Author Topic: camshaft caps  (Read 358 times)

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Offline oly507

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camshaft caps
« on: July 28, 2018, 02:31:21 PM »
What do the numbers on the top of the camshaft caps stand for?  I have a NOS '76 head.  Two of the three camshaft journals are the same size  with the journal nearest the camchain showing just a little more wear.  I bought a bunch of new caps, to go with the new head, off Ebay and that's when I noticed the numbers on the caps.  Any help would be appreciated.

Rich

Offline guylr

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Re: camshaft caps
« Reply #1 on: July 28, 2018, 06:15:03 PM »
You know, I never paid much attention to those and just made sure I replaced the caps in their original position. Being that the numbers are cast in I'm not sure how they would size them after machining. In practice most Yamaha bearing caps are very close to each other so I'd just install them at random with the cams, torque to spec and see if the cams spin freely. If they bind swap the the caps around until they free up. You can also check the oil clearance with Plastigauge (available at better auto parts stores like NAPA) to see if you are in spec. Shoot for something in the 0.020 to 0.050mm range.

Guy

Now Retired Yamaha guy. Cut me and I bleed "Cinquasia Red"

Offline oly507

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Re: camshaft caps
« Reply #2 on: July 29, 2018, 01:53:20 PM »
Thank you, Rich