Are there any tricks to changing 308 fuel injectors? Could someone give me the step by step? Thanks Mike
Me too, I've just received the injectors from Bosch, together with the thermo time switch. However, the o-rings didn't come with the injectors, and I'd like to confirm the correct Bosch part number for a 308/328 Rui
The injectors are easy to R&R. They are held in only by the rubber O-rings. Unscrew the fuel lines and grab them--although they are hard to "grab" they just pull out. A friend made me a nice little "T" handled device that threads on the back of the injector. It is about 3" long and it worked great to pull them out. You could probably get by with making something out of A 1/4" pipe threaded fitting (it will loosely thread on to the injectors). The steel injectors are not really worth keeping so you could just grab them with a plier too. I have a couple of the fittings; if you email me I'll send you one [email protected]. The O-rings are common to a lot of CIS FI cars including VW, BMW, and MBZ. I understand there is a better green one, but it is slightly larger and therefore much harder to get in. Do not lube them with silicone spray--silicone will damage the O2 sensor; you can use just a little oil. The injector fits into a plastic insulator that is held into the manifold with a snap ring and another, larger O-ring. If you were feeling really ambitious you could change these O-rings too, but most people don't. The new ones are brass and the PN is 0 437 502 047 Mark
Thanks, Mark. That is good advice. It is that larger o-ring that I'm looking for. Later today I'm going to Bosch and see waht they came up with. If it's not the right one I'll be looking for the correct Bosch reference.~ About the fittings for the injectors, I'll try to find one locally. If I can't get one I'll ask you for one, thanks ! The PN for the injectors is the one I've got. Rui
Hey Rui, remember to take lots of pictures! And BTW, here is a schematic I drew to use a pair of relays to carry the window motor current rather than putting full current through the window switches. When I opened my failed switch the contacts were burned beyond operation. As the window friction increased the load on the circuit went up - as expected. I have three new switches and I don't intend to fry them. Merry Christmas! -rick, and family! Image Unavailable, Please Login
I've got the green ones from Bosch (3 430 210 606) and you are right, they are hard to get in! However, the larger o-ring is not available from Bosch or Ferrari. Would you have any source for that ? Thanks Rui
Thanks, Rick ! Excelent idea. I will do that when I get to the doors Merry Christmas and a Happy New Year ! Rui
I'm sorry, I'm missing something here....if the larger O-ring is harder to install, then WHY??? What's the benefit to a larger ring, that doesn't fit properly, than a smaller O-ring that does fit properly???
My "secret" to installing tight rubber hoses is I boil the end for a minute or so. They then will slide on a metal hose end easily with no lubricant needed. Would that be okay for the O rings as well? Ken
The green O-rings are suppossed to be better material, but I don't know if they are a different size or if they are just a harder material. Heating the O-ring in hot water would probably help, but there are two steps; first you have to put the O-ring on the injector then put the injector with the O-ring into the manifold. The black O-rings "pop" in pretty easily with a little oil... I would try to find them. Mark
okay now you guys have lost me. the CIS injectors don't use std. 'O' rings but a rubber seal that fills the 'cap' that threads into the manifold. i used the mercedes 450 ones but had to shave the OD down a bit. to remove you can either unthread the entire assymbly and dissasymble the injector and seal or pull out the injector and use a allen wrench to remove the rest. this would be for the CIS injectors, not the newer bosch pulsed motronic, those use 'O' rings.
http://rep.racepages.com/parts/racepages/wizard.jsp?year=1980&make=MB&model=450-SEL-003&category=C&part=Fuel%20Injector%20Seal&dp=false&showdc=true#top here's a pic, hope it works.
I've removed the injectors on cylinders 1 and 4 so that I would know what to expect. Here are my comments and questions: - I've disconnected both injectors and no gas came out. I mean not a single drop! I understand that could mean leaking injectors, bad accumulator or valve on the fuel pump, right ? The car is standing for a week - you really need to pull hard to get them out !!! - the old injectors are probably original,they are the steel ones and very oily (see picture). Is this normal or could it mean trouble?? - how on earth do I remove the seal that stays in the manifold? (see picture). There is some play with the injector in place, so I guess I'd better get new ones - the seal is NLA from Ferrari, but I believe it is the same as in the Mercedes 450 SEL (see link http://www.mercedes-benz-parts-direct.com/item-image.asp?imageUrl=http://12.153.160.115/webapp/wcs/stores/servlet/imc/images/full/1160780873MY.jpg ) - The spacers I need to be careful with are under the plenum or under the intake? I will probably remove both together, if possible. That would make cleaning everything much easier, as well as replacing the hoses and thermo time switch And that's about it for today Rui 88' 328 GTS - under surgery Image Unavailable, Please Login Image Unavailable, Please Login
Just wanted to thank everyone for their help. It's easy to remove them with the tool suggested. Here's a picture with the tool and parts necessary. You can see the old and new injector, o-rings, tool and part number. Rui Image Unavailable, Please Login
