If you have a Lincoln Classic 300 D with code numbers above, you have a Perkins Diesel engine. Your life is going to get a lot easier. Why, you ask, try finding the exact part for your engine.  The parts listed on this page will fit your machine; problem solved. Some of the parts can be ordered from our site. If I can offer you a better price, I will ask you to order through an affiliate link. I get a small (damn small) commission on your order; it costs you nothing. If you order this way, I will provide the after-sales phone service.