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Re: 216 Static timing.
tclederman #1329640 Sat Oct 12 2019 07:27 PM
Joined: Oct 2015
Posts: 28
N
Wrench Fetcher
This is what the timing marks look like on my 216 - It's in a 1937 truck.

So the line between the U and C is TDC? and the BB is 5 degrees BTDC?

I could do the math, but what is the V mark used for?

Jim

Attached Files
timing marks.JPG (311.74 KB, 183 downloads)

1935 QD 1.5 ton stake bed
1937 SD 1.5 ton stake bed
1944 MS 1.5 ton stake bed
1946 PW 2 ton stake bed
Re: 216 Static timing.
neonman #1329641 Sat Oct 12 2019 07:40 PM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
Originally Posted by neonman
This is what the timing marks look like on my 216 - It's in a 1937 truck.

So the line between the U and C is TDC? and the BB is 5 degrees BTDC?

I could do the math, but what is the V mark used for?
No idea on the V mark

Jim

Correct. No idea on the V mark

Last edited by sstock; Sat Oct 12 2019 07:41 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 216 Static timing.
Silverado_9c3 #1329650 Sat Oct 12 2019 09:07 PM
Joined: Feb 2004
Posts: 21,650
H
Boltergeist
Valve adjustment


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: 216 Static timing.
neonman #1329671 Sun Oct 13 2019 12:11 AM
Joined: May 2005
Posts: 7,666
B
General Purpose
Originally Posted by neonman
This is what the timing marks look like on my 216 - It's in a 1937 truck.

So the line between the U and C is TDC? and the BB is 5 degrees BTDC?

I could do the math, but what is the V mark used for?

Jim


Time with the ball right on the pointer. The 5 next to ball indicates the ball (da BB) (O) is at 5 deg BTDC. Which is spec timing.
The UIC is actually "Upper Center" with a hash mark in between U and C. The hash mark is dead nuts TDC.

The triangle/V is a factory test spec mark.

What "math" are you talking about? There is no math involved.

Silverado: Did you get it timed? (Your Hijackers will be persecuted.)


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Re: 216 Static timing.
bartamos #1329677 Sun Oct 13 2019 12:45 AM
Joined: Oct 2015
Posts: 28
N
Wrench Fetcher
The math would have been figuring out how far before TDC the V is in case it was used for some timing, such as vacuum advance timing or centrifugal advance. I won't bother now I know it's not ignition related.

Jim


1935 QD 1.5 ton stake bed
1937 SD 1.5 ton stake bed
1944 MS 1.5 ton stake bed
1946 PW 2 ton stake bed
Re: 216 Static timing.
Silverado_9c3 #1329684 Sun Oct 13 2019 02:01 AM
Joined: May 2005
Posts: 7,666
B
General Purpose
Sorry, it was just a question. Not meant to disrespect. I see what you were thinking makes sense.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Re: 216 Static timing.
Silverado_9c3 #1329690 Sun Oct 13 2019 02:44 AM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
The math part is finding 5 degrees btdc on the flywheel. So 360 degrees divided by 139 teeth (6 volt flywheel) = 2.6 degrees per flywheel tooth


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: 216 Static timing.
Silverado_9c3 #1329700 Sun Oct 13 2019 03:26 AM
Joined: May 2005
Posts: 7,666
B
General Purpose
The ball/the BB/the round thing dimple symbol, is at 5° BTDC. The flywheel is marked by the factory with a BB ball at the specified optimal timing spot and the retard/advance number is stamped. If it says 5, then the ball is at 5°. Put the pointer on the ball. There is no math involved. The flywheel is also marked by the factory to show TDC if you need that. That's that line next to, or between, the UC, I call a hash mark, which is what it's called on calipers. No math involved. UC or UDC is what we now call TDC. The Triangle or V is used by the factory, not us, when they synchronize the motor. I hope we know that the teeth having nothing to do with timing. There is no measuring or math involved.
The procedure in the manual, that Kevin posted, has no math.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


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