Shock replacement, forgot to mark mount orientation/arrow direction - Lexus IS Forum
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post #1 of 15 (permalink) Old 06-18-2019, 06:06 AM Thread Starter
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Shock replacement, forgot to mark mount orientation/arrow direction

Need some help here. I've replaced shocks before on other cars, but never had the mounts have a certain orientation. I went through and replaced both front shocks on my 03 with KYB GR-2's without reading the guide so I didn't know to mark the springs and mounts. Well, my passenger side is creaking and clanking over low speeds now, so from what I read I have the mount on wrong. I see the middle bushing is angled slightly to allow for the shock lean. Just looking for the orientation on where the L R markings and arrows are supposed to point for the mount. I did make sure that the arrows on the upper insulator/boot lined up with the mount arrows and that the springs were snug in both ends. My drivers side makes no noise.

There is only 3 ways it can go so on Thursday when I'm off I'm just going to pull the strut, loosen the top and twist it around... just wanted to see if someone did this recently and could say definitively.
I did find this thread https://www.my.is/forums/f87/shock-replacement-550369/ which has a picture for the orientation. Looks like the arrows point in toward the motor if I'm reading the image correctly, so they should pretty much point directly at the opposite strut?
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post #2 of 15 (permalink) Old 06-18-2019, 11:39 AM
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This has always been a mystery to me too. I point the arrows forward and outward.
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post #3 of 15 (permalink) Old 06-18-2019, 07:00 PM
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Originally Posted by Ek9B18 View Post
This has always been a mystery to me too. I point the arrows forward and outward.
Same, but i have always thought the arrows were a bit bizarre. Does the piston have to be orientated a certain way in the strut or something?

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post #4 of 15 (permalink) Old 06-18-2019, 08:00 PM
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As the OP pointed out, the top hat seems to have been made with a slant in the top bushing so it's not straight up and down. Forward and out seems to put the least amount of pressure on the shock shaft for me.

I was just thinking about modifying the top hat with a spherical bearing so I don't have to ever worry about top hat position and there's no pressure on the shaft.
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post #5 of 15 (permalink) Old 06-19-2019, 06:23 AM Thread Starter
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Thanks Ek9B18 I'm going to try that orientation out first. I didn't see any arrows on the plates that go between the body and the top of the strut, those don't need a certain position too do they?
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post #6 of 15 (permalink) Old 06-19-2019, 08:58 AM
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The re-enforcement plates don't have an orientation.
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post #7 of 15 (permalink) Old 06-19-2019, 05:31 PM
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IIRC arrows face forward.
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post #8 of 15 (permalink) Old 06-20-2019, 06:46 AM
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That's the thing though. There is no position where the arrows point straight forward. It either points in and forward or out and forward. Looking at your pic, I don't see the arrows at all.
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post #9 of 15 (permalink) Old 06-20-2019, 02:51 PM
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Originally Posted by Ek9B18 View Post
That's the thing though. There is no position where the arrows point straight forward. It either points in and forward or out and forward. Looking at your pic, I don't see the arrows at all.
Yeah i always work off the fitment of the spring ends, as long as they fit the shock in the right place and the top hat rubber in the right place the arrows should be pointing forward to the right place. In the end, as far as i understand it the important part that the springs are help captive correctly.

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post #10 of 15 (permalink) Old 06-20-2019, 08:10 PM
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In the diagram, the speed sensor clip is place toward the front.

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post #11 of 15 (permalink) Old 06-20-2019, 08:24 PM
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In the diagram, the speed sensor clip is place toward the front.
We're talking about the orientation of the top hat, the speed sensor is welded to the shock itself.

When you take all that apart to replace the shocks, you lose the orientation between the speed sensor and the top hat. In fact what you posted shows the orientation of the shock to the car but doesn't indicate what direction the arrow stamped into the top hat should go.
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post #12 of 15 (permalink) Old 06-22-2019, 05:43 AM
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So when I did my shocks I marked the tophat to the body so they went back in correctly. The arrow point forward and inboard. So on the left side it pointed to 1 o’clock and on the right side the arrow pointed to 11 o’clock. You can see the arrows in the attached picture as its marked L & R

But you have 1:3 chance to get it right. It will either point forward or to the passenger or drivers door. In the end its not rocket science.

Let me add, when I did mine, I didnt notice a difference in the top hat for lean and the FSM makes no reference top hat orientation. My guess is it make no difference. But I would have the arrows point forward. The lean of the shock is built into the body of the car fender as it should be.
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"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
-- Pres. George Washington
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post #13 of 15 (permalink) Old 06-22-2019, 02:40 PM
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The arrow point forward and inboard.
Well, that answers this topic then. I might take mine back apart and try it that way.
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post #14 of 15 (permalink) Old 06-23-2019, 12:48 PM Thread Starter
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So to follow up with what I started, I took my passenger side apart. Looks like my problem was bad quality control on KYB's part and a defective mount. The top mount bushing was practically just a circle and so the whole shock was bouncing around inside the mount. My OEM insulator arrows were lined up with the KYB mount arrows. Also, from looking at the stock insulator, it doesn't seem like there is a way the arrows can go any other way because the spring sits inside the insulator exactly where it is all notched... so the arrows will only be in one position. My orientation is just like EK9B18 originally stated, forward and out. I still had my old 180k mile mounts, the bushing was in great condition just some surface rust on the metal, so I just wire wheeled it all and painted it. After assembly the problem is gone, no noise at all. I've put about 300 miles on so far.

Pictures show KYB on left and OEM on right, you can see the hole for the shock lean is gone but well-defined in the OEM. The plate between the mount and shock also has two notches but no other markings. Notches are in between two holes and then directly lined up with another hole. I orientated this plate so middle notch lined up with the arrows and other notch is directly across from it. Last picture shows where my arrows and orientation are (scratched the paint to make a circle) vs where the ABS mount is. This angle seems close to the picture in this thread.

Like I said I haven't had any issues so far with having my arrows forward and out. I'll update this thread if that changes I rack up miles pretty quickly.
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post #15 of 15 (permalink) Old 06-23-2019, 12:56 PM
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Do you have the steel bushing on the piston shaft below the mount? The nut on top and bushing below is what secures the shock to the mount.

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