adrial

When measuring with plastigauge, I would assume you want all surfaces clean and free of oil.

So I would assume i dont need to worry about scratching up the main/rod bearings when torquing them down without oil so long as I dont turn the crank/rotate the rods...

I need to oil the bores prior to installing the pistons/rods..correct?
Just use standard dino oil?


Just want to be doubley sure

TIA,
Adrial

OZ951

Yes you do the measurement with a dry crank and you avoid rotating the crank (you'll mess up the plastigauge if you rotate the crank anyway. You can put a very light film of oil on the bearing cap but I prefer not to.

Yes you pre oil the piston rings before installing the assembled piston to the block. You can in fact immerse the assembled piston into an oil bath until the rings are completely submerged so that they get a good fill of oil into the rings & grooves.

Edit -> There is a pic I took of the platiguage measurement of my crank on my rebuild page if you need it for reference.

Mike B

I was told by an engine tech to use 50 weight oil which is what I did. I poured the oil into a shallow container and set the piston with rings into it. I also applied a film of oil to the bores just in case. No problems then or 7K miles later.

adrial

Thanks guys.

Edman951

Just a quick tip in case you didn't know..
Make sure you get all of the plastigauge off after.
Specially on the crank it tends to leave impressing marks.
My friend own an engine shop and he told me many people forget to clean it up and blow their bearings.