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+--- Thread: om603.970 (/showthread.php?tid=777)
om603.970 - oel_brenner - 10-20-2009
rod bender.. hopefully not rod bent..
91 350SDL I just bought.. replaced lift pump, and got the car running..
hearing a knock, thought it was a sticky lifter at first but it sounds too knock like and less tick like (if that makes any sense..)
check out this video..
http://www.youtube.com/watch?v=QevTR1_PRow
thoughts ?
RE: om603.970 - ForcedInduction - 10-20-2009
Sounds like combustion.
Synthetic oil and a tank of biodiesel should cover both the lifter and combustion possibilities.
RE: om603.970 - SixSpeed - 10-20-2009
Personally, in my expert opinion...
The unfinished bodywork on the Unimog in the driveway is what causing it. For sure.
RE: om603.970 - oel_brenner - 11-08-2009
definitely combustion... moved the injector of suspect cylinder to a different cylinder, and the noise followed the injector. I guess its time to build a pop-tester.
once again forced.. you are the man..
and no, SixSpeed... its not the unimog in the driveway.. but that gasser sure stinks up the place!
whatever happened to your "SixSpeed" ?
RE: om603.970 - SixSpeed - 11-08-2009
(11-08-2009, 04:02 PM)oel_brenner and no, SixSpeed... its not the unimog in the driveway.. but that gasser sure stinks up the place!
whatever happened to your "SixSpeed" ?
I got your stink RIGHT HERE.
I still have a SixSpeed...in fact I have two. The Gasser 'Mog and the 514i.
RE: om603.970 - oel_brenner - 11-28-2009
well, replaced the suspect injector with a new one
noise remains.
thought for sure its a lifter, so pulled the cam and put in 12 brand new units.
noise remains.
loosening each injector in turn, reveals its #6 cylinder (rearmost)
when that cylinder is not getting fuel the noise goes away
so that means its combustion still ( but not an injector )
or that connecting rod is toast, when removing fuel the piston gets "dragged" down vs. pushed down with combustion.
but on the other hand when revved to high-rpm, the noise can still be heard as the engine spins back down to idle, and under this condition the governor should have removed all fuel..
the noise is very mechanical in nature, exists at all RPM ranges including idle, although idle and deceleration produce the least noise
thoughts ?
RE: om603.970 - Tymbrymi - 11-28-2009
(11-28-2009, 10:28 AM)oel_brenner the noise is very mechanical in nature, exists at all RPM ranges including idle, although idle and deceleration produce the least noise
My '79 SD sounds exactly like this. How's your oil pressure? I thought I spun a rod bearing, but my oil pressure is still excellent.
Only difference is that I can't isolate mine to a cylinder at idle, and occasionally the engine will run perfectly smooth, and other times it will only run on four cylinders. 
Here are some videos...http://video.google.com/videoplay?docid=-4524880834772559028#
http://video.google.com/videoplay?docid=-8331401484715958966#
http://video.google.com/videoplay?docid=-4608337093365325271#
RE: om603.970 - oel_brenner - 11-28-2009
(11-28-2009, 12:51 PM)Tymbrymi How's your oil pressure? I thought I spun a rod bearing,
car runs perfect.. if it were not for the noise, you could not tell anything is wrong.
good pol pressure
no smoke, good even power from idle on up...
RE: om603.970 - ForcedInduction - 11-28-2009
(11-28-2009, 04:47 PM)oel_brenner car runs perfect.. if it were not for the noise, you could not tell anything is wrong.
My 240 is exactly the same way. If it weren't for the noise on the #1 cylinder it would be a fantastic engine.
I've been driving it for the last 5 years expecting it to "go" at any time. Its the reason I bought a second car, when it blows I won't be left without transportation.
RE: om603.970 - oel_brenner - 11-28-2009
fresh video:
http://www.youtube.com/watch?v=wxBxpMakelE
http://www.youtube.com/watch?v=wxBxpMakelE
RE: om603.970 - SixSpeed - 11-28-2009
(11-28-2009, 05:51 PM)oel_brenner fresh video:
http://www.youtube.com/watch?v=wxBxpMakelE
http://www.youtube.com/watch?v=wxBxpMakelE
Needs washer fluid.
EDIT: HA YOU THOUGHT SOMEONE HELPFUL RESPONDED.
Just me.
RE: om603.970 - Tymbrymi - 11-28-2009
It runs exactly like my SD does (minus the occasional 4 out of 5 problem I have... hopefully that doesn't show up with you!). I found another video of my car as well.
http://www.youtube.com/watch?v=nrGJ4TI4cwQ
When I checked the rod bearing a while back, I don't remember if the play was in the "bad" direction or not. Also, I didn't get a second opinion on the bottom of the piston. One of these days I'll do that again and get a good picture.
Edit: I agree about the injectors... with no fuel I don't see how it could be injectors.
RE: om603.970 - oel_brenner - 12-01-2009
so, to determine if its rod knock on this car, I need to drop the oil pan, and to do that the engine has to be raised up a bunch to get the pan out..
so I started thinking.. Ill just pull the engine out and put in a 3.0L 603.96x engine and be done with it..
problem is, Im fresh out of OM603.96x engines at the moment..
craigslist ?
oh, a 1987 W126 300SDL?
$899 runs good ?
I'll take it.. (thanks to SixSpeed for the help getting it home)
now I have two W126 gen2 long wheel base diesel cars...
so I think Ill swap the 3.0L engine into the 91
grab a bunch of spare 126 parts off it, and put the rest into my favorite euro junkyard.
and the word on the street is that the latest version of the 3.5L con-rods from MB are good and don't bend.. so maybe Ill rebuild the bottom end of the 3.5L and put that engine into my W124 with my bigass Holset HE351Ve attached to it.
pics tomorrow, and time to update the signature line.. again...
RE: om603.970 - ForcedInduction - 12-01-2009
I'd put that 3.5L as-is into whatever it will fall into the easiest and crank the piss out of it until I find its breaking point.
If (when) it throws a rod, you'll still have that good 22 head to use on the .96.
RE: om603.970 - oel_brenner - 12-02-2009
(12-01-2009, 11:23 PM)ForcedInduction I'd put that 3.5L as-is into whatever it will fall into the easiest and crank the piss out of it until I find its breaking point.
If (when) it throws a rod, you'll still have that good 22 head to use on the .96.
I just don't think I can do it... I was driving it around the other day, and the mechanical engineer inside me was screaming:
STOP!!! this engine HAS A HORRIBLE PROBLEM!! SHUT IT OFF NOW!! It was literally painful to drive it around.
I hear what you are saying though, but assuming the new MB rods are OK the extra .5L will be nice on the bigassturbo W124, so I dont want to trash the block/crank/whatever-else-breaks when the rod goes away