Breather assembly question
Thread Starter
|
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Breather assembly question
After going back and forth about doing this, I finally pulled my top end. My question is do I need to get whole new breather assemblies if I remove them or are the gaskets and umbrella valves included in the cometic top end kit all I need? I just see in the fsm anytime it's disassembled it my must be replaced.
This is on a 2013 103. I'd like to replace the umbrellas while I'm doing this since I have them even tho I wasn't having any issues with them...yet.
I'm pulling the heads just to replace the gaskets with the .030 to tighten the squish. It will also bump my CCP from 190 to 197/198ish according to the BB calculator.
I have tinkeritis and this top end kit has been sitting here since I did cams just calling my name. With my CCP at 190, raising compression wasn't really all that necessary.
Also, if I'm right in my thinking, I would need to back my S&S quickies off by 3 flats to make up for the .015 difference in gaskets correct? Each flat being .00583. Or should I just go 2 flats back preloading the lifters slightly more than .140?
This is on a 2013 103. I'd like to replace the umbrellas while I'm doing this since I have them even tho I wasn't having any issues with them...yet.
I'm pulling the heads just to replace the gaskets with the .030 to tighten the squish. It will also bump my CCP from 190 to 197/198ish according to the BB calculator.
I have tinkeritis and this top end kit has been sitting here since I did cams just calling my name. With my CCP at 190, raising compression wasn't really all that necessary.
Also, if I'm right in my thinking, I would need to back my S&S quickies off by 3 flats to make up for the .015 difference in gaskets correct? Each flat being .00583. Or should I just go 2 flats back preloading the lifters slightly more than .140?
Seasoned HDF Member
Joined: Nov 2004
Posts: 8,129
Likes: 1,981
From: Ottawa, CANADA
You can reuse the stamped steel housing components, with the new umbrellas and gaskets in the kit. Just make sure you get all the old gasket material off. The complete assembly from HD isn't that expensive, though, if you prefer to go that route.
For the pushrods, I would just go through the preload setting procedure as though I was installing them for the first time. That way, you know exactly what you're setting the preload to, without any guessing.
Cheers!
For the pushrods, I would just go through the preload setting procedure as though I was installing them for the first time. That way, you know exactly what you're setting the preload to, without any guessing.
Cheers!
Thread Starter
|
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
That makes sense on the pushrods and I figured as much on the breathers but wasn't sure since I haven't had one apart yet.
This was another reason I decided to do this. For those that think it's acceptable to keep breathing into the intake. The original owner of my bike did so for 29,000 miles. This is what your pistons will look like. Keep tell8ng yourself the EPA mandated internal crankcase breathing is ok. Obviously it is NOT.
The good news is I have zero deck height. Actually slightly above with the carbon. lol
This was another reason I decided to do this. For those that think it's acceptable to keep breathing into the intake. The original owner of my bike did so for 29,000 miles. This is what your pistons will look like. Keep tell8ng yourself the EPA mandated internal crankcase breathing is ok. Obviously it is NOT.
The good news is I have zero deck height. Actually slightly above with the carbon. lol
Last edited by 60Gunner; Oct 9, 2020 at 12:26 PM.
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,668
Likes: 7,259
From: OH
I did vent to atmosphere upon reassembly just because "it couldn`t hurt and costs almost nothing"
Now, back to the program in progress
Thread Starter
|
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
I've been breathing to atmosphere the past 3000 miles now and running sea foam in my fuel because I knew it would be carboned up from previously. It's coming off fairly easily but is time consuming. That sh!+ will glow red and pre-ignite.
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
Last edited by 60Gunner; Oct 9, 2020 at 01:28 PM.
Seasoned HDF Member
Joined: Aug 2011
Posts: 11,814
Likes: 5,120
From: SW Ohio
I've been breathing to atmosphere the past 3000 miles now and running sea foam in my fuel because I knew it would be carboned up from previously. It's coming off fairly easily but is time consuming. That sh!+ will glow red and pre-ignite.
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
Seasoned HDF Member
Joined: Nov 2004
Posts: 8,129
Likes: 1,981
From: Ottawa, CANADA
I've been breathing to atmosphere the past 3000 miles now and running sea foam in my fuel because I knew it would be carboned up from previously. It's coming off fairly easily but is time consuming. That sh!+ will glow red and pre-ignite.
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
I've seen worse but there's no way breathing hot oily air can be deemed harmless and the power loss has been well documented on a dyno...repeatedly.
One more thing...what's up with drilling out the oil drain in the support plate? Good idea?
Cheers!
Trending Topics
Thread Starter
|
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
Good deal. Thanks guys. It was worth the effort just to get that carbon cleaned up. I'll run it like she is now for another year or 2 if I can go that long without getting bit by the power bug.
This should be a slight increase in power with the .030 head gasket tightening the squish. My pistons are only .003 in the hole. Should put my CCP around 197ish.
This should be a slight increase in power with the .030 head gasket tightening the squish. My pistons are only .003 in the hole. Should put my CCP around 197ish.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread Starter
|
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
After spending nearly an extra day at this cleaning up the carbon deposits from the previous owner's stupidity running the stock breather system, got this project done and all is well. Well almost. Seems I messed up an o2 sensor in tbe process but no biggie.
Compression is better than I thought at 200psi on the nuts. Figured I might lose some after cleaning up the carbon deposits but nope.
Compression is better than I thought at 200psi on the nuts. Figured I might lose some after cleaning up the carbon deposits but nope.
Last edited by 60Gunner; Oct 11, 2020 at 06:00 PM.
Road Master
Joined: Mar 2020
Posts: 1,077
Likes: 267
From: New England
Gentlemen, I have read about this a few times on these forums. Can anyone spell this process out in layman terms, and explain what it accomplishes? Is there a YouTube video or write-up on this?