[Healeys] 100 generator pulley diameter

Mon Jul 10 17:46:13 MDT 2023

Hi Mark-great shot of you and your car racing-sorry I do not remember
the pic on the Snowmass brochure but then that was sometime ago. The
silver brochure does not have any of those photos. But I have
everyone's autograph. Gosh DMH is gone 35 years now (7-3-23-his
birthday he would be 125).
So here is the scoop on the generator (dynamo) pulley. There was an
early dynamo issue in 1953 -Austin part 3H1834 (Lucas 22519). The
later 1954 on to 100-6 uses generator 11K 100 (Lucas 22483). The
Austin pulley is 1B1727. 
In addition to the stamped number, the early unit measures 9-29/32"
and the later measures 10-3/16. This has a different backplate and
"oiler" when upgraded in 1954.
Checking my car, and as I suspected, a replacement generator dated
1958 has a 3.5" pulley. It appears that all units had a 3-1/2 pulley
but Lucas sells it sans the pulley so Austin supplied it-part number
above. The photo shown here, when I assembled the car in 2015, has the
incorrect pulley mounted.
If your friend in Auckland has a smaller pulley he could have the
early unit on the later car? Check the number on the generator body
with a mirror. His, if correct for 1955, should be 3.5" and using the
later Lucas dynamo number. Then too, he just could have the wrong damn
pulley. Regards, Hank

	-----------------------------------------From: "Mark Donaldson" 
To: "Hank Leach"
Cc: 
Sent: Monday July 10 2023 3:24:33PM
Subject: RE: [Healeys] 100 generator pulley diameter

	 Hello, Hank, 

	 A puzzle to which I suspect, I’ll never know the reason. 

	 When I rebuilt my 3000 race car engine recently I fitted a generator
because it is going to be road-registered. 

	 I fitted a slightly larger pulley to keep the generator revs just a
little lower. 

	 I do not plan on driving it at night, so full capacity charging will
not be an issue. 

	 That said, I used to race my BN2 40 years ago, but the wider pulley
was already on it. 

	 Like you, I have several Lucas charts too. Some of mine came from
Scott Morris. Very handy for reference. 

	 I also have many Lucas Parts Lists (hard copy) for all manner of
British vehicles, including cars, trucks, busses and tractors.  

	 Do you remember this photo on the back page of the Snowmass booklet?

	 Me at the hairpin at Auckland’s Pukekohe Park race track in 1981.
Kevin Faughnan liked the look of it.   😊 

	FROM: Hank Leach 
SENT: Tuesday, 11 July 2023 4:34 AM
TO: 'Mark Donaldson' 
CC: 'Michael Salter' ; 'Healey List' 
SUBJECT: RE: [Healeys] 100 generator pulley diameter   

	Guys-there are any number of aftermarket or rebuilt generators over
the years. Good chance that someone jazzed up the generator to get
more output by changing the size of the pulley. I think that was the
case with mine, as the car was raced, so electrical output was
important.  

	I will look up the generator parts in the Lucas charts, but more than
likely there is no mention of diameter size. Hank 

	----------------------------------------- 

	From: "Mark Donaldson"
 To: "Michael Salter"
 Cc: "Hank Leach", "Healey List"
 Sent: Sunday July 9 2023 8:57:14PM
 Subject: RE: [Healeys] 100 generator pulley diameter   

	FROM: Michael Salter 
SENT: Monday, 10 July 2023 3:13 PM
TO: Mark Donaldson 
CC: Hank Leach ; Healey List 
SUBJECT: Re: [Healeys] 100 generator pulley diameter    

	There is only 1 part number for all 100 generator pulleys so pretty
unlikely that there were different diameters.   Agreed 1B 1727  

	Lots of exchange generators back in the day.  The car was imported to
NZ in 1964. Surely a generator wouldn’t have packed up in just 8
years?   

	My BN2 which is very close to yours has only 27K miles and the
generator date is correct 5 /56.   

	What is the date on yours?  11 55 . . . and number 22483A, which is
correct for a BN2   

	M 

	I realise one cannot always make an accurate measurement from a
photo, but this Moss repro pulley looks, to my eye, to be more than
3.25” OD 

	Now I am totally confused. 

	On Sun., Jul. 9, 2023, 10:20 p.m. Mark Donaldson,  wrote:     

	Hank and Michael, 

	Thanks for your replies. 

	Now I am curious. I am 99.9% sure my generator pulley is original.
The car was sold new in Guernsey in the Channel Islands.  

	It is BN2 232844 11 June 1956 and the engine has never been out of
the car, though I gave the generator a tidy-up 10 years ago. 

	As Hank points out, it is possible that various diameters may have
been interchanged with other models during 100 production. 

	So our local Auckland member with a 3” OD pulley may well have the
right one for his 1955 BN1 

	Michael, I’ll have him measure it again to see if in fact it is a
3.2” pulley . . . and not 3” 

	 QUESTION:  Might my 3½” OD pulley be correct for a late
production BN2? 

	Mark 

	Ardmore 

	NZ   

	FROM: Hank Leach 
SENT: Monday, 10 July 2023 5:22 AM
TO: 'Mark Donaldson' 
CC: 'Healey List' 
SUBJECT: Re: [Healeys] 100 generator pulley diameter   

	Hi Mark-had a similar problem with my early 100. The pulley mounted
to the generator turned out to be the wrong one and the belt lineup
was askew. The correct one shown is I believe about 3.25" and runs
true. Since there were so many of these blocks used on A70, A90 and
other saloons of the period, I could see how they got mixed up.
Regards, Hank 

	----------------------------------------- 

	From: "Mark Donaldson"
 To: "Healey List"
 Cc:
 Sent: Sunday July 9 2023 3:41:39AM
 Subject: [Healeys] 100 generator pulley diameter  

	Learned gentlemen, 

	The pulley on my 1956 BN2 is 3½” diameter. I believe it to be
original. I’ve owned the car for 45 years. 

	A friend has a BN1 with a pulley diameter of just 3”. He thinks it
is original. I don’t. It got me thinking. 

	I believe his is incorrect as it was converted here in NZ from a LHD
import some 30 years ago. BN1L 226180 

	The car has some clumsy conversions made to change it to RHD, so I
don’t know what else might have been ‘cobbled up’ to get the car
on the road. 

	Can somebody of you please confirm that 3½” is correct. 

	That said, I need another for a second 100 engine I am building as a
spare. 

	They seem to be scarce down here in NZ, and repros seem to be rather
expensive. 

	Fingers crossed. 

	Mark 

	Ardmore 

	NZ
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