Embarrassing update: cylinder hiss

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Desantnik-VDV
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Re: Rt cylinder hiss

Post by Desantnik-VDV » Wed Aug 14, 2019 1:52 am

Won't thee be oil leak/wet spots to look for as an indicator if the engine case and all surrounding is clean?
Alex

The rest is just a History:

1998 Honda f6 GL 1500 Valkyrie Tourer /Champion Escort sidecar
1999 Ural Deco Classic/BMW R100 engine
1980 BMW R100RT (2nd Heart Donor for 1999 Deco for more HP)
1978 BMW R80/7 (1st Heart Donor for 1999 Deco)
2002 Ural Barberian Classic
2003 Honda Shadow ACE
1999 Ural BC (went to US circus in Tokyo to adapt a bear driver)

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Lokiboy
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Re: Rt cylinder hiss

Post by Lokiboy » Wed Aug 14, 2019 6:31 am

Desantnik-VDV wrote:
Wed Aug 14, 2019 1:52 am
Won't thee be oil leak/wet spots to look for as an indicator if the engine case and all surrounding is clean?
It’s good to have fresh eyes. You’re right. As the saying goes “can’t see the forest for the trees”
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
90,000 km and counting

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Lokiboy
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Re: Embarrassing update: cylinder hiss

Post by Lokiboy » Thu Aug 15, 2019 4:27 pm

Update: Thanks for all the really good suggestions. I even called ski at Tri Quest and he was leaning towards a piston ring, from when I installed new ones a few months ago, was caught in the piston channel and not decompressing, thus allowing blowback.

As it turns out, when I did a major service and again when I was trouble shooting I incorrectly placed the washer on the stud for the valve cover. Apparently, both times the washer came off and was wedged between the wall and the stud nut. Tomcatfixer was in town and after a compression test and a leak test all seemed ok. He suggested we tip the rig on its side so he could better pinpoint the sound. Eureka! That’s when TCF saw the washer out of place.

I can’t count the number of times I’ve removed and replaced the valve cover and now on two consecutive times I do it incorrectly.

Again, thanks everyone for you suggestions. Am I ever embarrassed by such a rookie move.
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
90,000 km and counting

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Mr Wazzock
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Re: Embarrassing update: cylinder hiss

Post by Mr Wazzock » Thu Aug 15, 2019 4:34 pm

Image
Mike H
2016 Ural cT, in glorious terracotta
(aka Oranzhevaya Opasnost, "The Orange Peril")

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Tomcatfixer
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Re: Embarrassing update: cylinder hiss

Post by Tomcatfixer » Thu Aug 15, 2019 4:45 pm

That sound was remarkably difficult to pinpoint; it appeared to come from multiple directions, when you stick your head down between the tub and the bike. It was only when you lift the tub and put your head underneath that it became easier to pinpoint the source.
- Chad

Gordonsville, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "The Patrol", 1999 Ural Tourist "The RPOC", 1994 Honda VFR750F

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
Two different 1986 Yamaha FZX700S Fazers

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Tomcatfixer
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Re: Embarrassing update: cylinder hiss

Post by Tomcatfixer » Thu Aug 15, 2019 4:49 pm

Regrettably, I did not capture an image of the wayward washer sandwich sideways between the valve cover and the valve cover retaining nut. However, I did snap this pic of Erika, Lokiboy's stethoscope, my leak down tester, and Lokiboy's calves. :D
-
2019-08-15 16.46.03.jpg
You do not have the required permissions to view the files attached to this post.
- Chad

Gordonsville, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "The Patrol", 1999 Ural Tourist "The RPOC", 1994 Honda VFR750F

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
Two different 1986 Yamaha FZX700S Fazers

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Desantnik-VDV
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Posts: 194
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Re: Embarrassing update: cylinder hiss

Post by Desantnik-VDV » Thu Aug 15, 2019 5:08 pm

Great diagnostic efforts Dr. Lokiboy & Dr. Tomcatfixer!
Good to have another knowledgeable pair of eyes and ears locally who can ride with and come for rescue.
One more troubleshooting job done for the whole Ural community. Someone must create a Ural troubleshooting encyclopedia. This forum is already a big asset for the foilhead freunds.
Alex

The rest is just a History:

1998 Honda f6 GL 1500 Valkyrie Tourer /Champion Escort sidecar
1999 Ural Deco Classic/BMW R100 engine
1980 BMW R100RT (2nd Heart Donor for 1999 Deco for more HP)
1978 BMW R80/7 (1st Heart Donor for 1999 Deco)
2002 Ural Barberian Classic
2003 Honda Shadow ACE
1999 Ural BC (went to US circus in Tokyo to adapt a bear driver)

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Snakeoil
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Re: Embarrassing update: cylinder hiss

Post by Snakeoil » Fri Aug 16, 2019 7:14 pm

Given all the background noise on a Ural, finding or even hearing a hiss has to be a challenge. I suspect Chad might be used to finding tiny noises in loud environments, though.
Regards,
Rob
Proud member of the Peanut Gallery
2000 Ural Tourist
40 Pilots, 122 Mains
Before you say something stupid, always ask yourself, "What would Harpo say?".

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Tomcatfixer
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Re: Embarrassing update: cylinder hiss

Post by Tomcatfixer » Fri Aug 16, 2019 7:37 pm

Snakeoil wrote:
Fri Aug 16, 2019 7:14 pm
Given all the background noise on a Ural, finding or even hearing a hiss has to be a challenge. I suspect Chad might be used to finding tiny noises in loud environments, though.
Ha! Hardly. I'll share with you that one of my Veterans' Administration disability claims is for tinnitus. 26 years working in close proximity to turbojet and turbofan engines, and now my ears ring constantly. And that's DESPITE wearing hearing protection at work!
- Chad

Gordonsville, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "The Patrol", 1999 Ural Tourist "The RPOC", 1994 Honda VFR750F

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
Two different 1986 Yamaha FZX700S Fazers

RC20
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Re: Embarrassing update: cylinder hiss

Post by RC20 » Fri Aug 16, 2019 9:13 pm

Ha! Hardly. I'll share with you that one of my Veterans' Administration disability claims is for tinnitus. 26 years working in close proximity to turbojet and turbofan engines, and now my ears ring constantly. And that's DESPITE wearing hearing protection at work!
Other than non military, same issue. Around engines a lot and alwyas ear protection and since 40 or so, plugs and muffs.

Going through the process as another mechanic pointed out how bad his ear were despite both, I realized I had gotten used to it.

I figure 60% loss in one ear and the Tinitus and 40% in the other.
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

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