ranroswang@hksparkling.com 
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Caterpillar 551-0841 Engine Cylinder Piston Kit with 524-5566 Pin & 6V-5589 Ring
The 551-0841 + 524-5566 + 6V-5589 Piston Kit is a premium heavy-duty engine overhaul kit designed for Caterpillar industrial diesel engines.
This piston is primarily designed for the C9.3 and C9.3B series engines.
· Excavators: 336, 336GC, 340, 345, 345GC, and 350.
· Wheel Loaders: 966 and 972.
· Other Applications: It is also used in dozers, industrial oil field engines, and marine engines.
Thank you for choosing SPARKLING MACHINERY.
The 551-0841 component group provides a complete top-end cylinder resolution for Caterpillar power plants operating under intense duty cycles. The piston assembly features an advanced structural profile designed to optimize fuel swirl patterns during the injection phase, promoting cleaner combustion and lowering emissions. When paired with the ultra-hard 524-5566 pin and the heavy-retension 6V-5589 snap rings, this kit prevents wrist-pin scoring and horizontal wrist-pin travel, ensuring stable linear motion at maximum RPMs.
The SPARKLING MACHINERY NEW 551-0841+524-5566+6V-5589 PISTON KIT Photo:
Why choose the SPARKLING NEW 551-0841+524-5566+6V-5589 Piston Kit?
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- Thermally Optimized Piston Structure: Manufactured using high-grade aluminum alloys or an articulated steel crown design to manage severe combustion temperatures without crown cracking or thermal distortion.
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- Precision-Honed Pin Bore: The piston pin bore is finished to micro-inch tolerances, ensuring a perfectly balanced oil film clearance with the 524-5566 wrist pin.
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- Induction-Hardened Wrist Pin: The pin is case-hardened and polished to eliminate friction wear and withstand extreme downward connecting rod forces.
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- High-Elasticity Retaining Rings: The 6V-5589 snap rings retain their spring tension permanently under extreme high-heat cycling, keeping the wrist pin perfectly centered.
FAQ
What are the primary warning signs that an engine's pistons and rings need to be replaced?
Common symptoms include excessive blue-gray smoke coming from the exhaust stack (indicating oil burning), a noticeable drop in engine power due to a loss of cylinder compression, heavy blow-by gas pressure venting out of the crankcase breather tube, and increased oil consumption.
Why is it critical to use a matched kit like the 551-0841 rather than mixing aftermarket brands?
Diesel engine cylinder tolerances are incredibly tight. Even microscopic weight or dimensional variations between a piston, pin, and retaining ring from different manufacturers can cause an engine imbalance, localized friction hot-spots, or snap-ring failure, which can lead to a broken rod throwing through the engine block.
What precaution should be taken when installing the 6V-5589 snap rings?
Never over-compress the snap rings during installation. Using the wrong tool or stretching the ring too far can permanently deform the steel, reducing its spring tension. Once installed in the piston groove, verify that the snap ring can spin smoothly in its slot and that the sharp, stamped edge faces outward to ensure a positive lock.
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📦 Packing
1. Packaging methods: Carton box + Wooden case/Pallet + Anti-rust treatment
2. Export-standard packaging to ensure safety during transportation
3. Custom packaging available upon request
4. Dimensions and weight can be provided for freight calculation
🚚 Shipping
1. Available shipping methods: Sea freight, Air freight, Express delivery (DHL, UPS, FedEx, etc.)
2. LCL (Less than Container Load) and FCL (Full Container Load) options are supported
3. For Russian clients, we can introduce the forwarder agent to you
4. Delivery time: Ships within 1-3 working days after payment (for items in stock)
💳 Payment
1. Accepted methods: T/T, Bank Transfer, PayPal, Alipay, WeChat Pay, Western Union
2. Deposit + balance payment available for large or custom orders
3. Flexible payment options—feel free to contact us for details
📌 Frequently Asked Questions (FAQs)
Q: Which excavator models is this part compatible with?
A: This product is compatible with major brands such as CAT, KOMATSU, HITACHI, and more. Custom specifications are also available.
Q: How can I make sure I’m selecting the correct part?
A: You can send us a photo of the old part, part number, or your excavator model, and we will help you confirm the right match.
Q: Is there a warranty for this product?
A: Yes, we offer a 6-month quality guarantee under normal use.
Get a free quote
We are committed to producing the highest quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
Contact us
Email: ranroswang@hksparkling.com
Wechat: +86 136 0901 0879
Skype: foreverlucia1
WhatsApp: +86 136 0901 0879
Address: No. 514-515, Hulin Road, Tianhe District, Guangzhou, China.
Sparkling Machinery Co.,Ltd
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Whatsapp: +8613609010879