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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.
The VG engine is a family of V6 engines designed and produced by Nissan between 1983 and 2004.. Nissan's and Japan's first mass-produced V6, the iron block/aluminum head 60° VG engine was produced in displacements between 2.0 and 3.3 liters.
It has been installed in the Nissan Civilian series (W40, W41) and the Nissan Safari/Patrol (Y60/61). Original engines (until 1996) were fitted with 28 mm gudgeon pins whilst from 08/1996 onwards, Nissan fitted 30 mm pins. The rear seal also changed from a conventional style to a unitized style around September 1997.
The Nissan D-series is an overhead valve series of engines which first appeared in 1964, with the 1.05-liter D engine. Similar to a number of British and other Datsun engines, it may have been derived from an Ohta design which also found its way into some Kurogane vehicles - both of these companies were swallowed up by Nissan in the early 1960s.
The 2.5 L (2,488 cc) SD25 is the biggest version of the four-cylinder SD series, with the larger bore and stroke of 89 mm × 100 mm (3.50 in × 3.94 in). It was fitted to Nissan 720 pickup trucks 1983 through 1986 and D21 Nissan pickups (only 1986–1988). In some European markets it was also fitted to the Nissan Urvan and Cabstar.
The traditional five-bolt pentagonal cylinder head pattern was replaced with a square four-bolt design (much like the 1964–1990 Oldsmobile V8), and the pistons are of the flat-topped variety (in the LS1, LS2, LS3, LS6, LS7, LQ9, and L33), while all other variants, including the new LS9 and LQ4 truck engine, received a dished version of the GM ...
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