I'm sorry for the confusion, it is 0.20mm and 0.30mm for the valves. I
tried the stethoscope and all I here are normal valves closing. Tonight I'm
going to try to remove one rocker at a time and run the engine until I find
out which one is causing the noise.
Ken
DATSTER
-----Original Message-----
From: Gordon Glasgow <glasgow@serv.net>
To: datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
Date: Sunday, March 07, 1999 5:38 PM
Subject: Re: B-camshaft questions
>At 01:19 PM 3/7/99 -0800, ken pletcher wrote:
>>My 69 2000 has a B-cam and 2 lobes are begining to wear. I just bought
new
>>rockers and B-cam and here is the problem. It sounds like one valve is
>>adjusted to loose,I have them all adjusted very snug at 0.20 intake and
>>0.30 exhaust when hot.
>
>Ken, I hope you're talking millimeters! Valve lash should be .008" intake
>and .012" exhaust hot, which is .20mm and .30mm.
>
>On that noise, can you locate which valve it is? If you have an automotive
>stethoscope, that's the easiest way to locate it. If you don't, you can
>fake it with a long socket extension. Put one end against the bone next to
>your ear and the other end against the cam cover (hope your engine doesn't
>rock too much!).
>
>If this noise is occurring with the new cam and rockers installed, you
>should probably check to make sure that the cam lobe isn't running off the
>end of the face on the rocker. Locate the rocker that is suspect, clean it
>thoroughly, put some machinist's dye on it and turn the engine over by
>hand. Then check the pattern in the dye.
>
>>My other cam did not have this problem,one thing I
>>did notice is that the old rocker arms have B marked in each and my new
ones
>>don't. Are there different rockers for the B-cam?
>
>There were differences in rocker arms, but it didn't correlate to the cam
>grind. Early rockers were a one-piece design but it turned out that the
>rubbing face that contacts the cam wasn't hard enough. So a two-piece
>design was introduced that used a harder insert for the cam face. Other
>than that, the two are the same. I have rocker arms with C, E H, I, O and
>nothing, and there appears to be no difference at all between them.
>Gordon Glasgow
>Renton, WA
>http://www.gordon-glasgow.org
>
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