cracked cyl head

[30 Closed Cab PU]

Looks really clean. If the coolant passages are cruddy, now would be the time for a block treatment or 2.


Tappet gap check adjustment?

[katy]

Any idea why the head cracked? Possible freeze crack? I would check the underside of the water jacket on the block, LH side for possible crack(s).

[Purdy Swoft]

It doesn't look like a freeze crack .

[katy]

Originally Posted by Purdy Swoft

It doesn't look like a freeze crack .

I agree, although it still wouldn't hurt to check the water jacket underside.

[Purdy Swoft]

I would also check the water jacket on the deck of the block .

The crack could have been caused from overheating . I would also look at timing and points gap as a possible cause . Points gap can effect timing . Too little gap hurts performance as it retards timing . Retarded timing at the rotor tip or over use of the spark causes a lot of overheating that often gets blamed on other possibilities .

[thom]

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I bought the parts I needed this past weekend to convert my distributor back to stock Model A points and condenser. I intend to do that before I run it again. I don't like the conversion that was in it that uses late model Ford V8 parts. I also bought a single bulb socket, 6 volt bulb, and some alligator clips to make a timing light so I can check the timing and correct it if needed. I will change the oil before I crank the car too. I will never again drive off in the car without checking the water/coolant level in the radiator, even if I have checked it the day before.

[40 Deluxe]

Originally Posted by Purdy Swoft

I would also check the water jacket on the deck of the block .

The crack could have been caused from overheating . I would also look at timing and points gap as a possible cause . Points gap can effect timing . Too little gap hurts performance as it retards timing . Retarded timing at the rotor tip or over use of the spark causes a lot of overheating that often gets blamed on other possibilities .

"Points gap can affect timing." Maybe a little. In reality, timing is set by that there lever on the left side of the steering column, not points gap! "Too little gap" can be compensated for by pulling the timing lever down an extra click or two. Presto! Timing is correct again! And, if you set initial (or base) timing by factory procedure and keep the point gap correct, it will not change until the timing or distributor gears wear out.

[Purdy Swoft]

Spark occurs as the points open . Wear on the lifting block on the points causes the point gap to decrease . Too little gap causes the points to open later and slightly retards timing . I always set the points where I want them before proceeding to adjust the initial timing . For best results I set mine by the trailing edge of the rotor tip when the timing pin drops in place with NO clockwise backlash . Model A timing is probably the easiest to set of any other automobile . The two things that people have the most problem with is timing and brakes .

[40 Deluxe]

Originally Posted by Purdy Swoft

Spark occurs as the points open . Wear on the lifting block on the points causes the point gap to decrease . Too little gap causes the points to open later and slightly retards timing . I always set the points where I want them before proceeding to adjust the initial timing . For best results I set mine by the trailing edge of the rotor tip when the timing pin drops in place with NO clockwise backlash . Model A timing is probably the easiest to set of any other automobile . The two things that people have the most problem with is timing and brakes .

Since spark occurs when the points just start to open, this is where the distributor cam should be set with the timing pin in place. The position of the rotor tip does not have a direct effect on actual timing. It ends up in the correct spot when the cam is set to just start opening the points.
Besides, as soon as the engine starts, you pull the timing lever down to wherever you like, and that initial setting disappears!

[katy]

Model A timing is probably the easiest to set of any other automobile

The Model T is pretty easy using the timer gauge, P/N T-3170
https://www.snydersantiqueauto.com/P...tributor-timer