WANTED Expansion Tank 1245001549

[lzamora]

Hi guys,

I'm coming in a few years later on searching for parts and a lot are NLA.... Tried everywhere without success... Does someone here has an Expansion Tank 1245001549 laying around that is willing to part with please???

Picture for reference.

Thanks a lot!!!!!!

PD. Does anyone knows why all the MB sites when looking for 124 parts they throw you to 210 catalog?

 

[emerydc8]

That’s horrible that even this part is discontinued. I just bought one last year.

 

[lzamora]

That’s horrible that even this part is discontinued. I just bought one last year.

Nooooo way!!!!! I've been searching alll over and shows as NLA... I'm curios if the w126 will fit it? Because that one is available indeed.

Anyone has information or has tried it before?

 

[gsxr]

126 chassis reservoir almost certainly will not fit. There may be some aftermarket (Febi) tanks for other 124 chassis which MIGHT work. Maybe. I don't know, I've never tried.

 

[lowman]

A standard w124 tank with partsnumber 1245001749 will fit with some minor mods.
Not ideal,but better than no tank if not available .

 

[gsxr]

A standard w124 tank with partsnumber 1245001749 will fit with some minor mods.
Not ideal,but better than no tank if not available .

Tank 124-500-17-49 is for most 124 chassis with M103 engine. The location of the sensor & hose connection are slightly different. Looks like this may still be available per the MB Classic site, although some vendors show "NLA". I wonder if this had been NLA but came back to life? Some sellers on eBay are asking $250-$350 but MSRP in USA is only $53.

https://parts.mbofcovington.com/oem-parts/mercedes-benz-container-1245001749

 

[anderzen]

Hello,

Just wanted to let you guys know, the Dorman part# 603-643 is actually a much closer match to the original even though in display pictures it shows like the incorrect one shown above in @gsxr 's post.. I'll add a picture in the morning to show once installed, the level sensor and outlet port are in correct orientation, only the bleed port and vent port are different but totally usable...

Cheers

 

[gsxr]

I found photos of the Dorman here... looks identical to the M103 tank? If so, might as well get the OE tank for the same price.

 

[anderzen]

I got something different for sure… don’t know if they sent the wrong part but was ordered off Amazon under that Dorman part number. The bleed port hose has plenty of length to comfortably reach the new location on new part

 

[anderzen]

Welp install was great, fits perfectly, I did change out bleed hoses for silicone with a bit more length to be safe, stoked on it for $30! Took pics of what part numbers are on it, I’ve found 90% Dorman parts end up being German made or exact OEM in last few years…

 

[Phoenix127]

Your picture looks to me like a 124-500-1349 which fits E320 models according to what I can tell online. It would be wonderful if these are cross compatible. Can anyone confirm?

 

[gerryvz]

Your picture looks to me like a 124-500-1349 which fits E320 models according to what I can tell online. It would be wonderful if these are cross compatible. Can anyone confirm?

I believe this has been covered in the past on the forum, and yes, the pedestrian E320 tank WILL FIT AND WORK, although its mounting point doesn't quite align correctly underneath. It can be forced into place, and as an alternative I believe some have "heated" the mounting foot with a torch and moved it into more of a compatible position when it is soft from the heat.

Let me see if I can find the thread on this.

 

[Phoenix127]

Thank you for your time. This sight is an enormous information resource.

 

[bclifton]

Since this thread might come up in a search for others w/ W124, I wanted to share another part substitution which worked for me. This would be my 1987 300D - although probably applicable to other models too (ex: 300TD, maybe the 300D 2.5).

My 87 300D came with expansion tank 124-500-09-49. This has been hard to find. I rolled the dice a bit after comparing pictures and tried 124-500-13-49 (by Rein automotive, if that matters) and it's physically identical to my original part. Side by side, I didn't notice any differences. Fitment was perfect.


The old unit which finally gave way and cracked after 38 years of service:


And the new unit installed - you'll also notice the replacement hose for overflow (230-476-87-26), replacing the old broken braided hose.


Need to do a proper OWNERS thread update

 

[gsxr]

@bclifton - does the Rein tank have the silica pack inside? I assume it doesn't, but would be nice if it did.

Without the silica pack, I wouldn't recommend going much beyond the 5 years Zerex says is safe for G-05.

 

[bclifton]

@bclifton - does the Rein tank have the silica pack inside? I assume it doesn't, but would be nice if it did.

Without the silica pack, I wouldn't recommend going much beyond the 5 years Zerex says is safe for G-05.

