This may seem like a silly question but I have a friend who's 76 300D threw
a rod at 120,000k mi
They drive the car only 5K/yr and have it serviced religiously by MB only!
Is this just the luck of the draw or is
there some underlying problem with the crankshaft. Is it worth rebuilding
the engine or should the engine be
replaced? They are very attached to the car and would actually like to keep
it longer if possible.
Any thoughts or suggestions from this group? Thanks wolf
It's very unusual for the 5 cylinder Mercedes 617 engines to throw a connecting
rod. It's difficult to balance any 5 cylinder engine but Mercedes does a
pretty good job of balancing those engines at the factory. The connecting rod
bolts are 10 mm diameter which usually prevents them from breaking.
There is no special reason to think there was a problem with the crankshaft.
It sounds like your friend was just very unlucky. Perhaps, a rod nut cracked
or the rod itself. Rebuilding the engine may or may not be possible depending
on the amount of damage caused by the rod. Rebuilt engines are available from
Mercedes and aftermarket rebuilders like Metric Automotive. Used engines are
available from salvage yards. The problem is that a rebuilt engine will cost
more than the car is worth. A used salvage yard engine is one option. Another
option is simply buying another 300D. The 1985 model for example was a better
car, has a turbodiesel engine and many improvements. You can likely find one
of those cars for less than the cost of replacing the engine.
Why? Are you a W115 owner? The 617 turbodiesel engine lasts longer than the
non-turbo engine. I own cars with both engines. The engine oiling system is
superior in the later turbo engine.
A rebuilt $5,000 engine in a sub $2,000 car doesn't make a lot of sense to me.
Does the W115 chassis have a cult following? The W115 and the W123 chassis are
not that different. Tell us why the W115 is superior.
Well I cannot believe but my friends have decided to have the W115 rebuilt
to the tune of over 5K (rough estimate) the number 2 rod broke. Clearly does
not speak well for the W115 vs the W123.When does the 617 diesel start in
terms of production years? I would have said to junk the car since it is
almost 30 years old and has a lot of 30 year old rubber and plastic
degradation. Bur what the hey it is their choice and decision. Thanks for
all the good info. wolf
firstname.lastname@example.org (VCopelan) wrote in
I have owned and serviced both. The W114/115 series is the last and best
of the true Mercedes in it's class!
The W123 was the first of the "downhill" models. Clearly a conpromised
car in comparison with the former.
I haven't seen any concrete proof that the later engines outlast the
originals, let alone outperform them.
Nonsense. While the 115 had its plusses, wht 123 rusts less and has better
engines and safety features. There are tons of half-million mile 123 Diesels on
425 White Horse Pike
You really think the non-turbo 617 engine has the same performance as a
turbodiesel engine? Apparently, you have not driven a 1982 - 1985 300D
turbodiesel. Having driven both (my non turbo has 270,000 miles on it but the
engine was rebuilt at 208,000). The turbo car is much faster up the hills,
gets the same or better mileage and is quieter. On highways with many long
hill, the non turbo car can barely maintain 55 mph. Mercedes has gone downhill
but that was after the 123 chassis. The later 123 cars do everything the 115
chassis cars do but only better.
I'm not dreaming and you must really like to drive really slowly. What do you
consider a better balanced performer? Slower, more noise, less safe? I've
owned three 123 chassis cars. I gave one to a family member. Many mechanical
parts are interchangable between the W115 and W123 bodies. By 1985, Mercedes
had added insulation to the transmission tunnel and elsewhere to make the car
quieter. The rear axle ratio was changed to allow the engine to run a lower
rpm. Automatic seat belt tensioners were added to make the car safer in an
accident. My 1980 300CD is slower and makes more noise. It's much like a W115
chassis. The only significant difference between the W115 and the later W123
is the addition of more complex climate control systems in the later cars.
ok...i have followed this thread long enough and kept silent...
i own a 114, a 123 and a 201 for daily driving
let me tell you...i love them all...just in different ways...
the 114 for its simplicity...the 123 240d for it being a tank and letting me
add 300k mi to its chassis
and the 201 for it being my daily driver, now and taking the beat
they are all great in their own way, so why argue...
but let me tell you this...i feel safe in alle 3 of them although there is
22 years parting my 114 and my 201
oh and...there is a 2003 audi a6 wagon 2,5 tdi, a 99 golf4 vw 1,9 tdi and
there was a 97 jeep grand cherokee 5,2 also...but the most fun is the 69
thats the one that actually turns heads
No you're completely wrong once again. I'm not talking about the clutch in the
seatbelt mechanism which locks under acceleration of the belt. The later
Mercedes cars have a supplemental safety belt tensioner which uses a cable and
an electrically ignited chemical charge/gas piston to
remove all slack in the seat belts at the moment of impact. All 300D's don't
have the device.
So your saying that the W115 has the same climate control system as a W123
chassis? The W123 had three different systems. Actually four if you count the
bowden cable system in the 240. Tell me what was used in the W115?
And so there are no common parts between the W115 and W123 chassis? You are
kidding. Almost all the brake system is the same. The 617 engine is the same
as are so many other parts are in the two cars. Yes, the W115 does have a York
A/C compressor and the later cars have a Delco R4 but I don't like either
I've driven several W115 chassis cars. They are nice but to say they are the
last well made Mercedes is quite an overstatement. And since you seem to have
such limited knowledge about either chassis, you're hardly in a position to
render a meaningful opinion.
For what its worth, I have been advised by a repairer who does warranty work
that the W203 blows pistons if the car doesnt get a good workout. Something
like a long trip or a spin on the freeway.
5K per year seems like a very small amount of travel and I cant help
wondering if the same ethos applies.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.