No Compression After Poncam Install

[robbo_rb180]

found out what it was when i removed the cam cover's....... i had the inlet 180 degrees out

i had taken the inlet cam vct stuff apart and not re-aligned it properly.

all fixed now

[PM-R33]

So wait, your intake camshaft was 180 degrees out?

Wouldn't that have bent valves?

[Trozzle]

Maybe he has built engine with non-interference pistons? He didn't say...

[The Dan]

Nope, 180 degrees out will not bend valves.....it's just like working the engine in reverse.

You are very lucky.

Buying decent cam gears is a start...only the cheap shitty ones come with two marks....oh and the HKS ones...but once again, shitty.

[DVS JEZ]

WOW. That is crazy lucky

[robbo_rb180]

Nope, 180 degrees out will not bend valves.....it's just like working the engine in reverse.

You are very lucky.

Buying decent cam gears is a start...only the cheap shitty ones come with two marks....oh and the HKS ones...but once again, shitty.

i still have std cam gears.

i had it so both in & ex would open at the same time.

next time i will read a workshop manual, instead of just jumping into it.

[The Dan]

i still have std cam gears.

i had it so both in & ex would open at the same time.

next time i will read a workshop manual, instead of just jumping into it.

wtf?

That would not be 180 degrees out. That's more like 60 degrees out. You are damn lucky!!!!!

Precisely why ppl should not attempt major repairs at home unless they have someone who knows what they are doing with them. Think about how many dollars you would have saved if the pistons collected the valves

[PM-R33]

So when you pull apart the VCT cam gear you can put it back together incorrectly so it moves the TDC position dot? I've never actually "completely" pulled it apart before.

[Simon-S14]

someone didnt follow the workshop manual very well

the cams have dowels on them. these are to line up to the timing marks on the backing plate when crank is at TDC.

its really as simple as that... yet so many ppl f**k it up

[PM-R33]

My understanding of what happened (and i could be wrong) was that the VCT cam gear was completely pulled apart, then when put back together it was done incorrectly which moved the position of the TDC mark. Then it was put onto the intake camshaft, all TDC were marked up correctly and the belt was put on. So it appeared the belt was on correctly, when looking at the TDC dots, but in fact the VCT cam gear was wrong.

Is that right? Because other than that explanation I don't understand how you can do it incorrectly, the cam gears can only be placed onto the camshaft one way and the dots can only align up one way.

Edited July 17, 2010 by PM-R33

[jiffo]

Yes the stock inlet cam wheel is adjustable, but from the back so it's a bit of a mission.

Sounds like someone was attempting to adjust the inlet wheel and then didn't re-assemble it all correctly.

Then the normal timing marks would all look to be OK, but the wheel would be referenced wrongly to the cam.

Good way to do some damage.

[PM-R33]

Ok cool, that was my understanding of what happened aswell.

[robbo_rb180]

^^ thats pretty much what happened.

learn from ya mistakes.

its all fixed now, just have to wire up the 34 CAS and it should run.

[PM-R33]

Nice