Model: WP7 / WP8
Part Number: 1008692403
Brands: Weichai Power
Engine Model: WP7, WP7H, WP8, WP8H
Engine Type: Diesel
Scope of application: medium and heavy trucks, buses, construction machinery, generator sets
Weichai lists several overhaul kits for this engine family, and 1008692403 is one of them. The kits differ mainly in piston and ring specification, which follows the compression ratio and injector set of a particular rating rather than the block itself.
A kit from the wrong rating fits and runs, then smokes and burns fuel. The mistake is easy to make because the carton looks identical. Comparing the old piston crown with the new one before assembly is the quickest check, and the engine plate confirms it.
This is a complete wearing-parts set, not a partial collection. Everything normally replaced during a full overhaul is included and matched together.
A rebuild is justified when the wear is general rather than local. Oil consumption, blow-by and low hot-idle pressure together indicate that rings, liners and bearings have all reached the end of their life at roughly the same time.
The order of assembly matters as much as the parts. Clean the block, check flatness and set liner protrusion before any piston goes in.
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 shipping.
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 the 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.
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.
Run at varying load, increasing gradually, and change oil early. Holding full load immediately glazes the bores and leaves the rings unseated.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and fix any leak immediately rather than topping up.
Kits cover the wearing parts, but bearings, head bolts and rod bolts are ordered separately because they depend on the crankshaft size and on the engine's condition. Plan the whole order together; a kit waiting for a set of main bearings holds the rebuild just as effectively as a missing piston.
The piston is the part that changed between generations, because compression ratio and bowl design were revised alongside the injectors. Comparing the old crown with the new one before assembly catches a mismatch in minutes.
Bearings depend on the crankshaft size and stretch bolts on the head and rod design, so both are ordered separately. Plan them in the same order so the rebuild is not held up by a part that costs little but arrives late.
Write down the kit number, clearances and oil analysis results in the engine log. The next overhaul then starts with data rather than guesswork, and any warranty discussion is easier with figures on file.
Compare the old piston crown and engine plate, or send us photos.
No, bearings are ordered separately.
Yes, the gasket set includes the head gasket.
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 1008699414 or the WP7 and WP8 cylinder liner 610800010503.
Weichai WP7 Piston (1008692403). 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.
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.
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 |
A rebuild is justified when the wear is general rather than local. Oil consumption, blow-by and low hot-idle pressure together indicate that rings, liners and bearings have all reached the end of their life at roughly the same time.
The order of assembly matters as much as the parts. Clean the block, check flatness and set liner protrusion before any piston goes in.
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 shipping.
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 the 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.
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.
Run at varying load, increasing gradually, and change oil early. Holding full load immediately glazes the bores and leaves the rings unseated.
Clean air and correct oil decide how long the new parts last. Replace the air filter at interval, keep intake hoses sealed and fix any leak immediately rather than topping up.
Kits cover the wearing parts, but bearings, head bolts and rod bolts are ordered separately because they depend on the crankshaft size and on the engine's condition. Plan the whole order together; a kit waiting for a set of main bearings holds the rebuild just as effectively as a missing piston.
The piston is the part that changed between generations, because compression ratio and bowl design were revised alongside the injectors. Comparing the old crown with the new one before assembly catches a mismatch in minutes.
Bearings depend on the crankshaft size and stretch bolts on the head and rod design, so both are ordered separately. Plan them in the same order so the rebuild is not held up by a part that costs little but arrives late.
Write down the kit number, clearances and oil analysis results in the engine log. The next overhaul then starts with data rather than guesswork, and any warranty discussion is easier with figures on file.
Browse the Weichai engine overhaul kit category, and pair the kit with the WP7 and WP8 overhaul kit 1008699414 or the WP7 and WP8 cylinder liner 610800010503.
Compare the old piston crown and engine plate, or send us photos.
No, bearings are ordered separately.
Yes, the gasket set includes the head gasket.
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.
