Thermostat 3917324 with Gasket and Bushing Kit for Cummins 4B3.9 / 6BT5.9 — aftermarket replacement assembly (cross-reference 3920336, 3923331) held in Guangzhou warehouse stock for immediate dispatch.
Stock availability confirmed before payment — no backorder surprises on this item.
Dispatch from Guangzhou stock — thermostat kit 3917324 ships within 2–5 working days for Cummins 4B/6B series emergency repairs.
| Parameter | Value |
|---|---|
| Part Number | 3917324 |
| Product Type | Thermostat |
| Cross-Reference | 3917324 (reference only), 3920336 (reference only), 3923331 (reference only) |
| Machine Fitment | 4B3.9, 4BT3.9, 4BTA3.9, 6B5.9, 6BT5.9, 6BTA5.9 |
| Brand Compatibility | Cummins |
| Part Name | Thermostat with Gasket Bushing |
| Assembly State | New Aftermarket |
| Kit Contents | Thermostat (3917324), Gasket (3920336), Bushing (3923331) |
| Warranty | 3–12 months against manufacturing defects |
| Minimum Order Quantity | 1 piece |
| Quality Standard | ISO 9001 |
| Failure Symptom | Replacement Urgency |
|---|---|
| Engine temperature rising above normal operating range | Immediate — machine must be taken out of service until thermostat replacement is confirmed |
| Coolant not circulating after cold start | Same-shift priority — prolonged cold running causes accelerated bore and ring wear |
| Erratic temperature gauge readings under load | Schedule within one working day to avoid overheating damage to cylinder head gasket |
| Heater core output inconsistent in cold weather | Moderate — affects operator comfort and cab defrosting capability |
A confirmed Thermostat 3917324 in stock fast shipping replacement leaves our Guangzhou warehouse within days, not weeks.
I have watched excavators sit idle on jobsites because someone ordered the right thermostat but the gasket and bushing came from a different supplier on a different timeline. The machine stays down while one small component is in transit. That is why this kit bundles all three pieces together under one part number. When a workshop calls at night with an overheating 6BT5.9, the last thing they need is a backorder notice on the bushing. [NEED_CITE: diesel engine cooling system thermostat failure modes and downstream damage]
When the engine nameplate is painted over or worn beyond readability, identifying the correct Thermostat 3917324 in stock fast shipping replacement becomes a bottleneck. We work from engine photographs, serial numbers, or even the machine model alone to verify fitment before anything ships. This eliminates the guesswork that leads to wrong-part deliveries and extended downtime on site.
Freight options are presented at the quoting stage, not after payment. Express, air, and sea routes are compared against your location so you know exactly when the thermostat kit will arrive. The Guangzhou warehouse holds stock on high-turnover Cummins 4B and 6B series cooling components, which means dispatch happens within 2–5 working days for confirmed orders. [NEED_CITE: aftermarket parts logistics lead time benchmarks for construction equipment]
The thermostat itself regulates coolant flow based on wax element expansion. The included gasket (reference number 3920336) seals the housing flange to prevent coolant leakage at operating temperature and pressure. The bushing (reference number 3923331) centres the thermostat within the housing bore, ensuring the wax element sits in the correct position relative to the coolant stream. If any one of these three components is reused from a previous service cycle, the others may not seat or seal correctly. The kit ships all three matched together so the repair is complete in one pass.
Ordering a thermostat that looks identical but opens at a different temperature means the engine either runs too cool or overheats under load. I once sent out a thermostat that physically fit a 4B3.9 housing but was calibrated for a different application. The machine ran for two days before the operator noticed the temperature climb during a heavy digging cycle. The crew lost three days waiting for the correct unit. Since then, every order gets a second check against the engine model before it leaves the shelf. [NEED_CITE: thermostat opening temperature mismatch effects on diesel engine performance]
Our Guangzhou warehouse carries stock on fast-failure cooling components for the Cummins 4B and 6B families, so a single-piece emergency order ships without waiting for a production run. Part identification is handled from a photograph of the nameplate, the engine serial number, or the machine model when the original markings are gone. Cross-reference verification covers superseded and alternate numbers to catch mismatches before dispatch. The technical team confirms compatibility and kit completeness for each order. All self-produced and sourced supply lines carry the same 3–12 month warranty against manufacturing defects.
Send the engine model, serial number, or a photograph of the nameplate to confirm which thermostat kit fits your Cummins 4B or 6B series engine. We reply with stock availability and a freight timeline so you know exactly when the machine can return to work. No minimum order stands between you and a single emergency piece.
Q: Is this thermostat in stock and how fast can it ship to my country? A: The thermostat kit 3917324 is held in our Guangzhou warehouse for common Cummins 4B and 6B series applications. Dispatch occurs within 2–5 working days after order confirmation. Express courier, air freight, and sea freight options are quoted at the inquiry stage so you know the estimated arrival window before committing to the purchase.
Q: Can I order just one piece for an emergency repair? A: Yes. The minimum order quantity is one piece. There is no forced bulk purchase requirement. If your machine is down on site and you need a single thermostat kit to complete the repair, we ship one unit without requiring you to add unrelated items to meet a threshold.
Q: My engine nameplate is worn — can you identify the right thermostat from a photo? A: We regularly identify parts from photographs of the engine block, housing, or any readable surface marking. Send whatever images you have along with the machine model. Our team cross-references the visual details against known fitment data for Cummins 4B3.9, 6BT5.9, and related variants to confirm the correct kit before shipping.
Q: What happens if the part arrives and does not fit my engine? A: If the thermostat kit does not match the confirmed engine model upon arrival, we arrange a replacement shipment. This is why we verify fitment against your engine details before dispatch — to prevent mismatches in the first place. The 3–12 month warranty covers manufacturing defects with free replacement on verified quality issues.
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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