Oil Pump Installation

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Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure If oil pump is removed to perform a different repair and is going to be REUSED, the alignment tool EN-51267 oil pump alignment tool MUST be installed on the engine block BEFORE the oil pump is removed and left in place until the installation of the original oil pump. If EN-51267 oil pump alignment tool IS NOT installed prior the oil pump being removed AND left in place while other repairs are performed, a NEW oil pump MUST be installed. If a NEW pump is installed, EN-51267 is NOT needed. A NEW oil pump will automatically center correctly when installed.
1	Oil Pump Procedure Prior to installing the oil pump, ensure that oil pump housing gasket (3) is fully installed in the timing chain tensioner (4) and is not damaged. If the gasket is missing or damaged, replace the tensioner.
2	Oil Pump Bolt CAUTION: Refer to Fastener Caution . Procedure Tighten the oil pump bolts in the sequence shown. If installing a NEW oil pump or reusing an existing oil pump, upward pressure must be applied to the oil pump while tightening the fasteners. If REUSING an existing pump and EN-51267 is installed, contact between the oil pump housing and the oil pump alignment tool must be maintained while oil pump bolts are tightened. Prior to removing the oil pump alignment tool, ensure that there is no gap between the oil pump housing and the tool. If there is a gap, the oil pump bolts need to be loosened and the installation procedure repeated. Tighten 25 N.m (18 lb ft) Special Tools EN-51267 Oil Pump Alignment Tool For equivalent regional tools, refer to Special Tools .
3	Oil Pump Housing Gasket
4	Timing Chain Tensioner