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fuel injectors leaking
Posted: Tue Apr 25, 2023 5:07 pm
by RED944M5
- 944 show2.jpg (204.66 KiB) Viewed 959 times
I have a 1985.5 N/A 944 .. and I just did the head gasket replacement and all the parts/gaskets ect. that go with that, along with a few upgrades ... I also benched cleaned the fuel injectors and replaced all the o-rings and seats ... I buttoned it all up and let fuel rail fill and then started the car ... it ran pretty good and the timing seemed good .. but I noticed the fuel was leaking out of the injector seats ... so I shut it off, pulled neg cable, took all the fuel rail/injector parts off and checked everything, reseated everything and tightened down ... re-buttoned up .. started it up again .. running good ... leaking much less, but still leaking out of each seat area
anybody got any suggestions ??
- Eric
Re: fuel injectors leaking
Posted: Tue Apr 25, 2023 5:43 pm
by Tom
RED944M5 wrote: Tue Apr 25, 2023 5:07 pm
944 show2.jpg
I have a 1985.5 N/A 944 .. and I just did the head gasket replacement and all the parts/gaskets ect. that go with that, along with a few upgrades ... I also benched cleaned the fuel injectors and replaced all the o-rings and seats ... I buttoned it all up and let fuel rail fill and then started the car ... it ran pretty good and the timing seemed good .. but I noticed the fuel was leaking out of the injector seats ... so I shut it off, pulled neg cable, took all the fuel rail/injector parts off and checked everything, reseated everything and tightened down ... re-buttoned up .. started it up again .. running good ... leaking much less, but still leaking out of each seat area
anybody got any suggestions ??
- Eric
Where did you get the o-rings? My random internet guess is that maybe you used the wrong ones? And/or the pintle cap and spacer are not right or on wrong. Maybe post a pic of the assembled injectors so we can look for clues.
Re: fuel injectors leaking
Posted: Tue Apr 25, 2023 6:02 pm
by RED944M5
I can take pics tomorrow when i tear it down again ... but in the mean time .. i bought the kit from lindsey racing
- $24 fuel inj seals Lindsey.jpg (69.48 KiB) Viewed 949 times
they look like this
- inj.jpg (30.51 KiB) Viewed 949 times
but the seat caps are yellow ... the injectors are black with brown top areas and the bottom part has a an o-ring the plastic ring and a space .. so is there supposed to be an o-ring sandwich down there ? (o-ring, plastic ring, then o-ring)
Re: fuel injectors leaking
Posted: Tue Apr 25, 2023 6:18 pm
by RED944M5
ya they def dont look like this .. there is a big space between plastic ring and bottom of inj body .. so do I gotta press the seat on better i guess .. it felt like it was all the way on though .. do I have to press pintle thru hole ? .. press hard on seat more ?
Re: fuel injectors leaking
Posted: Tue Apr 25, 2023 8:10 pm
by Tom
Bosch has included the wrong pintle caps for the 944 injectors for years. Almost all resellers give you the yellow Bosch (incorrect) caps, which don't seat all the way, like you are describing, so most people just keep the originals. No idea if Lindsey has sorted that out with their kit, but I'm guessing not based on your experience. The only retailer I know that supplies the right caps for sure is @Rennbay. I thinking the Rennbay kit would fix your leak...
Re: fuel injectors leaking
Posted: Wed Apr 26, 2023 4:05 am
by RED944M5
thanks so much .. you just saved me a bunch of headaches .. i knew i did everything correct .. i was very careful and took months to do the whole job .. im ordering the rennbay kit .. ya the pic at rennbay even matches the color of the old parts
Re: fuel injectors leaking
Posted: Wed Apr 26, 2023 7:43 am
by Tom
RED944M5 wrote: Wed Apr 26, 2023 4:05 am
thanks so much .. you just saved me a bunch of headaches .. i knew i did everything correct .. i was very careful and took months to do the whole job .. im ordering the rennbay kit .. ya the pic at rennbay even matches the color of the old parts
I'd be a little surprised if Lindsey isn't aware of the cap issue, since it's been discussed many many times online, but the hats in the Bosch reseal kit just aren't right. And the no-name caps all seem to replicate the Bosch versions. Those caps are too tall and keep the injector from seating all the way down, which in turn keeps the o-ring from sinking down far enough to make a good seal. In fact, if you look at yours fully assembled now, I bet you'll see that bottom o-ring only partially engaged in its port.....
Re: fuel injectors leaking
Posted: Wed Apr 26, 2023 6:12 pm
by RED944M5
- IMG_1998.jpeg (886.56 KiB) Viewed 885 times
heres my fuel injectors with the yellow caps .. as you can see theres a huge space and it doesn't look right … im ordering the rennbay ones
-Eric
Re: fuel injectors leaking
Posted: Wed Apr 26, 2023 6:27 pm
by Tom
RED944M5 wrote: Wed Apr 26, 2023 6:12 pm
IMG_1998.jpeg
heres my fuel injectors with the yellow caps .. as you can see theres a huge space and it doesn't look right … im ordering the rennbay ones
-Eric
Good plan! That gap isn't right...
Re: fuel injectors leaking
Posted: Mon May 01, 2023 8:07 pm
by RED944M5
- IMG_2014.jpg (141.17 KiB) Viewed 824 times
Heres the rennbay ones now in blue appearently, next to the previous leaky ones ... and I just installed the rennbay ones ... works like a charm .. no leaks ... 3d printed timing belt tool and 3d printed cam gear tool worked like a charm, belts all working good, no leaks, no white smoke ... took it for a ride, it's been down for 2 years because I was overseas for a bit .. it was quite exciting to drive it again !!
