Timing Belts
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- gapl1953
- Zinc Member
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- Joined: Wed Mar 17, 2010 10:55 am
- Location: springbrook wisconsin
Timing Belts
I had a unusual timing belt issue. After revving to the red line, on my 1979 GL1000, and backing off I blew a timing belt. The belts had only about 1500 miles on them so I was perturbed. When I disassembled the timing belt covers, I found that the left belt had come off and was wedged in the front of the right side pulley. It was wedged so tight between the pulley and the front cover that it blew the cover forward 1/8 of a inch. I could not get the cover off until I used a slide hammer to pull out the right belt from in front of the pulley. It was in perfect condition. The left belt was broken. I was lucky, no piston damage, 3 bent valves. It appears that the left belt slingshot to the right jammed up the right pulley and broke the right belt when it stopped.
Current Stable; 1979 GL1000, 1973 CB500K1, 1973 CB750K3, 1985 CB700SC, 1984 BMW R80RT,
1996 Buell S-2 Thunderbolt
My father use to say, "Anyone can fix it with the right tools"!
I say, "If it don't fit, get a bigger hammer"!
1996 Buell S-2 Thunderbolt
My father use to say, "Anyone can fix it with the right tools"!
I say, "If it don't fit, get a bigger hammer"!
- Rat
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Re: Timing Belts
gapl1953 wrote:I had a unusual timing belt issue. After revving to the red line, on my 1979 GL1000, and backing off I blew a timing belt. The belts had only about 1500 miles on them so I was perturbed. When I disassembled the timing belt covers, I found that the left belt had come off and was wedged in the front of the right side pulley. It was wedged so tight between the pulley and the front cover that it blew the cover forward 1/8 of a inch. I could not get the cover off until I used a slide hammer to pull out the right belt from in front of the pulley. It was in perfect condition. The left belt was broken. I was lucky, no piston damage, 3 bent valves. It appears that the left belt slingshot to the right jammed up the right pulley and broke the right belt when it stopped.
Yikes ... where did you get those belts.
Gord
"I'd rather Ride than Shine"
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
- Cookie
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Re: Timing Belts
Eeek! I'd wonder is an adjuster is bad or it is slightly out of alignment?
Enjoy life,
Cookie
A guy with two sidecars can't be all bad.
Owner of 4.4 76s and one lone 75 Wings (does a spare engine make .2?)
Cookie
A guy with two sidecars can't be all bad.
Owner of 4.4 76s and one lone 75 Wings (does a spare engine make .2?)
- ericheath
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Re: Timing Belts
Yikes!! I replaced mine yesterday. I hope they're good. What kind did you put on and where did you get them?
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
- gapl1953
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- Location: springbrook wisconsin
Re: Timing Belts
They were the NAPA brand.
I don't see how they can get misaligned. I think they developed a wave in them, with the acceleration and deceleration. That caused the left one to jump the pulley. Or maybe the one belt's compound was defective causing it to stretch. I don't know. I was hoping someone else would have some insight.
I don't see how they can get misaligned. I think they developed a wave in them, with the acceleration and deceleration. That caused the left one to jump the pulley. Or maybe the one belt's compound was defective causing it to stretch. I don't know. I was hoping someone else would have some insight.
Current Stable; 1979 GL1000, 1973 CB500K1, 1973 CB750K3, 1985 CB700SC, 1984 BMW R80RT,
1996 Buell S-2 Thunderbolt
My father use to say, "Anyone can fix it with the right tools"!
I say, "If it don't fit, get a bigger hammer"!
1996 Buell S-2 Thunderbolt
My father use to say, "Anyone can fix it with the right tools"!
I say, "If it don't fit, get a bigger hammer"!
- Roady
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Re: Timing Belts
Moved to Tech Discussions.
Were you just free-revving it? No load, or was that on the go?
I don't think I've ever revved an engine to redline when I wasn't going somewhere.
Were you just free-revving it? No load, or was that on the go?
I don't think I've ever revved an engine to redline when I wasn't going somewhere.
