Easiest and best way to reinstall injectors

For all your questions, problems and DIY stories
Post Reply
repoman
E21 starter
Posts: 23
Joined: Sun Mar 10, 2013 4:27 am
My E21(s): 1983 320iS bronzitbeige
1982 320i
Location: Brea, California USA

Easiest and best way to reinstall injectors

Post by repoman »

Hello,

What is the best way to reinstall injectors with the new o rings to ensure proper seating? Rubber mallet and silicone spray? Thank you in advance for your experience!


Stand-in
Upcoming E21 fanatic
Posts: 78
Joined: Tue Jan 09, 2024 2:46 am
My E21(s): 1977 320i US Manual
Location: PNW

Re: Easiest and best way to reinstall injectors

Post by Stand-in »

Typically I place the oring on the injector, and then use silicone spray as you suggest. I also have used a dull chisel and hammer to pop it in with respect to clearance issues. A rubber mallet would do more to preserve the hardware, but I also like to have them connected before I insert them. I find that sticking the orings first makes it hard to get the injector started. Also I have found that pb blaster makes a better lubricant, though it may be bad for the rubber/nitril.
User avatar
Jeroen
Site Admin
Posts: 29808
Joined: Tue Sep 14, 2004 12:23 pm
My E21(s): '81 323i Baur
Location: The Netherlands
Contact:

Re: Easiest and best way to reinstall injectors

Post by Jeroen »

Yeah I did the same, fit together with the o-ring, and then carefully tapped it in using a small plastic scraper from various sides to prevent them going in under the wrong angle or damaging them. Worked well with the intake manifold installed.
Regards/groeten, Jeroen
repoman
E21 starter
Posts: 23
Joined: Sun Mar 10, 2013 4:27 am
My E21(s): 1983 320iS bronzitbeige
1982 320i
Location: Brea, California USA

Re: Easiest and best way to reinstall injectors

Post by repoman »

Thank you for your comments. The head is actually off the block, so I want to install these prior to reinstalling the head. I have a spare/broken fuel line that have the end cap that I plan on installing on the injector while lightly tapping.
Last edited by repoman on Sun Dec 15, 2024 11:32 pm, edited 1 time in total.
User avatar
Jeroen
Site Admin
Posts: 29808
Joined: Tue Sep 14, 2004 12:23 pm
My E21(s): '81 323i Baur
Location: The Netherlands
Contact:

Re: Easiest and best way to reinstall injectors

Post by Jeroen »

:thumbsup
Regards/groeten, Jeroen
repoman
E21 starter
Posts: 23
Joined: Sun Mar 10, 2013 4:27 am
My E21(s): 1983 320iS bronzitbeige
1982 320i
Location: Brea, California USA

Re: Easiest and best way to reinstall injectors

Post by repoman »

All injectors installed with the silicone spray and some hammering...some harder than others, however, no damage! Thanks again.
Post Reply