Loren,
Welcome to the list. It is a great place to ask and learn about your car.
What you are hearing is caused by an upper timing chain that has stretched.
That is the reason it is slapping the L (which I find very handy if I have
to work on the head), and other things inside of the timing chain area.
Gordon Glasgow has an excellent discussion of this problem on his web site.
You can reach his roadster pages, which have a LOT of useful information by
going to:
http://www.gordon-glasgow.org/index.html
I replaced the upper chain in my engine as a short term answer to my problem
when I first put the parts car engine in my car. There are no funny noises
from the chains now. For my numbers matching engine I have a complete set
of new gears and chains waiting to be installed when I rebuild that engine.
Tom
69 2000
Portland, Oregon
www.fransfancies.com/datsun
-----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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