Y-Block Timing Question

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Mar 25, 2013 | 03:16 PM

F500Mike

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Joined: Mar 2009

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Y-Block Timing Question

I'm a first time rebuilder of the Y-Block (done many others...).

I marked the timing chain, noting 12 pins, and set the cam gear and engine gear to 3 o'clock towards oil filter side and installed the timing set.

My question is, now that the heads and valve train are installed, when I spin the rotating assembly to TDC for number one cylinder (which is on the passenger side front - not the filter side) on the compression stroke, the chain and timing blips on the gears are not as they where when installing them.

Is that correct? Valve train seems to be in sync with pistons and when I put the timing cover and pointer on, along with the crank pulley, the pointer is pointing correctly at the mark on the pulley.

I can rotate the assembly and get the blips to 3 o'clock with the twelve pins between them every several rotations correctly.

Thanks for your help!

Mike

Mar 27, 2013 | 08:26 AM

R Pope

Senior User

Joined: Apr 2006

Posts: 142

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The first turn of the crankshaft puts the cam sprocket mark a half a turn away from lining up, the second turn brings them back to where they started. Just the way it is, any timing set is the same. Just the weird 12 pin bit on a Y is confusing.