Workshop Manuals

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Lotus Service Bulletin
Class 111
Number 1973/28
Type All Models
Date 08.10.73
Title: Workshop Manuals
Reason: To give amendments where shown
Action:

Amend the Manuals as indicated:

Contents

ELAN, 2, EUROPA TWIN CAM - Technical Data

Under the heading of 'Cylinder Head', ADD:

Cylinder head identification

  • Small valve 'S' (also Federal Big Valve)
  • Big valve 'N' or W (also S/E Stromberg)

Cylinder head depth

  • Small valve 4.638/4.643in.(11.78/11.79cm)
  • Big valve 4.598/4,603in.(11.68/11.69cm)

Maximum permissable metal removal

  • Small 1 valve .045in. (1.143mm.)
  • Big valve .010in. (.254mm.)

Under the heading of 'Cylinder Head', ADD:

Valve Seat Inserts - Outside diameter of insert:

Inlet Exhaust
Standard 1.6245/1.6235in. 1.4995/1.4985in.
.005 in. oversize 1.6295/1.6285in. 1.5045/1.5035in.
.010 in. oversize 1.6345/1.6335in. 1.5095/1.5085in,
.015 in. oversize 1.6395/1.6385in. 1.5145/1.5135in.

Bore in head:

Inlet Exhaust
Standard 1.6210/1.6200in. 1.4960/1.4950in.
.005in. oversize 1.6260/1.6250in. 1.501011.5000in.
.010 in. oversize 1.6310/1.6300in. 1.5060/1.5050in.
.015 in. oversize 1.6360/1.6350in. 1.5110/1.5100in.

Under the heading of 'Valve Guides', ADD:

Outside diamater of guide:

Inlet & Exhaust
Standard .50001.5005 in.
.001 in. oversize .50101.5015 in.
.005 in. oversize .50501.5055 in.
.006 in. oversize .5060/.5065 in.

Bore in head:

Inlet & Exhaust
Standard .4990/.4995 in.
.001 in. oversize .50001.5005 in.
.005 in. oversize .5040/.5045 in.
.006 in. oversize .50501.5055 in.

ELAN and 2 Only - Technical Data

  1. Under the heading of 'Torque Loadings', AMEND: Hubs:
    Wheel nuts (octagonal) 200/220 lbs. ft. (27.65/30.42kg.m.)

ELAN Only - Technical Data

  1. Under the heading of 'Torque Loadings', AMEND: Engine
    Crankshaft - Connecting rod (big end) caps
    'L' type 25lbs.ft. (3.45kg.m.)
    'C' type 44/46 lbs.ft. (6.08/6.36kg.m.)

EUROPA TWIN CAM Only - Technical Data

  1. Under the heading of'Torque Loadings', ADD: Engine
    Camshaft cover nuts 7 lbs.ft. (.96kg.m.)

ELAN, 2, EUROPA TWIN CAM - Section 'E' (Engine)

  1. Page 29 in Elan and 2, page 28 in Europa Twin Cam, AMEND: Water Pump - to Replace - paragraph 2, delete last sentence and insert:
    Fit new pump seal on the slinger bush with the carbon thrust face towards the thrust face of the disc (Part No. A026 E 6127Z), so that they are in abutment to each other. The rubber face of the disc is nearest to the impeller, Press assembly into housing.

ELAN and 2 Only - Section 'E' (Engine)

  1. Page 14 in 2, page 16 in Elan, ADD; Cylinder Head - To Replace - paragraph 2:
    New cylinder head bolts (Part No. X026 E 0027A) fitted in Production from Engine No. 18820.

EUROPA TWIN CAM Only - Section 'E' (Engine)

  1. Page 9 - Fig. 3, AMEND: 20 mark on flywheel to TDC
  2. Page 29 - Top of page, ADD: BEFORE paragraph 1, insert the following:
    If a new oil dipstick tube has been fitted, it is important that the vertical height, measured from the sump mounting flange to the top centre of tube, is 4.10 in. (10.47 cm.), if the correct oil level is to be maintained.

EUROPA TWIN CAM Only - Section 'F' (Transmission)

  1. Page 8 - After paragraph 4, ADD: 5. Check end-float of shafts AFTER the pin has been fitted (see Technical Data).

ELAN Only Section V (Braking System)

  1. Page 6 Fig. 3, AMEND. Delete arrow from small (clutch) reservoir and add to large (brake) reservoir.
  2. Page 21 - Fig. 15, AMEND: Alter 2.5 in. (5.1cm.) dimension to read 2.75 in. (6.98 cm.)

ELAN, 2, EUROPA TWIN CAM - Section 'L' (Fuel System)

  1. Page 68 in Elan, page 72 in 2, page 16 in Europa Twin Cam, AMEND: Dellorto Carburetters -To Replace - paragraph 2, 3rd sentence to read:
    Tighten the eight nuts progressively until a .040 in. (1.02mm.) clearance exists between the carburetter flanges and the spacers.

ELAN and 2 Only - Section V (Fuel System)

  1. . Page 17 in Elan, page 18 in 2, AMEND: Weber Carburetters - To Replace - paragraph 2, 5th line to read:
    until a .040 in. (1 .02mm.) clearance exists between the carburetter flanges and the spacers.
  2. Page 16 - Fig. 6 in Elan, page 19 - fig. 7 in 2, AMEND: Alter dimension to read .040in. (1.02mm.)

ELAN Only - Section 'Q' (Clutch)

  1. Page 6 - Fig. 4, AMEND: Delete arrow from large (Brake) reservoir.

EUROPA TWIN CAM Only - Section 'Q' (Clutch)

  1. . Under the heading of Clutch Adjustment, AMEND: Delete paragraph 4 completely. Alter paragraph 5 to read paragraph 4.
    4. With a second operator inside the car, fully depress the pedal and check total movement at lever end does NOT exceed .73 in. (18.54mm.)
    NOTE: Illustration should be amended to delete the turnbuckle on the cable and to a locknut outboard of the existing nut.