78 450sl power steering pump - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-10-2011, 05:29 PM Thread Starter
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Date registered: Sep 2011
Vehicle: 1978 450 sl
Location: Kittery, Maine
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78 450sl power steering pump

MY pump has spit up, and is growling. still has fluid in the reservoir, but sounds dry, and steering is manual feeling. filter in the pump clogged? rebuild time? 136,000 miles, unknown maintenance on the pump.
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post #2 of 3 (permalink) Old 11-10-2011, 06:39 PM
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Easy enough to check the filter. Drain the reservoir and remove the filter. Doubt that is the problem but you never know.
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post #3 of 3 (permalink) Old 11-10-2011, 06:50 PM
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Best case scenario is that the filter is plugged, and the pump just thinks it's dry because nothing is getting to it from the reservoir.

Worst case is that the pump has gone, and you need to replace it.

The job of replacing the filter is not difficult, just a bit messy. and you sacrifice SWMBO's turkey baster. Tell her she needed a new one anyhow, now that Thanksgiving is only a couple weeks away.

You draw as much of the fluid out of the reservoir as you can, then the top of the filter should be visible. On some older pumps, there was a plate with holes in it. You just have to pick the old filter out, drop in a new one, and refill.

There have been some procedures that say you should put the front end up on jack stands, so the wheels are free to turn (side to side with the steering wheel), and that you should turn the wheel lock-to-lock with out turning on the engine to make sure you get all air out of the system before starting up. This is more for a pump (or hose) change-out, but if you want to...

Just make sure to check the fluid level after you run the engine a few seconds, to make sure that you get any air out of the system.

Hope this helps,

Remember: It's not just a car. It's an Adventure.
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