Author Topic: '70 280SL p/s hose (Read 7755 times)

Ferrolanoman · « **on:** June 26, 2018, 21:42:23 »

Gents,
The power steering hose, from the p/s reservoir to the p/s pump, shaped like a 90 degree angle, held by clamps, made of fabric wrapped rubber, non-pressure I assume, needs to be replaced. Mine looks to be the original one and is showing multiple small age cracks, it's also hard (no longer at all flexible), not leaking yet but soon it will and it'll make a mess aside from causing loss of the power steering assist. This is for a 1970 280 SL, equipped with a manual 4-speed. Neither Buds Benz nor Pelican list it. Can someone here please give me a part number so I can order it as soon as possible? I would guess that the hose is approximately 1/2" inside diameter.
Thank you all in advance.
Ricardo

clunker · « **Reply #1 on:** June 27, 2018, 00:24:20 »

I bought the low pressure side power steering hose from autohausAZ - part number 0069970982 - cut to length, replace both sections of the low pressure side hoses.
To prevent the pump to reservoir short section from kinking, use a Unicoil (eg Gates 28511 5/8" - confusingly they are sold are by ID of hose to be wrapped.)

Pawel66 · « **Reply #2 on:** June 27, 2018, 07:39:05 »

Reservoir to pump is A0039977782 and it is ordered by meter at MB (picture, item 83). It does not look like shaped at 90 degree angle... I think this will be replaced, when you order, with a newer version.

In case you meant reservoir - box, it is A0069970982, also sold be meter at MB. This one is available. $60 or so per meter here.

Ferrolanoman · « **Reply #3 on:** June 27, 2018, 12:07:15 »

Fig 83 (straight piece) is NOT what I need. Mine is the other (not pictured) low pressure hose, nearest the battery, which is angled (90 degrees), also connecting the reservoir to the pump, and which I cannot find pictured anywhere. I don't imagine that a water/heater/radiator by-pass substitute would work given the properties of power steering fluid vs. water glycol--would it?

awolff280sl · « **Reply #4 on:** June 27, 2018, 12:21:07 »

I believe you need 006 997 09 82 hose, ordered by the meter.
And use the Unicoil.

Pawel66 · « **Reply #5 on:** June 27, 2018, 13:59:38 »

We gave you hose no. 60 and the other no. 60 from the PS 2 picture below. The one that is left is no.61, which in MB world is PN A1099970882, picture PS 3. But it does not go to reservoir. You also have A0069970982 on picture PS 3, no. 127.

Wrapping up:
pump - reservoir A0039977782, pic. PS, no. 83 or pic PS 2, no. 60
reservoir - box A0069970982, pic. PS 3, no 127 or pic 2, no. 60
pump - box A1099970882, pic. PS 3, no 127 or PS 2 no. 61

I do not see more hoses... sorry.

I am providing link to SLS - they usually have the best pictures.

Are you sure that a straight fitting is used in the pump in your car, therefore the hose needs to be bent? On the pictures you have fitting angled and straight hose (which is better, probably).

Ferrolanoman · « **Reply #6 on:** June 27, 2018, 17:27:52 »

Yes, got it now! It's #60 hose connecting #40 to #65 on the second diagram. Thank you for your invaluable help.
Ricardo

Pawel66 · « **Reply #7 on:** June 27, 2018, 21:19:15 »

A0069970982

Good you found it.

Ferrolanoman · « **Reply #8 on:** July 04, 2018, 22:44:57 »

Well, I found locally 5/8" i.d. multipurpose hose (everything except fuel) at a truck supply store and a 5/8" unicoil (to keep it from kinking) and successfully installed it. However, after refilling the reservoir with proper p/s fluid (NAPA), I suspect that previously someone had been using A/T fluid judging by the smell and the red color. Hopefully, since I had drained the reservoir completely, no harm done in mixing the two fluids, or by having the A/T in there before--about 10 yrs. You think?

Shvegel · « **Reply #9 on:** July 05, 2018, 00:50:37 »

If memory serves the proper fluid is automatic transmission fluid.

Ferrolanoman · « **Reply #10 on:** July 05, 2018, 03:47:36 »

Ooops, can some else confirm or counter the p/s vs the a/t fluid. Which is correct? I haven't started or driven the car yet and will wait to do so until I get a consensus from this group.

ja17 · « **Reply #11 on:** July 05, 2018, 03:56:17 »

Yes, I believe the original paint label on the PS reservoir top specified automatic transmission fluid.

Ferrolanoman · « **Reply #12 on:** July 05, 2018, 04:14:03 »

Thank you both. In the morning I'll suck out the p/s fluid and refill with ATF. I should have trusted my nose and eyes (red vs clear fluid) and used the more common ATF. Also just now looked at the owner's manual and it says to use ATF in the power steering reservoir (as well as on BOTH the manual and the automatic transmissions).
again, thanks
Ricardo

Tyler S · « **Reply #13 on:** July 05, 2018, 14:15:36 »

Modern ATF is not supposed to be used in the power steering. The fluid that should be used was manufactured by Pentosin and is mineral based. If the fluid is red then a PO or jiffy lube type place most likely added ATF along the way as most domestics of the era used ATF in the power steering which was Dextron II. (NLA) The additives in modern ATF cause wear in older reciprocating ball type steering systems such as ours. When in doubt use the MB approved fluid.

