I'm putting her back together and replaced the O-rings in the injectors as they were looking pretty old and cracked from having the fuel rail out of the head. I got the parts from FCP and replaced the O-ring at the nozzle and the one that connects into the rail. The ones in the rail when in fine.

Trying to fit the ones back into the cylinder head seems to be difficult for some reason. I'm not sure if I'm just not giving it enough muscle, but I don't want to break anything either. The O-rings have the same inside diameter but seem to have a larger outside, not by much but could just seem like that since they're new.

Anyway, any ideas on how to get the injectors or just keep muscling it??

 

I use a little Vaseline.

 

Or a little dish soap and water.

 

on my 87 240 wagon.....

clean injector ports
put nose of injectors in all holes....they popped in as I was tightening the 10mm bolts in...did this about 10 times and only twice did I have a leak on one of them due to my hastiness.