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Strut Top Mounts: Big job or not?

 
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stevencrichton  



Joined: 25 Jul 2006
Posts: 40
Location: Scotland

PostPosted: Thu Jun 28, 2007 7:27 pm    Post subject: Strut Top Mounts: Big job or not? Reply with quote

Hi Guys,

Just wondering if to replace the strut top with the encapsulated bearing I require to remove the strut and compress the springs?

If not I will be a very happy bunny

Steven
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PORSCHEV  



Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada

PostPosted: Thu Jun 28, 2007 7:39 pm    Post subject: Reply with quote

You don't need a spring compressor...but you do have to remove the struts from the car to do the job.
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924RACR  



Joined: 29 Jul 2001
Posts: 9118
Location: Royal Oak, MI, USA

PostPosted: Thu Jun 28, 2007 9:43 pm    Post subject: Reply with quote

I wouldn't quite agree with that - you can remove the top nut and jack the car off the springs/struts - but it requires access, usually, to an air gun (impact wrench)...
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Vaughan Scott
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Tiny  



Joined: 10 Apr 2006
Posts: 502
Location: London, UK

PostPosted: Thu Jun 28, 2007 11:47 pm    Post subject: Reply with quote

not a big job, but just one to be careful with as you dont want a spring to go boing out of the wheel arch into your knackers....
i used compressors personally, but can understand the logic of using the jack to take the strain.

also, make sure you have a socket or spanner/wrench which fits the top nut, as it can be a bit tight for space there.
tiny
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stevencrichton  



Joined: 25 Jul 2006
Posts: 40
Location: Scotland

PostPosted: Fri Jun 29, 2007 12:26 am    Post subject: Ok .... So... I do this then .. Reply with quote

Remove wheel.

Jack car as high as I possibly can.

Remove top bolt

Swap bearing set

Re-Tighten

Lower suspension


Does this sound right.
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924RACR  



Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA

PostPosted: Fri Jun 29, 2007 1:04 am    Post subject: Reply with quote

Nope.

Put front of car on jackstands.

Remove tire/rim.

Unbolt front swaybar endlink from front a-arm.

Place jack under a-arm and take up all slack

Remove top nut from strut rod.

Lower jack with a-arm. Strut and spring fall off to the side.

Remove and replace strut mount.

Prop spring and strut back into line, and jack up the a-arm, with a helper lining up the spring into the spring seat, then lining up the strut rod into the upper mount. Also don't forget to line up the swaybar endlink into its hole on the a-arm. Continue jacking until the nut can be installed, and tighten.

Reverse the remaining steps, and switch sides.

Can take as little as 30 min per side, if you know what you're doing.
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!tom  



Joined: 28 Aug 2006
Posts: 1941
Location: Victoria, BC Canada

PostPosted: Fri Jun 29, 2007 5:41 am    Post subject: Reply with quote

Not to hijack this thread or anything, but I need to do this too, as well as replace the struts.

My understanding is that the struts are rebuildable, in that you can just get an insert, instead of the entire strut assembly.

What is the list of parts I would need to do this? One strut has leaked it's juice out, and now groans when it moves until it is warmed up. The other side looks like there's a gap between the plate that bolts to the top of the strut and the top of the mount, when you look at it from under the hood. This tells me the upper strut mount, which has a bearing in it to help make steering easier is toast, as well as the leaking strut.

Is there anything else? I seem to recall discussions about superceeded parts, and confusion over what exactly is needed in previous discussions. Every FLAPS I've gone to wants to run and hide when the word "Porsche" is mentioned when they ask what kind of car, so I need a specific list of parts before I can get anything.

Thanks!
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Fri Jun 29, 2007 5:58 am    Post subject: Reply with quote

924RACR wrote:
Can take as little as 30 min per side, if you know what you're doing.


That is what my strut job took me.

Oh, and someone will inevitably show up squawking about how dangerous it is to do without a strut compressor, you could put your eye out or die, blah blah blah. It's completely easy, and safer than some compressors I have worked with.
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Smoothie  



Joined: 01 Jan 2003
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Location: DE (the one near MD, PA, NJ)

PostPosted: Fri Jun 29, 2007 7:30 am    Post subject: Reply with quote

I listed the parts I replaced when I re-did my strut bearings in here-
http://www.924board.org/viewtopic.php?t=9397
The main original bearing part ("strut mount support") was superceeded to an improved "944." part number.
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924RACR  



Joined: 29 Jul 2001
Posts: 9118
Location: Royal Oak, MI, USA

PostPosted: Fri Jun 29, 2007 9:55 pm    Post subject: Reply with quote

Rasta Monsta wrote:

That is what my strut job took me.

Oh, and someone will inevitably show up squawking about how dangerous it is to do without a strut compressor, you could put your eye out or die, blah blah blah. It's completely easy, and safer than some compressors I have worked with.

Yeah, what, is gohim on vacation or something?

Yes, this is the same procedure used to replace the strut insert; once you've got the strut and spring lowered out of the wheel well, you lift the spring off of the strut and can replace the insert.

This usually requires getting a VERY LARGE pipe wrench and loosening up the top nut that retains the strut insert in the strut body. Of course, you're actually supposed to use a special pin wrench, but who has that?? Thankfully, I've never had a strut nut that can't be removed by the large pipe wrench (aka monkeywrench).

Note that the strut should have some oil or antifreeze in it, loose around the strut insert; this is required to cool the strut (as it generates heat while working). Otherwise the strut can overheat and die early.

