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+--- Thread: Prechambers wont stop leaking (/showthread.php?tid=6785)
Prechambers wont stop leaking - Whizbang - 10-02-2015
So i've been trying to track down this perpetual "tick" noise for some time now. I've found it be somewhat like an exhaust leak but fast and rpm dependent. I did the soapy water test and sure even a few prechambers were bubbling. I ordered the tool from mercedes source and spent a few hours to retorque the lock nut and replace the injector heat shields.
Two of the three leakers had some movement before being torqued. but instead of being fixed, one is just worse now and bubbles pretty good. So doesn't imply i need to take apart the prechambers, clean them, and replace the sealing ring?
RE: Prechambers wont stop leaking - barrote - 10-03-2015
hehe, that is not so easy....
first u have to remove the precup , clean the seat and install them again. tq should be something around 100n to 130n.
the shields dont need to be replaced although care should be used when installing them. right side and clean. tq for injector is 50n.
The precups dont have seals. to remove them u seed and impact extractor , special tool.
regards and good luck withit.
RE: Prechambers wont stop leaking - kestreltom - 10-07-2015
(10-02-2015, 09:42 PM)Whizbang So i've been trying to track down this perpetual "tick" noise for some time now. I've found it be somewhat like an exhaust leak but fast and rpm dependent. I did the soapy water test and sure even a few prechambers were bubbling. I ordered the tool from mercedes source and spent a few hours to retorque the lock nut and replace the injector heat shields.
Two of the three leakers had some movement before being torqued. but instead of being fixed, one is just worse now and bubbles pretty good. So doesn't imply i need to take apart the prechambers, clean them, and replace the sealing ring?
You didn't say which car...
Tick.. tick... tick sound can can be a lot of things. I would start with the easy stuff, such a diesel purge. Make sure the valves are adjusted...
On my '84 300D, I had some bubbling and I wanted to open up the precup holes anyway. I used a special wrench and puller to remove the precups (don't forget the glowplugs!) and found puffy carbon buildup on a few of the seal rings under the lip of the precup.
![[Image: uT-PsjnT3FkB57V0HC4gOIW-OYfoCVlxn9X8JxT_...55-h512-no]](https://lh3.googleusercontent.com/uT-PsjnT3FkB57V0HC4gOIW-OYfoCVlxn9X8JxT_4GVbKWMo9Cd53gZkocdzR5Z4ZCz_gzf61d4wMN_b0lEX6f7LtPIu6nRDrJocPEgUYyk1KDJCXlYCH7EzvIcAkSrw5qiJWU02ANlx88vl4uH4TvC8Tu_LKU_GVD2zCUhQSc6uVwOlO_-FfBfZ2aO9W8M8KJpG0iDgdg5MK4ayWnqGbPmuapG64gsOKBtH8RUSkigTpf5vQ7wiUAU1gUU7G2gwi9Lr0xNR7sDImGecQTS3MfqID2jiOlLJHvLlUb_ql5lOtcCsIJbdsZSRCQz6JdPd38dMTP7YCc0mPxUEH7QC875ewpf_674ifiO5V3YDqSWQ0HlNp0Zm67kWZmvyu-MyLAqQP5KNFQA0qdZjDGiPJMYx-2tR7NMoLipGlrNDoK067Yus12tlXJfeas4rRfJX8OrleOlWKbEzykcVmmnf7I3NqhI80SaKK26G4NXk00Q2OtOHgrlxWhMcPK2fx8BuJW_LpOIVXjqNzYuLtYStjmgPBT4qomdper-C2XDgtLA=w855-h512-no)
So I cleaned them up, put it all back together, and re-torqued to factory specs and the problem went away. You cannot get the proper torque on these without the proper tool... in fact you will probably damage the ring/nut and have a leak as well.
RE: Prechambers wont stop leaking - Whizbang - 10-07-2015
Its on ann87 om603. I have the special tool to torque the nut. Im waiting for this weekend to get them out.
RE: Prechambers wont stop leaking - kestreltom - 10-08-2015
Good luck then!
ps. Don't forget to remove the glowplugs first and ream the holes.