs on the engine's carburetor, but not verbal. Reviewing these steps volition likely help with primer seedling replacements on other engines. 1. Admission the carburetor.

To remove the onetime primer seedling, the trimmer'due south carburetor must be accessed.

The first steps toward accessing the carburetor are to remove the air cleaner cover and the air filter. 2. Unscrew the two carburetor mount screws.

The entire carburetor associates will pull away from the trimmer afterward the ii mount screws are costless. Pull the choke plate away from the carburetor and set it aside.

The carburetor is now completely accessible. 3. Remove the old primer bulb.

The Shindaiwa T242 has four screws that mount the primer bulb plate to the carburetor. These must be unscrewed.

Exist prepared for a footling gas to leak out after the quaternary screw is released. In one case away from the carburetor, the one-time primer seedling should hands pop right out of the mount plate.

The erstwhile primer bulb is now removed. 4. Clean the carburetor and primer bulb components.

Have a little actress care to wipe clay and oil away from the recently disassembled carburetor before putting information technology dorsum together. v. Install the new primer bulb.

For the T242, the primer bulb can be pressed into identify in the mountain plate from which the former bulb came.

Before the primer bulb plate tin can be screwed back into place on the carburetor, the pieces of the disassembled carburetor must be reassembled in the right order.

After the carburetor is reassembled, it is ready for the primer seedling mount plate to be locked back into position.

6. Remount the carburetor.

Insert the two carburetor mount screws through the carburetor asphyxiate plate and the carburetor. Then entire associates can and so be fastened to the engine.

Then unabridged assembly tin then be attached to the engine.

Then the mount screws just need to be tightened down again. vii. Replace the air filter and air cleaner cover.

This primer bulb replacement is now complete. [Dorsum to top] Remote Primer Bulb Repair Steps
Many trimmer models mountain primer bulbs separately from the carburetor. Almost remote-mount primer seedling designs use a snap and ring organization similar the trimmer in our example.
The steps we explain in this example repair will aid with remote-mount bulb mount replacements on other engine designs. one. Clench the return fuel line.

Clamping the fuel line leading out of the primer bulb will prevent excess fuel leaking during the repair.

Nosotros utilize a pair of inexpensive hemostats, but any clamping tool that doesn't damage the fuel lines should do. 2. Remove the fuel lines from the old primer seedling with a screwdriver.

iii. Remove the old seedling by squeezing its mount tabs.

Well-nigh remote primer bulbs similar this one are fastened to some plastic tabs that in turn snap into a mount band.

To remove the old primer bulb from the mount ring, the tabs that concord it in identify must be squeezed while the bulb is pulled abroad from the ring.

A pair of needle nose pliers works all-time for this. 4. Install the new primer seedling.

The mountain tabs on the dorsum of the new primer bulb should snap correct into identify in the mountain band.

Sometimes the tabs can be a fiddling as well tight to snap in by hand. Attempt turning the engine (if possible) so that gravity is on your side, and then advisedly use a flat caput screwdriver to press the mountain tabs inside the mountain band.

5. Reinstall the fuel lines.

Printing the fuel lines onto the new primer seedling past hand, so unclamp the return line. This primer seedling replacement is now complete. [Dorsum to top] Decision
In only takes a few minutes to supercede a primer bulb, peculiarly subsequently you're used to your engine's primer mount pattern. After getting gas on your easily a few times through a cracked bulb, a small repair like this one can make yous feel like you take a whole new engine. Start your primer bulb repair past entering your tool's model number in the Search by Model Number field at the peak of the page. If your gas-powered tool is powered past an engine from a different manufacturer than the tool, visit our Small Engine Parts page to notice your machine's parts page. [Back to top] What we're most.

Source: https://www.ereplacementparts.com/repair-center/article/4262/How_to_Replace_a_Primer_Bulb.html

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