Model: WP7 / WP8
Part Number: 610800030080
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
A diesel piston absorbs heat at the crown, transfers most of it through the rings and liner, and has to keep its ring grooves in shape while doing so. On the Weichai WP7 and WP8, part 610800030080 is the piston used in these ratings, 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 WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. Confirm the engine plate and the old piston number. Compression ratio and bowl shape changed between ratings, and the piston must match the injector and the engine calibration. Pistons in one engine should come from the same weight class to keep the crank balanced.
Pistons are produced to the original drawing and inspected at the points that control durability. Grooves are measured for width and flatness so rings cannot flutter. The cooling gallery is checked for flow, because a blocked gallery overheats the crown. The pin bore is measured for diameter and finish, since a loose bore makes a hollow knock at idle.
Pistons ship wrapped and protected. Complete assemblies with rings fitted are available if your workshop prefers to fit them as a unit.
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 a misaligned bore, while scoring around the whole skirt suggests oil starvation.
Read the evidence before ordering parts. Replacing a piston without fixing the cause produces the same failure again within a few thousand kilometres.
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 together with the small end bush; if the pin rocks visibly, the piston is worn.
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 has cooled. A gentle break-in that never loads the engine is as harmful as abuse, because the bores glaze and the rings never seal.
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.
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.
The skirt profile is cam ground so the piston stays round when hot. That is why a used piston can look worn only in patches, and why fitting a piston from another rating is risky even when the diameter matches. Always confirm the part number against the engine plate.
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 WP7 and WP8 piston ring set 1004744376 or the WP7 and WP8 cylinder liner 610800010503.
Weichai WP7 Piston (610800030080). Heat and pressure both arrive at this component first. The ring grooves control oil and compression, and the bowl decides how efficiently the fuel burns.
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 6108 belong to the WP7 and WP8 families. These engines share architecture but differ in detail, so a part that fits one will not necessarily suit the other without checking the casting. On this engine, confirm the WP7 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. 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: WP7, WP7H, WP8, WP8H, 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 are produced to the original drawing and inspected at the points that control durability. Grooves are measured for width and flatness so rings cannot flutter. The cooling gallery is checked for flow, because a blocked gallery overheats the crown. The pin bore is measured for diameter and finish, since a loose bore makes a hollow knock at idle.
Pistons ship wrapped and protected. Complete assemblies with rings fitted are available if your workshop prefers to fit them as a unit.
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 a misaligned bore, while scoring around the whole skirt suggests oil starvation.
Read the evidence before ordering parts. Replacing a piston without fixing the cause produces the same failure again within a few thousand kilometres.
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 together with the small end bush; if the pin rocks visibly, the piston is worn.
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 has cooled. A gentle break-in that never loads the engine is as harmful as abuse, because the bores glaze and the rings never seal.
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.
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.
The skirt profile is cam ground so the piston stays round when hot. That is why a used piston can look worn only in patches, and why fitting a piston from another rating is risky even when the diameter matches. Always confirm the part number against the engine plate.
Browse the Weichai piston and components category, and pair the piston with the WP7 and WP8 piston ring set 1004744376 or the WP7 and WP8 cylinder liner 610800010503.
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.
