Here are some pics of the engine opened up:

On initial inspection it appears the crankshaft is toast. Admittingly, I am using a crude measurement technique (digital calipers) but the journals appear out of round. The specification is 54.971mm to 54.990mm.

One sample measurement:

Journal Diameter Axis 1: 54.9x (within spec)
Journal diameter axis 2 (90 degrees from axis one): 54.2x (way out of spec)

How does the oil pump feel?

Like cold, oily metal. Just Kidding. Didn't take it out just yet. How should it feel?

It should turn very smoothly. The concern is if some small metal chips managed to get through the pick up screen and into the scavenge pump. The gears should look smooth when view through the ports as the shaft is turned.

Peter.

Yessir,......you will need another good, used std/std crank and a set of used rods.

I see some case fretting that should be closely inspected, too.

The oil pump should get disassembled and the case inspected for any scoring since these are Mg.

I may have this stuff here.

I have the following parts if you need them:

Oil Pump
Rods
P&C's
STD Cams

"I see some case fretting that should be closely inspected, too."

Educate me Steve.....what is "case fretting"?

Gordo

I was wandering the same thing. I have been studying the photos,but haven't figured it out yet.:rolleyes:


Emerald

Well I Googled it,and I think he is concerned with the unusual wear pattern above the second crank bearing from the right. Could be a sign of hair line cracks or fracture. That's my guess anyway. Just trying to learn something new.


Emerald

Yessir,...that's right,...:D

The case halves shuffled against themselves pretty hard in that area as well as some light fretting on others.

Race engines get shuffle-pinned in two places on each main bearing web to help prevent this, but that's overkill for street motors.

In this situation, it deserves a closer look and examination.

I had to google it too. Photo supplied via the interwebs.

I see something similar on the last "monument" mounted bearing on other end of the case....got it!
Gordo

Peter, the IMS bearing looks beat (not related to anything you did) so a minor consolation in splitting the case is you avoided another tear down. Glad that suggestion paid off. Just one of those "been there done that" scenarios.