Page 1 of 1

Third Piece - Small vs Large Oil Pump

Posted: Wed Jan 19, 2011 11:47 pm
by Marc Allingham
How can I tell if the third piece on my '60 coupe has the small or lager oil pump?

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 5:13 am
by Jon Bunin
Small pump cover (L); Large pump cover (R):

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 1:44 pm
by Marc Allingham
Thanks for posting the pics Jon. I have an unstamped/blank third piece and I am trying to figure out if it is compatible with the early or later (large) pump. Are the specs the same or are there diferences? If so, can I look to any visual markers to distinguish between the two types?

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 2:11 pm
by Dave Wildrick
Marc Allingham wrote:How can I tell if the third piece on my '60 coupe has the small or lager oil pump?
If you smell beer, you don't have the small one.

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 2:23 pm
by Jack Staggs
That's funny! :D

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 2:27 pm
by Jon Bunin
Marc,

The small pump chamber is 24mm deep, slightly less than 1", and will have one gear shaft fixed in the housing. The large pump chamber is 36mm deep, almost 1.5", and will not have a gear shaft. If it's possible to post a photo, we can identify it as 356A/B/C or 912.

Dave, if the other is an ale, it'll be difficult to tell any difference that way.

Re: Third Piece - Small vs Large Oil Pump

Posted: Thu Jan 20, 2011 9:01 pm
by Marc Allingham
Thanks again Jon. The one in my possession is the early version; measuring 24mm.

Re: Third Piece - Small vs Large Oil Pump

Posted: Sat Jan 22, 2011 12:00 am
by Alan Klingen
From the exterior the pump cover lays almost flat to the surface of the 3rd piece. The larger pump's body casting will rise about 6mm above the surface of the 3rd piece. The Porsche spec book says that up to motor, 356B, 75614 and 84771 it would be the small pump. Having said that you need to look at yours, my experience shows all sorts of things done to these motors over the years.

Alan

Re: Third Piece - Small vs Large Oil Pump

Posted: Sat Jan 22, 2011 12:57 am
by Marc Allingham
Can I replace my original third piece with one that has the large oil pump without making any modifications?

Re: Third Piece - Small vs Large Oil Pump

Posted: Sat Jan 22, 2011 12:26 pm
by Dick Weiss
Yes; just use the gasket to make sure all the holes line up--especially the oil ports.

Dick

Re: Third Piece - Small vs Large Oil Pump

Posted: Sun Jan 08, 2012 2:59 am
by Toby Primrose
are you interested in selling the blank third piece as I need one, please let me know either way, Thanks Toby

Re: Third Piece - Small vs Large Oil Pump

Posted: Sun Jan 08, 2012 7:03 am
by Michael Banchero
Figures, that my 60 roadster original engine (COA) has a small oil pump, engine 84830. Just a few numbers off the last of the smaller type.

Re: Third Piece - Small vs Large Oil Pump

Posted: Sun Jan 08, 2012 7:37 am
by Toby Primrose
so are you happy to sell the un numbered third piece? thanks Toby