2001 Road Glide TC88(EFI)
Stage 1 intake
The breathers are vented to the atmosphere, and there seems to be an unusual amount of oily air coming out of the hose. I also noticed that on the left rear side of the rear cylinder oil is coming out between the head and the lower rocker box. Should I just replace the gasket? what else should I check. I dont really understand the breather system.

Thanks
Jeff

 

How many miles? What has been modified and when? Rocker cover fasteners may be loose or a gasket might be required. A compressions and leak down test will reveal a lot.

 

Thanks for the reply

88k miles
HD Stage 1 intake
S&S 509 cams, S&S spremium lifter, S&S adjustable pushrods, Roockout rocker kit, Thunderheader, PC-V

 

Sounds like time for a rocker box gasket job along with the new style stamped breather units. As mentioned though, at 88k miles I would do a comp/leak down to see how things stand before tearing into anything...

 

A compression and leak down test will show the condition of the top end. However, at 88K miles, I suspect ring seal is the issue; time to rebuild the top end. Bore to 98", have the heads ported if budget will allow. You could keep the 509s but a set of CR575, TMan 555 Torkster or Andrews 48 cams would be a better choice. As has been suggested, the late style breathers would be a good addition to the upgrade.

 

I did a compression check 150 Front and 155 rear. I dont have a leak down tester yet but ordered one and it will be here thursday and I will check that then.

DJL
Do you think if I just do the top end I will be ok? How do I know if the bottom end needs adressing?

 

With the 509 cams, compression should be about 170psi at sea level; not great but with 88K miles, not terrible. The early models, up through '02 has forged cranks and a Timken left side crank bearing; pretty bullet proof under normal use and I wouldn't be worried about the lower unit. Do the leak down test and see what that shows.

 

I live in North east CA at about 4000 FT How would that affect the compression. Thank you for your help!

 

Less air at altitude = less ccp.
Scott

 

At that altitude, your CCP is spot on, so ring seal may not be the source off the excess oil at the breathers. Do the leak down test and post the results.