Can you guess the problem ?

[FDT]

I had a 09 FXD that i have been doing some work to for a customer, it has a 106 and a is running a set of SE 511 cams, V&H short shots. About 12 months ago he decided he wanted a bit more grunt so i raised the compression, done some porting, new AV&V guides and sent the head out to have the seats cut to fit 1.9 inlets, 030 head gaskets ccp around 195 (manual comp releases) all good after a tune we gained around 20hp he was happy. Then a couple of months ago he thought he had lost a bit of power so i run it back on the dyno and it has lost about 6hp, do a test and found front cylinder down on compression, pulled the head and found the inlet seat breaking away along the edges, no problem this time i am able to replace it with an oversize seat and re cut with my mill (.0003 runout ) put it all back together, power is back up to where it was, customer is happy again. A couple of weeks ago he gets in touch and says it has lost power again but this time is using oil and running like crap.He brings it to me and i see it puff out smoke from the front exhaust when i chop the throttle. Start to pull down again and when i removed the TB i see lots of oil in both the inlet ports, pull both heads and this is what i see.

[FDT]

Some more pics.

[FDT]

This one might tell a bit more.

[tmwmoose]

A leak down test would have narrowed it down for you least which cylinder or both

[FDT]

A leak down test would have narrowed it down for you least which cylinder or both

A leak down test would not have picked up what the problem actually was. Only front cylinder was blowing smoke on decel. But both plugs were oily.

[FDT]

The other cylinder.

[doubletrouble]

Between the chop of the throttle smoke and the decell smoke - those two descriptions would have me looking hard at the intake guide and or seal - and or seat and or cracked head. You asked for a guess.

[FDT]

Between the chop of the throttle smoke and the decell smoke - those two descriptions would have me looking hard at the intake guide and or seal - and or seat and or cracked head. You asked for a guess.

I was thinking the same considering it had new guides and seat installed, but they were both fine. I did use the AV&V valve seals as i have had issues with OEM seals leaking before.

[Trouble]

Problem with the breather system/umbrella valves?

[FDT]

Problem with the breather system/umbrella valves?

Nope everything fine there.

[FSG]

What do the rings look like?

[K4FXD]

Hard to tell from a picture, but there looks to be a large gap between piston and cylinder wall. Wrong size piston? Bad hone job? Bad rod bearing, causing wear in the cylinder.

Thats a lot of oil, if the pic is an optical illusion it has to be in the head.

Had a bad seat, probably has a bad guide also.

My guesses

[FDT]

What do the rings look like?

Compression was around 190ccp on both cylinders.

[FDT]

Hard to tell from a picture, but there looks to be a large gap between piston and cylinder wall. Wrong size piston? Bad hone job? Bad rod bearing, causing wear in the cylinder.

Thats a lot of oil, if the pic is an optical illusion it has to be in the head.

Had a bad seat, probably has a bad guide also.

My guesses

Nope piston skirt to bore around .0015, it does need a hone now though, this top end only had around 10,000 kms since the 106 kit was installed (not by me)
New guides and seals previously, there was not build up on the back off the valves they looked pretty clean.

[K4FXD]

Compression release letting oil in the cylinder?

[Thermodyne]

Looks like it's pushing oil out the breather to me.  But I don't think that the root issue.  If it lost compression, it's prolly the rings.  As in been a little warm and lost some tension.

But oil puddles first. 

Are the breather ports still plumbed to the face of the throttle body?  If so, I would address that and open up the drains.    And if the breathers were reused last time, I would replace them with the new style this time.  Be sure to use the correct gasket under the breather stack, I see a lot of them where the old style cover gasket was used under the breather stack.  Might as well not have a breather valve when the wrong gasket is used. 

Then I'd pull a jug so I could see exactly what the rings were doing.  Just a little extra crank case pressure can over tax the breather system. 

If the pistons are black to the second ring, it'll need rings and the jugs should be jigged up and checked.  If they pass that just scuff em with a ball hone and re-ring it.  I don't like the look of that cylinder wall in the photo where the piston is down.  Way too glossy, but it might just be the photo.  If those pistons are leaking bad to the second ring, and the fit on the rings was good, or the jugs are no longer round, you'll need to have a talk with the guy about cylinder heat, and how to manage it. 

[FDT]

Looks like it's pushing oil out the breather to me.  But I don't think that the root issue.  If it lost compression, it's prolly the rings.  As in been a little warm and lost some tension.

But oil puddles first. 

Are the breather ports still plumbed to the face of the throttle body?  If so, I would address that and open up the drains.    And if the breathers were reused last time, I would replace them with the new style this time.  Be sure to use the correct gasket under the breather stack, I see a lot of them where the old style cover gasket was used under the breather stack.  Might as well not have a breather valve when the wrong gasket is used. 

Then I'd pull a jug so I could see exactly what the rings were doing.  Just a little extra crank case pressure can over tax the breather system. 

If the pistons are black to the second ring, it'll need rings and the jugs should be jigged up and checked.  If they pass that just scuff em with a ball hone and re-ring it.  I don't like the look of that cylinder wall in the photo where the piston is down.  Way too glossy, but it might just be the photo.  If those pistons are leaking bad to the second ring, and the fit on the rings was good, or the jugs are no longer round, you'll need to have a talk with the guy about cylinder heat, and how to manage it. 

Breathers are working fine and the drains had been opened up, i have already found the problem which i will post a pic of, i was just curious to see if anyone could pick the problem from the pictures posted, 1 of the pics should have given it away.

[FDT]

Compression release letting oil in the cylinder?

From where ?

[K4FXD]

You did say guess. 

[harley_cruiser]

I bet the turbocharger blew a seal.
Opps, wrong thread, subscribed.

[harley_cruiser]

Do I get a second guess, no oil ring on the oil down tubes.
Edit, .03 metal, and that would not put it in the intake, so never mind.

[hdbikedoc]

looks like no return from head were the returns plugged

[kd]

I don't like the way that head gasket looks around the oil gallery in the first pic of the barrels. I would like to know what the "real" cams are (SE 511 ??) and check their timing to see if they could carry over to the other cylinder with the overlap.

[FDT]

I don't like the way that head gasket looks around the oil gallery in the first pic of the barrels. I would like to know what the "real" cams are (SE 511 ??) and check their timing to see if they could carry over to the other cylinder with the overlap.

Sorry typo SE211, head gaskets were fine.

[kd]

OK, then rings lined up?