Exhibit 31.2


                   AMPCO-PITTSBURGH CORPORATION

I, Marliss D. Johnson certify that:

  I have reviewed this Form 10-Q of Ampco Pittsburgh Corporation;

  Based on my knowledge, this report does not contain any untrue
  statement of a material fact or omit to state a material fact
  necessary to make the statements made, in light of the
  circumstances under which such statements were made, not
  misleading with respect to the period covered by this report;

  Based on my knowledge, the financial statements, and other
  financial information included in this report, fairly present in
  all material respects the financial condition, results of
  operations and cash flows of the registrant as of, and for, the
  periods presented in this report;

  The registrant's other certifying officer(s) and I are
  responsible for establishing and maintaining disclosure controls
  and procedures (as defined in Exchange Act Rules 13a-15(e) and
  15d-15(e)) and have:

     (a) Designed such disclosure controls and procedures, or
     caused such disclosure controls and procedures to be designed
     under our supervision, to ensure that material information
     relating to the registrant, including its consolidated
     subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report
     is being prepared;

     (b) Evaluated the effectiveness of the registrant's disclosure
     controls and procedures and presented in this report our
     conclusions about the effectiveness of the disclosure controls
     and procedures, as of the end of the period covered by this
     report based on such evaluation; and

     (c) Disclosed in this report any change in the registrant's
     internal control over financial reporting that occurred during
     the registrant's most recent fiscal quarter that has
     materially affected, or is reasonably likely to materially
     affect, the registrant's internal control over financial
     reporting; and

  The registrant's other certifying officer(s) and I have
  disclosed, based on our most recent evaluation of internal
  control over financial reporting, to the registrant's auditors
  and the audit committee of the registrant's board of directors
  (or persons performing the equivalent functions):

     (a) All significant deficiencies and material weaknesses in
     the design or operation of internal control over financial
     reporting which are reasonably likely to adversely affect the
     registrant's ability to record, process, summarize and report
     financial information; and

     (b) Any fraud, whether or not material, that involves
     management or other employees who have a significant role in
     the registrant's internal control over financial reporting.


s/Marliss D. Johnson
Marliss D. Johnson,
Vice President, Controller, Treasurer
August 5, 2004