Timing Issue

[Lightning_0809]

I got 420a with Crower 2s aem tru time cam gears and mechanical tensioner. the aem gears have 2 notches in them where the dowl pins can go which notch should be used. Also what posistion should the dowl pins be when setting the timing, or is it the same as settin the timing with the origional gears.

 

[VelocitàPaola]

I got 420a with Crower 2s aem tru time cam gears and mechanical tensioner. the aem gears have 2 notches in them where the dowl pins can go which notch should be used. Also what posistion should the dowl pins be when setting the timing, or is it the same as settin the timing with the origional gears.

The orientation of the dowels relative to the camshafts doesn't change just by using different gears. The dowel on the intake camshaft faces down, and the dowel on the exhaust camshaft faces up.

http://www.dsmtuners.com/forums/420a-bolt-tech/208230-420a-timing-confirmation.html

 

[Lightning_0809]

So you dont go by the timing marks on the aftermarket cam gears cause the are nowhere close to lining up

 

[glowryder]

NO, go by the dowel holes. get the correct tool. Bitts and DCR sell them. it makes timing take about 2 min, and is extremely precise.. basically at TDC tour dowel holes will be locked straight up (thats what the tool does.

Aftermarket gears are pretty universal, youll have to make new marks.
Im glad to see your using the mech tensioner, just curious how you got that far in your research, yet cant time the motor..

how DCR times: (I Use this method, works great)
get the tool, install tool.
wrap belt around all sprockets and gears
loosen all bolts on the adj gears
apply tq to tensioner until spring is in tang,
(you will see your cam gears turn as they are taking up the slack, but your cams will remain stationary, thus the timing marks are needing to be re-done)
Lock down Tensioner bolt to correct TQ.
Then lock cam gears adj bolts to correct spec. make new marks.
rotate 2-3 times, and verify timing.

Theres also a good video showing this, and DCR has a good write up as well. called the "dcr timing method" google it as i dont think its on here.

 

[Lightning_0809]

So both dowl pins should face up or intake down and exhauset up. I lost my paperwork on setting up the mechanical tensioner so now i gotta ask for help.

 

[glowryder]

Both should be UP at TDC.

Theres an arrow on the the tensioner, it tells you what way to rotate it. When tension is correct, that spring end will be between the goal posts.

You need to make SURE the cams are set correct, other wise you could bend a valve, or be off on your timing, and if your off, it will be very hard to start if at all, thus why i recommend the tool.

Google search and you tube have plenty of vids of how it works.

 

[VelocitàPaola]

Both should be UP at TDC.

Are you talking about the holes in the camshafts under the valve cover? The dowels on the end of the camshafts that index the gears should face in opposite directions at TDC.

 

[glowryder]

Holes in the cam shaft them selves. Thats what the tool is made for. they are Dowel Holes.

 

[Lightning_0809]

Im confused now im talking about the pis the hold the timing gears in place how should the be facing.

 

[glowryder]

Dont go by those. ALIGHN THE CAMS SO THE HOLES FACE UP (Perpendicular to head /valve cover interface). you don't need to worry bout where those pins are IF the HOLES ARE FACING UP. If you time by those pins, you'll be almost guaranteed to be off on timing. Those Holes are your only true way of timing since you have aftermarket cam gears.

 

[Lightning_0809]

0K I understand thank you for clarifying that.

 

[glowryder]

Lol, No prob. GL with the timing, Make sure once you "think" you have it right, that you check it a couple times. But using the method above is almost 100% fool proof.

 

[Lightning_0809]

Right on thanks brotha.

 

[bullettdsm]

Just for clarification for future posters; on stock cams the intake dowel pin (the pin on the end of the cam that the cam gear goes to) should be facing down, or at 6:00 position. For the exhaust dowel pin, it should be facing up (or at the 12:00 position).

The "dowel holes" (or the holes in the cams that are drilled into the cams themselves located after the first two cam lobes) should be facing up, when the cams are set for TDC.

Just kinda got confusing there, .

MB

 

[Lightning_0809]

BULLETT your the man.i was stilla lil confused till you posted that. Thank you sir.