3 MB petrol crank measurements

[Little mule]

Hi all I got a call from my machine shop today and they had a question for me .

im a defender RRC and disco guy so bear with me lol 

the machine shop needs the min and max diameter of the surface for the rear crank seal  on a 3MB crank shaft . 

they are trying to save a crank and need to know what they need to turn It down to .

 

any help would be greatly appreciated 

 

tony 

[steve b]

My WSM only has main bearing diameter listed-

2.500" std

with undersize in 0.010" increments to 

2.460" max.

If I need info that I can't find , a quick call or email to Frida at Turner engineering usually provides the facts.

Steve

[Little mule]

Hi Steve 

thanks for the reply the machine shop already had those measurements. 
the main reason I need the measurements for the rear oil seal surface is because the had to do some welding to save the crank for the gentleman . 
personally. Would have swapped the engine out for a 5 MB but he is trying to do a full on restoration and keep as much of the original truck as possible .

thanks 

Tony 

[steve b]

Hi Tony

   I'd imagine the seal land is 2.500" too , an email to Turner Engineering should confirm that. 

Measuring a new two piece rear main seal ID might be useful too.

Steve 

[Little mule]

Thanks for all the help 

I actually found the measurement in one of my old series 2 manuals and it’s 2.5 inches if you have the old rope type seals .

again thanks for everyone’s help and time . 
 

Tony