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  #1  
Old 02-28-2008, 04:36 PM
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Power Steering

I have a w108 1967 250S. When I got the car last year, I put in a new power steering pump along with new lines. The car is very hard to steer at low RPM. At idle, it feels like manual steering.

My question is whether this is true power steering or is it manual assist? Is this typical or do I have a problem?

I have been using (on advice from here) standard power steering fluid. Would I have better luck with ATF? Is there something else I should be looking at?

It's my wife's car so this is a big issue.

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Old 02-28-2008, 04:57 PM
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Was it a new rebuilt or just a good used pump?

I know it is a bit late now but did you match the pulleys for size?

Did you have to relocate the pump mounts or do a little creative work to get belt alignment?

I ask the mounting question because there are two different size pulleys on the crankshaft. You need to use the smaller inside pulley for the pump.

I installed a M115 engine in a W114 body using the original M130 power steering set-up. I had to be creative with the pump mounting bracket and used the inside of the two larger pulleys (Harmonic balancer, small pulley and then the two larger ones).

I have the same problem. Weak low-end steering and dang near manual at idle. Also a lot of air in the system and splooge around the wing nut of the resevoir.

No, the problem is not normal. It's a flow issue with the pump. Both my 280's spin the wheels smoothly at an idle.
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Old 02-28-2008, 05:27 PM
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I used a new rebuild. In fact, I bought the wrong one at first and had to return it. It had to do with the type of output shaft on the pump. I used the pulley that I already had on the car because it didn't come with one. I did not have any alignment issues with the belt. Once I got it in, everything lined up perfectly. I didn't take the belt off the crank shaft so I assume it's on the correct pulley. I will, of course, check it again. I was thinking that I'm using power steering fluid that is more viscous than ATF, I may not be getting the same fluid pressure. The only other thing that is an issue is that the steering box itself is weeping and should probably be replaced.
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Old 02-28-2008, 06:38 PM
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It sounds like your power steering might not be functioning at all.

Tom W
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  #5  
Old 02-28-2008, 06:41 PM
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Check the bronze filter under the plate in the reservoir. It is sandwiched between the drain baffle plate and the bottom of the res..you have to remove the plate to see it and many do not even know it is there b/c it is hidden under the baffle.

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42B7142NRM&year=1968&make=MB&model=280-S-001&category=M&part=P%2FS+Filter
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Last edited by Arthur Dalton; 02-28-2008 at 06:47 PM.
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  #6  
Old 02-28-2008, 09:39 PM
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That filter's actually a type of wood I believe, or at least it feels like it.

I can steer my 108 with my pinky. It's the easiest to steer car I have, due to the large wheel and the power steering working it feels like doubletime compared to other cars.
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Old 02-28-2008, 11:15 PM
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Sintered Porous Bronz element. Common in aircraft products.
But I know the wood looking one too...although I doubt it to actually being wood. Some kind of petro resistant composite, I would think.
Anyway, do check it before anything else..
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Last edited by Arthur Dalton; 02-28-2008 at 11:51 PM.
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  #8  
Old 03-01-2008, 02:32 PM
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My mistake. I just changed the oil on the '72 250C. The smaller pulley is on the OUTSIDE! I remember now I had to set the pump BACK because the M115 oil pan does not have the extra "hip" on it where the lower pump mount attaches.
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Old 03-03-2008, 11:08 AM
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Hey mike, just curious, how did that conversion go? Did you notice a difference in fuel economy? I know that the coupes are the lightest of the w114/115 series, I suppose due to 2 less doors and less glass.
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  #10  
Old 03-03-2008, 05:32 PM
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It's tough to gauge the MPG since it's my wife's car. She's one of those, put whatever amount of she has on her into the fuel tank, kind of people. I'm the one who usually fills it up and I'm also the only one who resets the odo. So, if I go by the odometer readings I get, ranging from 45 mpg to about 15 mpg.

It seems actually to average about 17 to 18.6 in town which is about 2-3 mpg better than when the engine was in her 220.

The conversion went surprisingly smooth. Other than a few bumps; had to change the oil sending line from the 220 because the line on the 250C was too short (the M115 filter is mounted in front of the engine mount), changing out the manual transmission stuff, the exhaust header pipe, making a connector for the header pipe to the exhaust system, disconnecting and jumpering the P-N safety switch and of course the power steering pump.

It would have been more complicated if it were a '73 or newer coupe due to the gauge changes.

Fuel injection is next on the list. No more twin Solexes! Hooray!

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