3.7L Engine - Service Information: Overview Dodge Nitro I

Scheme 31

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. (Scheme 31)

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 TABLE and ENGINE MECHANICAL DIAGNOSTIC TABLE for possible causes and corrections of malfunctions. Refer to DIAGNOSIS AND TESTING for 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»(ref-306142-S34940693832008120900000) .
2. Cylinder Combustion Pressure Leakage Test. See «CYLINDER COMBUSTION PRESSURE LEAKAGE»(ref-306142-S18477012592008120900000) .
3. Engine Cylinder Head Gasket Failure Diagnosis. See «CYLINDER HEAD GASKET»(ref-306142-S11203183672008120900000) (Left) or «CYLINDER HEAD GASKET»(ref-306142-S31250309182008120900000) (Right).
4. Intake Manifold Leakage Diagnosis. See «DIAGNOSIS AND TESTING»(ref-306142-S02021390692008120900000) .