Engine mount bolt length

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kaysystems
Posts: 90
Joined: Mon Jan 14, 2013 1:57 pm
Location: Charlottetown, PEI, Canada

Engine mount bolt length

Postby kaysystems » Tue Jun 30, 2026 6:57 pm

The parts catalog shows the engine mount bolts, but I don't see the nuts. Are they self locking?
When I bought my bike they were ordinary nuts.

Thanks

David
1967 Narrowcase 250
2004 Ducati ST3
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graeme
Posts: 1059
Joined: Sun Mar 25, 2012 12:00 am
Location: Tasmania Australia

Re: Engine mount bolt length

Postby graeme » Tue Jun 30, 2026 9:21 pm

All the wide case bikes I’ve had all had plain nuts, not nyloc.

Graeme
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nalimugmug
Posts: 135
Joined: Mon Sep 12, 2011 3:40 pm
Location: South Glos UK

Re: Engine mount bolt length

Postby nalimugmug » Tue Jun 30, 2026 11:22 pm

Nyloc

Pics from some of my Mach 1s

Parts book item 330 states Elastic Stop-nyloc?

If you require bolt lengths ill measure that for you

Bob

DSC01142_1.JPG
ff.JPG
duccx2205.jpg
Mounting bolts.jpeg
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blethermaskite
Posts: 624
Joined: Thu Mar 01, 2018 1:06 am
Location: Scotland

Re: Engine mount bolt length

Postby blethermaskite » Wed Jul 01, 2026 3:14 pm

Not sure if its a wide or narrow case engine you are working with? my 74 Mk 3 350 which I purchased new came with 'nyloc' nuts on all the engine mounting bolts and I am pretty sure on just about everything else as well.
Cheers George
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Eldert
Posts: 832
Joined: Sun Nov 01, 2009 3:23 pm
Location: Hazerswoude Rijndijk Netherlands

Re: Engine mount bolt length

Postby Eldert » Wed Jul 01, 2026 7:09 pm

no nylock nuts but the higher nuts D x 1.5 i think . sometimes you need a 14 mm wrench but i dont recal if thats for the bolt or the nut .

Eldert
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nalimugmug
Posts: 135
Joined: Mon Sep 12, 2011 3:40 pm
Location: South Glos UK

Re: Engine mount bolt length

Postby nalimugmug » Thu Jul 02, 2026 12:17 pm

Lurking in a dark corner I believe I found one of the original nuts that I removed before doing a complete restoration on my bikes.

As Eldert correctly mentioned the originals are not Nylok.

A 13mm open ended spanner will not fit this nut, however a 14mm spanner will , but with some slack.
Nut.jpeg
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