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> 911S strut assemblies, Inserts don't fit
framos914
post May 14 2019, 09:31 PM
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Need help. My 75 2.0 has worn strut inserts, PO replaced front struts with what I believed were 1977 911S Koni struts part #911 341 079 16 stamped on it. Bought inserts Koni 86-1942. Problem is they bottom out before going in far enough to secure them with the round nut.
Could I have 72-74 911S struts? Did they have the same part number? And are those inserts (86-1638) just a little shorter to seat further down. The 1942s seem to be just about 12mm too long, body of the 1942 is 374mm long.

Tried getting info from a few places including Koni but no luck.
Thanks
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mepstein
post May 14 2019, 09:47 PM
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Off the top of my head, it sounds like you are trying to put inserts made for 3 1/2" struts into a 3" strut. The later strut bodies are taller than the earlier ones.
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framos914
post May 14 2019, 09:58 PM
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QUOTE(mepstein @ May 14 2019, 08:47 PM) *

Off the top of my head, it sounds like you are trying to put inserts made for 3 1/2" struts into a 3" strut. The later strut bodies are taller than the earlier ones.

The struts are 3.5 inch, It also has the 911S aluminum calipers not the M calipers which I believe are the 3 inch.Even though the the receipt in the POs documents say 1977 suspension, it could be wrong. These components were installed on this car way back in 1980.
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infraredcalvin
post May 14 2019, 10:01 PM
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it appears you have even earlier struts for 914-6/ 911 and 912, 68-72?

There is a superseded part number you get when searching which may be what’s fouling up your search.
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Larmo63
post May 14 2019, 10:04 PM
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Pictures might help us here, too.......?
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framos914
post May 14 2019, 10:13 PM
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I'll try to get pictures tomorrow if the mechanic at the shop doesn't sort it out. Getting the 86-1638 Konis tomorrow but cant find those dimensions to see if the're a bit shorter.
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porschetub
post May 14 2019, 11:47 PM
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I ordered replacements for what I knew were MY for my alloy crossbar,turned out I was right as the struts are the same era (911 SC) honestly had no idea.
Took a gamble really cause the OP also told me my gearbox was ok (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) .
Part numbers change but those better than me have spoken,I will say I have been bitten before on wrong numbers.
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914Sixer
post May 15 2019, 06:02 AM
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I have a set of Koni 86-1942 and I have test fitted them in stock 73-on Boge Struts. You have to use the Boge nut but they fit. I have a set of 86-1647 which are made different but fit the same.

One on right is the 1942 and left one is 1647. BOTH are the same length. 14 1/2 inces or 37 cm.


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sixnotfour
post May 15 2019, 08:56 AM
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real Koni Struts.. require a unique shock insert ...call paragon products Koni 86-1638

https://www.paragon-products.com/Koni-Strut...8-p/86-1638.htm
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framos914
post May 15 2019, 03:38 PM
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QUOTE(sixnotfour @ May 15 2019, 07:56 AM) *

real Koni Struts.. require a unique shock insert ...call paragon products Koni 86-1638

https://www.paragon-products.com/Koni-Strut...8-p/86-1638.htm

Thanks
Spoke with Jason at Paragon, he is 100% sure there is something at the bottom of the strut keeping the insert from dropping all the way down. The mechanic disagrees so I'll follow Jason's advice, pick up the car and take it apart myself.
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mepstein
post May 15 2019, 03:57 PM
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If it’s just one strut insert that won’t go down then I’m betting on a bent strut. If it’s both sides then I got nothing.
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sixnotfour
post May 15 2019, 09:38 PM
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real Koni Strut housing /Spindles are special
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framos914
post May 16 2019, 12:02 AM
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Passenger side strut
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framos914
post May 16 2019, 12:03 AM
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framos914
post May 16 2019, 12:05 AM
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framos914
post May 16 2019, 12:11 AM
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New 861942 insert
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914Sixer
post May 16 2019, 06:12 AM
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I have never seen that type of Koni insert. The numbers I am seeing says it is 75-up strut. Made week 34 1974. Wondering about spacer in bottom of tube.?
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infraredcalvin
post May 16 2019, 07:50 AM
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Something has to account for that tab at the bottom of the original insert.
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framos914
post May 16 2019, 10:23 AM
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The tab has two sides, I think on the original the shaft gets pushed down manually and catches on something to make ride adjustments. Next I'll take the strut completely out to have a good look in the housing and make there's nothing inside the housing
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sixnotfour
post May 16 2019, 01:09 PM
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your missing some pieces,,ie still in tube..


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