Lotus Elan

1969 Elan s4 timing/starting issues

PostPost by: vstibbard » Sat Jun 13, 2020 12:54 am

It sounds like when you adjusted the tension you wound the tensioner in too far.

The workshop manual gives a clear visual method of checking chain tension with the cam cover off.

V
vstibbard
Fourth Gear
Fourth Gear
 
Posts: 637
Joined: 22 Jul 2008
Location: Sydney, Australia

PostPost by: vxah » Sat Jun 13, 2020 7:44 am

You don’t say exactly where the cam sheared off? It’s going to be quite important to understand what caused the failure in order to prevent a repeat!
I’m guessing you didn’t build the engine so could the po have made a mistake with previous work? Camshafts have been known to break but it is unusual for a standard set up to do this, a keen eye may be needed to look over your engine?
vxah
Third Gear
Third Gear
 
Posts: 326
Joined: 08 Nov 2012
Location: Cambridge UK

PostPost by: alan.barker » Sat Jun 13, 2020 8:17 am

I've heard of people breaking camshafts when tightening down camshaft caps :oops:
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
alan.barker
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2466
Joined: 06 Dec 2008
Location: BRITTANY FRANCE

PostPost by: rgh0 » Sat Jun 13, 2020 8:23 am

There were 3 types of standard Lotus camshaft fitted to the elan and they can be identified from the grooves on the hub where the sprocket fits

No groove - standard "B" type cam
1 groove - SE "C" type cam
2 grooves - Sprint "D" type cam.

Replacement cams of these types can be sourced through the usual Elan parts suppliers - e.g. Dave Bean and others
User avatar
rgh0
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 7600
Joined: 22 Sep 2003
Location: Melbourne, Australia

PostPost by: nmauduit » Sat Jun 13, 2020 8:38 am

alan.barker wrote:I've heard of people breaking camshafts when tightening down camshaft caps :oops:
Alan


it's easy to apply a great bending leverage if the front locating flange is not properly located into the head recess and the middle caps are torqued in...
S4SE 36/8198
User avatar
nmauduit
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1550
Joined: 02 Sep 2013
Location: France

PostPost by: alan.barker » Sat Jun 13, 2020 10:36 am

There are 4 different Camshafts. Don't forget the "E " type also plain no grooves.
Ref Miles Wilkins page 181 "Lotus Twin-Cam Engine"
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
alan.barker
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 2466
Joined: 06 Dec 2008
Location: BRITTANY FRANCE
Previous

Total Online:

Users browsing this forum: 1owner69Elan, saildrive2001 and 17 guests