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TR6 Does your TR6 have timing degree marks

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tdskip

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Hi guys - I'm trying to sort out the timing on the 1971 TR6 now that I've got her running again.

Paul has been a big help (thanks!), but in working through getting the timing right it appears that my damper is missing timing marks like the following;

aa6f_1.JPG


Do all years have these marks? Has a DPO replaced the correct damper with an incorrect one?

Mine only has two | | marks with a tapers triangle.
 
OR.....you could buy some Mr.Gasket timing tape. Get the Ford and Chevy versions, for the 6.375" and 6.750" diameter dampers. Yeah, I know that the TR6 is 6.550", but it's as close as you're going to get and with the numbers spread across that diameter, you will be within .005" of a degree, one way or another. Coupled with the actual flex in the damper, call it "on the money".

Strip off all paint on damper to bare metal, use the center of the hash marks as ZERO or TDC and install the tape with the numbers reading out as shown in the image above, or looking at you from the drivers side of the engine. Clear coat after being done.

As I explained in the PM, this is all subjective to how you want to tune the engine. I run mine at the max, less any pinging and set the idle down to normal. Works for me and the old timers. The reading just happens to be 14-16 BTDC that works best in my situation.
 
Another method is to calculate the length of arc based on the diameter of the damper and the number of degrees. Even though the outer edge of the damper is curved, the length of the arc per degree is so small it is reasonable to consider it to be straight.
If you choose to go this route. After you calculate the length for 1 degree you can mark the damper with a thin white line for each degree. Or as Alan mentioned scribe a line (possibly a shallow cut with a hack saw blade) for each degree. I have all the marks on my '75. I cleaned the surface then used a very fine paint brush to apply paint in each groove and number. i let it set for a few minutes then wiper it with a rag. This removed the excess paint, leaving only the paint that is in the depressed areas.
Another possibility is to apply a piece of double sided tape.(the good stuff, like what they use to hold trim on modern cars) One side to stick to a very clean damper surface. The outer side to hold a plastic or thin metal piece that has the marks and numbers engraved. Shim stock would be flexible and durable.
All of these suggestions would be best applied with the damper either of the engine or the engine out of the car where you have plenty of room to work.
BOBH
 
Here is what my damper looks like.

GyNCDMbQJcNiGWpnaPWqOHYSUTJY.jpg


Where should the straight edge of the timing market be aligned with. I've been thinking that should be lined up with the deeper visible line. There are two, the other one is nearer the indentation.
 
your best bet here is to do the old pull #1 plug and insert a dowel trick. that way when you rotate the engine you can feel where tdc is.

that's got to be better than relying on the marks that are there. at least you'll know it's right.
 
Brosky said:
Yeah, I know that the TR6 is 6.550"
Click to expand...

Assuming that 6.550 is the diameter, 20.57743 is the circumference, and 0.05715952777777777777777777777777777777........8 would then be the circumference distance for 1 degree.

So Paul's method makes great sense because it is somewhat relative anyway once your car's sweet spot is found who cares what the reading is.

Or you could easily machine the marks with a rotary indexing table.
 
OK - sorry for asking but should the straight edge of the timing indicator/arrow be on the left or right of the hash mark when looking at the car from the front towards the back?
 
tdskip said:
OK - sorry for asking but should the straight edge of the timing indicator/arrow be on the left or right of the hash mark when looking at the car from the front towards the back?
Click to expand...

I use the straight edge of the indicator and on the pulley line if I am using a line as the mark. The important thing is to be consistent with your method.
 
TD

At TDC the marker arrow if straight with the
heavy cut line. That is where I had the timing
static set in the first attempts to get Crypty
operational.

The car ran at that setting but runs much better
advanced 10-12 degrees.

regards and good luck

dale
 
So if the heavy mark is TDC, does that make the lighter hash mark to the the left (looking down as in the picture) of it 5 degrees BTDC?
 
tdskip said:
So if the heavy mark is TDC, does that make the lighter hash mark to the the left (looking down as in the picture) of it 5 degrees BTDC?
Click to expand...

That would be 4 degrees after. The picture is taken from the passenger side (just happened to be where the marks were) and the front of the car is towards the right of the picture. The rotation would be towards the top of the pictures so the TDC or 0 degrees would pass the timing indicator before the second mark.
 
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