Re: rocker play

[Kurt McDowell <gmcd@domain.elided>]

John,
    Thanks so much so measuring your parts for me. I was almost ready to spend alot
of time on junkyard searching to find out whats going on. Im glad out meaurements
are
the same and there's nothing wrong with my rockers. One guy at a light line place
was about to send me "good used" boat style rockers for 95$. At the last minute, I
got
a funny felling the guy didnt know what he was talking about so i told him i'd call
back latter
to order.
     For future refrence: whenever you guys are re- doing valves dont wory
about it if your boat-stye rockers/rods dont match the book's specs(for older stlye
valves)
. They will appear verry lose on the shaft.



John A. Landry wrote:

> When the truth serum kicked in, Kurt McDowell <gmcd@domain.elided> blurted
> out...
>
> >My rockers are definatly the "boat style" stamped rockers.
> >After what you said, I'm thinking my book is probably the wrong
> >book for my engine. I know that the rod lenth specs are wrong.
> >but the  parts place says they were right. I bet that my book is
> >for the old style rockers and rods combo, and my engine is newer.
>
> OK Kurt,
>
> I have both styles of rocker arm assemblies handy and here's how they measure
> out...
>
> The old style folded metal measure approx. .870" ID.  I simply took a quick
> measurement of one only with a dial caliper, so this isn't exact, and the ID
> of the bushing is certainly out of round as this is from a high mileage
> engine.
>
> The rocker arm rod for the above measured .863" OD.
>
> The pushrods for the above measured 9-9/16" OAL.
>
> The boat style rocker arms measure about .895" depending on where you measure
> the hole, as it isn't perfectly round.  This coincides closely with what you
> measured.
>
> The rocker arm rod for the above measured .864" OD.
>
> The pushrods for the above measured 9-3/4" OAL.
>
> I suspect the IH shop manual simply documented the folded metal style rocker
> system and was not updated when the change was made to the boat style rocker
> system.
>
> >I found a number embossed into the valley of my block I  think it is: 151023 HS
> >( im very unsure about the letters and the last digit).
>
> That part number is actually 151023-R5.  It indicates a block used for the 345
> and 345A engines.
>
> >My I.D. is .897  My OD is .862 wich makes
> >for a .032 tolarance wich scares me because the books max is .007.
>
> I wouldn't worry about it.  The boat style rockers are apparently designed to
> have lots of initial slop, which is taken away by the hydraulic lifters.
>
> As Rik mentioned, one important warning to remember, is that with the boat
> style rocker arms, the oil holes on the rocker arm shaft face DOWN, not up as
> indicated in the book for the folded metal type.
>
> Regards,
>
> John L.
> ------------------------ (