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Why were some cylinders180 degrees out when you turned crank when they should only be 90 degrees to check TDC following firing order in a 97 chev 4.3l v6?
Wiki User
∙ 12y ago
I am not 100% sure what you are asking but try this. If I remember correctly the firing order of a 4.3L is 1-6-5-4-3-2. Stack the firing order numbers like this.
1-6-5
4-3-2
1 & 4, 6 & 3, 5 & 2, are companion cylinders. If #1 is on TDC compression, #4 will be on TDC exhaust, #6 will be 120 degrees out from 1 coming up on compression, #3 will be 120 degrees out from 1 coming up on exhaust, #5 240 degrees out from 1 going down on intake, and #2 will be 240 degrees out from 1 going down on power.
If the firing order is different (I think this was firing order pre Vortech heads) you can still apply the same technique to figure out where each piston should be in relation to each other. I hope this helps.
Secondly, on a V6 four stroke you will never have a piston 180 degrees out from another at crank time. Cam time the companion cylinder will be 180 degrees out but the pistons are at the same deck height to each other. The most a piston will be out from another piston (at crank time) will be 120 degrees either coming up or going down. A V8 four stroke can have a piston (at crank time) 180 degrees out.
Wiki User
∙ 12y ago
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