[TR] Triumphs Digest, Vol 2, Issue 562

[John Walker]

In 1975 I overhauled the engine in TR-3B TS68368, including replacing the
pistons and liners with new ones from JC Whitney ($250). I am doing the same
thing again, hopefully with more care and attention to detail. When I
disassembled the engine, I noted that those pistons had four rings, along with
several cracks and split liners, so I suspect your 4-ringers are similar
aftermarket items.

John Walker TR-3B TS68368
Reno, NV


-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Bob Nogueira
Sent: 17 November 2008 05:21 AM
To: triumphs at autox.team.net
Subject: [TR] TR3 Engine Rebuild

I'm starting the rebuild of a spare TR 3 engine from spares parts that I
have accumulated over the years and have a few questions that I hope the
list can help me with some of them.

1. Ten years ago I had a valve job done and remember reading about
differences in the either the valves or guides. What are the options and
recommendations when having a valve job done?

2.   Since I have two heads from which to choose for the engine could
someone advise me of what to consider in choosing which to rebuild. Based on
TeriAnn's excellent webpage, one of the heads is a TR 4 with the flat area
over intake #1 and chamfer on the port side of the combustion chamber. The
other is a late TR 3A head, has the diagonal slant under the thermostat
housing but does not have the raised flat over the #1 intake. Are the valves
and springs inter changeable between theses two heads ?


2. Among my collection of parts I noticed pistons with three rings and some
with  four rings, one oil ring being below the wrist pin. When did this
change occur and what are the pros and cons of each.

Any assistance will be greatly appreciated

Bob Nogueira