[Healeys] Overdrive pump queries

[gradea1 at charter.net]

Simon-great that David helped you with the proper tool. I'm sure he
agrees that the fitting of the pump body and ball is critical to get
good pressure. (that suggestion from someone to stretch the spring for
more contact is a workaround) I think if you use good replacement
parts that won't be necessary. With the original unaltered parts you
should achieve between 450-500 lbs. which is enough to overcome the
springs of the direct drive position.
1- Its easier on the bench, but you should be able to get to the pump
in position with the unit in the car.
2- You insert a screwdriver in the channel where the ball goes and
"guide" the plunger so that it goes as stated with the flat to the
rear and it will fit the guide peg, and the hole will end up exactly
facing the channel for the ball, etc. (this may be hard to see in the
car as it quite low and you will have to stick your head to the
floor!) Be careful not to damage the seat!!! I would use a wood dowel
rather than a screwdriver, but if you are careful not to exert
pressure and distort the seat then OK. You might need two people to do
this-one below to tap the pump home, and one above guiding it.
The trick is to not damage anything by stressing parts. Most important
is, as you say, the plunger must be free to move up and down with the
cam action.
It does appear that the issues you were having were that the plunger
was not free to ride up and down with the cam to produce pressure.
Whoever glued it in position was not understanding how the overdrive
works. Good luck, Hank

	-----------------------------------------From:
simon.lachlan at alexarevel.plus.com
To: "David Nock"
Cc: "Healeys"
Sent: Monday August 30 2021 5:30:17AM
Subject: RE: [Healeys] Overdrive pump queries

	Hi, 

	David has already steered me in the right direction with regard to
the reamer. 

	And a further query….. 

	It seems very likely from what I confront in my car and from the
advice received to date – for which many thanks -..it seems very
likely that the issue is caused by the pump plunger being stuck or, I
suspect, not quite orientated. 

	Despite what you guys suspect by now(!), I study form religiously
before I delve into these things and have been brought up short by a
section in the BMC manual, Section G8, “Pump Valve”. One is told
how to put the “pump body” back in using one of many mythical
special tools and then the manual addresses the insertion of the
“plunger” (piston):- “The pump plunger is prevented from
rotation when in position by a guide peg carried in the front casing.
When assembling the pump, the plunger should be inserted with the flat
on its head facing the rear of the unit. It is possible to guide it
past the guide peg by means of a screwdriver inserted through the side
of the casting”. 

	* Can that procedure be carried out when the OD is still in the car
as is implied by the manual?
 	* If so, where is the access point through which one can insert a
screwdriver? (Strikes me that oil would gush out…..If the pump ever
restarted pumping!)
 	* If not so, is there a trick involved in getting the plunger up and
correctly sited?

	Simon 

	FROM: Healeys  ON BEHALF OF Henry G Leach via Healeys
SENT: 30 August 2021 01:57
TO: 'David Nock' 
CC: 'Healeys' 
SUBJECT: Re: [Healeys] Overdrive pump queries   

	David-help this guy out here...he is getting desperate! He has been
at this project for months and can't get enough pressure. What size
reamer and where can he get one? He lives in UK. Thanks, Hank 

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

	From: "David Nock"
 To: gradea1 at charter.net
 Cc: "Michael Salter", "Healeys"
 Sent: Sunday August 29 2021 12:28:02PM
 Subject: Re: [Healeys] Overdrive pump queries

 Smacking the check ball will not make a new seat in the pump. You
must cut a new seat with a special reamer.    

	David Nock   

	
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20210830/51cba259/attachment.htm>