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  #1  
Old 05-23-2009, 08:37 PM
Dieselkraut23's Avatar
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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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Old 05-23-2009, 08:45 PM
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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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Old 05-24-2009, 12:06 AM
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Anyone else?
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Old 05-24-2009, 11:58 AM
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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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Old 05-24-2009, 09:09 PM
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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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Old 05-24-2009, 09:43 PM
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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.

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87 300D

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