1968 Triumph HeraldFACTORY OEM SERVICE PROCEDURE

Lucas Distributor Advance Specifications

NOTE: FOR ENGINE RPM & DEGREES, MULTIPLY SPECIFICATIONS BELOW BY 2.
LUCAS DISTRIBUTOR ADVANCE SPECIFICATIONS

Distributor Part Number Lucas Centrifugal Advance (Dist. Degrees & RPM) Vacuum Advance (Dist. Degrees & In. of Hg.)
Deg. RPM Deg. RPM Deg. RPM Deg. RPM Deg. In. Hg. Deg. In. Hg. Deg. In. Hg.
40480 0-2 200 8 1/2-10 1/2 750 12 1/2-14 1/2 2000 13-15 2700 1/2-2 1/2 4.75 .......... .......... 5-7 9.5
40528 1/2-3 1/2 450 11-13 1100 14-16 1700 18-20 2500 0-4 4.0 10-12 1/2 1 1.5 11-13 18.0
40543A 2-4 500 7-9 1000 8 1/2-10 1/2 1500 10-12 2000 0-1/4 3.0 2 1/4-4 1/4 9.0 6 1/2-8 1/2 15.0
40544A 0-2 500 9 3/4-11 3/4 1500 12-14 2000 12-14 2500 0-1 5.0 4 1/4-6 1/4 9.0 7-9 13.0
40545A 1/2-2 1/4 50Q 10 1/4-12 1/4 1500 12 1/2-14 1/2 2000 13-15 2500 1/2-2 1/2 5.0 6-8 9.0 9-11 15.0
40546B 1-3 500 7 1/2-9 1/2 1000 8 3/4-10 3/4 1500 10-12 2000 0-1/4 3.0 2 1/2-4 1/2 9.0 6-8 15.0
40557 1-3 500 15-17 1400 22-24 2500 24-26 3500 1 1/2-5 6.5 9 1/2-11 1/2 13.0 10-12 20.0
40561 0-2 600 5-7 1/2 1000 12-14 2300 12-14 2800 Begin 5.0 .......... .......... 12 12.0
40576 1/2-3 1/2 450 10-12 1000 15-17 2250 17-19 3200 1/2-3 6.5 6-8 12.0 8-10 20.0
40578 1/2-3 1/2 650 10-12 1300 14-16 2400 16-18 3500 1 1/2-5 6.5 9 1/2-11 1/2 13.0 10-12 20.0
40617 0-2 1/2 450 .......... .......... 7-9 850 12 2000 0-3 7.5 6-8 1/2 13.0 7-9 20.0
40631 0-1 800 1/4-3 1/4 1200 3 3/4-5 3/4 1600 6-8 2000 0-2 4.0 3 1/2-5 1/2 8.0 8 1/2-10 1/2 16.0
40640 1-3 500 10-12 1300 14-16 2300 17-19 3000 0-1/2 6.0 4 1/2-7 1/2 14.0 6-8 25.0
40649 0-1 375 1/2-2 1/2 550 8 1/2-10 1/2 1500 16-18 2375 1/2-2 1/2 6.5 4-5 12.0 4 1/2-5 1/2 18.0
40649AB 0-1 375 1/2-2 1/2 500 8 1/2-10 1/2 1500 16-18 2375 2 1/2-5 12.0 .......... .......... 5-7 1/2 14.0
40665 1 1/2-2 1/2 400 6-8 800 8-10 1100 11-13 1500 0-1/2 4.0 6-9 12.0 7-9 15.0
40743, 91 1/2-2 1/2 450 4-6 1000 6-8 1500 8-10 2000 0-1/2 2.5 3 1/2-5 1/2 10.0 5 1/2-7 1/2 15.0
40755, 90 0-1 450 1-3 600 7-9 1050 14-16 1600 0-1/2 3.5 6-8 1/2 8.0 10-12 1/2 12.0
40795 0-2 350 5-7 600 9-11 800 .......... .......... 1 3.0 2 1/2 5.0 2 3/4 6.0
40819 0-1 1/2 300 3-6 500 11-13 2600 14-16 3500 .......... .......... .......... .......... .......... ..........
40828 0-1 500 5-7 800 6 1/2-8 1/2 1250 8 1/2-10 1/2 1800 0-1/2 6.0 2 1/2-5 1/2 9.0 7-9 20.0
40842 0-1 400 1/2-2 1/2 700 4-6 1350 7-9 1900 1 1/2 2.0 7 1/2 7.0 8 10.0
40856 0-1 650 7 1/2-9 1/2 1400 12-14 2150 13 1/2-15 1/2 2500 0-1 5.0 6-8 9.5 11-13 20.0
LUCAS DISTRIBUTOR ADVANCE SPECIFICATIONS (Cont.)

