When replacing an engine due to internal damage on 2019 and prior GM passenger cars and trucks, extreme care should be taken when transferring components from the failed engine to a new GM Genuine Parts service engine.
Any components transferred from a failed engine must be cleaned and inspected prior to installation onto the new engine. Damage can occur to the replacement engine if the intake manifold is not properly cleaned or replaced if necessary or, in the case of a damaged catalytic converter, if debris is drawn back into the engine.
Internal Damage
Internal engine damage may have resulted in the potential discharge of internal engine component debris into the intake manifold from any broken pistons or bent, broken, or missing intake valves. Broken valves and pistons as well as piston-to-cylinder head damage all create material debris that scatters throughout the induction system.
从损坏的发动机移除进气歧管后，检查所有气缸盖进气口，看看阀头仍然存在而不是弯曲。通常，当阀头缺失或充分弯曲时，内部发动机部件碎片将存在于气缸盖的进气口中的变化程度。如果节流阀主体开口中存在任何碎片（图10）或任何气缸盖进气口（图11），则应更换进气歧管。
图10.
图11.
Complex Configuration
大部分进气歧管的复杂入口跑步器和压力通风型构造都难以彻底地清洁组件。（图12）此外，几乎不可能验证由于复杂的配置而完全去除碎屑，如果存在任何碎片，则更换要求。
图12.
Looking at an internal view of the plastic intake manifold lower half (the plastic intake manifold cannot be disassembled), the intake port to cylinder head opening (Fig. 13, #1) is just one of several areas where debris can collect.
图13.
Reinstallation of an intake manifold removed from an engine with deposits of internal engine component debris may result in the ingestion of any remaining debris into the new service engine, which will lead to damage or potential failure of the new service engine long block.
催化转换器失败
When catalytic converter failures occur and the inner brick becomes plugged and breaks apart, the catalytic converter material can be drawn back into the engine during valve overlap and transfer throughout the intake manifold and into the cylinder. Any such material transfer can cause heavy wear to piston rings and cylinder walls. In addition, misfires and oil consumption are the byproducts of ingested catalytic converter material into the combustion chamber and cylinder bores.
对发动机替换附加信息fter engine damage, refer to the latest version of Bulletin #00-06-01-026.
- 感谢Larry偏航
