Running and Racing Reliably Part II: Continuing At The Bottom
It's important to examine the check-ball seat (inside the upper hole) to ensure that it's machined concentric and its width is constant. The check-ball seat is machined in after casting. If core shift is severe or a material void exists during casting, it will effect the seat. This is very rare but it does happen, according to Jim. A telltale sign is low oil pressure at idle due to oil leaking past the check-ball and seat but normal pressure at higher rpm since the check ball is off the seat at this point. Here you can see that the casting process did in fact encroach on the check ball seat but the amount is not enough to cause concern in this street engine. This pump will be fine to use. View Related Article
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