reasons for bearing failure? - Page 2 - PeachParts Mercedes-Benz Forum

pawoSD · #16 12-13-2007, 01:57 PM

Quote:

Originally Posted by JimmyL

He is certainly a good influence on his son, based on this and your posting above.....

I hope and pray my son doesn't do such stupid things!

He's German.

Misses the autobahn.......we had a 220cdi up to 155mph (limiter) when we were there a few years ago.

Poor car, it was running some high rpms...

I rarely go that fast, I usually just keep up with traffic here in MI, which was averaging 86mph yesterday in the RIGHT lane.

I was still being passed on the left by SUV's! People are crazy.

I only go fast if I am by myself on a huge open stretch.

Skid Row Joe · #17 12-13-2007, 02:50 PM

Quote:

Originally Posted by Hatterasguy

Pushing old engines to their limits can cause things to fail. Old stuff doesn't like to be pushed, do it at your own risk.

However the bearing was probably already on its way out, for what reason who knows. Slight factory defect; no oil changes in the cars past. Maybe when it was newer it was ran without oil for a bit, who knows.

Since they're running aged equipment "flat-out" all the time, (which is probably untrue) running 105 - 155 m.p.h., nature or law enforcement will take them out anyway.

pawoSD · #18 12-13-2007, 03:00 PM

I run mine to top speed maybe a few miles maybe 1 in 15 drives on the freeway. The way I see it, is that if the engine is that close to failure, I'd rather have it blow doing that than when I am hundreds of miles from home. If it fails it would have anyways.

vegburner · #19 12-13-2007, 03:08 PM

The engine looks pretty clean on the inside, at least so far. I'll be doing more inspection and would like to know what to look for. There's no coking or sludge that I've found. There are fragments of bearing in the pan, as would be expected. The pistons looks good. The main bearings look good. The valves look good. What would I look for in the oil pump?

r

pawoSD · #20 12-13-2007, 03:51 PM

Quote:

Originally Posted by vegburner

The engine looks pretty clean on the inside, at least so far. I'll be doing more inspection and would like to know what to look for. There's no coking or sludge that I've found. There are fragments of bearing in the pan, as would be expected. The pistons looks good. The main bearings look good. The valves look good. What would I look for in the oil pump?

r

Most likely any fragments would be caught in the intake strainer/screen of the oil pump. Check that first.

vegburner · #21 12-13-2007, 04:20 PM

Yes, there are bearing fragments in the oil pump intake screen. What's involved in checking the internal working of the pump?

t walgamuth · #22 12-13-2007, 05:04 PM

Remove pump, disassemble, examine parts. I would have a professional machinist look at it, myself.

If the motor is sound a high speed run should not damage it. If there is an unsound part stressing it out for a couple of miles will be more likely to cause a failure.

I spun a bearing once in my 63 valient slant six.....after I did an amature rebuild....(replace bearings with standard, reassemble). Problem was I nicked a bearing with a rod bolt while assembling the motor.

Tom W

charmalu · #23 12-13-2007, 10:57 PM

PAWOSD. 86 mph in the right lane. HMMM what I see on the weather
reports here, you guys are up to your door handles in snow and ice .
kind of pushing it a little.

If these engines can go 500000 miles (read it on e-bay) or is it the
million mile ? then at 200,000 mi this isn`t an aged engine, just getting
broken in (heard it on e-bay).

Any mechanical device is only as reliable as the weakest part. and the
maintenance that went into it. none of us on the forum probably bought
one of these MB new. and we are riding out what little is left from earlier
abuses and neglect. like the horse, rode hard and put away wet.

I don`t push my vehicles to the limit, whats the purpose? just shortens
the life of the componets. cost enough to maintain them.

my 2 cnts worth, on my way to 1,000,000 mi

.

Charlie

pawoSD · #24 12-13-2007, 11:26 PM

I don't know why they keep saying we have all this snow.....we've gotten maybe 4-6" all season, and just about none for the past week or so. Its completely dry here...and 35F outside.

The forecast claims we're to get more snow.....but I've yet to see any....the radar is completely clear over the whole state. Roads are dry, so we can drive fast in that Michigan tradition. Since we have practically no state troopers on the freeways, its a free for all.

Then again, we go just about that fast when its snowing real hard too.

The weak people end up in the ditch, while the strong keep going.

Skid Row Joe · #25 12-13-2007, 11:43 PM

Quote:

Originally Posted by pawoSD

I usually just keep up with traffic here in MI, which was averaging 86mph yesterday in the RIGHT lane.

--What a load of CRAP!

pawoSD · #26 12-13-2007, 11:55 PM

You're pretty far away there in Texas....so how exactly would you know?

It wasn't 86 ALL the time, but MOST people were going at least 78....with periods of 85+ I did go 85+ for over half of my trip yesterday, so I'd call that fast.

JimmyL · #27 12-14-2007, 12:04 AM

Quote:

Originally Posted by Skid Row Joe

--What a load of CRAP!

Back from time-out and already laying it on thick again eh?

lietuviai · #28 12-14-2007, 12:06 AM

My 300D's original engine also had damaged crank bearings and crank journals. The bearings looked like metal potato chips.

There were metal bits in the oil pump screen and some silvery sludge in the pan.
Reading a reply here about the oil cooler being impossible to clean, would it be advisable to replace the cooler because of the bearing fragment contamination?

Chas H · #29 12-14-2007, 12:10 AM

Quote:

Originally Posted by lietuviai

Reading a reply here about the oil cooler being impossible to clean, would it be advisable to replace the cooler because of the bearing fragment contamination?

If any widespread contamination is found, it surely will be in the oil cooler too. It would be wise to replace the cooler.

Skid Row Joe · #30 12-14-2007, 12:18 AM

Quote:

Originally Posted by pawoSD

It wasn't 86 ALL the time, but MOST people were going at least 78....with periods of 85+ I did go 85+ for over half of my trip yesterday, so I'd call that fast.

So, now you admit "averaging 86" was....."ALL B.S."

Gee, what a surprise...........