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I'M WORKING ON AN N47 HEAD AND WANT TO REPLACE VALVE GUIDES. HAVE THE NEW GUIDES ON ORDER BUT WHILE TRYING TO REMOVE THE OLD ONES HAVING TROUBLE GETTING THE SNAP RING OFF AND I'M NOT SURE WHAT KIND OF A PRESS FIT TO EXPECT ONCE THE SNAP RINGS ARE REMOVED.
IF YOU HAVE EXPERIENCE YOUR THOUGHTS WILL BE HELPFUL.
THANKS, LARRY IN NAPPANEE.
 

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Discussion Starter #2
> I'M WORKING ON AN N47 HEAD AND WANT TO
> REPLACE VALVE GUIDES. HAVE THE NEW GUIDES ON
> ORDER BUT WHILE TRYING TO REMOVE THE OLD
> ONES HAVING TROUBLE GETTING THE SNAP RING
> OFF AND I'M NOT SURE WHAT KIND OF A PRESS
> FIT TO EXPECT ONCE THE SNAP RINGS ARE
> REMOVED.
> IF YOU HAVE EXPERIENCE YOUR THOUGHTS WILL BE
> HELPFUL.
> THANKS, LARRY IN NAPPANEE.
Since posting this message the other day I talked to a guy at my local auto machine shop and got the answer to my question. Thought I would share with our group. The guides are pressed in and are removed by pressing out from the valve opening end. The snap ring is there as a stop when the guide is pressed into place and to keep the the guide from moving to the valve opening if it should loosen.
I'm told that there is the possibility of pulling metal [galling] when the guide is pushed out unless the head is heated some before attempting, The guy suggested using a BBQ grill to heat the head up to about 250 to 300 degrees.
Any comments?
 
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