I just bought a 1977 300D that has been sitting for a year. I changed the glow plugs because they were bad; drained the old fuel and filled it with fresh diesel, changed all the filters and fuel lines; tested the fuel pump and all electrical circuits. The engine turns, the glow plugs light up but it does not fire and start. At first I did not have enough oil compression so after getting different pieces of advice, I used about 6 oz of transmission fluid poured down the injectors to build up the engine compression. The engine started knocking, but still no fire. Any other ideas?

Thank you in advance.