Model: WP6
Part Number: 13022346
Brands: Weichai Power
Engine Model: WP6, WP6G, WP6H
Engine Type: Diesel
Scope of application: light and medium trucks, buses, agricultural machinery, generator sets
A diesel piston takes combustion pressure at the crown, transfers heat through the rings and liner and must keep its ring grooves in shape while doing so. On the Weichai WP6, part 13022346 is the piston used in this mid-range family, with a cooling gallery fed by an oil jet under the crown.
The details that matter are invisible once assembled: bowl shape, groove width, pin bore clearance and skirt profile. A piston that is close but not correct will run and then fail through oil consumption, noise or a cracked crown.
The piston fits WP6, WP6G and WP6H engines in light and medium trucks, buses, tractors and small generator sets. Confirm the engine plate and the old piston number. Compression ratio and bowl shape changed between ratings, and pistons in one engine should come from the same weight class.
Pistons ship wrapped and protected. Complete assemblies with rings fitted are available on request.
Every failed piston carries evidence of the cause. A melted crown edge usually means over-fuelling or late injection. A cracked crown centre points to overheating or a blocked cooling jet. Scuffing on one side indicates a bent rod or misaligned bore, while scoring around the whole skirt suggests oil starvation.
Before fitting new pistons, check every cooling jet for flow and confirm the correct nozzle is installed. Some rebuilds end with the wrong jet, and the new piston overheats at the crown within a few thousand hours. Check the pin bore with the small end bush; if the pin rocks visibly, the piston is worn.
Clearance is measured at the skirt, at right angles to the pin, with the piston at room temperature. Too little clearance seizes the piston when hot; too much produces a rattle at cold start that fades as the engine warms. Both are avoidable by measuring rather than assuming the parts are matched.
Match the part number, the engine rating and the bowl shape. The same bore can carry pistons with different bowls for different emissions levels. Send a photo of the old piston crown alongside the engine plate and we will confirm the variant before shipping.
New pistons and rings need load to seat. Avoid long idling, vary engine speed and apply moderate load during the first hours. Then change oil and filter and check valve clearance after the engine cools. A gentle break-in that never loads the engine is as harmful as abuse, because the bores glaze.
Correct injection timing, clean fuel and adequate cooling keep pistons alive. Replace fuel filters at interval, keep the cooling jets clear and never run with a failed turbo passing oil into the intake. Fix overheating promptly, because crown temperature rises quickly when coolant flow drops.
The bowl in the piston crown shapes how fuel and air mix. Two pistons with the same diameter but different bowls will both fit the bore, but only one matches the injector spray pattern and the engine calibration. Fitting the wrong bowl produces smoke, poor fuel economy and higher exhaust temperature, and no amount of injector adjustment can correct the combustion chamber geometry.
Compare the old crown with the new one before assembly. The bowl depth and the position of the re-entrant lip are the quickest visual identifiers, and the part number stamped on the crown confirms it.
It is supplied bare by default. Complete assemblies are available on request.
Yes. Use pistons from the same weight class within one engine.
Yes, if the liner and the rest of the set are undamaged.
Over-fuelling, incorrect timing or a blocked cooling jet.
Browse the Weichai piston and components category, and pair the piston with the WP6 cylinder liner 13056682 or the WP6 connecting rod 12160519.
Weichai WP6 Piston (13022346). The piston receives combustion pressure directly and transfers it to the rod, while conducting heat out through the rings. The bowl profile shapes how fuel and air mix.
Confirm the piston number and the engine plate together. Pistons are specified by rating, so the engine model alone does not identify the right part.
Numbers beginning 1302 sit in the WP6 and early WP7 range. Fitment depends on the front-end arrangement rather than the nominal part type. On this engine, confirm the WP6 application against the engine plate before ordering.
Check piston-to-bore clearance and ring end gaps in the actual bore. Measuring in a spare liner gives a false reading and is a common cause of oil use after a rebuild.
Ordering note. For fleet customers, a consolidated stock list can be quoted against the engine plates in service, which usually exposes duplicated part numbers across similar units.
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: WP6, WP6G, WP6H, 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 |
Pistons ship wrapped and protected. Complete assemblies with rings fitted are available on request.
Every failed piston carries evidence of the cause. A melted crown edge usually means over-fuelling or late injection. A cracked crown centre points to overheating or a blocked cooling jet. Scuffing on one side indicates a bent rod or misaligned bore, while scoring around the whole skirt suggests oil starvation.
Before fitting new pistons, check every cooling jet for flow and confirm the correct nozzle is installed. Some rebuilds end with the wrong jet, and the new piston overheats at the crown within a few thousand hours. Check the pin bore with the small end bush; if the pin rocks visibly, the piston is worn.
Clearance is measured at the skirt, at right angles to the pin, with the piston at room temperature. Too little clearance seizes the piston when hot; too much produces a rattle at cold start that fades as the engine warms. Both are avoidable by measuring rather than assuming the parts are matched.
Match the part number, the engine rating and the bowl shape. The same bore can carry pistons with different bowls for different emissions levels. Send a photo of the old piston crown alongside the engine plate and we will confirm the variant before shipping.
New pistons and rings need load to seat. Avoid long idling, vary engine speed and apply moderate load during the first hours. Then change oil and filter and check valve clearance after the engine cools. A gentle break-in that never loads the engine is as harmful as abuse, because the bores glaze.
Correct injection timing, clean fuel and adequate cooling keep pistons alive. Replace fuel filters at interval, keep the cooling jets clear and never run with a failed turbo passing oil into the intake. Fix overheating promptly, because crown temperature rises quickly when coolant flow drops.
The bowl in the piston crown shapes how fuel and air mix. Two pistons with the same diameter but different bowls will both fit the bore, but only one matches the injector spray pattern and the engine calibration. Fitting the wrong bowl produces smoke, poor fuel economy and higher exhaust temperature, and no amount of injector adjustment can correct the combustion chamber geometry.
Compare the old crown with the new one before assembly. The bowl depth and the position of the re-entrant lip are the quickest visual identifiers, and the part number stamped on the crown confirms it.
Browse the Weichai piston and components category, and pair the piston with the WP6 cylinder liner 13056682 or the WP6 connecting rod 12160519.
It is supplied bare by default. Complete assemblies are available on request.
Yes. Use pistons from the same weight class within one engine.
Yes, if the liner and the rest of the set are undamaged.
Over-fuelling, incorrect timing or a blocked cooling jet.
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.
