[Healeys] Timing mark

warthodson at aol.com warthodson at aol.com
Wed Apr 24 08:36:11 MDT 2019

If the timing light you recently purchased is a "dial back to zero type" then this is the procedure I use:
Make sure there is a clearly visible mark at zero (0), I.E. TDC (top dead center) on the harmonic balancer. Make sure you can identify it when the engine is running & not get it confused with the one you put on at 15 degrees BTDC. 
Disconnect the vacuum advance tube from the distributor & start the engine. Have someone bring the engine up to about 3500RPM. This RPM should assure that the distributor is at the full mechanical advance. Turn the dial on the timing light until the TDC mark on the damper aligns with the pointer on the engine. Read the number of degrees advanced on the dial of the timing light. I usually set mine at or near 32 degrees full advance. Rotate the distributor to achieve the full advance you desire.  
Let the engine idle and without changing the distributor position check the advance at idle. Mine is 12-15 degrees at 900 RPM. 
Gary Hodson

-----Original Message-----
 From : simon. lachlan <simon.lachlan at alexarevel.plus.com>
To: Healeys <healeys at autox.team.net>
Sent: Wed, Apr 24, 2019 7:22 am
Subject: [Healeys] Timing mark

#yiv1861619980 #yiv1861619980 #yiv1861619980 -- filtered {panose-1:2 4 5 3 5 4 6 3 2 4;}#yiv1861619980 filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv1861619980 p.yiv1861619980MsoNormal, #yiv1861619980 li.yiv1861619980MsoNormal, #yiv1861619980 div.yiv1861619980MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv1861619980 a:link, #yiv1861619980 span.yiv1861619980MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv1861619980 a:visited, #yiv1861619980 span.yiv1861619980MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv1861619980 span.yiv1861619980MsoPlaceholderText {color:gray;}#yiv1861619980 span.yiv1861619980EmailStyle17 {font-family:sans-serif;color:windowtext;}#yiv1861619980 .yiv1861619980MsoChpDefault {font-family:sans-serif;}#yiv1861619980 filtered {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv1861619980 div.yiv1861619980WordSection1 {}#yiv1861619980 #yiv1861619980 I bought a ProRace Harmonic Balancer a few months back and installed it whilst attending to some other engine chores….new oil pump, engine mounts, reverting to SUs from Webers etc.  Soooo….I was given sensible advice to mark the 15° line on the balancer as the markings are virtually invisible once the thing’s installed, let alone spinning at +/- 1,000rpm.   Now for the confession. The car’s not been running brilliantly….some hesitation, particularly under load, from +/- 4,000 rpm. Leaving out fuel issues for the sake of this discussion, I was thinking about the timing again. And I know that it’s been showing 15° BTDC with my brand new timing light. But I was still not sure so I looked at the photo of my painted timing mark. It shows that I managed to put the paint on the 16 mark. Now, 1° isn’t a lot but I can foresee the potential of making it worse when I take up the lamp again.   My question is this. What do I dial into the timing light to account for the mark being 1° out? (If I go the wrong way, I’ll be 2° out).Thanks,Simon_______________________________________________
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