![]() The cup is usually machined from a softer alloy like copper, which not only helps the cup conform to and seal the cylinder head, but also helps cool the injector. To prevent damaged cylinder heads and keep a good injector seal, manufacturers have introduced an injector cup. When this happens, the cylinder head can become damaged enough that replacement is necessary because the O-rings no longer seal inside the pitted cylinder head ( Figure 1). After a period of years or miles, the O-rings can distort and allow moisture inside, which can cause pitting where the O-rings are supposed to seal. The injector itself often has a stainless steel body with rubber O-rings that have to seal inside the cylinder head. ![]() The cylinder heads of diesel engines may be cast iron or aluminum. This is something, however, you may want to consider if your diesel engine customers are racking up the miles or getting a rebuild. ![]() Having problems with injector cups is something that you may never encounter. As engine parts go, they’re not very big but sometimes it’s the little things that cause the big problems. ![]()
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