[Mgs] Overdrive Diagram - Finally!!!

Jack Wheeler jwheeler1947 at yahoo.com
Fri Jan 18 12:21:14 MST 2019


 Thanks to all for your help.  Using the pictures I received, I was finally able to figure out the problem.  I had the pump body assembled backwards.  I turned it around and reassembled everything.  Sure enough, the overdrive now works.  Thanks again.
Jack

    On Friday, January 18, 2019, 11:52:54 AM EST, PaulHunt73 <paulhunt73 at virginmedia.com> wrote:  
 
 Hi Jack, An incorrectly assembled relief valve or one with missing parts could certainly cause non-operation of the OD, as it allows pressure to build to a given point in order to move the sliding parts.  If pressure can't build the OD won't engage.  I can't see any shims in your picture, but usually they only affect the sharpness of engagement.  However in your photo the valve body with filter, next to the hex plug, is the wrong way round compared to the two photos in my link. As far as gear oil goes it was standard for the V8 and hasn't caused me any problems in 120k. Paul.  
 ----- Original Message -----  From: Jack Wheeler  To: PaulHunt73  Cc: Mglist  Sent: Friday, January 18, 2019 4:08 PM Subject: [Mgs] Overdrive Diagram - Update 2.0 
   Thanks, Paul.  That is helpful.  The problem still exists however, in that the diagram of the relief valve in the manual does not agree with the parts in my overdrive unit.  The picture you attached is like mine.  My question is, if the relief valve were installed improperly, would that cause the overdrive not to engage?  Yesterday, I reversed the plunger to get it in the correct alignment and reinstalled the entire assembly.  I drove it this morning, and it didn't seem to make any difference - the overdrive still did not engage.  Any additional thoughts?  Thanks. 
 Jack
 
   On Friday, January 18, 2019, 5:21:06 AM EST, PaulHunt73 <paulhunt73 at virginmedia.com> wrote:  
 
    I've just noticed I had a photo attached to this, didn't think the list handled attachments.   Anyway, that's not the oil pump but the relief valve assembly beside the solenoid plate that can be accessed directly.  The oil pump is 'under' the circular plug with two holes in the sump.   I've been into the relief valve on both my cars, and there are various configurations as shown here http://www.mgb-stuff.org.uk/goc.htm#3   I've not been into the pump but I'm attaching a scan of the exploded parts from the Laycock manual, Jack at least should get that.   PaulH.   
 ----- Original Message -----  From: Jack Wheeler via Mgs  To: Mglist  Sent: Thursday, January 17, 2019 8:20 PM Subject: [Mgs] Overdrive Diagram - Update 
  OK, attached is a picture of the components as they were installed in my oil pump.  I have removed it, and after carefully examining the assembly, I think I can see why it is not working.  I had the plunger (the item in the middle in the attached picture) installed backwards.  I had the long end of the plunger going down into the pump body, so of course, the plunger riding on the cam would not even contact the plunger going into the body.  When I turned the plunger around, the 2 plungers now come into contact with each other, thus allowing the pump to work. 
 I'd still be interested in any comments you have (other than "what a s***head").  Also, I'd like to get an exploded diagram of the unit in my car.  Thanks for any help you can give me. 
 Jack


  
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