Model: WP7 / WP8
Part Number: 1008699414
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
The WP7 and WP8 overhaul kits appear under several numbers, and 1008699414 is one of them alongside 1008699390 and 1008692403. The differences are concentrated in the piston and ring specification, tied to the compression ratio and the injector set used on a particular rating.
That is why the engine plate and, where available, the old piston crown are more useful than the model name alone. A kit from a different rating assembles without complaint and then produces smoke and poor economy, which nobody traces back to the kit.
This is a complete wearing-parts set. Every component normally replaced during a full overhaul is included, matched to the others rather than drawn from different suppliers.
The kit covers WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. These engines share a block architecture, so one kit family covers several ratings, but the pistons and rings are rating specific. Confirm the engine serial number before ordering.
A WP7 or WP8 signals its need for an overhaul through oil consumption and blow-by long before it loses power. Reading those signals early separates a planned rebuild from an emergency one.
The order of assembly matters as much as the parts. Clean the block, check flatness and set liner protrusion before any piston goes in, because those measurements decide whether the new gasket will hold.
Three details decide the fit: engine model, compression ratio and head casting. Send photographs of the engine plate and the old piston crown and our team will confirm the variant before the order ships, rather than after the parts have crossed an ocean.
Individual parts look cheaper when only one cylinder needs attention, but an engine that has worn one liner has usually worn all of them similarly. Mixing one new liner with the rest produces uneven compression, and the second rebuild follows within a year.
Have the measuring tools ready before the engine comes apart: bore gauge, dial indicator, plastigauge, calibrated torque wrench and a straight edge. A rebuild without measurements is guesswork. New head and rod bolts should be on site as well, because both are single-use fasteners.
Run at varying load after the rebuild, increasing gradually, and change oil early. Holding full load immediately glazes the bores and leaves the rings unseated, which is the most common reason a fresh engine burns oil.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed, use the specified oil grade and fix any leak immediately rather than topping up.
Overhaul kits change when a piston, ring or gasket specification changes. Two kits can look alike in the carton and differ only in the crown, and that difference shows up as smoke or poor economy once the engine runs. If there is any doubt about the generation, compare the old crown before assembly.
Kits are revised when a piston, ring or gasket specification changes, and the revision is not always obvious from the carton. Comparing the old piston crown with the new one, and the old head gasket with the new one, catches a mismatch before the engine is torn down.
The standard kit covers pistons, rings, liners and gaskets. Bearings are separate.
Yes, the gasket set includes the head gasket.
Only if the deck is flat and the bores are within specification.
Three to five working days for an experienced workshop.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP7 and WP8 overhaul kit 1008699390 or the WP7 and WP8 piston 610800030035.
Weichai WP7 Piston (1008699414). This piston carries the combustion load and forms half of the combustion chamber. Its crown profile is matched to the rating, not just to the bore diameter.
Compare the old piston crown with the new one. Two pistons can share a diameter and differ in bowl shape, compression height or groove width, and a wrong bowl produces smoke with no other symptom.
The part number is the reliable identifier here. Where the old number is unreadable, measure the component and compare it with the drawing rather than guessing from the engine model. On this engine, confirm the WP7 application against the engine plate before ordering.
Clean the ring grooves to bare metal before fitting new rings. Carbon at the bottom of a groove holds the ring proud and produces the same blow-by as a worn bore.
Ordering note. Packing is export grade: each unit is wrapped, boxed and palletised for sea freight, with the part number marked on the outside so the receiving store can book it in without opening the carton.
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 |
The kit covers WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders and generator sets. These engines share a block architecture, so one kit family covers several ratings, but the pistons and rings are rating specific. Confirm the engine serial number before ordering.
A WP7 or WP8 signals its need for an overhaul through oil consumption and blow-by long before it loses power. Reading those signals early separates a planned rebuild from an emergency one.
The order of assembly matters as much as the parts. Clean the block, check flatness and set liner protrusion before any piston goes in, because those measurements decide whether the new gasket will hold.
Three details decide the fit: engine model, compression ratio and head casting. Send photographs of the engine plate and the old piston crown and our team will confirm the variant before the order ships, rather than after the parts have crossed an ocean.
Individual parts look cheaper when only one cylinder needs attention, but an engine that has worn one liner has usually worn all of them similarly. Mixing one new liner with the rest produces uneven compression, and the second rebuild follows within a year.
Have the measuring tools ready before the engine comes apart: bore gauge, dial indicator, plastigauge, calibrated torque wrench and a straight edge. A rebuild without measurements is guesswork. New head and rod bolts should be on site as well, because both are single-use fasteners.
Run at varying load after the rebuild, increasing gradually, and change oil early. Holding full load immediately glazes the bores and leaves the rings unseated, which is the most common reason a fresh engine burns oil.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed, use the specified oil grade and fix any leak immediately rather than topping up.
Overhaul kits change when a piston, ring or gasket specification changes. Two kits can look alike in the carton and differ only in the crown, and that difference shows up as smoke or poor economy once the engine runs. If there is any doubt about the generation, compare the old crown before assembly.
Kits are revised when a piston, ring or gasket specification changes, and the revision is not always obvious from the carton. Comparing the old piston crown with the new one, and the old head gasket with the new one, catches a mismatch before the engine is torn down.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP7 and WP8 overhaul kit 1008699390 or the WP7 and WP8 piston 610800030035.
The standard kit covers pistons, rings, liners and gaskets. Bearings are separate.
Yes, the gasket set includes the head gasket.
Only if the deck is flat and the bores are within specification.
Three to five working days for an experienced workshop.
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.
