Oil pump tab washer. Porsche 911 / 914  ❭  99903900100

Oil pump tab washer.
Oil pump tab washer designed to secure and lock the oil pump fastener on classic Porsche engines. Although small, this locking washer plays a critical role in preventing oil pump hardware from loosening due to engine vibration and repeated heat cycles.

Fits:
Porsche 911 1965 - 1986
Porsche 911 Turbo 1975 - 1977
Porsche 914 1970 - 1976

Diagram ref no 4

By acting as a mechanical locking device, it helps keep the oil pump firmly in position, supporting stable oil pressure and reliable engine lubrication. Proper retention of the oil pump is essential for long-term engine protection and performance.

Tab washers are intended to be bent into place once. Reusing a previously bent washer can cause metal fatigue and reduced holding strength, increasing the risk of fasteners backing out. Replacing the washer during service is a simple, low-cost way to safeguard engine reliability and prevent premature wear.

When to replace:
• During oil pump removal, refit, or engine rebuild
•  If the washer tab has been previously bent or straightened
•  When cracking, distortion, or fatigue is visible
•  Any time oil pump fasteners are loosened during maintenance

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99903900100

The product you are viewing cross references to these numbers