Good question - I don't believe it does. I think you had asked me before and so I had inspected it. I didn't know that was a thing - but then looked closely and didn't see anything inside the unit.

When you say 5 years- that's the max life for going w/ out changing fluid, right?

 

[gsxr]

Good question - I don't believe it does. I think you had asked me before and so I had inspected it. I didn't know that was a thing - but then looked closely and didn't see anything inside the unit.

Thanks, Brian! Photos of the silica pack are here. Your old tank, if OE, should have this (unless it was original from 1987, which may not).

When you say 5 years- that's the max life for going w/ out changing fluid, right?

Correct. The Zerex G-05 bottle says it's good for up to 5 years / 150kmi. In general, if you push or exceed the limits, I highly recommend annual pH testing (link) to make sure the coolant is not turning acidic. As discussed in the other thread, I suspect the silica pack in the MB reservoir may extend coolant life to ~15 years as in later model MB's.

 

[gerryvz]

Silica pack or not, coolant should NEVER go 15 years. I think even 5 years is pushing it. Really, it should be changed every 2-3 years.

Even the MB maintenance booklet that came with the E500E says that coolant should be changed every three years. This was when MB was using Zerex G05 (diluted ~50-50 with distilled water).


Just change it (or flush it) every three years. It's not worth cheaping out on, especially if you live in a non-Southern or non-West Coast climate. Zerex G05 is inexpensive.

 

[gsxr]

Gerry, you are 100% correct that the original maintenance interval was 3 years.

Zerex label shows 5 years (photo in previous post above).

I discussed the 15-year interval a few years ago in this post. The W211 chassis official interval is 15 years... using the same G-05 antifreeze.

@Klink? What sayeth thou?

 

[captruff]

I change the coolant every 2 years when I do the brake fluid and the SLS fluid. I prefer clean fluids.


Jeff

 

[gsxr]

I'm all for clean fluids, but a proper antifreeze change is a RPITA. 100x more so on early M119's without the hose-fitting block drains. It makes a colossal mess draining the block. If you're paying someone else to do it, great, that takes out the nuisance part. However - just like there's no point in changing fully synthetic engine oil with 1000 miles on it, I'm also not a fan of discarding perfectly good antifreeze - that's lousy ROI. As a DIY job, the coolant change probably takes 1-2 hours on a late-drain car, maybe 2-4 hours on an early-drain car. Not fun.

Which circles back to, at what point does a fluid need to be changed? Engine oil can be analysed to tell you the remaining lifespan (TBN/TAN). There are coolant testing services available as well but I've never used them (yet), only the pH test strips.

I do change brake fluid every 2-3 years though. One reason is, it's relatively easy (<1 hour on the lift) and not expensive (<$20). Second reason, you can see a visible difference in brake fluid color / appearance even at 2-3 years. I can't see any difference with 10 year old antifreeze vs 2 year old (nor 1kmi vs 5kmi on engine oil). Having a dozen cars doesn't help... if I were to change coolant every 2-3 years, I'd be doing it on one vehicle every few months. UGH.

 

[gerryvz]

Bottom line, is that I would prefer a three-year coolant change (per the factory maintenance book), but am good with going up to 5 years, but no longer.

It's similar to changing full-synthetic (Group IV/V) motor oil -- I go 5,000 miles on my RedLine oils, even though many say they are good through 10,000 miles and even beyond. To me, that's too old, and too many combustion by-products (acids and such) are suspended in the oil. And for "dino" (Group III and lower), I go 3,000 miles.

MB specified coolant adheres to spec 325.0 for the W211 chassis. Originally, this was indeed the yellow/straw colored "G05" coolant that we know so well on this forum. However, as of ~ model year 2014 (well after W211 production ceased after the 2009 model year), they superseded the yellow G05 with the blue G48 coolant. The blue stuff also adheres to the 325.0 spec -- this did not change. The blue G48 is also supposed to be "compatible" with the yellow G05 coolant.

For the W211 (at least, for my E63 AMG), MB specifies replacing coolant every 150,000 miles or 15 years. The reason they stretched this interval out, was to reduce ownership/maintenance costs. Same as with oil changes. Why would MB (for many years) specify coolant changes at 3 years, and then all of the sudden -- with the same exact coolant -- extend that interval by 5x?

To me, that is a joke. It's the equivalent of 10-12,000 mile oil changes. Stretch it out if you want, but it's prudent to go 3-5 years max for this critical fluid.

My two cents.