ausmini
https://www.ausmini.com/forums/

Oil pump rotor end clearance
https://www.ausmini.com/forums/viewtopic.php?f=2&t=83340		 Page 1 of 1
Author:  drmini in aust [ Sun Nov 03, 2013 8:44 am ]
Post subject:  Oil pump rotor end clearance
I have just bought a new pin drive S pump, it felt like the shaft/inner rotor had a lot of clearance when checked by hand.
So, I bolted it together and put a dial gauge on it. There is .005" end clearance there, which to me seems a lot for a new pump (pumps lose oil pressure when the rotors have worn the end cover).
I am going to strip it and face the body to give max .002" end clearance, anybody care to comment?
Author:  Phat Kat [ Sun Nov 03, 2013 8:54 am ]
Post subject:  Re: Oil pump rotor end clearance
I'll be doing one in the morning or later this afternood, I'll let you know how it goes... can I ask what brand of fuel pump it is or where you got it?
Author:  Mick [ Sun Nov 03, 2013 9:08 am ]
Post subject:  Re: Oil pump rotor end clearance
Factory docs say reject at 7 thou :shock:
Author:  drmini in aust [ Mon Nov 04, 2013 11:15 am ]
Post subject:  Re: Oil pump rotor end clearance
I took it apart, clocked the face up in the lathe and faced .003" off the body. It feels much better now with .002" end clearance.
Pump has had an Oz made S shaft put in it, but I wonder where the pump was made...;-/
Author:  John Smidt [ Mon Nov 04, 2013 11:58 am ]
Post subject:  Re: Oil pump rotor end clearance
Phat Kat wrote:
can I ask what brand of pump it is or where you got it?


I would like to know as well Kev may save me buying sub standard parts
Author:  MiniVLT [ Thu Nov 07, 2013 2:20 pm ]
Post subject:  Re: Oil pump rotor end clearance
Just out of interest, I checked my new A+ slot drive pump from Minispares UK, GLP138.

0.0025" - 0.003" end clearance. 0.0025" feeler gauge slid in easily & the 0.003" feeler gauge was too tight!

Cheers Shane
Author:  minimanic [ Thu Nov 07, 2013 7:57 pm ]
Post subject:  Re: Oil pump rotor end clearance
I used to find this problem allot a few years ago, mostly with pin drive small bore pumps.
One brand new pump had enough clearance that it bleed down after initial startup and would not build oil pressure again unless primed.
I have had to do the same as drmini numerous times to get the clearances right.
I now check each pump I fit, but haven't had a problem for a while now.
Once faced and the clearance set they have been completely trouble free.
Author:  Mick [ Thu Nov 07, 2013 8:01 pm ]
Post subject:  Re: Oil pump rotor end clearance
What's the proper method for facing them? Can this be done at home without machine tools with any success? (perhaps on oiled emery over a piece of glass??)
Author:  minimanic [ Thu Nov 07, 2013 8:10 pm ]
Post subject:  Re: Oil pump rotor end clearance
The first few I did were oiled emery on glass method. Just go carefully in a fig 8 and turn regularly.
These all worked perfect.
One engine in a daily driver so far has done over 100,000km, no problems and holds good oil pressure.
Author:  drmini in aust [ Thu Nov 07, 2013 8:44 pm ]
Post subject:  Re: Oil pump rotor end clearance
Glass is OK but is not always flat, particularly these days. If you can find something that has a flat machined surface that is better.
Page 1 of 1 All times are UTC + 10 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/