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#1
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Are almost all 300D head gasket failures caused by overheating?
If one is to believe Kent Bergsma from MB Source, virtually all head gasket failures with our diesels can be traced to an engine overheat at some point...is that true? He sells a video on-demand I'm not sure is needed. Or can a gasket fail just due to our cars getting older, or due to something else?
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#2
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Overheating is probably the most common cause of blown gaskets, but they can fail randomly from age or usage too. Gasket failure isn't that common on the 61x's but it happens. Head gasket failure is probably more common on the 60x series engines since they use an aluminum head on iron block (causes scrubbing) and have a stupidly designed exposed oil gallery by Cylinder 1 in early head revisions.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#3
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I have scene head gaskets leak due to pitting caused by depletion of the rust prevention of the coolant (electrolysis?) and an article I read said that the while we don't think of it the heating and cooling of the parts causes movement due to expansion and contraction although the term scrubbing was not mentioned that is what is what I am guessing they were speaking of.
On Big Rig Diesel Truck Engines I have seen the occasional head bolts fail. So head bolts can fatigue and lose their elasticity and cause head gasket leaks. I have also seen one Diesel Head Gasket were the Injector spray (this was a direct injection engine) was not good and focused on part of the head gasket that burned through and leaked coolant.
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84 300D, 82 Volvo 244Gl Diesel |
#4
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I have scene head gaskets leak due to pitting caused by depletion of the rust prevention of the coolant (electrolysis?) and an article I read said that the while we don't think of it the heating and cooling of the parts causes movement due to expansion and contraction although the term scrubbing was not mentioned that is what is what I am guessing they were speaking of.
Also Cylinder heads and blocks can warp from normal use. If you look inside of cylinder heads and blocks the thickness of the metal is often not very evenly distributed. That means inside of say a block more metal might surround one side of a cylinder then the other side. That means heating and cooling cycles are going to stress the block and distort slightly. The same with the inside of the cylinder head. On Big Rig Diesel Truck Engines I have seen the occasional head bolts fail. So head bolts can fatigue and lose their elasticity and cause head gasket leaks. I have also seen one Diesel Head Gasket were the Injector spray (this was a direct injection engine) was not good and focused on part of the head gasket that burned through and leaked coolant. Getting back to Kent. If you own a Car long enough thermostats sometimes fail to open and fan belts break and you can experience coolant leaks that over heat your engine but don't do obvious damage but in particular stress the cylinder head. So an accumulation of small stuff and time can do in a head gasket. The pic is from a gasoline engine of mine. The threads of the Head Bolts on the Engine are exposed to the coolant and over Time the Coolant seeped up past the thread sealant and into and next to the head gasket and corroded under the sealing area and got into the combustion chamber. Notice that the head surface has been cleaned and some surfacing done to it but the pitting is still there. There was also another area of pitting on the other head that was not as deep.
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84 300D, 82 Volvo 244Gl Diesel Last edited by Diesel911; 05-14-2019 at 01:17 AM. |
#5
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Head gaskets can rot with age. The 616 and 617s seem to have head gaskets that have aged well so far in general. I have no way of being certain. Still I would suspect that three of my old 616 qnd 617 engines still have their original head gaskets.
Cast iron head and block really limit the dissimilar metals expansion issue effect. |
#6
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The 617 turbo seems to wallow out head gaskets before 300K miles, leading to leakage. A lot of extra heat from the turbo probably makes things move around more.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#7
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Kent's stuff can be detailed and useful, especially if you need a complete step by step on a repair. I think I may have got the booklets for 61x valve guide seals, and the 61x front main seal and they were pleasantly complete.
Some of his stuff is just trying to find out how many ways he can pitch lubro moly diesel purge. Beyond supporting the uncontroversial idea that head gasket failures probably traceable to engine overheats, I'd hope a related video went into detail on cooling system maintenance. I'm betting 9/10 he pitches a citrus flush kit and instructions in the video.
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there? |
#8
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My favorite video from Uncle Kent is still the one where he says off brand "hi-temp" vegetable oil fixes low compression.
Shark jumped, in my book.
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RenaissanceMan Labs: where the future is being made today. Garage: 2017 Chevy Colorado Diesel (nanny state emissions) 2005 Volvo S40 T5 AWD, 77k 1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg 1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg WARNING: this post may contain dangerous free thinking. |
#9
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Quote:
I'll quote myself from when this came up a year or so back. Quote:
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Onus probandi incumbit ei qui dicit, non ei qui negat I recondition w123/w126/w124/w140/r107/r129/ steering boxes! 1984 300D "Elsa" odo reset 6/2011 147k 1983 300TD "Mitzi" ~268k OM603 powered 1995 E300 "Adelheid" 262k [Sold] |
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