1957 272 y-block
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1957 272 y-block
Timing question: Tried timing and found that distributor will not turn far enough clockwise ( hits the intake manifold) to bring the timing marks to the timing pointer. I can see them at the top of the damper with the timing light on. So, do I need to lift out the distributor and turn counterclockwise a couple of teeth?( so I can bring the marks down to the pointer?) Motor runs good, I just want to be able to actually set the timing on the marks. Also Vacuum advance line OFF during timing?
Thanks everyone.
Thanks everyone.
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From: tujunga, calif
Yes, disconnect the vacuum line when checking the timing. But why is the dizzy off that far? Did you or someone else install it that way? Or maybe your outer part of the balancer has been slipping? You should check #1 cylinder at TDC and see where the timing mark lines up.
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Thanks for the reply. Didn't consider the outer ring on the balancer slipping, I have only recently purchased the truck and don't know if someone has installed the distributor incorrectly. #1 TDC points to firewall in the 10 o'clock position(if looking over the motor from the front). Can the distributor be lifted out and moved counterclockwise a couple of teeth? I think this would solve the problem and allow the timing marks to line up with the pointer for fine tune adjustment. 
Logistics Pro
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From: tujunga, calif
Thanks for the reply. Didn't consider the outer ring on the balancer slipping, I have only recently purchased the truck and don't know if someone has installed the distributor incorrectly. #1 TDC points to firewall in the 10 o'clock position(if looking over the motor from the front). Can the distributor be lifted out and moved counterclockwise a couple of teeth? I think this would solve the problem and allow the timing marks to line up with the pointer for fine tune adjustment.
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How do we verify timing mark position? It's attached to the front of the block and looks like it could only go on one way (11 o'clock position or passanger side of balancer), and I also wonder how do you check for balancer slip? Thanks again so much for your help.
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From: tujunga, calif
I'm sure the timing pointer is fine, it's the mark on the dampener you want to check as they can slip. Remove your #1 spark plug ( front passenger side ) then you will need something to stick in the plug hole so you can feel the piston come up to top dead center, I usually use some thing soft like a soda straw, everyone uses something different. You will have to turn the engine over by hand at the same time or if possible have some one help do that, until you feel the piston at the top. At that point the timing mark should line up with the pointer.
Fleet Mechanic
Joined: Apr 2012
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To add to the above information, when you have tdc, you may be half off, pull the dist cap and verify that the rotor is pointing at the #1 plug wire. If its not even close, turn the engine one more turn.
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Cargo Master
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Make sure that the vacuum lines are all connected correctly, you don't have a vacuum leak and it isn't doing something like opening the EGR valve at idle.
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Logistics Pro
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From: tujunga, calif
9 year old post? EGR on a 57 272, I don't think so LOL
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From: Near Salt Lake City
it is pretty easy to check TDC with a long bolt with spark plug thread
Screw the bolt in a long way.
Doesn't matter how far as long as it hits the piston when you bring it up
Rotate the crank clockwise slowly until the piston hits the bolt
Make a mark on the crank with a crayon or tire chalk
Rotate the crank the other way (CCW) until the piston hits the bolt again
Make another mark
The middle of the 2 marks you made is actual TDC (compare that to the damper marks to see if the inertia ring has shifted)
Your Y block spark plug threads should be M18 x 1/5 The smaller plugs are M14 x 1.25
Good luck
After you move the distributor to where you need, it it may not drop all the way down all the way, and will not be engaging the oil pump drive
Simply push down on the distributor and turn the crank clockwise
The distributor will then drop down once the pump shaft lines up
Screw the bolt in a long way.
Doesn't matter how far as long as it hits the piston when you bring it up
Rotate the crank clockwise slowly until the piston hits the bolt
Make a mark on the crank with a crayon or tire chalk
Rotate the crank the other way (CCW) until the piston hits the bolt again
Make another mark
The middle of the 2 marks you made is actual TDC (compare that to the damper marks to see if the inertia ring has shifted)
Your Y block spark plug threads should be M18 x 1/5 The smaller plugs are M14 x 1.25
Good luck
After you move the distributor to where you need, it it may not drop all the way down all the way, and will not be engaging the oil pump drive
Simply push down on the distributor and turn the crank clockwise
The distributor will then drop down once the pump shaft lines up
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