Power steering reservoir

[gordon]

I have mislaid the stud/ bolt which supports the power steering reservoir. It fits into the distributor chain case and the banjo fitting oil line from the injection pump screws into it.

Can anyone describe what it looks like  and how far does it screw in as I understand that it acts as a chain guide? Part number?

Thankyou (230 sl)

[Benz Dr.]

There are two different ones with the one for power steering being the longer of the two. The banjo bolt goes into a separate hole and is not part of the chain case bolt that supports the oil container.

This part is about 40 - 50mm long with a rounded stud on the end that closes up against the timing chain. It's not supposed to touch the chain and should only come close enough to keep the chain running tightly against the distributor drive gear so that the chain can't jump a tooth if it gets loose. I suspect that the end running near the chain is probably hardened to prevent wear.

[Pawel66]

Dan,

Just been through this, but I am left with a bit of dilemma here. Maybe you can help on what is the correct number for this screw:

1. I suppose it is the big screw from the picture attached we are talking about.

2. When you just go to TIMING in the EPC, you will get what is on the screen shot from EPC attached - regardless of M127 or M130 and there is no distinction if you have a power steering or not. The number is A615 0520171. But this screw is supposed to go in the housing up to certain distance. This distance is different when you have the reservoir bracket or when you do not have it. I guess this is what you meant.

3. When you go to M127 in EPC, you will see the Power Steering section in Engine group (another screenshot attached). Here it shows this screw going through bracket and it has different number, A1100520171, which is NLA.

So I guess the A6150520171 may be a wrong one for when you have the power steering?

Anyone can help?

[Benz Dr.]

My original 230SL parts book shows PN 189 052 00 71.  Yes, it's the larger screw in the pic. 615 is actually a diesel PN so I imagine that this part is used in a lot of different engines.

I have used two aluminium seals on each side of the power steering bracket but I think thread sealer would do the same job. Measure the distance from the surface of the milled area on the outside of the block to where the timing chain is sitting on the distributor drive gear. Let's say the distance is 20mm. Measure the length of the threaded screw minus the head and compare. Accounting for the thickness of the bracket on the canister, you should look for a couple of mm clearance between the head of the screw and the timing chain. This screw holds the chain from ever jumping any teeth on the drive gear but it shouldn't actually touch the chain. If you have the original screw from your engine it will be the right length and you need not worry about it.

[Pawel66]

Dan, thank you. I will do the check and ensure 2-3mm clearance.

When I got to this screw in my engine, I saw I had one that someone just shortened, so I am not sure it is the right length. Yes, I fitted the 615 (the only one I found at that time) with thread seal and two seal rings.

The part number yuo provided, A 1890520071, I assume this is for the power steering version with reservoir, is now repalced by the one I found, A 6150520171. This would suggest that this number is good for both with and without power steering vrsions as there is no other number for this screw now on the parts list. But I am not sure if this could be the case.

For M127, where I have the drawing of the power steering bracket (attached below) we have A1100520171 on the picture with the bracket. IT IS AVAILABLE, actually, I checked.

I do not have the parts lists for the power steering neither for M130, nor for M129, so the only number for this screw is the 615 one that I found.

[gordon]

Thankyou guys for your help, now I know what I am looking for.

[Pawel66]

This is great Gordon, but I do not.... 

If anyone can help answer: which screw should I use for M130 with fluid reservoir bracket?

I simply do not have power steering parts drawing depicting the reservoir, bracket and the screw. I found it for M127, ut the screw mentioned there was used in M127 only. What is it for M130?

[gordon]

I have found my missing bolt ( I will attach a picture if I can)  With a thin washer under the head and passing through the reservoir bracket   there is about 3mm of clearance from the chain when tightened up. I used thread seal

[gordon]

Photo

[Pawel66]

This is a great help Gordon, thank you!

[Pawel66]

Ok, just to close the topic for future generations.

I found the power steering drawing for M130. It is, obviously, under Air Compressor, where else?

The part number for the reservoir holding screw is the same as for M127, A 110 052 01 71.