Urgent Help Needed Regarding Cas And Timing

[Chris32R]

I was working on my R32 GTR and thought it would be a good idea to leave the cam cover off. Well I started it and all was fine until I noticed that the bolts on the cam gear were interfering with the Cas. I immediately shut the engine off and removed the Cas to find it very hard to turn and noticed the half circle from the cam had snapped off. Anyways I bought a new Cas and aligned the cas to the cam 100% correctly and now the exhaust pops but won't start at all. I'm assuming the timing is out but have no idea how this could happen. What do I do to get my car running again? Please help if you have an idea.

Thanks

[Chris32R]

Oh and I've tried using the old Cas that I suspected was damaged but still same result

[AngryRB]

same happened with my setup, i snapped the cam gear thing off, you just need to get the cams aligning with the marks, should be able to look in there with a torch and simply slide the cam angle sensor in where it would of match up and you'll be fine, the cas might need turnt one way more than before, so try again,

you must of just put it in on the wrong angle which has made the timing wrong.

make sure you space it right with the old seal from the cover.

Edited June 13, 2012 by SliverS2

[Chris32R]

Thanks for the help mate.

I've tried putting the cas on about 10 times everytime ensuring that it was going in right and still nothing. Even with the new Cas I bought, the cam has still got just enough of a lip on it so that the Cas only goes in one way.

I might try put the cover back on instead of using washers to space it and see if that does anything. If that doesn't help then I'm clueless.

[Chris32R]

Ok disregard my last comment. Just had another play around with it and it seems like it's going in more than one way. I'll have another play around with it and see if I can get it right.

Thanks

[SiR_RB]

i first did this with my old gtr when i left the cover off, you need to put washers between the CAS and CAS bracket otherwise it makes contact with the bolts that hold the cam gears on and will grind the shit out of the CAS

[blind_elk]

As well as the half circle in the cam, there is a set of teeth on the cam and the CAS that mesh together when the CAS is installed. So you can set it up about 10 different ways if the half circle is missing.

There is only one mounting position for the CAS that will allow the engine to start.

[Chris32R]

Thanks for the help guys. Doing a bit of research it seems that a lot of people have made the same mistake as me by not spacing the Cas out from the cam. I'll try different Cas positions tomorrow and hopefully I can get it started.

[89CAL]

Did you set the timing after you put the CAS on?

Remember that once it is on it can still rotate left or right to adjust timing (like a distributor on an older car)

You really need to get a timing light and check the timing once the CAS is on. 15 degrees (middle mark on the harmonic balancer)

[AngryRB]

it really is tricky and be careful or you might end up breaking the cas like i did,

double check the bracket itself is on properly with the two dowels lined up and going into the holes on the bracket, tighten every bolt gradually and equally, use the mark on the cas to line it up,

you only need to use that black seal with the washers in it already, the one from the cover, and you should be right.

Edited June 14, 2012 by SliverS2

[Chris32R]

Well I tried to get it started today and have had no luck whatsoever. I'm not sure if the motor is full of fuel now or the spark plugs are too wet to fire but it just doesn't want to start. Really confused on what to do right now.

[AngryRB]

you might have the half moon 180degrees out, can you seen inside the cam gear part so that your lining it up properly,

Does the cas feel like it hits home , if its quite loose feeling it might be broken inside,

plugs will be getting wet too, but it should still start , try not to be cranking it for too long, it should turn over fast if its in the right spot.

[Chris32R]

Yeah there's a shiny half on the end of the cam that I'm obviously assuming is where it has snapped off. I've lined it up a million times now but still nothing. I'm starting to think I've bought a dodgy Cas sensor.

[AngryRB]

is it hitting home though? where did you get the sensor? look on kudosmotorsport site and compare the ID to confirm.

[Chris32R]

Yeah it slots in nicely and I've checked to make sure it's spinning when it's being turned over. You can also hear the injectors ticking when its cranking which would suggest that it is working. I bought it second hand off someone who had a spare for his GTR. I'm tempted to get someone to have a look at it as it's starting to do my head in as to what could be causing it not to start. Maybe there's a bigger problem but it's confusing because it was working beforethe tooth snapped off from the cam when I ran it with no cover.

[Moodles2]

If it's a R34 CAS, even though it bolts straight on, 2 wires are switched (will need to be switched over if it is indeed an R34 one)

[KiwiRS4T]

CAS types sorry photos didn't copy but you can tell early one becasue of metal case and Mitsubishi logo later one by plastic case (Hitachi).

This is an R33 one (Mitsubishi) 23731 02U11 metal case

This is an R34 CAS -(Hitachi) 23731 5L 300 plastic case

I don't think the wrong one would engage properly with the drive on the end of the cam so if it fits ok you could just try reversing the wiring.

R34 CAS

pin 1 = earth

pin 2 = power

pin 3 = 1 deg

pin 4 = 120 deg

R33 Cas

pin 1 = 120

pin 2 = 1

pin 3 = power

pin 4 = earth

And making it easier basically showing that:

1 swaps with 4

2 swaps with 3

3 swaps with 2

4 swaps with 1