Main bearing issue

[Whippet]

Hi guys, just in the process of rebuilding a rocket engine, ordered the correct main bearing shells according to crank journal od and crankcase id, fitted them, torque and degrees main bolts. Problem started.. crank tight to turn, removed everything and double checked journals, crank okay, checked crankcase.. found 3 of the 4 mains the same size and then measured the main bearing that the crank uses as a end float cap to find its slightly smaller than the rest.. what to do ?? I an using red shells.

 

[Tripps]

Contact your supplier would be my first thought.

 

[ozrider]

maybe @warp9.9 might have a suggestion.... good to see you back on here @Whippet.

 

[warp9.9]

If the rear was different yet still in their limits I would suspect it had a different color shell. Although m8ne were all the same. I see know reason a odd color can't be used as long as it meets the clearance specifications. Were the old shells red ?

 

[Claviger]

Many cars are like that, makes ordering bearings a PITA.

 

[Whippet]

If the rear was different yet still in their limits I would suspect it had a different color shell. Although m8ne were all the same. I see know reason a odd color can't be used as long as it meets the clearance specifications. Were the old shells red ?

I believe so, as i have only found 2 in the pile of bits. Pretty sure the red shells are the thinnest ?

 

[Whippet]

maybe @warp9.9 might have a suggestion.... good to see you back on here @Whippet.

Its been awhile for sure.

 

[Pedro]

I have had 5 different engines apart and they all had 2 different size bearings.Use plastigage
to check correct clearances

 

[warp9.9]

I have had 5 different engines apart and they all had 2 different size bearings.Use plastigage
to check correct clearances

Now here a man in the know. Happy Fathers Day Peter