Model: WP9
Part Number: 611600030017
Brands: Weichai Power
Engine Model: WP9, WP9H, WP9G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction machinery, generator sets
The connecting rod reverses load twice per revolution. It is pulled in tension by piston inertia, pushed in compression by combustion and bent sideways as the crank swings. On the Weichai WP9, part 611600030017 is the forged rod used across the 9-litre family, fitted with a small end bush for the piston pin and bearing shells at the big end.
Because the load reverses, fatigue failures begin at the transition from the shank to the big end, which is why rods are shot peened and why the cap must stay with its original rod. Each pair is machined together and cannot be swapped without losing bore alignment.
The rod fits WP9, WP9H and WP9G engines in heavy trucks, buses, loaders, excavators and generator sets. These engines often run at sustained load, so rod condition matters more than on a delivery vehicle. Confirm the engine plate and the old rod number: rods from different ratings can share a length but differ in weight and small end diameter.
Rods are forged from alloy steel with controlled grain flow, shot peened and then machined. The big end bore and small end bush are finished to specification, and rods are weight matched within a set so the engine stays balanced at rated speed.
Rods ship with the small end bush fitted and new rod bolts where the design uses stretch bolts.
A rod problem announces itself as noise. A deep knock that increases with load and speeds up with rpm is the classic sign of a worn big end bearing, and by that stage the rod is usually already damaged.
Once a bearing spins, the rod is generally destroyed as well, and continuing to run risks the rod breaking the block.
Match the part number, the engine rating and the piston pin diameter. A rod from a different rating may be the wrong weight, which shows up as vibration at speed and early main bearing wear. Check the numbers stamped on the existing rods if the engine has been rebuilt before.
The rod bearing is where most failures begin. Shells come in standard and undersize grades and the grade must match the journal after any regrind. Always check clearance with plastigauge rather than assuming, because one undersize journal is easy to miss. Rod bolts are stretch bolts and must be replaced every time a rod is opened.
Detonation hammers the piston and rod on every cycle, squeezing the oil film out of the big end bearing until the shell fatigues. Engines that have run with a faulty injector, low fuel pressure or excessive boost often show rod bearing damage with no obvious wear elsewhere. If a rod has failed without an oil-related cause, check the injection system and boost control before rebuilding.
Rods are packed in a rigid carton with the big end protected and caps wired to their rods so they cannot be mixed in transit. If the shipment includes pistons, tell us so the rods can travel in the same carton and share freight.
Rod life depends on oil pressure and on avoiding detonation. Use the specified oil, change it at the severe-duty interval and never run with a leaking injector that dilutes the oil. Diagnose excessive smoke or power loss promptly rather than waiting for the next service interval.
New rod bolts are supplied where the design uses stretch bolts. They must not be reused.
Yes, if the crank and other rods are undamaged. Match the weight class.
Mount on a surface plate with pins in both ends and measure with a dial gauge.
Low oil pressure, contaminated oil or detonation. Fix the cause before fitting new parts.
Browse the Weichai piston and components category, and pair the rod with the WP9 cylinder head 1001677070 or the WP9 crankshaft 1000408941.
Weichai WP9 Connecting Rod (611600030017). The connecting rod transfers the firing impulse from the piston to the crankshaft. Its big end carries the highest alternating load of any bearing in the engine.
Confirm the rod is weight matched to the set if you are replacing fewer than six. Mismatched rods produce vibration that is often traced to the crankshaft instead.
Numbers beginning 6116 are used on the WP9 and later WD615 variants. The prefix alone does not pin the revision down; the engine plate and the old part number together do. On this engine, confirm the WP9 application against the engine plate before ordering.
Use new rod bolts. A stretched bolt loses clamping load and the cap frets under load, which destroys the bearing and then the journal in quick succession.
Ordering note. Warranty is twelve months against manufacturing defects. Failures caused by incorrect clearance, overheating or debris are assessed on the returned part rather than refused outright.
Related reading: Piston Ring Selection: Gap, Tension and Bore Condition
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WP9, WP9H, WP9G, and other Weichai series. |
| Shipping | By sea / air / express (DHL, FEDEX, TNT, UPS, EMS) |
| Packing | Standard exporting packing or as required |
| Payment Term | L/C, T/T, Western Union, Trade Assurance |
| Delivery Time | 3-7 days (depend on order) |
| Selling Point | 1. On-time Delivery 2. Genuine Quality Assurance 3. Professional Supplier |
Rods are forged from alloy steel with controlled grain flow, shot peened and then machined. The big end bore and small end bush are finished to specification, and rods are weight matched within a set so the engine stays balanced at rated speed.
Rods ship with the small end bush fitted and new rod bolts where the design uses stretch bolts.
A rod problem announces itself as noise. A deep knock that increases with load and speeds up with rpm is the classic sign of a worn big end bearing, and by that stage the rod is usually already damaged.
Once a bearing spins, the rod is generally destroyed as well, and continuing to run risks the rod breaking the block.
Match the part number, the engine rating and the piston pin diameter. A rod from a different rating may be the wrong weight, which shows up as vibration at speed and early main bearing wear. Check the numbers stamped on the existing rods if the engine has been rebuilt before.
The rod bearing is where most failures begin. Shells come in standard and undersize grades and the grade must match the journal after any regrind. Always check clearance with plastigauge rather than assuming, because one undersize journal is easy to miss. Rod bolts are stretch bolts and must be replaced every time a rod is opened.
Detonation hammers the piston and rod on every cycle, squeezing the oil film out of the big end bearing until the shell fatigues. Engines that have run with a faulty injector, low fuel pressure or excessive boost often show rod bearing damage with no obvious wear elsewhere. If a rod has failed without an oil-related cause, check the injection system and boost control before rebuilding.
Rods are packed in a rigid carton with the big end protected and caps wired to their rods so they cannot be mixed in transit. If the shipment includes pistons, tell us so the rods can travel in the same carton and share freight.
Rod life depends on oil pressure and on avoiding detonation. Use the specified oil, change it at the severe-duty interval and never run with a leaking injector that dilutes the oil. Diagnose excessive smoke or power loss promptly rather than waiting for the next service interval.
Browse the Weichai piston and components category, and pair the rod with the WP9 cylinder head 1001677070 or the WP9 crankshaft 1000408941.
New rod bolts are supplied where the design uses stretch bolts. They must not be reused.
Yes, if the crank and other rods are undamaged. Match the weight class.
Mount on a surface plate with pins in both ends and measure with a dial gauge.
Low oil pressure, contaminated oil or detonation. Fix the cause before fitting new parts.
EPID supplies diesel engine parts for Weichai, Baudouin, Yuchai, Caterpillar, Sinotruk, FAW Xichai and Cummins engines. Every order is checked against the original part number before packing, and our team can identify a part from a photo of the engine plate. Ask for a quotation with your model and quantity and we will reply within one working day.
