Cam N Carb

[Guest owenpilson]

ive just ported and rebuilt my 2L pinto , before i pulled it to bits its cam ran nice and quiet. now its back together it sounds like a diesel. i made sure that all the rockers,springs & valves went back in the right order.. could the cam timing be causing this( if its out by one tooth) any ideas.

 

also the carb (32/36)has developed 2 problems , the square diaphram thingy next to the auto choke has got a leak , and the inside of the inlet manifold is dripping with fuel. would the diaphram be causing this problem? and secondly where can i get a diaphram at short notice near Chester as my MOT is on Saturday @ 9am....

 

Cheers

Owen.

 

P.s. Bill if your reading this, the battery looks great in the boot

[Guest V8K]

before i pulled it to bits its cam ran nice and quiet. now its back together it sounds like a diesel.

 

ithink youll find you may need to reset the clearances betwen the cam and valves to cure this not got my haynes to hand but it explains it all very well so shouldnt be a big job

[Guest owenpilson]

ive done that bit now about 3 times (20 inlet 25 exhaust) still stumped......

 

owen.

[Guest V8K]

ive done that bit now about 3 times

 

sorry but i cant think of any other reason it sounds like a diesel then

[Big Jim]

20 inlet 25 exhaust

I hope that you don't mean thou's!!!! if so that's far too much! the manual will tell you 10 and 12 thou, I personally set at 8 and 10 thou.

[Guest Simon cooper]

Hello Owen,

Cam belt out one or even 3 teeth will not cause the clattering.

Firstly, is it definately tappet/cam noise?

You can get a very similar noise if you have a small exhaust blow at the header. Put a piece of pipe in your ear and pass the other end around the gaskets. if there is a blow, you will hear it.

The diaphragm is a different story. Not too sure what carb you have, but if there is fuel dripping in to the top of the carb, it is not due to the diaphragm being knackered. The fuel is probably dripping from the main venturi, in which case the carb settings are miles out and the throttle is too far open, compensating for wrong settings on timing, cam, or mixture.

You need to check more than your tappets Owen, give the whole lot the once over and reset everything again.

Good luck

Simon

[Guest owenpilson]

the carb is a weber 32/36 dgav and the leak is from a diaphram at the back of the carb next to the auto choke ... coming from the square cover with the arm that comes out and goes below the carb . Ill take a piccy of it tommorow and post it...

 

the haynes manual say the clearances are 20 & 25 thou IIRC but i might go with your advice.... but thats a very valid point about the exhaust manifold making a clatter ..... id go out and try it now ... but i like my nieghbors...

 

ill let you know when i resolve it.

 

cheers

Owen.

[Big Jim]

Owen, the manual says 0.20 / 0.25 mm = 8 / 10 thou

[Guest owenpilson]

found a weber dealer just outside Wrexham and got the diaphram for 4 quid ... ill fit it tonite and see what happens

Owen.

[Peter Bell]

Owen the diaphragm is the one for the acceleration pump, if you get a leak there it should mean less fuel getting into the manifold. If there is lots of fuel getting in I would check that the float needle valve is shutting off. I think your other problem may just be the tappets as Jim says.

Peter

[Guest owenpilson]

ill adjust them again tommorow and let you know ... thanks again.

Owen

[Guest owenpilson]

got it sorted ... turned out the followers were very worn... raided my old engine and fitted them ... now its running sweet.. now time to get it taxed and ready for a jaunt to stoneleigh....

 

cant wait...

 

thanks for the help.

 

Owen.