Hi Jeffrey,
Looks like a bit of a mix and match setup. 1st clue is that it was in an MG!
That's definitely a late TR4A engine number. So, at least the bottom half is
about 1966-67 vintage. It also has the blocked off breather hole on the
lefthand side, ala TR4A. Dipstick location confirms it's a TR motor.
Valve cover is also 4A, but the intake manifold appears to be earlier. Carbs
are H6 from early TR4 (up to about 26,000 if I recall correctly) or TR3
(maybe that explains the intake manifold too).
The pictures don't tell me about the exhaust manifold. If it has two outlets,
it's TR4A (and a pretty efficient manifold, for a cast one). If it has a
single large outlet, I'd guess it's TR4.
Starter motor is a bit of a baffler... at least it's a Lucas, judging from
the end plate!
The gearbox numbers you gave aren't helpful. The important one is stamped in
the backside of the boss where the clutch cross shaft enters the bellhousing,
the two letter prefix tells what type car it was originally fitted to. "CT"
plus 4 or 5 numbers would be a TR gearbox.
But, take that info with a grain of salt. Rebuilt gearboxes with TR innards
can carry all sorts of strange prefixes like "MB", etc., indicating they
originally left the factory in a Triumph sedan model. When rebuilt, they
presumably
where fitted with correct TR gear ratios and so forth.
Another clue... The flange on the gearbox is the earlier, thinner type used
on TR3 and early TR4. Longer shift lever is more likely early 4 or TR3, too.
You probably already know, TR4 and later gearboxes have synchro on all four
forward gears, while TR3 have it on 2nd, 3rd and 4th (except for the rarer
TR3"B").
You're right, the heater valve is TR3ish.
The fan looks like the rare "tropical" 6-blade option offered for TR4/4A, I'm
not sure if it was ever offered for use on earlier TRs. But, as you pointed
out, it's in the wrong place! Should be on the crank pulley, not on the water
pump pulley. That might have been done to adapt the motor for use in the MG.
Who knows!
Hope this helps!
Cheers!
Alan Myers
San Jose, Calif.
'62 TR4 CT17602L
CT74096E
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