- wilf
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- Location: saskatoon
Re: Timing Belts
seems to me randdakk had belts blow out on one of his bikes not to long ago.
I'm planning on staying well below redline with my napa belts
Wilf
I'm planning on staying well below redline with my napa belts
Wilf
79 naked wing - not so naked anymore
80 interstate project very naked now
90 1500 heartbreaker
80 interstate project very naked now
90 1500 heartbreaker
- mtclimited
- Titanium Member
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- Location: Big Spring Texas
Re: Timing Belts
I am not downing NAPA by any means, but they are not what they use to be anymore.
My local NAPA didn't even have a way to look up the belts for a GL1000. They said the part was not available. I then gave them the part number. Then it came up. They had one at one location and the other half way across the country.
Then they told me that the cost would be higher because they would have to charge freight on one of them.
I asked about the date (I was looking at the screen with them) that was listed next to the part. The guy told me it was the date it was entered into that location. It was 2001. So one of the belts had been sitting in the whse for 9 years.
Go figure.
My local NAPA didn't even have a way to look up the belts for a GL1000. They said the part was not available. I then gave them the part number. Then it came up. They had one at one location and the other half way across the country.
Then they told me that the cost would be higher because they would have to charge freight on one of them.
I asked about the date (I was looking at the screen with them) that was listed next to the part. The guy told me it was the date it was entered into that location. It was 2001. So one of the belts had been sitting in the whse for 9 years.
Go figure.
I thought I knew everything when I was 18. Now I know how stupid I really am.
1976 GL1000 LTD (restoring)
1977 GL1000 (no title running parts bike)
1984 Honda Big Red
1983 V45 Magna (repair job for a friend that needs to get out of the barn)
1978 GL1000 (parts)
Retired:
1981 Yamaha 650 Special
1984 Honda V65 Magna
1991 BMW K1
1991 Harley Softail Custom (retired by old lady in parking lot)
Various other bikes along the way.
1976 GL1000 LTD (restoring)
1977 GL1000 (no title running parts bike)
1984 Honda Big Red
1983 V45 Magna (repair job for a friend that needs to get out of the barn)
1978 GL1000 (parts)
Retired:
1981 Yamaha 650 Special
1984 Honda V65 Magna
1991 BMW K1
1991 Harley Softail Custom (retired by old lady in parking lot)
Various other bikes along the way.
- wilf
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- Location: saskatoon
Re: Timing Belts
Mine was not a shot at napa belts. Just can't see them or any other's made now been the qaulity of the factory ones back in the day.
Wilf
Wilf
79 naked wing - not so naked anymore
80 interstate project very naked now
90 1500 heartbreaker
80 interstate project very naked now
90 1500 heartbreaker
- mtclimited
- Titanium Member
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- Location: Big Spring Texas
Re: Timing Belts
didn't mean you. I was talking about me. I love my NAPA store, but not like it was when I worked there back in the early 80's. I miss the books. Those damn computers make you stupid.wilf wrote:Mine was not a shot at napa belts. Just can't see them or any other's made now been the qaulity of the factory ones back in the day.
Wilf
I thought I knew everything when I was 18. Now I know how stupid I really am.
1976 GL1000 LTD (restoring)
1977 GL1000 (no title running parts bike)
1984 Honda Big Red
1983 V45 Magna (repair job for a friend that needs to get out of the barn)
1978 GL1000 (parts)
Retired:
1981 Yamaha 650 Special
1984 Honda V65 Magna
1991 BMW K1
1991 Harley Softail Custom (retired by old lady in parking lot)
Various other bikes along the way.
1976 GL1000 LTD (restoring)
1977 GL1000 (no title running parts bike)
1984 Honda Big Red
1983 V45 Magna (repair job for a friend that needs to get out of the barn)
1978 GL1000 (parts)
Retired:
1981 Yamaha 650 Special
1984 Honda V65 Magna
1991 BMW K1
1991 Harley Softail Custom (retired by old lady in parking lot)
Various other bikes along the way.
