93LS1RX7

iTrader: (8)

I just got done my TREX install and found a little trick people may want to try that I didnt see in the install notes (Which were AWESOME!!!).

Here is the trick to help lining up "DOT TO DOT"

Once you remove the timing cover, prior to taking off the cam gear, remove the spark plugs so the engine is easier to turn over by hand then line the dots up so you make sure it is lined up 100% before you take the gear off. Plus you get to see what lined up really looks like. Very nice to have them lined up 100% then take the cam gear off, pull the cam, put the new one back and the crank gear is already straight up and you are positive of that.

Again just an idea that made the dot to dot issue not even a worry, hell I had no PtoV problems doing it that way with the TREX and it took my 2 minutes to get the dots lined up because the crank gear was already correct.

Mike

Predator

That's an even better method than mine: I just took off the cam gear and chain, then turned the crank until the crank gear dot was straight up, installed the cam gear and chain, and then rotated the crank 360* to make sure the dots lined up, but it's a lot more work than your thinking ahead method.

hourang

iTrader: (6)

i did this on my cam install, worked great

1fastWS6

iTrader: (3)

I think it's common knowledge to do that before removing a cam. If you don't, then you have a chance of installing the cam 180* off since the dot on the crank gear will be on top twice (once for #1 TDC compression stroke, once for #1 TDC exhaust stroke).

You're right though, if its not in the install guide it SHOULD be. A lot of people use that.

93LS1RX7

iTrader: (8)

The install guide say to rotate the crank after you have removed the old cam and gear and already reinstalled the new cam. The 180° out is the second reason why I suggested it after just seeing the dots lined up.

Predator

This has me worried, are you saying I could be 180* off? If so, how would I know? Does it matter that I was able to crank the engine around so the cam and crank dots lined up (meaning that maybe that wouldn't be possible if I was 180* off)?

Predator

Let me clarify, if I need to, since I just removed the cam gear and chain, then the cam, put the new cam in, and then just rotated the crank gear until it was straight up, and then aligned the cam gear dot with that, I could be 180* off? Is there a way to check. My car is still apart, so I need to correct that now before moving onto the springs.

Thanks.

2xLS1

iTrader: (25)

The cam determins if the crank is at the top of compression or top of exhaust. As long as the crank dot is up and the cam dot is down, it will be phased correct. Doesn't matter how many times you spin the crank.

93LS1RX7

iTrader: (8)

True. The piston is at the top of its stroke it could care less if it is exhaust or compression stroke.

Predator

Excellent 2xLS1!

So I'm all set since my dots are lined-up even though the dots weren't lined up when I removed the cam gear and chain?

Just want to double check.

Thanks.

Predator

93LS1RX7, you nearly gave me a heart attack with that 180* theory.

93LS1RX7

iTrader: (8)

DONT BLAME ME!!! hahaha

it was 1fastWS^ that said "I think it's common knowledge to do that before removing a cam. If you don't, then you have a chance of installing the cam 180* off since the dot on the crank gear will be on top twice (once for #1 TDC compression stroke, once for #1 TDC exhaust stroke)." I just said that was another reason why I did it so I wouldnt have to consider any other possible problems.

Predator

You're right, my mistake. Sorry.

Damn you 1fastWS6!!!!

Predator

Wait a minute, 93LS1RX7, you're not completely innocent here, mister.

P Mack

iTrader: (6)

Yep. It would matter on a distributor driven car, but with the cam position sensors the pcm knows what stroke it's on. Even if the cam position sensor gets messed up, the pcm is smart enough to use the crank position sensor and guess which stroke it's on for the fuel and spark and remember if it's right or not.