[Healeys] Engine number
manifold at telus.net
Fri Oct 19 19:18:06 MDT 2018
The engine serial number below is definitely from either a BT7 or BN7 built
between July 59 and Nov 59. It would have two SU HD6 Carbs. The Mk2 had the
engine prefix "29E" and had three SU HS4 carbs and started production in Mar
61. The side shift transmission continued until Nov 61 engine 29E/2246.
I have the same BMC parts manual with RU = Overdrive centre shift. That is
not correct. All of the "29D" and some of the "29E" series engines had a
side shift transmission.
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
Sent: Friday, October 19, 2018 9:23 AM
To: simon.lachlan at alexarevel.plus.com; Healeys
Subject: Re: [Healeys] Engine number
The tri-carb engines had the "29E" prefix. The center shift gearbox was
introduced during tri-carb production. So I would go with Clausager's
explanation. Shame he doesn't state what he thought the 'U' meant.
AHCA 3000 MkI registrar
On 10/19/2018 06:21 AM, simon.lachlan at alexarevel.plus.com wrote:
> It is 29D/RU/H4908
> 29 = 3,000cc (+/-!)
> D = MkI BT7 or BN7 (per Clausager)
> R= Overdrive fitted
> U = Centre shift (per BMC parts manual)
> The BMC manual is quite specific. See attached.
> Who is wrong? Did 29D engines continue into later tricarbs which is
> when, as I understand it, centre shifts appeared?
> Or what?
> I am considering buying an engine and rebuilding it. There's a block
> on eBay with that number on its plate. I think it's a MkI and that RU
> stands for overdrive and that U does not stand for centre shift.
> Am I right?
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