Yes, the tensioner runs primarily off of oil pressure, although there is an
auxiliary spring inside.
If you trace the oil passages through the engine, you will find that the upper
timing chain
tensioner is the very last component to get any oil.
I really don't believe a fresh engine with all new components should make any
kind of rattle. If
it's just a little clatter from the rockers, that's one thing, maybe, but not a
chain rattle.
Ken Pearce wrote:
> Don't the timing chain tensioners on the U-20 run off of oil pressure? I
> forgot to run the oil pump with a drill motor before trying to fire up my
> new engine recently. It made a not-so-comforting noise for about 10-15
> seconds until it gradually went away. The engine still makes a short
> ratttle noise when it first fires up now for about a second. It's only
> when I first start it in the morning. What I've started doing now is to
> crank over the engine a bit before I pull out the choke and allow it to
> start. This has eliminated the noise as far as I can tell. My timing
> chain and all components are new. Should there be any rattle when first
> starting up? Even for just a second?
>
> Ken Pearce, 68-2000
> Lawrence, KS
>
> > Dan Neuman wrote:
> >
> > > I am startig to have a timing chain death rattle noise for a
>couple
> > > of seconds on startup. I know that this has been covered before. But how
>long
> > > can I go with this before I should change it. I am not going to be able
>to have
> > > time/money to change out the chains the right way till later this
>summer....
> > > Should I jsut do the chains-camshaft at the same time??
> >
> > --
> > Gordon Glasgow
> > http://www.gordon-glasgow.org
> >
> >
> >
--
Gordon Glasgow
http://www.gordon-glasgow.org
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