RE: [alfa] Tach drive on waterpump

["Jeff Greenfield" <alfaguy@xxxxxxxxxx>]

Biba - 

There is a gear that comes out through the front cover (it is part of the
intermediate timing gear) that drives the tach. There is a matching gear on
the other end of the pin that the cable engages into that meshes with the
gear that comes through the cover.

If that tach drive turns freely, then something is wrong somewhere. Keep in
mind that the later intermediate gears (from Alfettas on more or less) did
not have this protruding gear as the tachs were electronic.

It wouldn't surprise me if alfa used different gears/tach drives throughout
the years so perhaps one must use a matched pair?

HTH,

Jeff

-----Original Message-----
From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided] On Behalf Of
alfacybersite
Sent: Monday, October 27, 2003 2:20 PM
To: AD
Subject: [alfa] Tach drive on waterpump

Should the tach drive end rotate freely when not in use? Does oil
pressure (or?) force the internal drive pin to turn the gear by friction
alone? (I switched out the tach gear from an older water pump and
installed in 2000 engine). It rotated freely in the old pump also.

On customer's 1750 engine the tach cable is to firmly attached to the
drive to remove, but can't turn the cable by hand. Checking on another
'loose' engine (which has sat for eons, including outdoors) its drive
won't move - but could be frozen.

Pressing two small shafts together by friction alone doesn't seem like
an accurate way to drive a tach.

Biba
Irwindale, CA USA
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