Model: WP7 / WP8
Part Number: 1008699390
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
Rebuilding a diesel from individually ordered parts means matching pistons to liners, rings to pistons and gaskets to the exact head casting. Every mismatch is a potential oil burner or a leak. Kit 1008699390 removes that risk by grouping the parts that wear together.
For export customers the kit also solves a logistics problem: one part number, one shipment and one customs entry instead of eight separate purchases where a single delay holds the whole rebuild.
This is a complete wearing-parts set, not a partial collection. Every component normally replaced during a full overhaul is included.
The kit covers WP7, WP7H, WP8 and WP8H engines in trucks, buses, loaders, excavators and generator sets. These engines share a common block architecture, so one kit group serves several ratings, but the pistons and rings are matched to the specific rating.
Confirm the engine serial number when ordering. Engines rebuilt before may already carry a later head or a different piston batch, and the kit should match what is actually fitted rather than what the service book says.
A WP7 or WP8 usually 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. A kit from a different rating will physically assemble but produce the wrong compression ratio. Send photographs of the engine plate and the old piston crown and our team will confirm the variant.
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.
Write down the kit number, the clearances measured and the oil analysis results in the engine log. When the next overhaul comes, the records show what wore and how fast, which is far more useful than a generic service interval from a manual.
Overhaul kits change when a piston, ring or gasket specification changes. Two kits can look alike in the carton and differ only in the piston crown, and that difference shows up as smoke or poor economy once the engine runs. Compare the old crown with the new one before assembly if there is any doubt about the generation.
If the engine has already been rebuilt, the bores may be oversize and the kit must match. Measure the bore at three heights and two directions, and measure the old piston diameter at the skirt. Those figures decide whether a standard or oversize kit is required, and they cost nothing to take.
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 piston 610800030035 or the WP7 and WP8 cylinder liner 610800010503.
Weichai WP7 Piston (1008699390). 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.
Check the ring groove width with the old ring and a feeler gauge. An opened groove lets the new ring flutter, and a fluttering ring breaks.
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. Every shipment leaves with a packing list matched to the invoice, which matters when a rebuild is waiting on one seal and the whole pallet has to be cleared through customs.
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, excavators and generator sets. These engines share a common block architecture, so one kit group serves several ratings, but the pistons and rings are matched to the specific rating.
Confirm the engine serial number when ordering. Engines rebuilt before may already carry a later head or a different piston batch, and the kit should match what is actually fitted rather than what the service book says.
A WP7 or WP8 usually 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. A kit from a different rating will physically assemble but produce the wrong compression ratio. Send photographs of the engine plate and the old piston crown and our team will confirm the variant.
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.
Write down the kit number, the clearances measured and the oil analysis results in the engine log. When the next overhaul comes, the records show what wore and how fast, which is far more useful than a generic service interval from a manual.
Overhaul kits change when a piston, ring or gasket specification changes. Two kits can look alike in the carton and differ only in the piston crown, and that difference shows up as smoke or poor economy once the engine runs. Compare the old crown with the new one before assembly if there is any doubt about the generation.
If the engine has already been rebuilt, the bores may be oversize and the kit must match. Measure the bore at three heights and two directions, and measure the old piston diameter at the skirt. Those figures decide whether a standard or oversize kit is required, and they cost nothing to take.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP7 and WP8 piston 610800030035 or the WP7 and WP8 cylinder liner 610800010503.
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.
