Broken Timing belt with no damage


Information and questions on GL1500 Goldwings (1988-2000)
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Floattubr
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Broken Timing belt with no damage

Postby Floattubr » Mon Mar 14, 2016 2:22 pm



Is it possible for a Timing Belt to break and not cause major or any damage?
I'm looking at an 89' with 50k on it. PO says when he bought it he didn't make out of the town and a belt broke.
Towed to the dealer they replaced the belts + some small items and off he went......I'm leary.
He drove it 200+ miles from the shop then trailered it home. He's put 5 k on it since.

Should I be concerned? It runs great etc and he takes care of his equipment.

Thanks in advance, Marshall



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WingAdmin
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Re: Broken Timing belt with no damage

Postby WingAdmin » Mon Mar 14, 2016 3:28 pm

Not likely. You'd have to have all three cylinders on that side in a state where the valves were closed in all of them at the same time, and I'm pretty sure there is no cam position in which this is the case. Plus, the cam doesn't stop instantly when the belt breaks, there is a bit of momentum there, so as it was slowing down (while the engine continued on), there would be valves open when a piston came up and hit it. As soon as the piston hits the valve, it's all over, the cam stops pretty quick.

It's possible for there to be minor damage, but as for no damage - not on a 6 cylinder interference engine, no.

Floattubr
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Re: Broken Timing belt with no damage

Postby Floattubr » Mon Mar 14, 2016 3:53 pm

Thank you, WA. I know of the wonderful "interference" engines out there and what happens to them. Now the 80's Volvo overhead cams had it right....but not very economical.
So, I'll get a look at the Repair order and see exactly what they repaired/replaced.
There'd have to be too much damage for just the Belts replaced and be able to ride on, yes?
He's 83 years old so hopefully there's more repaired than he realized.

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RBGERSON
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Re: Broken Timing belt with no damage

Postby RBGERSON » Mon Mar 14, 2016 7:20 pm

Possible..yes likely no!
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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WingAdmin
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Re: Broken Timing belt with no damage

Postby WingAdmin » Tue Mar 15, 2016 11:35 am

There's a simple way to find out - have them check the compression. An engine with valve damage will not normally have good (or any) compression on the cylinders with the damaged valves.

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urbanmadness
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Re: Broken Timing belt with no damage

Postby urbanmadness » Tue Mar 15, 2016 3:09 pm

I wouldn't worry about it, if it's running well. He probably had some valves replaced as well as the belts.

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MikeB
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Re: Broken Timing belt with no damage

Postby MikeB » Tue Mar 15, 2016 5:59 pm

urbanmadness wrote:... probably ...
Is not good enough when you are looking to buy a used motorcycle. Buyer beware.
MikeB
Tacoma, WA, USA

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urbanmadness
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Re: Broken Timing belt with no damage

Postby urbanmadness » Tue Mar 15, 2016 7:47 pm

Ah but it wouldn't run well if it had bent valves. It would run with a miss on at least one cylinder. If it was missing on more then one it would be downright unfideable. The other possibility is that a tensioner let loose but didn't do damage before being shut down. In that acne you would change the belts and tensioners.

Floattubr
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Re: Broken Timing belt with no damage

Postby Floattubr » Tue Mar 15, 2016 8:32 pm

8-)
Thank you gentlemen for your words of wisdom
I'm going to go down and see it do a compression test also that should settle my case

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Re: Broken Timing belt with no damage

Postby hugger-4641 » Thu Mar 31, 2016 5:47 am

You can look up the specs in the manual to be sure, but off the top of my head, I would expect to see at least 190lbs on each cylinder, probably closer to 210 lbs on a bike with that few miles. A bike with only 50k miles should not have had a timing belt broke. I know several of these bikes that got past 100k before having a belt changed. I would be curious to see that compression test and if all cylinders weren't within 10lbs of each other, I'd plan on having valve work.

CA_Guy
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Re: Broken Timing belt with no damage

Postby CA_Guy » Sat Apr 02, 2016 10:10 pm

It was not the miles that destroyed the belt, it was the age. It would take a miracle for no damage to be done to the valves or the pistons, so my humble guess would be that he had more done to the bike than he really realized. Hopefully he has the invoice, if not, time for a compression test. It would not be running at all if he still had major damage done to the engine. Good luck - these engines are built like a fine running sewing machine. When maintained correctly, they will run a long time, but remember that the time, as well as the miles, should be considered in repairs.




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