Model: WP7 / WP8
Part Number: 610800030035
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 has to take combustion pressure at the crown, transfer heat into the rings and liner, and stay dimensionally stable while doing it. On the Weichai WP7 and WP8, part 610800030035 is the piston used in these ratings, with a cooling gallery that receives oil from a jet under the crown.
The details that matter are invisible once the engine is assembled: crown bowl shape, ring 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 some ratings, and the piston must match the injector and the engine calibration. Piston weight also matters: pistons in one engine should come from the same weight class to keep the crankshaft balanced.
Pistons are produced to the original drawing and inspected at the points that control durability. The ring 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 produces 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 and replacement is the only reliable repair.
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 us 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: crown temperature rises quickly when coolant flow drops, and a piston that has been hot is permanently weakened.
It is supplied bare by default. Complete assemblies with rings fitted 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. Check ring gaps in the actual bore.
Over-fuelling, incorrect timing or a blocked cooling jet. Diagnose before rebuilding.
Browse the Weichai piston and components category, and pair the piston with the WP7 and WP8 cylinder liner 610800010503 or the WP7 and WP8 connecting rod 610800030073.
We offer OEM quality and excellent after-sales service as a complementary option. Engine brands supported include Weichai, Baudouin, Yuchai, Caterpillar, FAW Xichai, Sinotruk, Cummins and other engine parts. Specifically engine overhaul kits, pistons, cylinder liners, crankshafts, camshafts, fuel pumps, water pumps, lube pumps, injectors, and other performance parts.
If you are not sure about the part number that you need, please provide all the information you have, such as the equipment nameplate, engine nameplate or engine number, or real photos.
A diesel piston has to take combustion pressure at the crown, transfer heat into the rings and liner, and stay dimensionally stable while doing it. On the Weichai WP7 and WP8, part 610800030035 is the piston used in these ratings, with a cooling gallery that receives oil from a jet under the crown.
The details that matter are invisible once the engine is assembled: crown bowl shape, ring 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 some ratings, and the piston must match the injector and the engine calibration. Piston weight also matters: pistons in one engine should come from the same weight class to keep the crankshaft balanced.
| 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. The ring 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 produces 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 and replacement is the only reliable repair.
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 us 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: crown temperature rises quickly when coolant flow drops, and a piston that has been hot is permanently weakened.
Browse the Weichai piston and components category, and pair the piston with the WP7 and WP8 cylinder liner 610800010503 or the WP7 and WP8 connecting rod 610800030073.
It is supplied bare by default. Complete assemblies with rings fitted 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. Check ring gaps in the actual bore.
Over-fuelling, incorrect timing or a blocked cooling jet. Diagnose before rebuilding.
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.
