OM606 Prechamber combustion leak
OM606 Prechamber combustion leak
My name is Mark, and I'm new to the STD group, but have been wrenching on Benz's since the early '70s. I've searched various boards, and have only seen this mentioned once, but no resolution was ever posted.
The patient is a '95 OM606 NA. It's chuffing combustion gas around #6, and I haven't been into the 606 that deep yet, and don't have the prechamber serrated lock ring tool.
A question, if I may.
I've seen this mentioned regarding 602s, but not the 606 engine. (I've searched the threads to no avail..)
Would this typically respond to re-torquing, or is it a symptom of something deeper, i.e. should I pull the glowplug and prechamber, clean and reassemble with a new heat shield? My understanding is that there is no sealing ring under the Prechamber unless the head has been machined.
Does this typically indicate a bad heat shield, cracked prechamber, or what the heck?
The car has almost 260K and has never been apart, as far as I know. I was thinking about pulling and cleaning all of the injectors, balancing pop pressures, etc, but I run fuel additives and it runs great.
Mileage runs from 37 when it's hot out, to 30-32 this time of year.
Any BTDTs would be appreciated.
I was planning on doing a turbo conversion of the NA engine. I already have an OM603 turbo injection pump, and am looking for an OM606 turbo exhaust manifold and turbo, if you happen to know of any.. I was hoping to hold off on the injector rebuilds until I installed the turbo setup, understanding the pop pressure would have to be adjusted to turbo specs.
Best regards,
Mark
Greetings,
My name is Mark, and I'm new to the STD group, but have been wrenching on Benz's since the early '70s. I've searched various boards, and have only seen this mentioned once, but no resolution was ever posted.
The patient is a '95 OM606 NA. It's chuffing combustion gas around #6, and I haven't been into the 606 that deep yet, and don't have the prechamber serrated lock ring tool.
A question, if I may.
I've seen this mentioned regarding 602s, but not the 606 engine. (I've searched the threads to no avail..)
Would this typically respond to re-torquing, or is it a symptom of something deeper, i.e. should I pull the glowplug and prechamber, clean and reassemble with a new heat shield? My understanding is that there is no sealing ring under the Prechamber unless the head has been machined.
Does this typically indicate a bad heat shield, cracked prechamber, or what the heck?
The car has almost 260K and has never been apart, as far as I know. I was thinking about pulling and cleaning all of the injectors, balancing pop pressures, etc, but I run fuel additives and it runs great.
Mileage runs from 37 when it's hot out, to 30-32 this time of year.
Any BTDTs would be appreciated.
I was planning on doing a turbo conversion of the NA engine. I already have an OM603 turbo injection pump, and am looking for an OM606 turbo exhaust manifold and turbo, if you happen to know of any.. I was hoping to hold off on the injector rebuilds until I installed the turbo setup, understanding the pop pressure would have to be adjusted to turbo specs.
Best regards,
Mark
Stevo-trendy
03-07-2014, 03:56 PM #2I would pull the injectors recon them & fit new injector washers & new leak off pipe
check for cracks, damage to cyl head, etc..
(03-07-2014, 11:35 AM)mwoodland Greetings,
My name is Mark, and I'm new to the STD group, but have been wrenching on Benz's since the early '70s. I've searched various boards, and have only seen this mentioned once, but no resolution was ever posted.
The patient is a '95 OM606 NA. It's chuffing combustion gas around #6, and I haven't been into the 606 that deep yet, and don't have the prechamber serrated lock ring tool.
A question, if I may.
I've seen this mentioned regarding 602s, but not the 606 engine. (I've searched the threads to no avail..)
Would this typically respond to re-torquing, or is it a symptom of something deeper, i.e. should I pull the glowplug and prechamber, clean and reassemble with a new heat shield? My understanding is that there is no sealing ring under the Prechamber unless the head has been machined.
Does this typically indicate a bad heat shield, cracked prechamber, or what the heck?
The car has almost 260K and has never been apart, as far as I know. I was thinking about pulling and cleaning all of the injectors, balancing pop pressures, etc, but I run fuel additives and it runs great.
Mileage runs from 37 when it's hot out, to 30-32 this time of year.
Any BTDTs would be appreciated.
I was planning on doing a turbo conversion of the NA engine. I already have an OM603 turbo injection pump, and am looking for an OM606 turbo exhaust manifold and turbo, if you happen to know of any.. I was hoping to hold off on the injector rebuilds until I installed the turbo setup, understanding the pop pressure would have to be adjusted to turbo specs.
Best regards,
Mark
Austincarnut
03-07-2014, 08:02 PM #3pull the prechamber, clean and reseal
check for cracks, damage to cyl head, etc..
