Crowley Marine: serving boaters for over 40 years Crowley Marine: serving boaters for over 40 years
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Use this kit to update Evinrude E-TEC 250-300HP (3.4 liter) outboards: 2008 models or 2009 “C” or “S” suffix models. Refer to appropriate 2009 parts catalogs and 2009 service manuals for additional information. (NOTE: All 2009 “F” suffix 250-300HP models were built with the inner exhaust assembly, P/N 5007973, in this kit and DO NOT require this update kit.)

P/N Description Quantity
334936 Screw, mount bracket


346151 Clamp, 21 mm 2
349729 Clamp, 41 mm 2
349759 Clamp, 31.6 mm (overboard indicator) Use only ONE (1).
Select as required. See text below.
352335 Clamp, 33.1 mm (overboard indicator)
353224 Gasket, powerhead to exhaust housing 1
354581 Water tube - 30" model Use only ONE (1).
Select for 20", 25", or 30" driveshaft.
354582 Water tube - 25" model
354583 Water tube - 20" model
5007970 Pressure valve assembly 1
5007972 Water pump kit 1
5007973 Inner exhaust assembly 1

Install inner exhaust housing, P/N 5007973.

Install water tube as required for 20”, 25”, or 30” model.

Install water pump kit, P/N 5007972. Select and install clamp on the overboard indicator hose. Clamp must be positioned and crimped properly. Clamp must not turn or slide after installed.

  • Select and install 31.6 mm clamp on the overboard indicator hose if outside diameter of adaptor tube is 0.925 in. (23.495 mm).
  • Select and install 33.1 mm clamp on the overboard indicator hose if outside diameter of adaptor tube is 0.980 in. (24.892 mm).

Install pressure valve, P/N 5007970.

Use Evinrude Diagnostics software to confirm engine management software is current. Update engine management software if needed. Refer to “Software Replacement” in service manual.

Use Evinrude Diagnostics Software to check engine operating temperature. Refer to “Engine Temperature Check” in service manual.

Check engine water pressure at IDLE (500 RPM). Water pressure should be 4 psi (28 kPa) or higher.

5007971 - Engine Cover Assembly

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We offer shipping flat $3.95 shipping on ALL parts orders. (Complete Engines, Lower Units and Sterndrives excluded). In addition orders over $89 have reduced cost express shipping available in checkout.

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