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Metal timing chains have become more widespread in car engines produced since the 1990s, due to the lack of the regular maintenance task of replacing a rubber timing belt. While the chains themselves are subject to minimal wear, lubrication of the chain or failure of the tensioner and chain guides can cause maintenance issues.
For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
DOHC, twin independent variable cam timing Valves per cylinder 4 Included angle between valves 41.75° Valve sizes Intake 30 mm (1.2 in), exhaust 24.1 mm (0.95 in) Camshaft drive Belt: Belt with dynamic tensioner Crankshaft 4 counter-weights: Cast iron, 4 counter-weights Crankshaft bearings 5 Engine management Siemens ECM EMS2101 16-bit: Siemens
Three timing chains are used, one from the crank to the jackshaft, one in the front of the engine to drive the cam for the left bank, and one on the back of the engine to drive the cam for the right bank. In addition, the 4WD Ranger/Explorer with the SOHC 4.0 had a 4th timing chain driving what Ford called a balance shaft. Ford has since phased ...
The AJD is a family of V6 and V8 turbodiesel engines with a clean-sheet architecture and variable valve timing developed by Ford of Europe for its then-subsidiaries Jaguar and Land Rover, as well as for its partner PSA Group working under the Gemini joint development and production agreement.
ODI says Ford already issued a recall related to this issue, but that the Expeditions, as well as potential issues affecting model year 2018-2019 Lincoln Navigator vehicles, were not included in ...
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