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11-15-2019, 11:30 AM #76
You have it right, Kevin. That is the right way to confirm that the TDC mark and the 10˚ BTDC mark are in fact correct. For readers, if you don't confirm that the TDC and 10˚ BTDC timing marks are correct, you are baking the incorrect timing (from the incorrect timing cover indexing) into the cake so to speak.
When you use a TDC stop and a Degree Wheel you are correctly "calibrating" the timing marks on the timing cover. You can either use a small dab of paint or put a small notch on the damper opposite the timing cover TDC marking for "True TDC" after you have correctly located it. If you choose to notch the damper, you will need to mark it, again with a dab of paint, and pull the damper to do it. The small dab of paint and leaving the damper on is far less labor intensive. Once you have TDC correctly identified then you need to check the positioning of the 10˚ BTDC mark on the front cover — for all the same reasons.
Time to turn the crank again, this time to 10˚ BTDC on the degree wheel. If your new TDC mark on the damper does not line up with the 10˚ BTDC mark on the timing cover, you have a timing cover whoops. Now without moving anything place a paint mark or scribe mark on your timing cover opposite the the TDC mark on your damper. Your new mark is the real 10˚ BTDC position. Time to start the engine and see how much you need to adjust the MS3Pro Tooth #1 Angle (BTDC) parameter.
When you start the engine and check the timing you will adjust the MS3Pro Tooth #1 Angle (BTDC) parameter until your new 10˚ BTDC mark on the timing cover and TDC mark on the damper line up — and you will be done.
In the FWIW bucket a mismatch of 8˚, like you experienced Mike, is virtual certain indicator that the factory marks are off and you need to recalibrate both the TDC and 10˚ BTDC marks before they are useable.
Last edited by eschaider; 11-15-2019 at 06:32 PM. Reason: Spelling and Grammar
11-15-2019, 06:03 PM #77
Great info as always!
I’ll be certain now to check this when I get my engine on the stand and am ready to start degreeing/phasing process.
11-15-2019, 06:30 PM #78
Got the Ethanol wires up and running. So that is pretty cool and we test run doing the timing on my spare engine.
11-15-2019, 06:47 PM #79
You will LOVE having this option! I predict that it will save you having to walk to an E85 gas station more than once!
As an FYI, I also checked the E85 measurement that MS shows to a E85 test kit and they were both spot on with each other.
11-15-2019, 08:45 PM #80
Very nice and very clean job — as usual, Josh.