- Cookie
- Honored Life Member
- Posts: 15821
- Joined: Thu Oct 25, 2007 11:37 pm
- RIP: 1950-2011
- Location: San Mateo, CA
Re: Timing Belts
The way it happened on the unwind I'd wonder if the difficult belt was a bit loose.
Enjoy life,
Cookie
A guy with two sidecars can't be all bad.
Owner of 4.4 76s and one lone 75 Wings (does a spare engine make .2?)
Cookie
A guy with two sidecars can't be all bad.
Owner of 4.4 76s and one lone 75 Wings (does a spare engine make .2?)
- Whiskerfish
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Re: Timing Belts
My first impression would be a tensioner problem or improper tension when installed as Cookie mentioned. I have reved every GL I own to redline and beyond numerous times without incident.
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
"Yea I do dance awkwardly, and I am having more fun than you" Taylor Swift
2008 GL1800 IIIA "TH3DOG"
1984 GL1200 Standard
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
Psst. oh and by the way CHANGE YOUR BELTS!!!!
"The book is wrong, this whole Conclusion is Fallacious" River Tam
"Yea I do dance awkwardly, and I am having more fun than you" Taylor Swift
2008 GL1800 IIIA "TH3DOG"
1984 GL1200 Standard
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
Psst. oh and by the way CHANGE YOUR BELTS!!!!
- Sagebrush
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Re: Timing Belts
My first thought was tensioner as well. These belts do need some tension on them, perhaps your tensioner spring was weak when you installed the belt and left it loose? Hard to say after the fact I know but certainly a possibility.
Dean Spalding
Raleigh, NC
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein
'82 Yellow GL1100
'81 Blue GL1100
My Gallery
My 1100 Build Thread
Raleigh, NC
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." - Albert Einstein
'82 Yellow GL1100
'81 Blue GL1100
My Gallery
My 1100 Build Thread
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Re: Timing Belts
actually it's my understanding that Gates belts are exactingly designed, rigorously tested and obviously capable of being made of better materials than belts made 30+ years ago. I'd hesitate to fault the new belts being inferior to OEM Honda belts, even new OEMs.wilf wrote:Mine was not a shot at napa belts. Just can't see them or any other's made now been the qaulity of the factory ones back in the day.
Wilf
just my .02 worth.
sorta bulldogged custom 1978 GL1000 - "geekster"
full Vetter dress 1979 GL1000 - "Barge" (currently down)
1986 1200 Aspencade - "Heart of Gold" - daily rider
1990 1500 Aspencade - It's ALIVE! but very, very naked. not in a good way.
1978 for $100 - project in worx
1978 from a previous member here - taking up space
my original '79 bought in '91 - replacing engine (eventually, maybe someday)
H2G2=42
A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity. ~ Robert A. Heinlein
The good thing about science is that it's true whether or not you believe in it. ~ Neil deGrasse Tyson
full Vetter dress 1979 GL1000 - "Barge" (currently down)
1986 1200 Aspencade - "Heart of Gold" - daily rider
1990 1500 Aspencade - It's ALIVE! but very, very naked. not in a good way.
1978 for $100 - project in worx
1978 from a previous member here - taking up space
my original '79 bought in '91 - replacing engine (eventually, maybe someday)
H2G2=42
A competent and self-confident person is incapable of jealousy in anything. Jealousy is invariably a symptom of neurotic insecurity. ~ Robert A. Heinlein
The good thing about science is that it's true whether or not you believe in it. ~ Neil deGrasse Tyson
- morganfrmn
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Re: Timing Belts
I just bought a nice set of used belts off ebay... but I never go to the red line....
I think the bike was telling you something....
You must sense the spirit of the bike, you must be one with your bike....I dont think your
bike liked the red line thing and it was communicating it to you.
I think the bike was telling you something....
You must sense the spirit of the bike, you must be one with your bike....I dont think your
bike liked the red line thing and it was communicating it to you.
Click here and you can see my motorcycle
(http://www.ngwclub.com/gallery/main.php?g2_itemId=2743)
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(http://www.ngwclub.com/gallery/main.php?g2_itemId=2743)
(http://www.facebook.com/morganfrmn)
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