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911Time's Porsche 991 - How to Replace Engine Lid Gas Struts

911Time

Suzuka
Joined
25 Sep 2018
Messages
1,172
Hi all,

Been tinkering the past few weeks and found the gas struts on the engine lid of my 8 year old 991, were beginning to weaken. After the third time of it coming down on my hand, I got cheesed off and decided to order a set.

I know most owners of the modern 911s don't tend to work on their own cars BUT it's a VERY SIMPLE fix, so for the sake of anyone who fancies some easy DIY rather than paying a dealer, I thought I'd write it up.

The OEM struts are made by Stabilus - Part No: 991 512 551 00. Ejection Force: 130 Newtons. Length: 168mm.

IMG-20210629-170746378-2.jpg


As my car's under the extended warranty, I went original at £24.25ea - crazy I know because you can buy other brands at prices from £10ea! Bought mine from Design911, who were very prompt and I had them within 24hrs.

https://www.design911.co.uk/fu/prod133528/Stabilus-Rear-Lid-Damper-Porsche-991/

Tools
Small flat bladed screwdriver, large flat bladed screwdriver, some kitchen roll, a couple of cloths.

Difficulty
Novice - as easy as it comes.

Here we go

1: Open the engine lid - it's very hard to do it otherwise :lol:

IMG-20210629-170746378-2.jpg


2: Place some cloths around the base of the hinge and fans - whilst unlikely, this is to prevent the possibility that any parts (such as a clip) will fall into the engine bay.

IMG-20210629-171203121-2.jpg


3: Holding the lid up with your left hand, insert the end of the small screwdriver beneath the edge of the metal clip on the upper end of the strut (the clip holds the end of the strut onto the ball head) and lever it up, against the plastic, in order to lift the clip out of the plastic. Once the clip's moved out slightly, you can use the large screwdriver to lift it further

You don't need it to come out completely, just lifted away from the plastic head.

4: Repeat the same procedure on the bottom clip.

IMG-20210629-171357779-2.jpg


5: Once the clips have been lifted, you'll be able to grasp the top/bottom of the strut and pull it away from the ball fixings.

IMG-20210629-171655191-2.jpg


6: Using some kitchen paper, clean the ball fixings of any dirt.

IMG-20210629-171927288-2.jpg


7: The new parts usually come with a small amount of grease inside the ends but here I've added a little Teflon grease.

IMG-20210629-172258042-2.jpg


8: Noting from the other (existing part) which end is up and down, simply pull the plastic end cups of the new struts onto the balls. Being greased they should pull on quite easily but if not, just tease out the metal clips a little - but remember to push them home before you finish up.

IMG-20210629-174504660-2.jpg


and that's it - job done and no need to pay ££s to a dealer for a simple job!

Hope that helps :)
 
Very useful ! Will give this a try now that I know how.

Keep em coming :thumb:
 
Lordturpin said:
Very useful ! Will give this a try now that I know how.

Keep em coming :thumb:

No problem :thumb:
 
very useful and thanks for taking the time to post.

P.S Mine were replaced under warranty by OPC !
 
TurboSandGT4 said:
P.S Mine were replaced under warranty by OPC !

That's interesting. If you don't mind my asking, how old was your car when the struts were replaced and have they only been replaced once during the cars life?
 
mine is a 2013, had them replaced last year whilst they fixed turbo actuator. I didnt even ask!
 
TurboSandGT4 said:
mine is a 2013, had them replaced last year whilst they fixed turbo actuator. I didnt even ask!

Good result! From what I've heard some OPCs seem to consider these a wear and tear item, whereas others seem to wave it through under the warranty - as my preferred OPC is miles away, I chose to do it myself.
 
I had mine replaced under warranty too this year. My cars a 2013 and I asked for them to be replaced.
 
Mine is also a 2013 car they were identified as failing and initially claimed they failed due to a rear end accident a few weeks prior to service I challenged that along with the repairer and was changed under warranty! I've owned the car 18 months so not sure if they've been changed previously!
 
Mine had failed also on my 2015 GTS. Quoted £200 by OPC, did myself for £60 in the time it takes to boil a kettle.
 
Mine have just started to show signs of failure with the engine lid slowly falling down (8 years old), especially after washing the car. This is a very useful post Mark, using your tips I too have now changed mine. A 5 min job. Only thing I would add is the importance of removing/ loosening the small metal clips around each end of the gas strut. These firmly hold the strut onto each ball socket. When I first glance read your post I thought the small clips were part of the main cup on the gas strut, it was only on closer inspection and a proper read of your post and looking at the pictures much closer I really saw what you meant and why you needed the small bladed screw driver ... dooh. Once the penny dropped its a 30 second job.

Thx
Jungle
 

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Glad it was some help mate, though it does help if you read all the instructions first :lol: :lol:

I think the ones on my bonnet are on the way too, so looks like that'll be the next job. Tried to get a bag out of the boot last week and the car tried to eat me :D
 
2015 991.1 GTS, my rear deck lid struts were failing.

It's as simple as described.
:thumbs: thanks for posting OP.
 
pzero said:
2015 991.1 GTS, my rear deck lid struts were failing.

It's as simple as described.
:thumbs: thanks for posting OP.

You're welcome - thanks for the appreciation! :thumb:
 
WHAT....Do you mean to tell me that there is actually an engine hiding in there somewhere... :?:

Good job Mark, practical hints and tips are ever worthwhile... :thumb:
 

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