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Old 10-08-2007, 12:31   #1 (permalink)
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460 timing gears

Hey Guys,

Continuing to assemble the 460 in my spare time. I installed the timing gears yesterday but have a question. According to my 460 manual (and what I've always experienced on FE engines), the crank keyway should be pointing directly upward and the cam marker dot should be pointing directly downward when installed. On the new timing set I got with the disassebled engine I bought, the keyway on the crank is slightly turned clockwise when the marks on the two gears line up. There are 3 keyways on the crank gear. One is 4 degrees advanced, another is 4 degrees retarded, and the third being 0, which is the one I am using. Anyway, there is a mark on the keyway on the crank gear and another mark at the tooth. There is about 1/2 tooth difference in rotation between the two. Instructions with the timing set say to use the mark at the gear and not the one at the keyway, so that's what I did. Because of the minor difference between the two marks it would be impossible to line up the cam gear (1 tooth way too much) with the keyway mark anyway but it makes me nervous that my tech book says the key on the crank should be pointed straight up when in line with the cam gear. I think I'm okay but want to come to the guys that know better than me.

Also, my cam is a Lunati LUN-00096 (per summit) with a BM-II grind (gave wrong cam before). Is the 0 degree setting what I want?

Thank you very much guys.

Ron
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Old 10-10-2007, 12:18   #2 (permalink)
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cool Re: 460 timing gears

In 1972, Ford retared the camshaft timing by way of advancing the crankshaft...as you are noticing with your timing chain marks. Good observation by you!

The confusion that a lot of people don't realize is that some aftermarket double rollers timing chains are available as a 72-up chain & gear set (Cloyes, for example, offer's a pre-72 & post 72 double roller chain). This would mean that where the round marker is 0* on the pre-72 version is actually 4* retard on the post-72 motors & post '72 style aftermarket chains. Therefore, since your "0" setting on your current triming chain is advancing the crankshaft, it's obvious that you have a performance double roller chain that was created to 1972-up chain specs.

In your case, the way to correct your crank/cam position back to "straight up" specification is to simply install at the triangle (pointed keyway) in order to advance the cam back to 0* with the post '72 timing chain set. In other words, try a different keyway on the crank gear that will reposition the cam and crank keyways back into perfect alignment.

Alternately stated: Whichever timing set you have, the mark directly above the keyway is the true 0* (pre-72) cam timing setting (unlike the other two marks on the gear which are slightly offset from their respective keyways) regardless of which chain set you have (pre or post 1972).

So select the keyway that has the icon directly above the keyway (not slightly offset to one side of the keyway or the other). Also, the peak of the tooth on the crank gear will also be in direct alignment with the keyway and the keyway marking that is directly above the keyway. THIS IS PRE-1972 STRAIGHT UP. To verify after installation, both cam and crank keys should be at preciesly 12 o'clock when #1 piston is set to TDC.

Confusing, huh?

Paul
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Old 10-10-2007, 12:45   #3 (permalink)
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Re: 460 timing gears

Thank you very much Paul. I know it just didn't feel right the way is was and your explanation makes sense. I've never done anything except a stock build before so I thought maybe it was a performance issue with the cam but my gut told me it wasn't right. I'll reset the gears per your instructions. Thanks again.

Ron
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