Owner’s manual
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How much does it cost to replace a riding lawn mower engine?
For a Craftsman lawn tractor model 917273396, a full engine replacement typically costs $800 to $2,500 installed (engine plus labor). The total depends on the exact engine spec, whether you replace related wear items, and local shop labor rates; see the 917273396 owner's manual for model-specific service and safety guidance.
What drives the total cost
- Engine price: Most riding mower engines fall in the $500 to $1,800 range.
- Labor time: Commonly 4 to 8 hours for a riding lawn tractor engine swap.
- Extra parts and supplies: Oil, filter, fuel line, clamps, spark plug, and hardware.
- Deck and drive condition: A worn belt or blade system can add cost after the engine is in.
- Shop minimums and pickup/delivery: Some shops charge transport and diagnostic fees.
Typical cost breakdown (installed)
| Cost item | Typical range | Notes |
|---|---|---|
| Replacement engine | $500 to $1,800 | Varies by horsepower, shaft size, and charging system |
| Labor | $300 to $900 | Based on 4 to 8 hours and local rates |
| Fluids, tune-up items, misc. | $25 to $150 | Oil, filter, plug, fuel filter, clamps |
| Estimated total | $800 to $2,500 | Most common real-world range |
Before you replace the engine, check these common “no power” causes
Your manual’s troubleshooting chart points to issues that often feel like “bad engine” but are cheaper to fix:
- Dirty air filter
- Low or dirty engine oil
- Stale fuel or a clogged fuel filter
- Faulty spark plug or loose plug wire
- Grass and debris buildup under the deck (can overload the engine)
Why it matters
An engine replacement is one of the highest-cost repairs on a riding mower. Confirming basics like fuel, air, oil level, and debris buildup can restore power and prevent spending engine-level money on a tune-up-level problem.
Last updated: February 2026
What kind of engine does a Craftsman riding lawn mower have?
For Craftsman lawn tractor model 917273396, the owner’s manual identifies it as an 18.0 HP, low-emission, single-cylinder gasoline engine with electric start. For the exact engine make and model (such as Briggs & Stratton), we use the engine ID label and the specifications section in the 917273396 owner's manual.
How to identify the exact engine brand and model
We match the engine by the numbers on the engine itself, not just the tractor model number.
- Look for the engine model, type, and code stamped on the blower housing or valve cover area
- Check the emissions label on the engine shroud (often lists displacement and family)
- Compare the engine label info to the specifications and service info in the 917273396 owner's manual
- If the label is dirty, wipe it clean; use a flashlight to read stamped numbers
- Use the engine label details when ordering tune-up parts (spark plug, air filter, fuel filter)
What “18.0 HP” means on this model
Horsepower is a performance rating; what matters for parts and service is the engine’s exact identification.
| Item | What we use it for | Where to find it |
|---|---|---|
| Tractor model (917273396) | Deck, chassis, steering, belts, blades | Tractor ID tag, manual |
| Engine model/type/code | Engine parts and tune-up specs | Engine label/stamp |
| Deck size (42 in) | Blade and deck part matching | Manual and deck tag |
Why it matters
Many Craftsman riding mowers share similar frames and 42-inch decks, but they can ship with different engine variants over time. Using the engine label prevents ordering the wrong ignition, fuel, or air-intake parts.
Last updated: February 2026
Where can I find the Craftsman riding mower model number?
On your Craftsman riding mower, the model number is printed on the tractor’s identification label; for model 917273396, it’s also shown on the first page of the 917273396 owner's manual. Common label locations include under the seat, on the frame near the rear wheels, or near the engine.
Most common places to check on a riding mower
We typically find the model/serial label in one of these spots:
- Under the seat (lift the seat and look on the seat pan or frame)
- On either side of the frame near the rear wheels
- Under the rear guard area (back of the tractor)
- Near the engine compartment (frame rail or engine shroud area)
- On the mower deck housing (less common, but worth a quick look)
What the label usually looks like
The ID label is usually a sticker or metal tag with multiple fields. Look for:
- Model No. (this is the number you need for parts lookup)
- Serial No. (helps identify production run)
- Sometimes an engine model/type/code (engine parts use this, not the tractor model)
| What you’re looking for | Example | What it’s used for |
|---|---|---|
| Tractor model number | 917.273396 | Finding Craftsman tractor and deck parts |
| Tractor serial number | Varies | Verifying exact build details |
| Engine model/type/code | Varies | Ordering engine-specific parts |
Why it matters
Using the exact model number (like 917273396) prevents mismatched parts, especially for high-variation items such as mower deck blades, belts, mandrel assemblies, and steering components.
Last updated: February 2026
Is it worth replacing a lawn mower engine?
Yes, it’s worth replacing the engine on your Craftsman lawn tractor model 917273396 when the tractor’s deck, chassis, steering, and transmission are still solid and the total engine swap cost stays well below the cost of replacing the entire tractor. If the tractor has multiple major wear issues, replacing the tractor is the better value.
How we decide: repair vs replace
Use these checkpoints before you spend money on an engine:
- Overall condition: deck not rusted through, frame not cracked, steering tight, brakes working
- Total cost: engine (or short block) plus belts, blades, battery, and labor
- Time and tools: an engine swap is a real project, not a quick tune-up
- Parts availability: common wear parts are still easy to get for 917273396
- Safety systems: seat switch and interlocks must work correctly after the repair
For model-specific maintenance and safety checks (interlock operation, blade service, and general upkeep), follow the 917273396 owner's manual.
Cost rule of thumb (simple and reliable)
A practical way to decide is to compare the engine replacement total to the price of a comparable new riding mower.
| If your total engine swap cost is... | Best choice | Why |
|---|---|---|
| Under ~50% of a comparable new tractor | Replace engine | You keep a known-good chassis and save money |
| Around 50% to 70% | Depends on condition | Only worth it if everything else is strong |
| Over ~70% | Replace tractor | Better long-term value and less downtime |
What to inspect on a 917273396 before committing
These items often decide whether the tractor is “worth it”:
- Mower deck and spindles: vibration, noise, or wobble can point to mandrel wear
- Drive system: slipping, squealing, or poor ground speed can indicate belt or pulley issues
- Cut quality: uneven cut can be blade condition, deck leveling, or tire pressure
- Cooling and fuel system: debris buildup, dirty fuel filter, stale fuel, or overheating signs
If you’re already replacing worn cutting parts, a fresh set of blades can help you judge deck health after the engine work; examples for this model include the lawn tractor 42-in deck high-lift blade 532138971 and the husqvarna lawn tractor mulching blade, 21-in 532134149.
Why it matters
An engine swap only pays off when the rest of the tractor is dependable. A strong deck, good steering, and working safety interlocks mean you get years of service from the 917273396 without buying a whole new machine.
Last updated: February 2026
