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What cause a engine knock and make the oil smell like gas this is a new motor in 2008 Nissan?
Wiki User
∙ 13y ago
This is a sign of a very serious problem. DO NOT run this engine like this, especially under load!! Fuel in your oil basically means that the oil is incapable of lubricating the engine, you might as well run with no oil.
The symptoms described in your question sound very much like the piston rings have failed in at least one cylinder. This allows fuel to go directly into the oil sump and would probably be accompanied by knocking noises usually referred to as 'piston slap'.
There are multiple causes possible. The likely ones, regardless of engine age, are:
- Improper piston ring installation. (new or rebuilt engines)
- Improper engine break-in. (new or rebuilt engines and usually the driver's fault)
- Improper engine build or rebuild. (it happens)
- Defective rings. (again, it happens)
- Piston oiling malfunction in at least one cylinder causing the rings to fail.
- Long term ignition failure in one or more combustioin chambers could lead to raw fuel seeping into the oil sump.
- A blown out fuel injector would flood a cylinder with raw fuel which would seep into the oil sump.
Bottom line: If the engine is new or freshly rebuilt, go after the seller right now for replacement, not repair. I wouldn't trust the engine after this unless all of the pistons are reringed and all of the cylinders are rebored or sleeved and all the valves resealed, etc., it's basically been run with no oil; Pretty much a complete rebuild anyways, but if you allow them to repair it, they will reuse as many parts and gaskets as possible to save themselves money; Reusing parts that may not be up to specification any more. If you paid for new, demand new. Don't wait, this problem is guaranteed to destroy your engine if it hasn't already.
Wiki User
∙ 13y ago
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