abdr500

iTrader: (1)

when the cam is off lift the valve is open ever so slightly only on a few and just to add thers no bent valves..
has any one seen a hydraulics lifter hold open a valve on a cossy head I went to see for my self head was rebuilt with new valve guides and seals and skim and new double valve spring and new hydraulics in but 2 valve are get held open a bit and if you take the cams out they close its using bd16 s I can only put it down to the lifters as the valves are std size and were the old ones before

Mr RS500

iTrader: (6)

If the tappet has stuck mate then yes it will hold the valve open a little

I have had this before , the center of the tappet had jammed , and this is what pushes on the valve , and so wont shut and let the valve seat back in the head

Doug

Not heared of this before on a YB but someone may be able to answere your question for you

If its been skimmed etc has the machinist sunk the valve seats ? thus causing the valve's to protude further on the cam side ?

Just a stab in the dark mate



Regards Doug .

Damo V

If its only two, try swoping them about se if they do it in other places

abdr500

iTrader: (1)

Damo V
well i went round and i took the cams out and refitted the cams and spun the cams round a good few times and they all shut ..now i have taken the cams out and soked the lifters in oil for 20 mins and re fitted every thing and a few is valves are open its ok if you keep spining the cam and the lifer drains its oil out then they all shut

abdr500

iTrader: (1)

Doug
thats what i siad but i brought down 2 new valves with me and fitted them only to find they do the same thing i did also swap round the lifters and valve springs and retainers still same

abdr500

iTrader: (1)

NORTH YORKS RS SPARES
thank you but its not that i was able to take lifters out and put them in with easy