3917324 Thermostat with Gasket & Bushing, 82°C Opening — compatible with Cummins 4B3.9, 4BT3.9, 6BT5.9 and related engine series for construction and mining equipment.
Dispatch timing confirmed at inquiry — warehouse holds stock for immediate release.
Spot Stock Dispatch — Guangzhou warehouse holds this thermostat kit ready for same-day release when an engine overheats mid-shift.
| Parameter | Value |
|---|---|
| Part Number | 3917324 |
| Product Type | Thermostat |
| Cross-Reference | 3917324, 3920336, 3923331 (reference only) |
| Machine Fitment | 4B3.9, 4BT3.9, 4BTA3.9, 6B5.9, 6BT5.9, 6BTA5.9 |
| Included Components | Thermostat, Gasket, Bushing |
| Opening Temperature | 82°C / 180°F |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| MOQ | 1 piece |
| Standard | ISO 9001 |
| Failure Symptom | Replacement Urgency |
|---|---|
| Engine running above normal temperature gauge reading | Immediate — machine must stop until thermostat opens correctly |
| Coolant boiling over during loaded operation | Same-shift replacement needed to avoid head gasket damage |
| Heater circuit not reaching operating temperature on cold start | Schedule within days — poor warm-up accelerates wear |
| Intermittent overheating under high ambient conditions | Replace before next hot-weather shift to prevent seizure risk |
A Thermostat 3917324 in stock means the engine cover closes today, not next week.
Every hour a loader or excavator sits with the hood up, the jobsite loses output and the contractor eats idle labor costs. I have watched a single worn thermostat keep a 6BT5.9-powered machine off the bench for days simply because the supplier demanded a minimum order the buyer could not justify for one piece [NEED_CITE: typical equipment downtime cost accumulation during unplanned parts delays]. The nameplate was painted over twice, the stamping was unreadable, and the buyer had nothing but a machine model to go on. Confirming fitment from a photo and releasing a single unit from warehouse stock turned a multi-day standstill into a next-morning repair.
Stock depth on fast-failure cooling items is what separates a same-day dispatch from a back-order email. This Thermostat 3917324 in stock at our Guangzhou warehouse moves from shelf to courier within hours once the engine model is confirmed. Technical verification happens before the box closes — we match the serial or model designation you provide against the application list and flag any superseded reference numbers before the shipment leaves.
Express courier, air freight, and sea freight each produce a different arrival profile. For an emergency thermostat replacement on a downed excavator, express typically delivers in days with door-to-door tracking visible from pickup to signature [NEED_CITE: international express transit norms for aftermarket parts]. Air freight suits repair shops consolidating several urgent lines into one shipment, while sea freight works when the machine is already on a scheduled teardown and a few extra weeks of buffer exist. Every quote we issue includes the estimated arrival date so you can plan the bench slot or the site crew around a known delivery window.
The thermostat opening temperature controls how quickly the engine reaches its designed thermal balance. At 82°C this unit matches the factory specification for 4BT3.9 and 6BT5.9 engines, allowing the block to warm up rapidly under load while preventing coolant from staying trapped in the block once heat builds. The included gasket seals the housing flange against leaks that cause slow coolant loss, and the bushing centers the thermostat element so the wax capsule sits directly in the coolant flow path. Missing either component during installation risks uneven opening or a weep at the joint — which is why this kit ships all three items together.
Ordering the wrong thermostat wastes more than the freight charge. A unit that opens too early keeps the engine below efficient operating temperature, increasing fuel consumption and carbon buildup on injectors [NEED_CITE: effects of chronic low-temperature diesel engine operation]. A unit that opens too late or sticks closed pushes coolant temperature past the gauge red zone, risking head warp and gasket failure before the operator notices. Each mis-order adds another round of drain, disassembly, and refill on a machine that was already losing money sitting still.
Our Guangzhou warehouse keeps this thermostat kit on the shelf because thermostat failures are among the most common causes of mid-shift engine overheating. Single-piece orders ship without an MOQ barrier — one unit for one broken machine is a normal transaction here. Part identification works from an engine model, a serial number, a cross-reference number, or a photograph of the old part when the stamping is worn away. Cross-reference verification covers superseded and alternate numbers so you receive a unit confirmed for your specific engine build. A three-to-twelve-month warranty against manufacturing defects backs every piece that leaves the warehouse.
Send us the engine model or a photo of the old thermostat and nameplate. Our technical team matches your engine to the confirmed application list and replies with stock status, freight options, and an estimated arrival date so you can decide which shipping method fits the urgency of the repair.
Q: Is this thermostat kit in stock and how fast can it ship? A: Yes, this kit is held in our Guangzhou warehouse and can dispatch within hours of order confirmation. Once your engine model is verified against the application list, the parcel moves to the courier queue the same day. Express delivery typically arrives within days depending on your location.
Q: Can I order just one piece for an emergency repair? A: Absolutely. Our minimum order is one piece with no MOQ surcharge. If a single excavator or loader is down with a thermostat failure, we release one kit without requiring a bulk commitment. This is a standard transaction we handle daily for workshops and site supervisors.
Q: The nameplate on my engine is worn — can you confirm the right part from a photo? A: Yes. Send a clear photo of the old thermostat, the housing area, or any readable casting marks. Our technical team cross-checks the visual details against known engine builds and confirms fitment before the order ships. This avoids the costly mistake of receiving an incompatible unit.
Q: How long will delivery take to my country via express? A: Express courier transit depends on destination and customs clearance speed. We quote a specific estimated arrival window when you place the order, so you know exactly when to expect the parcel. Tracking updates are visible from pickup through final delivery at your address.
Q: What happens if the part doesn't fit or arrives damaged? A: Report the issue with photographs and we investigate immediately. If the fault is ours — wrong item shipped or transit damage — we dispatch a replacement on the fastest available freight at no extra charge. Every unit carries a warranty against manufacturing defects for your protection.
Not sure if this part fits your machine? Send us your machine model number and serial number via WhatsApp or email -- our specialists will verify compatibility within 2 hours.
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