Valve guide question

[Bill Parker]

I'm rejuvenating the top end on a 1983 R65 with 63,000 mi. The valves, pistons, etc. look good, but I want to remove the valves to clean the backsides and lap them and their seats before reassembly. The exhaust valves slide easily out of the guides, but the intakes seem to get very tight (stuck requiring some force to remove) when the keeper notches enter the top of the guides. I haven't forced them yet, but can I press them out or do I need to remove material around the keeper notches (600 grit wet&dry ?) before removing them?

Thanks

Mr. Bill

[Tony Smith]

Ok, that is sure sign that all is not well with those intake valves - genuine BMW valves do not deform the collet area and most decent aftermarket ones don't either.

Fair bet that those valves are no longer rotating properly. For the relatively small cost involved I would junk the valves and replace them with either OEM or good quality replacements. If the guides show any sign of wear you have two choices - replace them which is expensive or have them k-lined which results in a guide wearing surface that lasts on a par with new guides but which can easily be replaced (by a new insert) on a number of occasions.

I'd also get a professional opinion as to whether or not your collets are still OK, they probably will be providing some dumb-ass didn't grind them down to fit not quite correct replacement valves.

[Bill Parker]

Well, replacing valves, guides and springs. Better safe than sorry. Thanks.

Mr bill

[georgesgiralt]

Do not overlook the collets. Buy BMW collets. They are devised to let the valve spin during movement. This makes a difference.

[nhmaf]

Well, it will cost some more, but you should have good peace of mind and confidence in the reliability of the refurbished heads after this!