1980 GL1100 valve contacted piston


Information and questions on GL1100 Goldwings (1980-1983)
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dmshanks
Posts: 3
Joined: Sat Oct 12, 2013 10:52 pm
Location: Salt Lake City, Utah
Motorcycle: 1980 GL1100I

1980 GL1100 valve contacted piston

Postby dmshanks » Sun Oct 27, 2013 6:42 pm



Greetings. My brother and I had a little issue replacing the timing belts and had the camshaft pulleys move while installing the new belts. I know this is not good and the valves may contact pistons if timing is off. I did not (until after the mistake) know that one need simply turn the timing wheel until T1 is aligned and cylinder one is at TDC before proceeding with the belt change out. This gives one the necessary "home base".Had I done that before starting the job, I would be happy right now. So to check that the belts were installed with the valve train in correct order, I slowly and gently turned the stator bolt and got most of the way through a complete revolution before coming to a stop. Bad thing: I then pushed a little harder on the wrench to see if I had simply reached a sticky point. Not real hard, but maybe with 25 inch pounds of torque. Still no budging. Long story longer, I ended up bumping a piston into a valve two additional times (gently as I was anticipating the piston coming up against a valve ) before realizing I really didn't know what I was doing. I've read know that if there is even the slightest contact, to pull the heads and expect valve damage. Other's have said that a little "bump" is probably ok. What is the recommendation generally for this kind of error? A simple maintenance task has turned into a nightmare for my brother and I.
And if the recommendation is to pull the heads for a valve inspection, what do I look for and how do I make the measurements to determine if damage has indeed been done to components? Thanks!


Last edited by dmshanks on Sun Oct 27, 2013 7:08 pm, edited 1 time in total.

User avatar
SteveB123
Posts: 842
Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: 1980 GL1100 valve contacted piston

Postby SteveB123 » Sun Oct 27, 2013 7:00 pm

Damage generally occurs in a running engine, with the valve going through the piston, not just by wrenching it over until it hits and stops.

Time the cams correctly, and carry on.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

User avatar
RBGERSON
Posts: 2625
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: 1980 GL1100 valve contacted piston

Postby RBGERSON » Mon Oct 28, 2013 8:32 am

+1 just them correctly and ride you should be OK
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

dmshanks
Posts: 3
Joined: Sat Oct 12, 2013 10:52 pm
Location: Salt Lake City, Utah
Motorcycle: 1980 GL1100I

Re: 1980 GL1100 valve contacted piston

Postby dmshanks » Mon Oct 28, 2013 8:34 am

Thank you for your responses. I was kind of thinking that myself. I needed confirmation. After searching around the web a bit, others have made similar comments to yours regarding this issue. Enjoy the week.

Dave

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moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: 1980 GL1100 valve contacted piston

Postby moffat » Tue Nov 05, 2013 8:29 am

Turning over with just the starter motor will cause valve stem damage if the valve hits the piston. However it sound like you have been gentle with the wrench so give it a go and try it out. If a valve is not seating this will show in a compression test assuming the rings and bores are OK.




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