If there is enough slack in the chain that it has started to cut into the
bolt, then there is a lot of slack in it and should be replaced. The fact
that it has been wearing on the L-bracket means that even if it was in good
condition before, it isn't now.
You need to measure the head and see if it has been milled. If it has,
putting on a new chain without shimming the cam towers will still leave too
much slack in the chain.
Gordon Glasgow
Renton, WA
www.gordon-glasgow.org
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Loren Berg
> Sent: Monday, July 07, 2003 10:30 AM
> To: datsun-roadsters@autox.team.net
> Subject: U20 Timing Noise
>
>
> Hello everyone,
>
> > I'm new to the list and am posting my first set of questions.
> Here goes...
> >
> > I have a 1968 SPL converted to a U20 w/5 speed and it is making
> > some upper timing chain noise. I pulled the valve cover and can see
> > that the upper chain was cutting into the "L" bracket on the chain
> > guide and that the chain is also just starting to cut into the bolt head
> > holding on the chain guide. I cut off the "L" bracket as I heard that
> > this is one item that can fail with catastophic results. The gears
> > look O.K. as does the tensioner. The questions are, how can you
> > tell if the tensioner is bad? At what point do I need to replace the
> > upper chain and tensioner? Or should I replace both now?
> >
> > Thanks in advance,
> > - Loren
> > 1968 1600 converted to U20
> > 1970 2000 (parts car)
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