Mercedes Overland Building/Tuning

[charlieaarons]

Top hp rating for OM366LA in Unimog is 240hp at 24-2600. I wouldn’t exceed that, and then only if it has all the necessary bits like oil spray nozzles etc etc. And pyrometer (EGT).

 

[RoamIt]

Will be the updated version of my electrical series: Watts up!, Charging up!, Doubling up! and now, Getting the lead out. You can guess the subjects or see the old slides here: https://diplostrat.net/documents/

Perfect, I am electrically challenged. On my current Porsche build , I am using wiring that is labeled every 3 inches of what it goes to. For example, if a line is for the front right headlight it says 'front right headlight' every few inches. Makes wiring and trouble shooting SO much easier. I may try to do that with the MB.

 

[mog]

There's a question if it has the front locker or not.

The torque value seems very low too me, after reading about challenges getting up big hills,

A photo of the dash (locked indicator light) and/or the selector is the quickest way to confirm a front (and/or rear) locker.

Learn to live with <65 mph cruising speed and 35-45 mph hill speed, no amount of 'tweeting' is going to change that.

 

[RoamIt]

Well, I received a couple more pic's this morning and a little more info. It does indeed have a front locker, confirmed it's an Allison trans, and it has a Webasto heater for the cab.

Things are looking good for this deal.

 

[Joe917]

Well, I received a couple more pic's this morning and a little more info. It does indeed have a front locker, confirmed it's an Allison trans, and it has a Webasto heater for the cab.

Things are looking good for this deal.

Congratulations, all 3 diff locks! no PTO?

 

[DiploStrat]

Looking at the pump, unless it is electrical because of the extreme aft position, there has to be a PTO.


Would never argue with Dr. Arrons, but for world wide tourism, including dirty roads, a 385/65x22.5R will work and will probably give you around 60mph. This based on my exprience. And this is tourism, not mud chugging. For deep mud, you may indeed need a bead lock or similar.

 

[RoamIt]

I didn't ask about a PTO. What would I use it for? Can you use it as a winch?

Does anyone know what the 4th, larger switch is for? I translated it and it says only use the switch when the engine is at a standstill. It has a hill icon on it, is this the switch for the 2 speed transfer case?

 

[Joe917]

I didn't ask about a PTO. What would I use it for? Can you use it as a winch?

Does anyone know what the 4th, larger switch is for? I translated it and it says only use the switch when the engine is at a standstill. It has a hill icon on it, is this the switch for the 2 speed transfer case?

Large switch is transfer case high low.
As Diplostrat says it almost certainly has a PTO. PTO will run hydraulics. You can get hydraulic winches.

 

[RoamIt]

Great, that's what I thought the switch/PTO was for. But I'm not afraid to ask questions about what may be obvious to you guys.

 

[charlieaarons]

Looking at the pump, unless it is electrical because of the extreme aft position, there has to be a PTO.


Would never argue with Dr. Arrons, but for world wide tourism, including dirty roads, a 385/65x22.5R will work and will probably give you around 60mph. This based on my exprience. And this is tourism, not mud chugging. For deep mud, you may indeed need a bead lock or similar.

A 385/65R22.5 is the easiest big size to find worldwide. But it’s about 42” in diameter and top speed depends on gearing with the limiting factor of speed rating. Most 385s have 62-65mph ratings or even faster, depending on tread design. 425s and 445s are taller, up to nearly 46”.
Got to multiply revs/mile by axle ratio and top gear ratio and compare to engine ratings.
And I totally agree that 385s are optimal for all made (paved and unpaved) roads and worldwide replacement.

 

[Sitec]

It looks like it'll have the MK/SK dash as that's the later switchgear for the diff locks like ours. Our PTO (crane hydraulics) was an aftermarket fit, and had an independant switch mounted under the dashboard. The actual PTO unit was a heavy lump including a hydraulic pump. I couldnt see any real use for it other than jacking legs, but then you need the legs, an oil reservoir etc and it all adds unnecessary weight. If I ever feel the need to fit a hydraulic winch, it'll go back on!

 

[Geo.Lander]

Congratulations, all 3 diff locks! no PTO?

Everyone including myself is pretty jealous of your factory front locker @RoamIt! Ask away, I get the crown for most stupid questions on this forum anyway ?

 

[Geo.Lander]

Speaking of PTO, what are the best use cases apart from the high powered coffee grinders and hydraulics? Has anyone gone down the the electrical generator route?

 

[DiploStrat]

A 385/65R22.5 is the easiest big size to find worldwide. But it’s about 42” in diameter and top speed depends on gearing with the limiting factor of speed rating. Most 385s have 62-65mph ratings or even faster, depending on tread design. 425s and 445s are taller, up to nearly 46”.
Got to multiply revs/mile by axle ratio and top gear ratio and compare to engine ratings.
And I totally agree that 385s are optimal for all made (paved and unpaved) roads and worldwide replacement.

Tanx! I just wish that:

-- The rims had safety beads, and,

-- The tires themselves had a lower ply rating. They are stiff and stiff ain't good on washboard or soft stuff.

 

[RoamIt]

Great questions and great answer!
I to am wondering about the possibilities. I've never had to self recover (because I drove a LC 100 series, of course ) But I imagine you could set a system to run tow line out the front or back from a hydraulic winch(?)

My pack list includes a small motorcycle, and at least one of my pedal bikes. I want a garage, but figure something is going to have to hang off the back, I could run the winch line to a rear lift mechanism as well I believe. If it could replace 2 or 3 other winches, it may be worth it's weight.