T-1 tach drive

[gkw]

Could someone on the list tell me what years oil pump with a mech tach
drive will bolt on my 66 912 engine. It currently has a flat plate
oil pump cover for an electric tach. I plan on running the original
mechanical tach in my 56 T-1.
Thank you, Gordon

[bbspdstr]

"Could someone on the list tell me what years oil pump with a mech tach
drive will bolt on my 66 912 engine. It currently has a flat plate
oil pump cover for an electric tach. I plan on running the original
mechanical tach in my 56 T-1.
Thank you, Gordon"

Any cover for a "big" gear oil pump engine. I know that a 16mm pickup tube engine's pump cover works, but I think any B or C/SC has the 36mm gears and would therefore work. The gears were the same as a 912 except for the (geared) drive end, so you will need that as well, as the later electric tach engines...356 and 912.... did not have that feature.

I suggest a glance at Stoddard's online catalog (or any other...or parts book...I have to bug out and can't do that right now, sorry) to be more sure.

[JTR70]

Its been my experience that the '64 C/SC "big gear" oil pump and tach assembly is a direct bolt-on to the 912 motor. Not sure when the change occurred in the B-series motors but I would bet the house that at least the S-90 had the big pump.

[Craig Richter]

For decades guys have been making this change in reverse. Full-flow oil pump cover and change to electric tach. Should be lots of these parts in the spider boxes...

[bbspdstr]

Craig, I just looked (again) in your book and found nada about tappets. You prefer flat or with a ever-so-slightly radius? I checked ALL my books to be sure my memory was still working a little, and found no spec for the slight dome. Walt always told me he did this grind "while watching TV."

Thanks,
-Bruce

[Craig Richter]

I don't recall exactly, but it was a BIG circle, like 40" or so. I do remember the gizmo machine Ray used...Walt probably still uses it.

Luck,
Craig