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What's that noise? #699598
06/25/17 11:12 pm
06/25/17 11:12 pm
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Offline OP
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desco  Offline OP
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Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
I hate threads that start like that. Did my spring maintenance on the 68. Change fluids, lube,adjust valves and primary chain. About a mile into the maiden voyage something went SCHREEEEECH for maybe a second. Bike still runs and idles, but between about 2,000 and 3,000 rpm there is a terrible metal on metal rattle. Sounded like something in the headlight or a coil banging on the gas tank. No such luck. Checked all the work I had just done. Not my fault it seems. I have 100/105 lbs cold compression, kind of afraid to run it till it's hot to check again. Too hot to be in the garage in the PM. 100/106 and work starts in the AM again tomorrow. Need to get a few ideas on what to look for so I know what I'll be doing next weekend. Thanks.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
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Re: What's that noise? [Re: desco] #699603
06/25/17 11:50 pm
06/25/17 11:50 pm
Joined: Jun 2007
Posts: 5,996
Maui Hawaii
HawaiianTiger Offline
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HawaiianTiger  Offline
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Joined: Jun 2007
Posts: 5,996
Maui Hawaii
Yep, my money is on a partial seizure. You'll be doing at least a top end job unless molten metal has found it's way into the crankcase. Then my recommendation is a total strip and clean out.
I tried doing it the easy way once. Lasted about 100 miles before the bottom end went.

Don't run it now.

Sorry bout that, but sh*t happens....to us all eventually.

Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: What's that noise? [Re: desco] #699606
06/26/17 12:08 am
06/26/17 12:08 am
Joined: Aug 2010
Posts: 588
Toronto, Canada
B
Bola Offline
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Bola  Offline
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Joined: Aug 2010
Posts: 588
Toronto, Canada
Did you actually open the primary cover or simply adjust the chain. I'd start there. If the bike was running fine before maintenance a seizure sounds a bit harsh.

Re: What's that noise? [Re: desco] #699614
06/26/17 1:06 am
06/26/17 1:06 am
Joined: Aug 2001
Posts: 7,144
Vermont
Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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Joined: Aug 2001
Posts: 7,144
Vermont
Possible blown head gasket ?


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: What's that noise? [Re: desco] #699624
06/26/17 3:43 am
06/26/17 3:43 am
Joined: Jun 2007
Posts: 5,996
Maui Hawaii
HawaiianTiger Offline
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HawaiianTiger  Offline
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Joined: Jun 2007
Posts: 5,996
Maui Hawaii
Many seizures happen right as the bike warms up. The pistons are expanded before the cylinder catches up. It's the most critical time. I think more seizures happen in colder weather as the cylinder stays cooler longer.
I can't think of anything else that would explain the screeching sound that didn't last long.
If the head gasket blew, wouldn't the sound not go away?
But keep us informed what you find. I love a good mystery.
Cheers,
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: What's that noise? [Re: Bola] #699643
06/26/17 10:29 am
06/26/17 10:29 am
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Offline OP
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desco  Offline OP
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Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
Bola, Pulled the primary to clean the goo out of everything. Took the clutch apart too. One of the first things I re- looked at was the chain tension. All is well.

HT, I've had several seizures. Most went away by letting the motor cool then rocking the bike back and forth in gear to free the piston. This time the motor never stopped. What's got me concerned is the loud clatter. If it was full time it would be a tear down, but it's only part time and the bike runs well. I too like a good mystery but not in MY garage and not at 105 degrees.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: What's that noise? [Re: desco] #699671
06/26/17 4:30 pm
06/26/17 4:30 pm
Joined: Oct 2009
Posts: 284
Diamond Springs, Kalifornia
Buckshot1 Offline

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Buckshot1  Offline

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Joined: Oct 2009
Posts: 284
Diamond Springs, Kalifornia
Exhaust spigots tight?


Michael

currently owned by a 72 T120R
maker of plunger conversion jig
Re: What's that noise? [Re: desco] #699677
06/26/17 5:00 pm
06/26/17 5:00 pm
Joined: Aug 2010
Posts: 588
Toronto, Canada
B
Bola Offline
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Bola  Offline
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B

Joined: Aug 2010
Posts: 588
Toronto, Canada
Broken valve spring. I once had the smaller inside spring break. Still ran but noisy only some of the time.

Re: What's that noise? [Re: Bola] #699696
06/26/17 7:20 pm
06/26/17 7:20 pm
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Offline OP
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desco  Offline OP
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D

Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
I've checked all the easy to get to stuff. I can pull the top end in a couple of hours on a Sat. morning. At least I can quit wondering what's wrong. Putting it back together might have to wait till late fall. Old faithful is still a rider.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: What's that noise? [Re: desco] #699874
06/28/17 1:02 am
06/28/17 1:02 am
Joined: Oct 2003
Posts: 11,265
North Georgia, USA
RF Whatley Offline
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RF Whatley  Offline
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Joined: Oct 2003
Posts: 11,265
North Georgia, USA
Originally Posted by desco
I have 100/105 lbs cold compression.....


Way low, or you didn't do it correctly.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: What's that noise? [Re: desco] #700480
07/02/17 5:23 pm
07/02/17 5:23 pm
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Offline OP
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desco  Offline OP
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Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
Well, it's apart. Nothing obvious on the clatter but it could use some rings. Head gasket is oily as is the combustion chamber. Filled the chambers with acetone. No leaks at the seats. Lunch time.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: What's that noise? [Re: desco] #700517
07/02/17 11:06 pm
07/02/17 11:06 pm
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Offline OP
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desco  Offline OP
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D

Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
Last time I pulled the head off the 72 one of the top rings was in 5 pieces. God only knows how long it was like that but it ran great. I've got a top ring from the 68. It's got an almost microscopic, jagged raised edge on the top and bottom of the cylinder side. Cylinders look like mirrors. I'll try and see if F and G is open tomorrow. Still curious about the intermittent rattle. Any ideas on things I can push or pull on to check?


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.

Moderated by  John Healy 


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