loss compression after replacing valve springs


Information and questions on GL1200 Goldwings (1984-1987)
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danhamner
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loss compression after replacing valve springs

Postby danhamner » Wed Dec 26, 2012 8:57 pm



i replaced two broken intake valve springs on a 1200. pulled head and checked valves. they are good. but after installing and cranking engine, i do not have any compression on #1 and #3. pulled head again and appears intake valves wont close all the way, no matter where cam position is. any help appreciated>



bustedwing
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Re: loss compression after replacing valve springs

Postby bustedwing » Thu Dec 27, 2012 7:31 pm

Then the valve stem might be bent. The only way to find out is to pull the head off, pull the valve springs off and push the valve out of the head. If in doubt take to a machine shop , have them center it in a lathe, if it is bent it will show up right away. Then the question is, why? And usually a bad timing belt will cause such an internal damage problem. But let us know how it works out for you.
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SteveB123
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Re: loss compression after replacing valve springs

Postby SteveB123 » Thu Dec 27, 2012 8:23 pm

Valve clearance is checked OK?
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RoadRogue
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Re: loss compression after replacing valve springs

Postby RoadRogue » Fri Dec 28, 2012 1:15 am

When you had the valves out did you lap them to clean them up? Is there a chance you mixed them up and put them back in the wrong hole? 8-)
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mauricel 1939 #2913
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Re: loss compression after replacing valve springs

Postby mauricel 1939 #2913 » Fri Dec 28, 2012 1:40 am

It could be that the valves you bought were for a differfnt motor and are to long. Also when you put new valves into a head they have to be lapped in to make a good seet to the valve seet in the head. I would get the old valves and measyre the stem length to see if they are the same size.Also it might be a good idea to check the timing to see if the belts are where they are supposed to be. I would crank the engine over by HAND from the back of the clutch so you won't bend anything.

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RoadRogue
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Re: loss compression after replacing valve springs

Postby RoadRogue » Fri Dec 28, 2012 2:00 am

Did you measure the free length of the new springs before installing them? 8-)
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Re: loss compression after replacing valve springs

Postby sparrowhawwk » Fri Dec 28, 2012 10:21 pm

danhamner wrote:i replaced two broken intake valve springs on a 1200. pulled head and checked valves. they are good. but after installing and cranking engine, i do not have any compression on #1 and #3. pulled head again and appears intake valves wont close all the way, no matter where cam position is. any help appreciated>


Just learned about this today. Apparently both the 1200's and 1500's have virtually no oil pressure at cranking speed. If you take off the rocker covers you will see two "square" covers on each side. You will also notice your valves are not moving. Remove the covers and fill with oil. Spin it over until the oil goes down and refill. Do this until you see the valves start to move again. Do both sides at the same time. Then button up and start your engine.




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