OK, I saw the balance valve this AM when I was re-checking the diagram. I ws
not sure what it was "balancing". Now I know.
So no bypass valve is needed in our filters for the TR2-4a. Not positive about
the 6 and 7. I suppose it will not hurt to have redundant bypass valves....
-Tony
-------------- Original message --------------
Yup, it's there. If you look at the diagram in the Moss catalog, they call it
a "balance valve", but what it does is allow oil to flow from the inlet side of
the filter to the outlet to the galleries, if the pressure differential exceeds
10 psi or so. My TR4 Bentley calls it a "bypass valve" though.
The only exception is the TR2-early TR3 bypass-type filter head, where the
output of the filter was routed to the pan. They had no need of a bypass
valve, because the engine was always fed with unfiltered oil.
On the full-flow heads for the TRactor motors, the Purolator heads have a
second big nut on the outside that is the bypass valve. Looking at the Moss
catalog, it looks like the Tecalemit heads have a plug inside the canister for
it (but I've never looked at one in person).
The valve you're talking about is correctly called a pressure relief valve,
since that's what it does.
Randall
-----Original Message-----
From: Anthony Rhodes [mailto:spamiam@comcast.net]
Sent: Thursday, March 24, 2005 7:54 PM
To: tr3driver@comcast.net
Subject: RE:Oil Bypass in the Filter Head
Randall, there IS a bypass in the filter head, but as far as I can tell from
the little schematic in the manual, the oil coming off the bypass goes back to
the pan, It is more of a pressure relief valve (~70 psi), from what I can tell.
Is there another actual bypass in the head where the oil will bypass the
filter and go on to feed the oil galleries?
-Tony
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