560 SL - Rocker Arm - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 05-20-2019, 08:00 AM Thread Starter
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560 SL - Rocker Arm

Hello,

I am hearing a slight ticking sound coming from one of the rocker arms, can the hydro rocker adjuster (see attached picture) be adjusted to reduce any slack?



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post #2 of 14 (permalink) Old 05-20-2019, 08:41 AM
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The valve clearance is adjusted by changing the thrust washer thickness. They come in various thicknesses. There is a tool you use to check the adjustment and then you select the thrust washer thickness to bring the clearance (actually pre-load) into spec.

The picture shows the thrust washer, the rocker is also likely the same on your engine but the other components shown in the photo probably don't apply to your car.

560 SL - Rocker Arm-mercvalve-components.jpg

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post #3 of 14 (permalink) Old 05-20-2019, 08:43 AM Thread Starter
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Thank you - so the "adjuster" isn't used for adjustment?

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post #4 of 14 (permalink) Old 05-20-2019, 09:19 AM
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Originally Posted by S320L1999 View Post
Thank you - so the "adjuster" isn't used for adjustment?

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It is on those. They are for solid lifters.
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post #5 of 14 (permalink) Old 05-20-2019, 10:42 AM Thread Starter
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It is on those. They are for solid lifters.
The 560 SL has solid lifters?

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post #6 of 14 (permalink) Old 05-20-2019, 10:55 AM
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No. I have no idea why the picture showed 560 in the title. Only the early 3.5, 4.5 and all M110 2.8 107s had solids.
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post #7 of 14 (permalink) Old 05-20-2019, 10:56 AM
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Thank you - so the "adjuster" isn't used for adjustment?

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The "thrust washer" in Jyuma's pic is available in various thickness to shim the hydraulic compensator you posted.
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post #8 of 14 (permalink) Old 05-20-2019, 10:57 AM Thread Starter
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My car is a 560 SL - this part showed on the diagram, obviously wrong then.

How is a ticking sound then remedied, new lifter or new arm?

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post #9 of 14 (permalink) Old 05-20-2019, 12:57 PM
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I think we better clear a few things up before we go too far into left field.

1. The picture you originally posted is a hydraulic compensator... it is not adjustable.
2. The picture I posted was to show you what a thrust washer looks like. The other components in the picture I posted can be ignored, as they are not for your engine (the rocker may be).

If I'm understanding correctly your engine uses hydraulic compensators (like the one you posted in your picture), which screws directly into the head (no adjustment). The hydraulic compensator provide a pivot point for the rocker that sits between the cam and the top of the valve. Perched on the top of each valve is a thrust washer (shown in the picture I posted). The thrust washers come in a variety of thicknesses... and they ain't cheap.

https://www.autohausaz.com/catalog/k...adjuter%20shim

You need a special tool to measure the preload. The tool will tell you if you need to use a thicker shim or a thinner shim or it's right the way it is. Search the forum, there are a number of threads on the use of the special tool.

Here's a picture of the tool.

560 SL - Rocker Arm-mercvalveclear3.jpg

Here's a diagram showing the tool mounted in position for measuring.

560 SL - Rocker Arm-mercvalveassembly.jpg



FYI... I have a valve tick in my 380 and I replaced all the hydraulic compensators and adjusted all the Thrust Washers to dead nuts... and I still have the tick. Grrr.

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post #10 of 14 (permalink) Old 05-21-2019, 01:05 AM Thread Starter
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Great, thank you.

So, the attached picture is in fact a hydraulic lifter.

So the possible solutions/reasons for the slack and resulting noise are:

1. Cam lobe
2. Rocker arm
3. Defective lifter

So the pucks/shims could compensate for worn rocker or lobe?



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