After an engine sits for a long time, I always recommend option #1 -
spinning the oil pump. That way, it's the only moving part while oil
makes it's way into all the oil galleys and pathways.
Option #2, spinning the starter moter, still allows metal on metal
friction until oil makes it's way to the metal parts. If you're going to
use this option, at least remove the top valve cover and pour oil all
over the exposed parts.
For option #1, I took a large slotted screwdriver, cut off the handle,
and ground the tip to match the grooved slot of the pin on top of the
oil pump (at the base of the distributor mount). It takes a little
practice to get the parts in proper timing alignment afterwards, but
it's worth learning.
Fred - So.SF
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net] On Behalf Of roadster68
Sent: Friday, May 27, 2005 8:19 AM
To: James Hoffman; datsun-roadsters@autox.team.net
Subject: Re: a few questions
Hello Eric, My very basic understanding is that the 2000 engine started
as
a 1600 and an overhead cam was added. Apparently the biggest reason for
early failure was the fact that the upper timing chain was the last
piece of
the engine to receive oil from the pump. My manual confirms this. Guys
on
the list have recommended either 1.) removing the distributor and
rotating
the oil pump (counter clockwise) for a few minutes to get oil to the
upper
chain - if the car had not been run for a long time or 2.) disconnect
the
coil and just turn over the engine with the starter. Mine has been in
restoration mode for five years so hopefully other listers can give
better
advice. Good Luck! Larry.
----- Original Message -----
From: "James Hoffman" <ericerichoffman@yahoo.com>
To: <datsun-roadsters@autox.team.net>
Sent: Friday, May 27, 2005 6:01 AM
Subject: a few questions
> Hi-
>
> How many miles do you guys think one should get from the U20 timing
> chain/tensioner/guides? How do I check for wear besides waiting for
the
> big loud racket when it's beat? Why do these wear relatively quickly?
I
> had a 280ZX with 225K miles & never replaced anything in the engine.
Of
> course it had updated technology but just wondering.
>
> Is there any significate difference in the U20 between 67.5 and 70?
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