Distributor Part Number Lucas Centrifugal Advance (Dist. Degrees & RPM) Vacuum Advance (Dist. Degrees & In. of Hg.)
Deg. RPM Deg. RPM Deg. RPM Deg. RPM Deg. In. Hg. Deg. In. Hg. Deg. In. Hg.
40857 0-1 600 5-7 900 9 1/2-11 1/2 1600 13 1/2-15 1/2 2500 1/4-2 1/2 6.0 6 1/2-8 1/2 11.0 9-11 20.0
40885 1-3 500 10-12 1300 14-16 2300 17-19 3000 0-1 6.0 4 1/2-7 1/2 14.0 6-8 25.0
40886 1/2-2 1/2 400 6-8 800 8-10 1100 11-13 1500 0-1/2 7.0 6-9 12.0 7-9 15.0
40897 3 300 4 1/2 450 7 1/2 800 10 1100 Begin 5.0 .......... .......... 10 13.0
40916 3 300 4 1/2 500 9 1500 12 2200 Begin 4.0 .......... .......... 8 12.0
40918 1/2 400 1-3 600 13-15 2200 15-17 3000 Begin 4.0 .......... .......... 10 13.0
40919 1/2 400 2 600 14 2200 16 2750 Begin 4.0 .......... .......... 10 13.0
40966B 1-4 550 5-8 750 11-13 1700 14-16 2200 Begin 5.0 .......... .......... 8 12.0
40967 0-1 500 5-7 900 10-12 1850 11-13 2100 0-1/2 4.0 5 1/2-8 9.0 9-11 20.0
40975 0-1 400 8 1000 13 1/2 2000 15 2500 0-1/2 4.0 5 1/2-8 9.0 9-11 20.0
41060A.65A 0-1 1/2 525 5-7 800 6 1/2-8 1/2 1250 8-10 1/2 1800 0-1/2 6.0 2 1/2-5 1/2 9.0 7-9 20.0
4-1134, 51 6-8 800 7 1/2-9 1/2 1000 9-11 1400 13-15 2750 .......... .......... .......... ..... .......... ..........
41198 0-1/2 300 2-4 500 5-7 1000 10-12 2800 Begin 5.0 .......... ..... 6 8.0
41201 0-3 350 6-8 600 8-10 1300 12-14 2650 Begin 2.0 .......... ..... 6 6.0
41202A (1) 0-1 450 5-7 900 10-12 1850 12-14 2300 0-1/2 4.0 5 1/2-8 9.0 9-11 20.0
41202B (2) 0-1 450 4-6 850 6-8 1500 9-11 2500 0-1/2 3.0 2 1/2-7 6.0 7-9 15.0
41214, 57 2-4 800 3-5 1000 5 1/2-7 1/2 1400 9-11 2000 .......... ..... .......... ..... .......... ..........
41237 0-1 500 6-8 800 14-16 2000 16-18 2800 0-1/2 4.0 2 1/4-4 1/4 8.0 6-8 15.0
41238 5-7 750 5-7 1400 10-12 2400 11-13 3000 .......... .......... .......... ..... .......... ..........
41267 1/2-2 1/2 650 8-10 1200 9 1/2-11 1/2 1600 11-13 2000 0-1 2.0 3-6 5.0 6-8 12.0
41275 1-3 1/2 400 3 1/2-6 500 7-9 1250 9-11 1750 0-1/2 6.0 4 1/2-7 1/2 10.0 9-11 20.0
41278 (3) 0-1 450 6 1/4-8 1/4 1000 10-12 1900 12-14 2400 .......... ..... .......... .......... ..... ..........
(1) Vacuum Retard 0-6° at 4-14" of Hg.
(2) Vacuum Retard 0-9° at 2-15" of Hg.
(3) Vacuum Retard 0-6° at 4-14" of Hg.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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