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Old 11-27-2014, 03:44 PM   #1
woodly1069 OP
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Airhead engine question

Ok so I am in the process of refreshing the top end of my 1978 R80/7...pushrod seals and lack of base gaskets caused all kinds of oil on my boots :

So here is the deal, while starting reassembly I decided to check the tappets and that's when I noticed that they didn't ride the cam fully. In other words the lifter was only partially on the cam; kinda shifted horizontally. I can't seem to understand how this could be because the lifters are located in a bore in the casting that feels fine. All four are off...it almost seems that the cam has shifted and that would make the lifters appear "off". Everything still functions fine and the cam and lifters look perfect but I just don't get it. Any thoughts or advice here? Here's a pic although kinda hard to see...

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Old 11-27-2014, 03:51 PM   #2
chollo9
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They're offset so they will rotate and wear evenly. If they were centered, a groove would eventually wear down the middle of the tappet.
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Old 11-27-2014, 03:58 PM   #3
woodly1069 OP
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Wow! Thanks for the quick reply, I thought something was seriously amiss
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Old 11-28-2014, 04:34 PM   #4
Bill Harris
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And if you look closely at a used camshaft, the tappet contact pattern will be assymetrical and squiggly. Also normal for the same reason.

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Old 11-28-2014, 06:29 PM   #5
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Still learning new stuff about these old bikes every day
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