(03-07-2014, 11:35 AM)mwoodland Greetings,
My name is Mark, and I'm new to the STD group, but have been wrenching on Benz's since the early '70s. I've searched various boards, and have only seen this mentioned once, but no resolution was ever posted.
The patient is a '95 OM606 NA. It's chuffing combustion gas around #6, and I haven't been into the 606 that deep yet, and don't have the prechamber serrated lock ring tool.
A question, if I may.
I've seen this mentioned regarding 602s, but not the 606 engine. (I've searched the threads to no avail..)
Would this typically respond to re-torquing, or is it a symptom of something deeper, i.e. should I pull the glowplug and prechamber, clean and reassemble with a new heat shield? My understanding is that there is no sealing ring under the Prechamber unless the head has been machined.
Does this typically indicate a bad heat shield, cracked prechamber, or what the heck?
The car has almost 260K and has never been apart, as far as I know. I was thinking about pulling and cleaning all of the injectors, balancing pop pressures, etc, but I run fuel additives and it runs great.
Mileage runs from 37 when it's hot out, to 30-32 this time of year.
Any BTDTs would be appreciated.
I was planning on doing a turbo conversion of the NA engine. I already have an OM603 turbo injection pump, and am looking for an OM606 turbo exhaust manifold and turbo, if you happen to know of any.. I was hoping to hold off on the injector rebuilds until I installed the turbo setup, understanding the pop pressure would have to be adjusted to turbo specs.
Best regards,
Mark
PM me any time.
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
I agree with the above suggestions and have a source for the stock turbo parts that you're looking for.
PM me any time.
'05 Jeep Liberty CRD - 160k
'06.5 VW Jetta TDI - 230k
'82 MB 300TD - 116k (motor going to raysorenson)
'81 MB 300TD - 195k (parting out)
'71 Jeep DJ5 - diesel conversion project
(03-12-2014, 09:25 AM)mwoodland So, noone has ever seen this condition?
I've searched quite a bit, and the only instance I've seen never got a reply.
I'm in the process of tooling up for the project, but would like to know what I might expect.
Sure, this happens from time to time. You just need to take it apart and see whats going on. Most likely you'll need to clean it all up ( glass bead or media blast the prechamber ) and thoroughly check the cylinder head for damage due to the combustion leak. If all is well reassemble and it should be fine. If there is any burning or damage to the seat area of the cylinder head you'll need to take care of that ( repair shim 6010170460 .3mm 6010170260 .6mm 6010170360 1.0mm)
Duncansport
03-12-2014, 10:29 AM #6(03-12-2014, 09:25 AM)mwoodland So, noone has ever seen this condition?
I've searched quite a bit, and the only instance I've seen never got a reply.
I'm in the process of tooling up for the project, but would like to know what I might expect.
Sure, this happens from time to time. You just need to take it apart and see whats going on. Most likely you'll need to clean it all up ( glass bead or media blast the prechamber ) and thoroughly check the cylinder head for damage due to the combustion leak. If all is well reassemble and it should be fine. If there is any burning or damage to the seat area of the cylinder head you'll need to take care of that ( repair shim 6010170460 .3mm 6010170260 .6mm 6010170360 1.0mm)
I can't post pictures at the moment, but hotspur pretty clear shots.
I pulled #6 prechamber and cleaned everything. It looked like the heat shield seat was slightly galled, so I fabricated a tool from an old seal and lapped the seat with 400 wet. The seat cleaned up, but the galling now looks more like it was burned. Should I run it or replace the PC?
I can't post pictures at the moment, but hotspur pretty clear shots.
![[Image: image.jpg]](http://s983.photobucket.com/user/dcmew074/media/Mobile%20Uploads/image.jpg.html)
[/img]Bottom of heat shield
![[Image: image-1.jpg]](http://s983.photobucket.com/user/dcmew074/media/Mobile%20Uploads/image-1.jpg.html)
Burned prechamber heat shield "seat".
![[Image: image-2.jpg]](http://s983.photobucket.com/user/dcmew074/media/Mobile%20Uploads/image-2.jpg.html)
Prechamber after lapping
Can this prechamber be saved or should I replace it?
The seat cleaned up but if you can zoom in the metal looks fatigued by the heat.
Any advice would be appreciated.
[img][/img]
Bottom of heat shield
Burned prechamber heat shield "seat".
Prechamber after lapping
Can this prechamber be saved or should I replace it?
The seat cleaned up but if you can zoom in the metal looks fatigued by the heat.
Any advice would be appreciated.
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