MB part# Q-1-46-0001-M22
Febi alternative # 81229407549A

Pawel66 · « **Reply #14 on:** July 05, 2018, 16:45:22 »

Tyler, this is a new piece of information to me - on the liquid to be used for p/s.

I tried to order the number you quoted via Webparts, but it does not work - this number will change into another number. Are you saying to trust MB and use the replacement they will come back with?

When I went in with the Febi code you provided to the internet store, I found out:
febi number: FE06162

81229407549 - this is the BMW OEM for it

It is an LHM green oil Nivomat.

Is it the one w are looking for?

mrfatboy · « **Reply #15 on:** July 05, 2018, 17:29:15 »

This is the Febi P/S fluid that Tyler is talking about. I switched to it last year.

https://www.pelicanparts.com/More_Info/Q-1-46-0001-M36&SuperCat=Y&SVSVSI=5721.htm

Ferrolanoman · « **Reply #16 on:** July 05, 2018, 17:39:50 »

So, you can't use modern ATF for the auto or the manual transmissions either because of the additives? Are we on the verge of overanalyzing/protecting these vintage cars? Should they be relegated to a museum?

Pawel66 · « **Reply #17 on:** July 05, 2018, 17:45:29 »

ok, this is what I found:
https://e-katalog.intercars.com.pl/?search=fe06162&utm_source=intercars.com.pl&utm_medium=searchBoxWidget&utm_term=fe06162&utm_campaign=searchBoxWidget#/produkty/1613152115221-FE06162-olej-lhm,scr_dItems.html

Tyler S · « **Reply #18 on:** July 06, 2018, 15:03:23 »

The ATF formulation was changed with dextron II and III. For this reason, MB stopped using ATF in its steering systems in the mid 80's. These cars used an almost identical ball recirc type system. ATF was known to cause premature wear. Seal hardening was also an issue. The switch included all models past and present. Look for a fluid that has the 236.3 designation. Or you can use the synthetic fluid that Pawel and Mrfatboy posted. The mineral based fluids are not compatible with modern ATF so a flush will need to be performed when switching. If modern ATF has been run int the system for a extended length of time, then the damage may already be done. My car was owned by my father and he used to change/add with ATF because all of his other cars (Fords) used the same thing. This car has had its pump replaced twice and the steering box overhauled once and resealed twice. I did the work the last time when I aquired the car. The seals and hoses in both were rock hard and leaked like a sieve. This car has 65k miles on it. I am in no way an "expert" on fluids. However I hold an ASE master certification, have extensive repair experience, and rely on experts, including manufacturers, in this case MB to take the best course of action relating to repair of said vehicles

Straight from the horses mouth. https://bevo.mercedes-benz.com/bevolisten/236.3_en.html#close

Pawel66 · « **Reply #19 on:** July 06, 2018, 15:54:02 »

Clear, thank you!

Ferrolanoman · « **Reply #20 on:** July 07, 2018, 13:32:53 »

I'm grateful for the information and will put it to good use. Already ordered the fluid indicated from PELICAN along with a filter. Good thing I have not started the car since this all began, so now I'll suck out and dry the reservoir before filling it, for the last time I hope. If there's a drain on the steering box I'll find it and get all of the liquid out though I doubt any mixing has taken place without running the engine and the p/s pump. Again, many thanks for your informed cautionary advice. My car has just turned 70K miles and has only been owned by a good friend and me. He ordered it from the M-B dealer in Sacramento (4-speed) and it's lived only in AZ and CO. I have all of the paper work beginning with the purchase order yellow paper. I want to keep it in good stead as you might imagine.

Pawel66 · « **Reply #21 on:** July 09, 2018, 10:36:58 »

I have just received info from the dealer, recommended PN for PS oil is A 000 989 45 04 11 FWLE and it is ca $18 without VAT per liter in my geography.

PeterW113 · « **Reply #22 on:** July 09, 2018, 12:42:16 »

Arriving a little late to this thread.

I have just replaced the same lower pipe and it took me three goes. I thought I got it right first time, but when I looked at it again some days later, I noticed splits appearing in the new rubber pipe. It took two further attempts to fit without damaging the new rubber pipe. On all occasions I had the resovoir loose to assist fitting as the pipe ends up with quite a tight turn. The pipe was sourced from SLS Germany and I can only assume it’s not quite to the same standard as the original.

I just mention this as a word of caution as it may be worth double checking that the new rubber pipe did not get damaged when installing as happened to me.

Peter

MikeSimon · « **Reply #23 on:** August 08, 2018, 18:38:32 »

I used to work for Vickers, the manufacturer of the p/s pump. The specified fluid "back then" was ATF Dexron II, originally a GM spec.
There was also a Pentosin fluid specified, but only for "arctic climates" as it has better cold-start properties. The Pentosin stuff is rather toxic. Do not handle without proper protection.

dakman29 · « **Reply #24 on:** August 25, 2018, 04:47:18 »

I must confess to being confused after reading these threads. I have a 68 280sl. I want to change the fluid in the reservoir. The manual definitely says to use ATF. But I read Tyler's post and it seems as though MB now recommends power steering fluid. (Febi from Pelican). There is ATF in the reservoir now. Does it make sense to try to flush the system as dry as possible and then refill with PS fluid, or should I stick with ATF. And, if I use ATF I gather that I should avoid the mineral based ones. Right? Thanks

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Author Topic: '70 280SL p/s hose (Read 7755 times)