Finished Rebuild - Bent Valve???


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figdog
Posts: 20
Joined: Tue Mar 08, 2011 12:12 pm
Location: modesto, ca
Motorcycle: 1983 aspencade

Finished Rebuild - Bent Valve???

Postby figdog » Wed Jul 09, 2014 12:35 am



So I finished the rebuild of my 83 which included a timing belt change. When I changed the timing belt, the right hand cam pulley was under pressure and lashed clockwise when the belt was taken off despite my holding it ... I didn't realize how much pressure this was under. The step by step guide on the other forum mentioned that this would happen, but didn't say anything bad would result. I lined up all marks, cranked by hand, and everything seemed fine.

Then today a mechanic who works on goldwings said that if the cam pulley shifts when you take the belt off, the sudden shift usually bends the valves!!! Is this common?? I ran a compression test on all four cylinders and they each kicked up to just past 160 (my guage doesn't hold air well, so once a max is reached, the needle dials back - I can hear the air seeping from the air release valve so its not air seeping from the engine - the compression dial usually stabilizes around 145).

the mechanic also said it should be pretty obvious audibly if the valves are bent, but my wing has always been noisy. I am uploading a video of the engine running ... let me know if anything sounds awful.

thoughts?



figdog
Posts: 20
Joined: Tue Mar 08, 2011 12:12 pm
Location: modesto, ca
Motorcycle: 1983 aspencade

Re: Finished Rebuild - Bent Valve???

Postby figdog » Wed Jul 09, 2014 12:40 am

cant upload the video ... so just comment on what I wrote .. thanks in advance

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SteveB123
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Re: Finished Rebuild - Bent Valve???

Postby SteveB123 » Wed Jul 09, 2014 6:31 am

figdog wrote:Then today a mechanic who works on goldwings said that if the cam pulley shifts when you take the belt off, the sudden shift usually bends the valves!!! Is this common??


Proving that just because you work on something, doesn't mean you know what you're talking about.

Since virtually everyone who has taken a timing belt off has had the right side cam shift, that would mean a shed load of bent valves.
And there isn't.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

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dingdong
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Re: Finished Rebuild - Bent Valve???

Postby dingdong » Wed Jul 09, 2014 6:51 am

All mechanics aren't created equal. Your engine is fine, actually better than fine if you have 160 compression on all 4 cylinders.
Tom

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redial
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Re: Finished Rebuild - Bent Valve???

Postby redial » Wed Jul 09, 2014 8:16 pm

To load a video, follow this chain:
1. jOIN YouTube;
2. Post your video to YouTube;
3. Make a note of the YouTube reference/URL;
4. Copy the URL into your message;
5. Watch the video on GWDocs, as a preview to make sure it works; and,
6. When happy with the video, release it into the forum.

You do not have to use YouTube, but that is an easy one to use, but some of the others are just as easy. It just becomes a preference.
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Re: Finished Rebuild - Bent Valve???

Postby Old Fogey » Wed Jul 09, 2014 9:27 pm

SteveB123 wrote:
figdog wrote:Then today a mechanic who works on goldwings said that if the cam pulley shifts when you take the belt off, the sudden shift usually bends the valves!!! Is this common??


Proving that just because you work on something, doesn't mean you know what you're talking about.


Yup! That there is the reason that no-one, but no-one, gets to go near my bikes! Especially 'mechanics that work on Goldwings' :twisted:

There is likely to be absolutely nothing wrong with your bike. Goldwing engines are smooth but they are not the quietest engines around.


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