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#1
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Hey guys need some #22 603 head prechamber help.
Ok so had my brother in law get this really nice w124 300D with a new #22 head on it. Well out of no where its got this fuel knock which come to find out ALL the prechambers were finger tight and the injectors were not tight either.
I was told by my favorite indy that alot of people forget they have to switch to the updated prechambers when they do the head swap and that if you dont the old ones which are a smaller size will fit but over time loosen up. So what i need to know is what is this correct prechamber part number & has anyone been through this???? Thanks alot guys! Der DieselKraut.
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Wie lange wird Ihr Auto leben? |
#2
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They don't have to be switched to the new style, mine was not when the #22 head was put on. I believe GSXR has told me that sometimes they leak if they are not updated. Someone with more knowledge will weigh in.
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous “Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss |
#3
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Anyone else?
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Wie lange wird Ihr Auto leben? |
#4
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The old chambers should not have fit properly, there's a step on the head that prevents seating. Although heads sold by Metric Motors were supposed to have been machined properly to allow either to fit.
I doubt a mechanic would have proceeded with assembly of a #22 head with the old PC's unless he was not aware of the compatibility problem. OTOH, the loose injectors might indicate someone was in a hurry to slap everything together and forgot to torque things down properly The headshop I use routinely bores the new 603 heads in this area. They said there are some Spanish made heads that were imported that needed this kind of mod to use the original PC's. This is what Metric Motors may have been referring to. Actually there is a long thread on this subject and will probably make you want to ask the seller's mechanic (if you can locate him!) what was (or wasn't) done: OM603 - big compression leak at injectors/prechambers
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#5
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It's easy to tell if you have the newer prechambers, the injectors will be on an angle. The older style has them facing almost straight up and down.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#6
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This image from gsxr's collection shows how older prechambers can be machined to fit #17 and later heads (including #22) -
http://www.w124performance.com/images/OM603_head_replacement/prechamber_mod2.jpg This should be cheaper than a new set of prechambers and injectors since old injectors won't screw into new prechambers. Cheaper also than pulling the head to trim the step dieseldiehard described. Inclined injectors have fine thread all the way to the firing end. Vertical injectors have coarse threads that end about 15mm above the firing end. To further Jason's point, if you can remove the head bolts without removing the injectors, you have vertical injectors. If the bolts contact the injectors as you remove them from the head, you have inclined injectors. Sixto 87 300D |
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