[Roadsters] U-20 Upper Tensioner Diameter?

[MH]

The R16 uses a hydraulic/spring loaded timing chain tensioner,  same
function as on the U20.

Mike Hudson  '67 - Stroker / 5-speed


----- Original Message ----- 
From: "Paul" <9laser3 at bright.net>
To: "'MH'" <twobeaners at earthlink.net>
Sent: Sunday, February 22, 2009 1:58 PM
Subject: RE: [Roadsters] U-20 Upper Tensioner Diameter?


>   I think maybe you're referring to shimming the cam towers on a U20.
Needs
> to be done when the head is milled in order to maintain chain tension.
> Since the R16 is a push rod engine with a short timing chain, all inside
the
> block, there is nothing to shim.
>
> Paul
> Ohio
>
> -----Original Message-----
> From: datsun-roadsters-bounces at autox.team.net
> [mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of MH
> Sent: Sunday, February 22, 2009 2:40 PM
> To: dave; 'Todd Osborn'; 'Roadster List'
> Subject: Re: [Roadsters] U-20 Upper Tensioner Diameter?
>
> I've been meaning to ask this question before, when the subject of
shimming
> chain tensioners has come up. Is there the same benefit of doing this on
the
> R16 timing chain tensioner?
> Mike Hudson  '67 - Stroker / 5-speed
>
>
> ----- Original Message ----- 
> From: "dave" <daveandlindab at comcast.net>
> To: "'Todd Osborn'" <todd.osborn at sbcglobal.net>; "'Roadster List'"
> <datsun-roadsters at autox.team.net>
> Sent: Sunday, February 22, 2009 1:10 PM
> Subject: Re: [Roadsters] U-20 Upper Tensioner Diameter?
>
>
> > FWIW, Copper sealing washers may be ideal, thin profile and durable.
> >
> > Dave Brisco
> >
> > -----Original Message-----
> > From: Todd Osborn [mailto:todd.osborn at sbcglobal.net]
> > Sent: Saturday, February 21, 2009 5:42 PM
> > To: 'Roadster List'
> > Subject: Re: [Roadsters] U-20 Upper Tensioner Diameter?
> >
> > >Gordon said:
> > >0.565" on the tensioner shaft.
> > >A 9/16" washer has an ID of 0.5625", so probably a little too small.
> >
> > The nominal ID of a 9/16 washer is 0.594 which gives you about 0.015"
> > clearance which should be about right. Gordon's right you will need to
> grind
> > a flat on one side to fit. I like idea of using Nylon or Delrin; but the
> > long term service temperature of these materials is fairly low (~200F)
so
> > I'm not sure how they would do in hot oil. Maybe a cut down brass
washer?
> > Todd Osborn (DATSFUN)
> > San Jose, CA
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