3.7L Engine - Service Information: Overview Dodge Durango II рестайлинг

Scheme 33

The 3.7 liter (226 CID) six-cylinder engine is an 90° single overhead camshaft engine. The cast iron cylinder block is made up of two different components; the first component is the cylinder bore and upper block, the second component is the bedplate that comprises the lower portion of the cylinder block and houses the lower half of the crankshaft main bearings. The cylinders are numbered from front to rear with the left bank being numbered 1,3, and 5 and the right bank being numbered 2,4, and 6. The firing order is 1-6-5-4-3-2. The engine serial number is located at the right front side of the engine block

ENGINE DIAGNOSIS - INTRODUCTION

Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine maintenance.

These malfunctions may be classified as either performance (e.g, engine idles rough and stalls) or mechanical (e.g, a strange noise).

See ENGINE PERFORMANCE DIAGNOSTIC CHART and ENGINE MECHANICAL DIAGNOSTIC CHART for possible causes and corrections of malfunctions. Refer to FUEL SYSTEM article for the fuel system diagnosis.

Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be isolated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the following diagnosis

1. Cylinder Compression Pressure Test. See «CYLINDER COMPRESSION PRESSURE LEAKAGE»(ref-285333-S38637778482008052100000) .
2. Cylinder Combustion Pressure Leakage Test. See «CYLINDER COMBUSTION PRESSURE LEAKAGE»(ref-285333-S19970925312008052100000) .
3. Engine Cylinder Head Gasket Failure Diagnosis. See «CYLINDER HEAD GASKET»(ref-285333-S34649096602008052100000) .
4. Intake Manifold Leakage Diagnosis. See «INTAKE MANIFOLD LEAKS»(ref-285333-S41785749562008052100000) .

Scheme 34

To ensure engine gasket sealing, proper surface preparation must be performed, especially with the use of aluminum engine components and multi-layer steel cylinder head gaskets.

Never use the following to clean gasket surfaces

1. Metal scraper.
2. Abrasive pad or paper to clean cylinder block and head.
3. High speed power tool with an abrasive pad or a wire brush (1).

Note. Multi-Layer Steel (MLS) head gaskets require a scratch free sealing surface.

Only use the following for cleaning gasket surfaces

1. Solvent or a commercially available gasket remover
2. Plastic or wood scraper (3).
3. Drill motor with 3M Roloc™ Bristle Disc (white or yellow) (2).