Lotus Elan

ARP differential crownwheel bolts

PostPost by: 2cams70 » Mon Jul 09, 2018 2:24 am

Hi Guys,

I am looking to replacing the crown wheel bolts on an English differential centre as part of a rebuild given that it is not unknown for these to break. I am aware that ARP x/flow flywheel bolts can be used where an LSD is being fitted because the LSD's typically have a thicker mounting flange compared to the standard open differential hence requiring a longer than standard bolt.

My question is what bolts are people using where the standard open differential is being retained? I've checked and the ARP flywheel bolts at 0.90" long are too long in this application. The only other bolts I can find in the ARP catalogue are these https://arp-bolts.com/kits/ARPkit-detai ... ordID=3317 (P/N 742-0750) which are the same length as OEM. The problem with these is that they are fully threaded rather than shouldered. I believe it is better practise to use shouldered (like OEM and the ARP flywheel) bolts in this application. I believe new OEM bolts are now obsolete.
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2015 Honda City 5spd.
Fourth Gear
Fourth Gear
Posts: 938
Joined: 10 Jun 2015
Location: Australia

PostPost by: CBUEB1771 » Mon Jul 09, 2018 4:58 pm

TTR supply NAS-specification bolts for the purpose:
Russ Newton
Elan +2S (1971)
Elite S2 (1962)
User avatar
Coveted Fifth Gear
Coveted Fifth Gear
Posts: 1684
Joined: 09 Nov 2006
Location: Boston, Massachusetts USA

Total Online:

Users browsing this forum: No registered users and 4 guests