Having a bit of trouble doing the cam timing on the fiesta.

Am I correct in thinking that if the valve is hitting the piston, the car won't turn by hand at all? I.e it will stick?? Or is it possible that it will hit and still turn over by hand?

thanks for any hel.

 

Have you taken the spark plugs out?

 

Yes, just hear a slight sqeeking noise when turning it over but that could be rings or anything I guess as it's brand new engine...

 

Is it on verniers or anything like that?

 

No, they are keyless pulleys though.

 

Basically - the car is struggling to start, so I'm checking cam timing but don't have the tools. It was timed with bar and pin, but the inlet cam looks like it's slightly out, so I've moved it a little, to see if it helps...

Basically if the valves are hitting I'm wondering if I would still be able to turn the engine over by hand or would it stop dead when it hits the piston.

 

And i've said Basically twice, but it's not really that basic. LOL

 

If it is only slight contact, the engine will still turn by hand, I take it the cams and pulleys are interferance fit and didn't come apart?

 

Yeah it's not come apart - undone cam pulley bolt and turned cam then tightened it back up..

 

How d you read off the timing marks then , is it a case of bolting a block onto the top on the cam to lock it?

 

No timing marks!

Bar across the slots in the cam, and pin to stop the crank when it's timed up.

I think the slots on the cams are out though and they've been ground from two exhaust cams.. Possibly!

 

Wheres the car Dan? I might be able to get someone to come look at it if its slough?

 

Manchester mate.

 

Bugger

Is the Diva far from you?

 

Far enough! I might just turn the fucker over and see what happens.

 

what engine?

redo the cam timing before starting it..

steve

 

Zetec-SE given up on the progress tonight getting the correct timing gear and will give it a go tomorrow.

Cheers for help everyone.

 

puma then?

did you lock it tdc on piston 1, then lock the cams into position on the bar it should be fine.

 

1600 Zetec not puma.

 

Cams are that wild i don't think it can be timed on standard marks.

I'll have a play tomorrow, and don't have the timing gear until tomorrow.

 

double check piston 1 and 4 are at tdc by looking through the spark plug gaps once locked, if so and cams are locked i cant see a problem, did you oil the bores when engine was assembled?

 

Oh yes.


It's the cam timing Ill have a proper play tomorrow.

 

good luck then mate, have you had the head skimmed? maybe too much?

 

Hope you sort it mate

 

Heads not skimmed and pistons have huge cut outs.

 

Dan, these are the lairy cams right? Did you not get proper peak lift timing figures? You'll dramatically affect the powerband "guessing" where they go mate. Ring me on my mobile now if you want pal

 

If ground from 2 exh cams the timing bar will be 100% wrong. Think about it the in cam slot facing left and exh facing right when timed to tdc left and right slot will be facing each other so the bar will fit, if both cams ground from exh cams then one will be 180 degrees out hence valve to piston contact.

 

There wasn't valve to piston contact originally - and it wasn;t starting or revving.

Now there is a slight tap and it starts and revs a little, so I'm glad it's confirmed it's the cam timing. Will time it up propper now - clock is counting down - gotta be in london by 6pm!