Craftsman 143004008 engine Parts

Craftsman lawnmower engines are made by multiple engine manufacturers, depending on the mower and production run. For the Craftsman engine model 143004008, the model number format is commonly associated with Tecumseh-built engines, and you can match the exact engine components using the parts list for this model or by searching 143004008 on Sears PartsDirect.

What you can expect by brand

Craftsman is a brand name used across many mower and outdoor power products, so the engine supplier varies. Common engine makers you will see on Craftsman lawn equipment include:

• Briggs & Stratton
• Kohler
• Kawasaki
• Tecumseh (common on older Craftsman engine model numbers like 143xxxxx)
• Other OEM suppliers on select models

How to confirm who made your specific engine

The most reliable way is to identify the engine manufacturer from the engine’s ID tag and then match parts by the engine model number.

• Find the engine model/spec numbers stamped on the blower housing, valve cover, or recoil starter area
• Compare the full engine model number (for example, 143004008) to the parts listing
• Match carburetor and ignition parts by exact part ID to avoid ordering the wrong revision
• If the mower has a separate mower model number, use the engine model number for engine parts

Parts that help you “fingerprint” the engine

If you are already working on fuel or ignition issues, these common service parts for 143004008 can help confirm you are in the right parts breakdown:

System	Common part on this model	What it relates to
Carburetor	Needle seat 631021B	Fuel metering and flooding issues
Starting/fuel	Craftsman lawn & garden equipment engine carburetor primer bulb (red) 640259	Priming and cold starts
Ignition	Ignition module 34443D	Spark generation and no-start symptoms

Why it matters

Engine makers use different carburetors, ignition coils, gaskets, and fuel line routing. Identifying the correct engine manufacturer (and using the exact engine model number) prevents mismatched parts and repeat repairs.

Last updated: February 2026

To tell what year your Craftsman mower is, we use the model and serial number tag on the mower (not the engine model 143004008). On many Craftsman riding mowers, the serial number includes a date code where the last two digits indicate the year it was built.

Where to find the model and serial number tag

Check these common locations first:

• Riding mower: under the seat, on the seat pan, or on the rear fender area
• Walk-behind mower: on the rear deck, near the wheels, or by the engine mounting area
• Zero-turn: on the frame rail near the seat or on the left or right side of the chassis
• Sometimes: inside the battery compartment or under a removable cover

How to decode the year from the serial number

Many Craftsman serial numbers use a date-style code. A common format is MMDDYY at the start of the serial number.

• First 2 digits: month (MM)
• Next 2 digits: day (DD)
• Last 2 digits: year (YY)

Example:

Serial code	Month	Day	Year
071294	07	12	1994

Some walk-behind mowers use a different pattern (often a longer string where one digit indicates the year). When the code is not obvious, the safest approach is to match the mower model number to parts diagrams and product listings.

Why the engine model number is not the mower year

Your Craftsman engine model 143004008 identifies the engine family and configuration; it does not reliably identify the mower’s build year because the same engine model can be used across multiple mower models and production runs.

If the tag is missing or unreadable

Use these practical checks to narrow it down:

• Look for a second ID label on the mower frame (separate from the engine)
• Compare your mower’s configuration to the parts list for your mower model
• If you are already doing a tune-up, replacing fuel system parts can help confirm what you have installed (for example, a matching primer bulb style or carburetor parts)

If you need parts while you identify the mower, you can order engine-related items for model 143004008 from the parts list, or search by the mower model on Sears PartsDirect.

Last updated: February 2026

A typical lawn mower engine like the Craftsman 143004008 is built around fuel delivery, air intake, ignition, and internal moving parts that convert combustion into shaft power. Common components include the carburetor, air filter, ignition module, flywheel, crankcase, and starter system.

Main engine systems and what they do

• Fuel system: stores and delivers fuel to the carburetor (tank, fuel line, primer bulb, float bowl, needle and seat)
• Air intake: filters air and seals the intake path (air filter parts and gaskets)
• Ignition system: creates spark at the right time (ignition module, spark plug)
• Starting system: spins the engine to start (recoil starter and starter housing)
• Exhaust system: routes exhaust away and reduces noise (muffler, spark arrestor)
• Engine internals: make power (piston, rings, camshaft, crankcase)

Common parts you may replace on model 143004008

These are some frequently serviced items we see on this Craftsman engine:

• Fuel delivery and carburetor sealing: needle seat 631021B, carburetor primer bulb (red) 640259, carburetor gasket 26756
• Carburetor service parts: carburetor float bowl 631867, carburetor rebuild kit 632760B, carburetor o-ring 632547
• Ignition and timing-related: ignition module 34443D, engine flywheel 611213
• Air and crankcase sealing: air filter collar gasket 34338, engine intake gasket 36786

Quick “system to part” map

Engine area	What it affects	Example part on this model
Fuel delivery	Hard starting, surging, flooding	Needle seat 631021B
Priming	Starts only with repeated priming	Carburetor primer bulb (red) 640259
Ignition	No spark, intermittent spark	Ignition module 34443D
Exhaust	Power loss, overheating, noise	Engine muffler 36790A

Why it matters

Knowing the major engine parts helps you troubleshoot faster. For example, a “starts then dies” complaint often points to the fuel system (primer bulb, carburetor gasket, needle and seat), while a “no-start, no spark” symptom points to the ignition module.

Ordering the right parts

We recommend matching parts to the Craftsman 143004008 parts list first; for additional model-based searches and ordering options, use Sears PartsDirect.

Last updated: February 2026