Visit The Dirt Forum for More Information

Author Topic:   oil clearances
garyl
Dirt Full Roller

Total posts: 68
posted April 23, 2005 06:49 PM  
got a rotating asembly for a355 chev, do these clearances look ok? rods .001.5 mains .003 rod side clearance .020 to .022 . the 1.5 on the rods are a loose 1.5 but are not close to being .002 What do you guys think? thanks.


awkwardjeff
Dirt Forum Champ
Total posts: 562
posted April 23, 2005 07:46 PM  

.0015 is not enough, if this is a standard crank you could use a .001 under bearing to gain enough..... if it's a loose .0015 like maybe .0017 you might want to use a half from the standard and a half from the .001 under bearings...... that is what I do with a new crank that is too tight like yo have...... if not a standard size or you don't care to buy two sets of bearings and mix uppers and lowers .........you will need to polish the crank to gain enough.

.022 side clearance is fine,

ford5
Dirt Forum Champ
Total posts: 711
posted April 24, 2005 06:11 AM  
Around these parts....an .001 bearing will tighten up your clearances? You will need an oversized bearing, not an undersized.

awkwardjeff
Dirt Forum Champ
Total posts: 562
posted April 24, 2005 09:55 PM  
Ford5, you are correct, and I should have watch my wording........they do make bearing that are .001 over and .001 under........one is for new cranks that are too tight......the other is for cranks that have been polished from standard and are now a little loose...... since the crank is too tight OVERSIZED bearings are what you need....... when we talk bearings we are talking about inside diameter......and that size needs to be bigger to gain more oil clearance. thus making it a oversized bearing

iginally posted by ford5:
Around these parts....an .001 bearing will tighten up your clearances? You will need an oversized bearing, not an undersized.[/QUOTE]


Back to the Archives