<SUBMISSION>
<ACCESSION-NUMBER>0001513162-14-000259
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20140424
<FILING-DATE>20140424
<DATE-OF-FILING-DATE-CHANGE>20140424
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>CLEAN DIESEL TECHNOLOGIES INC
<CIK>0000949428
<ASSIGNED-SIC>3564
<IRS-NUMBER>061393453
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 100
<CITY>VENTURA
<STATE>CA
<ZIP>93003
<PHONE>805 639 9458
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>4567 TELEPHONE ROAD
<STREET2>SUITE 100
<CITY>VENTURA
<STATE>CA
<ZIP>93003
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>Shea David Eric
<CIK>0001502954
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-33710
<FILM-NUMBER>14782145
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>C/O CLEAN DIESEL TECHNOLOGIES, INC.
<STREET2>4567 TELEPHONE ROAD, SUITE 206
<CITY>VENTURA
<STATE>CA
<ZIP>93003
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2014-04-24</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000949428</issuerCik>
        <issuerName>CLEAN DIESEL TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>CDTI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001502954</rptOwnerCik>
            <rptOwnerName>Shea David Eric</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CLEAN DIESEL TECHNOLOGIES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4567 TELEPHONE ROAD, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>VENTURA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93003</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP Fin., Treas., Corp. Cont.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5699</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.68</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2011-03-17</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2021-03-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.41</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2013-02-22</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2022-05-24</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23529</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5229</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>12238</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>15000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock Option vested 50% on March 17, 2011 and 50% on March 17, 2012.</footnote>
        <footnote id="F2">Stock Option vested 1/3 on each of February 22, 2013 and February 22, 2014. Remaining 1/3 vests on February 22, 2015.</footnote>
        <footnote id="F3">Each Restricted Stock Unit (&quot;RSU&quot;) represents a contingent right to receive one share of CDTI Common Stock.</footnote>
        <footnote id="F4">RSUs vest as to 50% on March 20, 2014 and March 20, 2015. RSUs paid to participant as soon as practicable following the date of vesting, but in all cases within two and one-half months following the end of the Issuer's tax year that includes the date such RSUs vest.</footnote>
        <footnote id="F5">RSUs vest as to 1/3 on each of March 20, 2014, March 20, 2015 and March 20, 2016. RSUs paid to participant as soon as practicable following the date of vesting, but in all cases within two and one-half months following the end of the Issuer's tax year that includes the date such RSUs vest.</footnote>
        <footnote id="F6">RSUs vest as to 1/3 on each of March 20, 2015, March 20, 2016 and March 20, 2017. RSUs paid to participant as soon as practicable following the date of vesting, but in all cases within two and one-half months following the end of the Issuer's tax year that includes the date such RSUs vest.</footnote>
    </footnotes>

    <remarks>Exhibit 24 Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Kristi Cushing for David E. Shea</signatureName>
        <signatureDate>2014-04-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poashea4_242014.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
<HTML>
