Crank seems to be slipping

Hello,
Sorry for the long post, but....

i recently replaced my head gaskets on my TT took a bit longer than anticipated as life got in the way, but got it done none the less, very proud moment when i cranked her over and she started first turn of the key, about a week later, i tryed to turn her over did a about half a crank then made a loud knocking sound and didnt start, so with a 21mm ratchet i manually turned the crank seemd to do about a turn and a half then it would lock, so i turned it the other way and the same again. So i pulled out the spark plugs no liquid in the cylinders *few*. I tryed manually turning the crank again and still only did a turn and a half, i peered into cylinders and gave it some force the crank turned but with a knock sound the cylinders didnt budge, but the cams still turned. Can someone enlighten me to what causes this cheers Raph

 

You put the half moon key back in the crank / timing belt cog, didn't you?
Something's not right (as you know).

 

did you replace the timing belt at all?

 

yeah mate she was running fine for about a week

 

yeah as well as replaced all the gaskets had the heads reconditioned

 

theres a small gap were some of the rubber on the cam covers has come off i could sneek a peek, weres this cam locator pin u speak off hidden?

 

actually i know what u speak off now, that does make sense if ur right i guess its time for new valves damnit, i sure hope ur wrong, i dont feel like pullin my motor apart again

 

cheers mate i shall go rip of my rocker covers and check out this theory immediately

 

Hey Mike

Wouldn't this only be possible on the intake cams/gears - the exhaust have 4 10mm bolts holding the cam gear to the cam.

 

Correct.
But with the pins on the intakes, if the pin and slot on the gear are not lined up, when you tighten it all down, the pin pushes into the cam itself and needs to be drilled and a new pin installed.

 

Hey Mitch, I didn't think that was possible but I guess anything is

 

It's the difference between sitting on the cam, and sitting all the way in. If you are in a hurry and don't pay attention to how the cam lines up relative to the others, its pretty easy mistake to make.
Don't ask me know I know.

 

Had me worried for a moment and made me think when I put the gears back on, though I remeber I only had to push the gear into the cam seal without any force. If one was to get it wrong the timing belt wouldn't line up either.

 

Oh dear i think i found the problem, i hope my timing isnt out and have a head full of bent valves, its also concerning that it only takes half an hour for me to dismantle my engine to this point, :s im doin it far to often these days, it took me nearly a whole weekend to do my first plenum pull

 

lesson learnt keep track of all your all your nuts and bolts

 

That'll do it.