Date registered: Mar 2010
Vehicle: 1977 R107 450SL / 1988 W126 420SE
Location: San Jose, Costa Rica
Mentioned: 0 Post(s)
Quoted: 10 Post(s)
Thanks for the feedback the o-ring was in fact fuel wet, and without the spring installed it went in easily.
Problem is actually knowing if the force you are feeling is being exerted by the spring or the o-ring not wanting to get in.
So if I get this right the correct procedure should be:
1- Oil the o-ring a bit.
2- Press the whole unit until it feels like the o-ring has slipped in and the thread has made contact.
3- Should be able to easily screw by hand?
Another question that comes to mind, how come only changing 1 o-ring will mess up the tolerances so much as to vary the system pressure if I'm not messing with the shims?