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A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the rocker arm in an internal combustion engine, bolting with a gasket seal to the engine head. Engines with more than one head (such as a V8 ) will have multiple rocker covers.
In an internal combustion engine, a head gasket provides the seal between the engine block and cylinder head(s). Its purpose is to seal the combustion gases within the cylinders and to avoid coolant or engine oil leaking into the cylinders. [1] Leaks in the head gasket can cause poor engine running and/or overheating.
PCV valve on Ford Taunus V4 engine (feeding from left side valve cover into the inlet manifold) A crankcase ventilation system (CVS) removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold).
All 1997–1998 engines made at the Canadian Essex plant received a bad front cover gasket. [12] Ford initially addressed this problem by using a thicker gasket for the 1999 model year and five years later, in 2004, replaced the earlier gasket with a completely redesigned part.
If it becomes damaged the cylinder head must be replaced. The seals installed onto the ends of the sparkplug pipes seal against the valve covers and should be replaced when the valve cover is removed. pistons on the engines have a 0.5 mm (0.020 in) offset, with the engine having a compression ratio of 10.0 to 1.
The cast aluminum valve cover featured 15 bolts, the industry's most, to achieve a positive seal. [26] The new engine, which was introduced in 1986 for the 1987 model year, was a further evolution of AMC's 258 six. [27] [28] It had a 3.875 in (98.4 mm) bore and a 3.414 in (86.7 mm) stroke giving it a displacement of 241.6 cu in (4.0 L). [29]
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