Huw
Club Member
Hi all
I have been rebuilding my cylinder head and have run into some problems, which I could really do with some guidance on resolving.
So far I have had the head skimmed, inserts put in the valve guides and had the valves re-seated. I have also renewed the springs, rocker arms; lash pads and the cam. All these items are stock items.
On checking the lash pattern I found the wipe pattern to be way off the lash pad centre. With the wipe pattern biased toward the rocker pivots (See diagram). Did not expect that. It was like this for each of the valves, so I can determine the machinist did his job and equalised all the valve heights.
So playing about with cut up feeler gauges, I found I could improve the wipe pattern by packing up the stock lash pad height by 0.020”, increasing the lash pad size to 0.140”. So far so good, I can get hold of these.
BUT by raising the lash pad height on some of the rockers, I was unable to set the correct lash gap. There was no adjustment possible due to the rocker being flush with the cam and the pivot wound as far down as it would go. Its like the cam towers have shrunk.
Can anyone shed some light on what the possible contributors to this problem could be and how I could go about checking them and putting this right?
All suggestions gratefully received as I’m at my wits end with this damn thing.
Thanks
Huw
I have been rebuilding my cylinder head and have run into some problems, which I could really do with some guidance on resolving.
So far I have had the head skimmed, inserts put in the valve guides and had the valves re-seated. I have also renewed the springs, rocker arms; lash pads and the cam. All these items are stock items.
On checking the lash pattern I found the wipe pattern to be way off the lash pad centre. With the wipe pattern biased toward the rocker pivots (See diagram). Did not expect that. It was like this for each of the valves, so I can determine the machinist did his job and equalised all the valve heights.
So playing about with cut up feeler gauges, I found I could improve the wipe pattern by packing up the stock lash pad height by 0.020”, increasing the lash pad size to 0.140”. So far so good, I can get hold of these.
BUT by raising the lash pad height on some of the rockers, I was unable to set the correct lash gap. There was no adjustment possible due to the rocker being flush with the cam and the pivot wound as far down as it would go. Its like the cam towers have shrunk.
Can anyone shed some light on what the possible contributors to this problem could be and how I could go about checking them and putting this right?
All suggestions gratefully received as I’m at my wits end with this damn thing.
Thanks
Huw
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