when timing gear marks aligned does # 1 cylinder need to be building compression or is that just to put #1 at tdc
my 350 marks are aligned on timing gears but compression builds at anothewr180 degrees help
2007-03-14 10:33:42 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Chevrolet
I own a shop, and build a lot of engines. You can be at top dead center either on the compression stroke, or the exhaust stroke, so you need to be on the compression stroke. You can do this by spinning the engine with your finger over the #1 spark plug hole, and when it blows your finger off you are on the right stroke. If you don't have a way to spin the engine such as, it its not in the vehicle, remove the valve cover on the drivers side to see the #1 rockers. Turn the engine until you have the piston up, and both valves closed, as in the rockers are relaxed on both intake & exhaust. This is where your marks on the gears should align with each other.
Part 2:
Think about it, the cam gear is twice a big as the crank gear. Meaning the crank gear turn two revolutions per every one turn the cam gear makes, thus 2:1 ratio. 180 degrees out of time means; you have the distributor in place when the cam gear is straight up or 180 degrees from actual firing position, also called exhaust stroke. With this you have on the gears; the crank gear at 12:00 O-clock by the timing mark, and the cam gear at 12:00 O-clock by the timing mark. When its at the correct position you will have the crank gear mark at 12:00 O-clock, and the cam gear at 6:00 O-clock. The two timing marks will be aligned with each other, and your rotor button in the distributor will be pointed at the #1 plug wire hole in the distributor cap. The only place it will time correctly is this position. Depending on the degrees of your timing, the rotor may be pointed a few degrees before the plug wire hole when its in the correct notch on the distributor, but you should be able to turn the distributor and sweep the #1 spot by several degrees on either side of the #1 spot in the cap.
I don't know how I got so many votes for bad answer, but you must trust me on this one. I really do build engines, and have built probably 7-8 hundred small block Chevy's in my life.
Glad to help out, good luck!!!
2007-03-14 10:50:43 · answer #1 · answered by Anonymous · 2⤊ 3⤋
# 1 cylinder need to be on the compression stroke or you will be 180 degrees off, when you have #1 on the compression stoke set you dist. to point to #1 you know you have it right by looking at the pickup coil and just when the points on the pick-up coil start to pass each other. hth
2007-03-15 21:39:33 · answer #2 · answered by franklinbud8 3 · 0⤊ 1⤋
sounds like you are 180 out.Cam gear should be at 12 o'clock,crank at 12 also,i think.if you put the cam gear at 6 & the crank at 12 you will be 180 out.Have fun with that
2007-03-14 21:45:58 · answer #3 · answered by giff01 3 · 0⤊ 2⤋
when the marks are together cyl. #6 is at top dead center. when they are 180 it is cyl 1 tdc. (crank mark is straight up on top, and cam gear mark is straight up on top)
2007-03-14 19:21:09 · answer #4 · answered by mike m 2 · 0⤊ 2⤋
The cyl is in TDC position. You have a 50/50 chance of being on the compresion stroke.
2007-03-14 17:50:25 · answer #5 · answered by mad_mav70 6 · 0⤊ 4⤋
turn your distributor 180. it'll start right up.
2007-03-14 17:51:54 · answer #6 · answered by jeffrey m 4 · 0⤊ 4⤋