Model: WD615 / WP10
Part Number: 612600030051
Brands: Weichai Power
Engine Model: WD615, WD615E2, WD10, WP10, WP10G
Engine Type: Diesel
Scope of application: heavy trucks, buses, construction machinery, generator sets
Piston rings do three jobs at once. They seal combustion gas, they conduct heat from the piston into the liner, and they scrape oil back into the sump. On the Weichai WD615 and WP10, ring set 612600030051 is the standard three-ring set per piston: two compression rings and one oil control ring.
When rings wear, the engine does not fail suddenly. It starts burning oil, the crankcase pressure rises, the breather blows vapour, and performance slowly drops because combustion gas escapes past the piston. Owners often blame the turbo first, which is why a compression test and a blow-by check should come before any part is ordered.
The set fits WD615 and WP10 engines in trucks, buses and industrial equipment, including HOWO and Shacman tractors, city buses, wheel loaders and 80 to 250 kVA generator sets. Ring size is matched to the piston and bore, so confirm the piston part number and the standard or oversize bore before ordering. Mixing ring sets between engine variants is a common cause of excessive oil consumption after an overhaul.
Rings must never be filed to fit without a proper gap gauge and the correct specification. A tight gap seizes the ends and breaks the ring; an oversize gap allows blow-by that no amount of tuning can fix.
If the bore has a top ring ridge, the liner must be replaced. New rings in a worn bore seal for a short time and then fail again.
Break-in determines how well rings seal for the rest of their life. Hard idling glazes the bores and prevents the rings from bedding in.
Match the piston part number, the bore size and the engine rating. Standard and oversize sets look similar but cannot be interchanged. For rebuilds, order rings together with liners and pistons as a matched set, which removes clearance uncertainty and shortens assembly time.
Clean air and correct oil are what keep rings alive. Replace the air filter on schedule, keep the intake hoses sealed, use the specified oil grade and change it at the severe-duty interval. Keep the cooling system healthy as well: overheating softens ring tension and accelerates wear on the top ring.
The top ring faces the full combustion pressure and the highest temperature, which is why it is chrome faced and barrel shaped to maintain contact as the piston rocks in the bore. The second ring acts as a back-up seal and a scraper, removing most of the oil that reaches the upper land. The oil control ring uses two rails and an expander to scrape oil from the bore and return it through the piston drain holes.
Each of the three has a specific radial tension and face angle. Fitting them in the wrong groove, or upside down, changes how the engine consumes oil and can make a freshly rebuilt engine smoke worse than before. Always compare the old rings with the new set before assembly and check the markings on the top face.
One set covers one piston: two compression rings and one oil control ring.
Only if the bore is within specification and still shows a proper cross hatch. Otherwise replace or re-hone the liners.
Only if the measured gap requires adjustment and you have the correct specification. Measure in the actual bore.
Most often glazed bores, wrong gaps or rings fitted upside down. Check the markings and break-in procedure.
Browse the Weichai piston and components category, and complete the rebuild with the WD615 cylinder head 61560040040 or the WD615 cylinder block 1002099589.
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.
Piston rings do three jobs at once. They seal combustion gas, they conduct heat from the piston into the liner, and they scrape oil back into the sump. On the Weichai WD615 and WP10, ring set 612600030051 is the standard three-ring set per piston: two compression rings and one oil control ring.
When rings wear, the engine does not fail suddenly. It starts burning oil, the crankcase pressure rises, the breather blows vapour, and performance slowly drops because combustion gas escapes past the piston. Owners often blame the turbo first, which is why a compression test and a blow-by check should come before any part is ordered.
The set fits WD615 and WP10 engines in trucks, buses and industrial equipment, including HOWO and Shacman tractors, city buses, wheel loaders and 80 to 250 kVA generator sets. Ring size is matched to the piston and bore, so confirm the piston part number and the standard or oversize bore before ordering. Mixing ring sets between engine variants is a common cause of excessive oil consumption after an overhaul.
| We Are 30 Years Diesel Engine Parts Supplier | |
| Brand | EPID |
| Warranty | 12 Months |
| Condition | 100%New |
| More Models | Weichai: WD615, WD615E2, WD10, WP10, WP10G, 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 |
Rings must never be filed to fit without a proper gap gauge and the correct specification. A tight gap seizes the ends and breaks the ring; an oversize gap allows blow-by that no amount of tuning can fix.
If the bore has a top ring ridge, the liner must be replaced. New rings in a worn bore seal for a short time and then fail again.
Break-in determines how well rings seal for the rest of their life. Hard idling glazes the bores and prevents the rings from bedding in.
Match the piston part number, the bore size and the engine rating. Standard and oversize sets look similar but cannot be interchanged. For rebuilds, order rings together with liners and pistons as a matched set, which removes clearance uncertainty and shortens assembly time.
Clean air and correct oil are what keep rings alive. Replace the air filter on schedule, keep the intake hoses sealed, use the specified oil grade and change it at the severe-duty interval. Keep the cooling system healthy as well: overheating softens ring tension and accelerates wear on the top ring.
The top ring faces the full combustion pressure and the highest temperature, which is why it is chrome faced and barrel shaped to maintain contact as the piston rocks in the bore. The second ring acts as a back-up seal and a scraper, removing most of the oil that reaches the upper land. The oil control ring uses two rails and an expander to scrape oil from the bore and return it through the piston drain holes.
Each of the three has a specific radial tension and face angle. Fitting them in the wrong groove, or upside down, changes how the engine consumes oil and can make a freshly rebuilt engine smoke worse than before. Always compare the old rings with the new set before assembly and check the markings on the top face.
Browse the Weichai piston and components category, and complete the rebuild with the WD615 cylinder head 61560040040 or the WD615 cylinder block 1002099589.
One set covers one piston: two compression rings and one oil control ring.
Only if the bore is within specification and still shows a proper cross hatch. Otherwise replace or re-hone the liners.
Only if the measured gap requires adjustment and you have the correct specification. Measure in the actual bore.
Most often glazed bores, wrong gaps or rings fitted upside down. Check the markings and break-in procedure.
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.
