 Engine & Transmission Bolt Sizes?, Need Correct size of Bolts for Engine mount and Tranny mount |
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| Vysoc |
 Jan 15 2010, 09:11 AM
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#1
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Vysoc  Group: Members Posts: 586 Joined: 27-August 09 From: Young Harris, Georgia Member No.: 10,737 Region Association: South East States  |
Hello,
1975 914-4 2.0 D-Jet FI After 10 years the engine and transmission were reunited with the chassis. I am not really happy or confident with the bolts and nuts holding the Engine and Transmission. They are OK but origninal and after all the work I have done I want new Bolts, washers and nuts. My question would be what is the actual size of the Bolt for the Engine mount (2) and the Transmission mount (2). Also what is the recommendation for nuts & washers, Lock washers, nylock nuts etc... Thanks for your help, Vysoc |
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| detoxcowboy |
Jan 15 2010, 09:25 AM
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#2
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Senior Member Group: Members Posts: 1,294 Joined: 30-January 08 Member No.: 8,642 Region Association: Africa |
QUOTE(Vysoc @ Jan 15 2010, 07:11 AM)  Hello, 1975 914-4 2.0 D-Jet FI After 10 years the engine and transmission were reunited with the chassis. I am not really happy or confident with the bolts and nuts holding the Engine and Transmission. They are OK but origninal and after all the work I have done I want new Bolts, washers and nuts. My question would be what is the actual size of the Bolt for the Engine mount (2) and the Transmission mount (2). Also what is the recommendation for nuts & washers, Lock washers, nylock nuts etc... Thanks for your help, Vysoc Best way is to take the bolt to your hardware store (loose nuts and bolt secton) and find a know thread pitch and size nut that works. Then measure the bolt ect. Also very important is the hardness which is usually stamped on the bolt (10.9 ect. or higher, maybe 8.8 but I think 10.9 for those bolts.) Ace Hardware has metrics and Hardness ect.) Or call Auto Atlanta as they have the nuts and bolts for sale.. I think nyloc and a lock washer would be good. |
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| kconway |
Jan 15 2010, 09:40 AM
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#3
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Senior Member Group: Members Posts: 1,347 Joined: 6-December 04 From: Monrovia, CA Member No.: 3,231 Region Association: Southern California |
PET Says:
Engine Carrier Bolt = M10 x 85 Washer 10, 5 Nut 10, 5 Self Locking Transmission Bolt = M12 x 1.5 x 125 Big Washer = Porsche PN 914 375 239 00 Nut = M12 x 1.5 |
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| detoxcowboy |
Jan 15 2010, 09:55 AM
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#4
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Senior Member Group: Members Posts: 1,294 Joined: 30-January 08 Member No.: 8,642 Region Association: Africa |
Yep that is the sizes, I just could not remeber anymore, You still want to get a rated hardness though.. Automotive hardness seem to start at 8.8 though I know there are smaller less hard used in some places ect.
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| Red72 |
Feb 27 2016, 09:30 PM
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#5
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Newbie Group: Members Posts: 25 Joined: 26-January 15 From: Simcoe, Ontario Member No.: 18,358 Region Association: Canada |
Sorry for reviving an old thread, but are these sizes the same for all years/transmssions? Replaced my transmission mounts tonight, and all went well...got to the engine mounts, and it struck me that a) the bolts were probably only rough equivalents installed by a PO, and b) diameter seemed quite a bit smaller than the ID of the engine mount.
Stephen |
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