The advantage of this method is that it will not affect your alignment; if you remove the strut from the car, you have to disassemble the strut tube from the steering knuckle, thereby losing your camber adjustment. Not to mention, again, that it's the quickest way. I often use this to check my strut mounts on the racecar - though of course things there are different, as I use #660 race springs that have no preload when the car's jacked up (no longer compressed - they're only 10" long) and my strut mounts are the Paragon camber plates that require occasional inspection, etc - sometimes debris gets up in the bearings and must be cleared out.

Beyond replacing the strut insert itself, it's wise to plan to install new bump rubbers. Note that Konis use different ones than stock, I'd get new stock bump rubbers for a Boge, KYB, or other such replacement, and finally, Bilsteins have no external bump rubber; they're contained in the strut design internally. Bilsteins also come with new strut tube nuts, required as the much larger strut rod will not fit through the stock size strut tube nut.

HTH...
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Chrenan  



Joined: 15 Jan 2003
Posts: 3903
Location: Canada

PostPosted: Fri Jun 29, 2007 11:57 pm    Post subject: Reply with quote

924RACR wrote:
Beyond replacing the strut insert itself, it's wise to plan to install new bump rubbers.


Just a note here, the Bilsteins I installed came with instructions not to install the stock bump rubbers with the front strut insert, apparently Bilstein somehow incorporates an internal bump stop. So I have 2 new bump rubbers sitting in my garage if anyone wants them.
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isuras2  



Joined: 17 Jun 2005
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PostPosted: Tue Jul 03, 2007 1:25 pm    Post subject: Reply with quote

Are there any fitting issues with the strut inserts? I ask because I have monroe strut inserts and am not sure if they fit, but they were purchased for the car. A co-worker once had to use shims to get the strut inserts to fit correctly, but that wasn't on a Porsche, but a vw.
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PORSCHEV  



Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada

PostPosted: Tue Jul 03, 2007 9:14 pm    Post subject: Reply with quote

Just to let you know Vaughn...your method works perfectly!

I stole springs from my V8 porsche to put in my race 924 and swapped 4 springs in less then an hour. It helps having good air tools though.
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stevencrichton  



Joined: 25 Jul 2006
Posts: 40
Location: Scotland

PostPosted: Wed Jul 11, 2007 9:36 pm    Post subject: Job Done Reply with quote

Just to update this thread. I got the job done very quickly in the end. So I'll run you guys through it.

Tools Needed: Jack. Allen Key to fit top mount. Recessed 22mm Spanner. 13mm Socket. Jack and axle stands. Spring Compressors.


Parts needed: Strut Top Mount Bearing Sets. New Top seal Bushes (not essential)

How To in Order:

-Loosen wheel nuts.
-Jack front end up and place on two axle stands at front crossmember. Not on lower arms.
-Remove wheels and Take front brake Flexi out of clips.
-Goto top end and with lower arm at full extension use recessed spanner and allan key on long bars to break the threadlock (allan key with jack arm inserted works like a charm)
-Place Jack under lower arm.
-Use spring compressors to get spring to a compressed point to move on strut assembley
-Goto top remove 4 13mm nuts to hold strut to body. Then remove the large nut with the 22mm recessed spanner and allan key.
-Drop jack under lower arm and swing strut in the arch towards the passenger compartment.
-Grab top plate.
-Pop out old bearing assembly (dunt on ground with an extension bar)
-Assess condition and then be very scared at the speed you drove when they were that bad
-Press new assemblies in.
-Place plate back to top of strut and ensure spring plate is aligned with the coils
-swing strut vertically and pull damper end up to start the tread on the allen bolt.
- Jack assembly up. Then re-tighten 13mm holding nuts to top plate.
- Tighten Allen and 22mm bolt to as tight as required. Normally about 12mm of shown thread through top of assembly.
-Dump some Locktite on there to stop the nut shifting.
-release spring comressors (fear is advisable springs are nasty bastards)
-re-attach flexi into clip
-remove jack
-Put wheel back on
-Drop car down.

-Do other side as before.

Final thing here is to have a nice drink afterwards and possibly a cigarette if you are of the smoking persuasion. To enjoy the 10mins each side will take. After this Drive the car and make sure everything settles nicely, you'll notice about 60mph and above the car feels very solid, plus the steering is lighter. This last point also make you more likely to know what it is like driving a porsche off a dealers forecourt. (something I will do one day)

Hope this is of help to everyone. As I said in the tools the spring compressors and 22mm recessed spanner make all the difference for speed on this task.

Thanks for all the help.
Steve
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John Brown  



Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA

PostPosted: Thu Jul 12, 2007 1:20 am    Post subject: Reply with quote

Good show.

Couple of additional points:

If replacing the shock insert use the pipe wrench to remove the gland nut (shock retaining nut) BEFORE dropping the strut down and out of the upper mount. If the gland nut has been on for years and years and years it can be quite sticky. With the suspension at full droop (anti-sway disconnected) there is room to get at it around the spring. Once the nut is loose then continue as described. For particularly sticky and air chisel is the last resort. Actually, since new shocks should come with new nuts; chisel away.

Not all shock struts have an allen (internal hex) in the end. Some have a protruding 'flat' which will take a standard wrench. Some have nothing; in which case you almost HAVE to use an impact to loosen (and tighten). If you want to get fancy there is a tool made just for the allen style.

New replacement shocks should come with the correct nut and spacer if needed. Can't vouch for Monroe. (Monroe is NOT on my A list right now. MY Escalade shocks were COMPLETELY worn out with 40,000 miles! Not weak. Done. Kaput. Shot. Fini')
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