Author Topic: Fuel accumulator 0438170004  (Read 628 times)

adamb

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Fuel accumulator 0438170004
« on: 06 February 2021, 10:06 AM »
I've ordered and received a replacement fuel accumulator Bosch 0438170004. This is a two port accumulator and is the correct part for my 1977 6.9. Reading other posts I see that later models have a one port accumulator. The item is stamped Bosch, made in Germany, as per the pics. Surprisingly it is not painted dark green, instead it looks like it's made of stainless steel. Anybody else seen these? Can I be certain that it's a genuine unit and not a copy?

daantjie

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Re: Fuel accumulator 0438170004
« Reply #1 on: 06 February 2021, 10:47 AM »
Looks fine to me.
Daniel
1977 450 SEL 6.9 - Astralsilber

ptashek

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Re: Fuel accumulator 0438170004
« Reply #2 on: 06 February 2021, 04:50 PM »
Did you order from Mercedes or is it NOS of some 3rd party site? The OEM part I got a couple years back from the dealership wasn't  made by Bosch, but some company in Czechia. Colour is right though.
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

Jed

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Re: Fuel accumulator 0438170004
« Reply #3 on: 06 February 2021, 05:11 PM »
My bosch unit from a few years ago was also dark green.  I have never seen that finish myself...
1979 Mercedes 6.9 #5206 - restored
1979 Mercedes 6.9 #6424 - ongoing restoration
1976 Mercedes 6.9 #484 - restoration?

nathan

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Re: Fuel accumulator 0438170004
« Reply #4 on: 07 February 2021, 02:43 AM »
I would think its legit.
whilst in the garage, I pictured this one TJ gave me for my m110 280te resto.
as described, the green type
6.9 79 #6436
6.9 79 #6290
6.9 79 #6181
6.9 78 #4764
6.9 77 #3096
6.9 76 #1741
6.9 76 #0902
6.9 75 #0018

tcj

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Re: Fuel accumulator 0438170004
« Reply #5 on: 07 February 2021, 03:46 AM »
Bosch moved the production to another plant 2 years ago, and by this they changed to an eco-friendly coating, so accumulators of current production are silver in appearance now.
112.021
116.028
116.036

Eyeman

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Re: Fuel accumulator 0438170004
« Reply #6 on: 29 September 2021, 09:55 PM »
I finally got my 6.9 back after over a year long suspension rebuild.  Unfortunately my mechanic did not seem to think fuel accumulators were available.  Even after just shutting my car off for a minute or two I have to crank for 20secs to get fuel back into the system.  Just checking to make sure this thread is correct and that's the part I'll need?  Thanks for your help.

rumb

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Re: Fuel accumulator 0438170004
« Reply #7 on: 30 September 2021, 07:02 AM »
Beside the accumulator, if your injectors are old and leaky it will present the same problem.  If you have issues 1 minute later I would look there.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

Eyeman

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Re: Fuel accumulator 0438170004
« Reply #8 on: 30 September 2021, 07:48 AM »
Thanks.  I stopped and got gas yesterday.  Took 10secondsish to get fuel back into the system after just a few minutes at the pump.  Mechanic was sure it was the accumulator, is that part number correct?

UTn_boy

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Re: Fuel accumulator 0438170004
« Reply #9 on: 30 September 2021, 10:50 AM »
There were two different accumulators used on the 6.9.  You need to make sure that it is, in fact, a two port version before you buy one.

Up to chassis number 005692 part number 000-476-01-21 is used.  This is the two port version. 

From chassis number 005693 part number 000-476-04-21 is used.  This is the one port version. 

Both show to still be available new from Mercedes.  The single port currently retails for $595 USD and wholesales for $428 USD. 

The two port version currently retails for $386 USD and wholesales for $285.

Both are also readily available on ebay and other parts sources. 

Both accumulators were used on all CIS fuel injected modes, and not just on the W116.  They were also used on R107 and W123 cars. So if you see a listing that mentions only R107 or W123 then it'll be the same part.  Some people aren't all that knowledgeable when they list parts. 

Here is one in Latvia with free shipping for 250 Euros.  And yes, that is a good price.  Don't question it.  https://www.ebay.de/itm/384370812471?epid=1014631496&hash=item597e492637:g:izAAAOSwbP9hMkPC

1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1971 280sel Black/black leather
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rumb

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Re: Fuel accumulator 0438170004
« Reply #10 on: 30 September 2021, 11:42 AM »
IF the injectors leak then all the system pressure goes away.  You then have to crank to build the pressure up again. 
Bad accumulator exact same symptoms.

If you haven't ever checked your injectors I would bet that all are leaking. You can get uncle kent's injector cleaning kit, or even better  find a local diesel shop and they can rebuild them. I have kent's tool.  It's amazing how poor nearly all old ones are spraying at first.

0000785623  plus you will want new seals 1160780873 about 2 buck each.

You can get new from MB for about $40 each. Rebuild will cost half that.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

TNNBENZ

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Re: Fuel accumulator 0438170004
« Reply #11 on: 30 September 2021, 11:29 PM »
I have read several times not to try to remove the plastic holders the injectors are in because that almost always break into many pieces and fall into engine. Is this correct and will  uncle kent's injector tool keep the from breaking ???
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rumb

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Re: Fuel accumulator 0438170004
« Reply #12 on: 01 October 2021, 06:41 AM »
That is precisely why you want to replace them.  They get old and hard.  I dont think they fall apart when you remove them, maybe someone here has had that experience?

The Tool I refer to is used to clean the injectors once you remove them from the car.

https://mercedessource.com/store/cis-gas-fuel-injector-spray-pattern-tester-and-nozzle-cleaner

'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

Eyeman

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Re: Fuel accumulator 0438170004
« Reply #13 on: 01 October 2021, 08:02 AM »
Cool, thanks for the help.  Weird enough after my car sat all night it started right up.  Drove it to the gym and it had the same fuel leakdown issue.  I'm mainly worried I'll kill my battery having to turn the motor over so long.  My car has always been a tad difficult to get started.  It might just be tuned better now or maybe before it would flood, but it actually starts great now, it just usually has that long fuel leakdown lag. 

rumb

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Re: Fuel accumulator 0438170004
« Reply #14 on: 01 October 2021, 08:55 AM »
"or maybe before it would flood"
If the injectors leak, then it does create a "flood" situation.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550