Has anyone else who installed a powerbond UDP developed an oil leak from the front of their engine? I think it is called the front main (crank) seal which is right behind the UD crank pulley itself.

I noticed that the stock crank pulley had a small groove which the powerbond does not. This leak also could be partially due to the fact that I am running synthetic 5-20 oil? The oil leaks slowly...as in fractions of a quart over thousands of miles, but an engine with 15k should not have oil leaking.

On a side note I am impressed with the gains provided by the pulley on my 6.2.

Any thoughts?

 

Well for starters change the 5W20 and put 5W30 back in it, 5W20 is to thin of a oil for our motors. Second do you happen to have pictures of said groove on the UDP pulley, would be curious to see the difference.

 

The UDP has no groove like the factory crank pulley. The small groove (on the crank pulley) is very close to where it goes into the front crank seal...I assume that it has to do with keeping oil from leaking past the seal itself.

I will likely change back to 5-30 at my next oil change. I tried running the 5-20 because it is thinner and should help reduce friction and increase fuel mileage...not sure if I got anything out of it though.

 

what was the method of installing the pulley? did you retorque it? did you reuse the stock bolt?

 

I installed it using the SDPC pulley install tool and used an ARP BOLT. I did not actually put a torque wrench on it during installation though.

 

What did you use to tighten the bolt?

 

There is a torque procedure/spec for it no?

I know with the stock bolt you crank it down to 37ft/lbs then go 140*? past it.

 

not on an arp bolt. i personally like to get it 3/16" from bottomed out then i use my impact to tighten it up till it stops. i then loosen the bolt, then snug it back up and tighten it until the compressor comes on. i found that ARP crank bolt says 235ftlbs.
Ive never had an issue with any bolt ive put in with my method, all though i do have a pretty big impact.

 

what do you think the gains from an UDP will be on my 5.3L?

is it close to a headers or more like cold air intake?

 

They say 10-12rwhp but i cant say that for sure and i cant back it up with a dyno graph.


Ya gotta think about a 25% less drag on the acc drive should help out a good bit
so i say close to a CAI gain.