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A technician is performing a preventive maintenance check on an engine using the current oil analysis he finds that there is exessive silica chrome and iron listed that components would be involved?
Wiki User
∙ 14y ago
Silica is usually present from one of three sources :
Dirt - such as microfine sand (silicon dioxide): Check your air filter
Silicate - as in sodium silicate : a component of some radiator fluids : check for possible radiator leaks back into the engine oil. If the oil analysis is also showing high levels of moisture or elevated glycol levels then a busted head gasket or cracked head is a possibility.
Silicone - as in gasket goo : once again - possible head gasket breach.
Chrome is usually present from "hard chrome" faced parts. I'm a chemist, not an engineer, but my guess would be a chromed bearing or hard chromed crank or bore.
Iron is everywhere - but if you are finding lots of it in the oil it will come from either corrosion (look towards the cooling system again) or erosion (stripped from moving parts - bearings, crank or piston sleeves being the most likely wear areas).
Wiki User
∙ 14y ago
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