itchyfeet wrote:I wonder if that means your engine case pump bore is slightly smaller.
reading back to page 14 of this thread...
bigbadbob76 wrote:I also measured my oil pump body- 69.93mm and it's hole in the case- 69.97mm
That was my 26mm pump measured with my cheap digital callipers but while they might not be super accurate, they're close enough.
so 0.02mm all round, that's snug!!!
And I just found a scribbled note on my desk that says body=69.8mm, groove 1.5-1.7mm.
That was your 30mm pump measured with a different digital calliper.
The groove appeared to be slightly eccentric to the body which is probably why you rejected it.
So ( 69.97-69.8 )/2 = 0.085mm clearance all round.
Your 1.78mm O rings would take up that well enough with 0.18mm of compression when sat in an average 1.6mm groove.
'86 1.9 DG, 4 spd, tintop, camper conversion.
Split case club member.