timing pin and TDC dont match
- Thread starter kenparker
- Start date
Mitch//pa
BANNED
That's the correct direction to proceed first and make sure you don't have one of those mismade crank gears as stated above
Bruce Lancaster
Member Emeritus
The piston stop is universally applicable, yes, but in the case of Fords with offset cranks some version of splitting (stops or measurement) is necessary to really pin down TDC. Just an indicator can do the job adequately on a straight up engine, but produces a foggy area of about 3 degrees over an offset crank.
Of course here we are looking for the source of a fairly large problem, looking at the location of a hole that could be analyzed with eyeball TDC.
But...another issue here is that the engine sports a timing indicator gadget. Doing TDC accurately would allow this thing to be checked, and I would bet it is pretty shaky there...
Of course here we are looking for the source of a fairly large problem, looking at the location of a hole that could be analyzed with eyeball TDC.
But...another issue here is that the engine sports a timing indicator gadget. Doing TDC accurately would allow this thing to be checked, and I would bet it is pretty shaky there...
Mike V. Florida
Well-known member
Are we sure he is not using that "gauge" to determine it 10 degrees off?
Ignore, remove, the gauge and see if the pin slips in at TDC.
kenparker
Well-known member
OK guys found the hiccup. pix below. The white round dot on the timing gear is inside the round dimple in the timing gear.. The white mark on the tooth of the crank gear marks the tooth that corresponds to the tiny dimple on the crank gear. They are off by one tooth. According to Mike that is 7.3 degrees which is the same ball park as my original guess of difference between timing pin and dial indicaror TDC. Will have to pull cam to fix that.
And, yes, the timing indicator "gadget" is homemade. But when all else is fixed correctly and the mark on the Pulley is put in the correct place it will work purr fek ly.
... and yes there is no rope in the oil pan. This engine is all put together temporily (sp) and checked for accuracy - to be disassemlied and used in an engine assembly workshop next month. Gaskets put in at workshop.
One more thing. It IS an A timing cover - early 28 to be exact.
Thanks for the input. keep u posted on progress. ken
And, yes, the timing indicator "gadget" is homemade. But when all else is fixed correctly and the mark on the Pulley is put in the correct place it will work purr fek ly.
... and yes there is no rope in the oil pan. This engine is all put together temporily (sp) and checked for accuracy - to be disassemlied and used in an engine assembly workshop next month. Gaskets put in at workshop.
One more thing. It IS an A timing cover - early 28 to be exact.
Thanks for the input. keep u posted on progress. ken
Attachments
Dick Steinkamp
Well-known member
It would be easier to just pull the cam GEAR and reposition it.
Mike V. Florida
Well-known member
GREAT!! Easy fix.
H. L. Chauvin
Well-known member
FWIW, Example Of A Local Good Samaritan:
One (1) suggestion & example:
1. First try to find out who performed this improper tooth alignment ...... and ..... if he is a local Dentist, please let all of your local friends know.
2. Even enter your reply #25 tooth alignment photo in your local newspaper.
3. In the long run, your neighbors will all appreciate and love you for this helpful information, thus avoiding having to pay for subsequently fixing a non-aligned tooth smile.
4. Nothing like a happy ending.
One (1) suggestion & example:
1. First try to find out who performed this improper tooth alignment ...... and ..... if he is a local Dentist, please let all of your local friends know.
2. Even enter your reply #25 tooth alignment photo in your local newspaper.
3. In the long run, your neighbors will all appreciate and love you for this helpful information, thus avoiding having to pay for subsequently fixing a non-aligned tooth smile.
4. Nothing like a happy ending.
Last edited:
kenparker
Well-known member
Next step. Timing cover removed. Timing gear removed. Camshaft rotated 7.3 degrees. Timing gear replaced and nut installed and tightened.
Timing front cover replaced and Timing pin checked to see if it lines up with dimple in gear. Prognosis. Timing Pin in dimple and dial Indicator indicate TDC at the same time. Yep.
There is a 1 plus degree overlap when piston is at TDC. Had to find the center of that overlap.
Thanks guys for the help. Need any more pictures while I have that engine apart???? ken
Timing front cover replaced and Timing pin checked to see if it lines up with dimple in gear. Prognosis. Timing Pin in dimple and dial Indicator indicate TDC at the same time. Yep.
There is a 1 plus degree overlap when piston is at TDC. Had to find the center of that overlap.
Thanks guys for the help. Need any more pictures while I have that engine apart???? ken
Attachments
Ron in Quincy
Well-known member
I had the same problem with a new rebuilt engine back in 2010. When I rebuilt the distributor I used a new mfg. "B" cam, do not remember what dealer I got the cam from, finally discovered the cut out in the cam for the rotor had been machined in the wrong position and I was about .010 degrees advanced. When I replaced the cam with a good old "A" cam it was right on using the timing pin.
Ron
Ron
Patrick L.
Well-known member
Glad to hear its an easy fix. Its always nice to start at the beginning with the basics. One never knows what someone else has done. Its frustrating to spend so much time finding this stuff, but, this stuff happens.
Tom Wesenberg
Well-known member
Now is a good time to replace the worn out hand crank ratchet.