<head><title>_</title> </head> <body style="FONT-SIZE:10pt; FONT-FAMILY:Times New Roman; COLOR:#000000; MARGIN-TOP:0px"> <p style="FONT-FAMILY:Arial; MARGIN:0px" align=center>&nbsp;</p> <p style="FONT-FAMILY:Arial; MARGIN:0px" align=center><b>POWER OF ATTORNEY</b></p> <p style=MARGIN:0px align=justify><br></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:0.5in" align=justify>Know all by these presents, that the undersigned hereby constitutes and appoints each <u>Nikhil Mehta, Pedro J. Lopez-Baldrich and Kristi Cushing</u> or any of them signing singly, and with full power of substitution, the undersigned's true and lawful attorney-in-fact to:</p> <p style=MARGIN:0px align=justify><br></p> <p style="MARGIN-BOTTOM:-2px; FONT-FAMILY:Arial; WIDTH:96px; FLOAT:left; MARGIN-TOP:0px; TEXT-INDENT:48px">(1)</p> <p style="FONT-FAMILY:Arial; PADDING-LEFT:96px; MARGIN:0px; TEXT-INDENT:-2px" align=justify>prepare, execute in the undersigned&#146;s name and on the undersigned&#146;s behalf, and submit to the U.S. Securities and Exchange Commission (the &#147;<b>SEC</b>&#148;) a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation of the SEC;</p> <p style="CLEAR:left; MARGIN:0px" align=justify><br></p> <p style="MARGIN-BOTTOM:-2px; FONT-FAMILY:Arial; WIDTH:96px; FLOAT:left; MARGIN-TOP:0px; TEXT-INDENT:48px">(2)</p> <p style="FONT-FAMILY:Arial; PADDING-LEFT:96px; MARGIN:0px; TEXT-INDENT:-2px" align=justify>execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or director of <u>Clean Diesel Technologies, Inc.</u> (the &#147;<b>Company</b>&#148;), Forms&nbsp;3, 4, and 5 in accordance with Section&nbsp;16(a) of the Securities Exchange Act of 1934 and the rules thereunder, as amended;</p> <p style="CLEAR:left; MARGIN:0px" align=justify><br></p> <p style="MARGIN-BOTTOM:-2px; FONT-FAMILY:Arial; WIDTH:385px; FLOAT:left; MARGIN-TOP:0px; MARGIN-RIGHT:-326px; TEXT-INDENT:48px">(3)</p> <p style="FONT-FAMILY:Arial; PADDING-LEFT:96px; MARGIN:0px; TEXT-INDENT:-2px" align=justify>do and perform any and all acts for and on behalf of the undersigned that may be necessary or desirable to complete and execute any such Form&nbsp;3, 4, or 5, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and</p> <p style="CLEAR:left; MARGIN:0px" align=justify><br></p> <p style="MARGIN-BOTTOM:-2px; FONT-FAMILY:Arial; WIDTH:96px; FLOAT:left; MARGIN-TOP:0px; TEXT-INDENT:48px">(4)</p> <p style="FONT-FAMILY:Arial; PADDING-LEFT:96px; MARGIN:0px; TEXT-INDENT:-2px" align=justify>take any other action of any type whatsoever in connection with the foregoing that, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact&#146;s discretion.</p> <p style="CLEAR:left; MARGIN:0px" align=justify><br></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:0.5in" align=justify>The undersigned hereby grants to each such attorney-in--fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. &nbsp;The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section&nbsp;16 of the Securities Exchange Act of 1934, as amended.</p> <p style=MARGIN:0px align=justify><br></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:0.5in" align=justify>This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms&nbsp;3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.</p> <p style=MARGIN:0px align=justify><br></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:0.5in" align=left>IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 24th day of April, 2014.</p> <p style=MARGIN:0px align=justify><br></p> <p style=MARGIN:0px align=justify><br></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:384px" align=justify><u>/s/ David E. Shea</u></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:384px" align=justify>Signature</p> <p style=MARGIN:0px align=justify><br></p> <p style="MARGIN-BOTTOM:-2px; FONT-FAMILY:Arial; WIDTH:624px; FLOAT:left; MARGIN-TOP:0px; TEXT-INDENT:384px"><u>David E. Shea</u></p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:-2px" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;</p> <p style="FONT-FAMILY:Arial; MARGIN:0px; TEXT-INDENT:384px" align=justify>Print Name</p> <p style="CLEAR:left; MARGIN:0px"><br></p> <p style=MARGIN:0px><br></p> <p style=MARGIN:0px><br><br></p> <p style=MARGIN:0px><br></p> <p style=MARGIN:0px><br></p> <p style=MARGIN:0px><br></p></body>
<!-- EDGAR Validation Code: 891685CB -->
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</TEXT>
</DOCUMENT>
</SUBMISSION>
