Valve guide problems
Posted: Sat Dec 03, 2005 10:24 pm
I think I may have a problem. I was trying to install my kibblewhite valves into the stock valve guides. The exhaust valves slid right in. The intake valves didn't work out so good. When the valve is about halfway into the guide it stops. Now I can slowly turn the valve while applying light pressure and the valve will go all the way in, but once it is in place I can feel resistance when I push on the stem side of the valve.
I read the other post about valve guide sizing. So I went and borrowed a 5.5 mm valve guide reamer from my friend at the Honda shop. When I inserted the reamer into the guide I can push it all the way though and can even turn it with my fingers with little effort. Before I even inserted the reamer into the guide I looked inside both of them and did not see anything that looked like it was causing blockage.
Well after using the reamer I tried inserting the valve again, same results. So then I started troubleshooting procedures. To make sure it was not the valve causing the problem I stuck the intake valves into the exhaust ports, the valves slid right in. Next I tried inserting the exhaust valves into the intake ports they stuck just like the intake valves.
Now when I was taking the head apart I did notice that the valves were a little harder to get out than normal. Just to see what would happen I also took one of the stock valves and tried putting it back into head. It stuck also. In fact I think that it stuck harder than the kibblewhite valve did.
I looked again into the guide with a brighter light and I noticed that there were horizontal and diagonal lines in the intake valve guides. The exhaust guides were smooth like they should be. Also in the ring at the top of the stem on the intake valves there was gold gunk that I figure is valve guide.
So I am guessing that the reason the valve is getting stuck is because of the lines causing resistance.
My question is why did it do this? Why was it just the intake side? How hard is it to replace the guides?
I tried to get some pics but my camera would not focus up that close.
I read the other post about valve guide sizing. So I went and borrowed a 5.5 mm valve guide reamer from my friend at the Honda shop. When I inserted the reamer into the guide I can push it all the way though and can even turn it with my fingers with little effort. Before I even inserted the reamer into the guide I looked inside both of them and did not see anything that looked like it was causing blockage.
Well after using the reamer I tried inserting the valve again, same results. So then I started troubleshooting procedures. To make sure it was not the valve causing the problem I stuck the intake valves into the exhaust ports, the valves slid right in. Next I tried inserting the exhaust valves into the intake ports they stuck just like the intake valves.
Now when I was taking the head apart I did notice that the valves were a little harder to get out than normal. Just to see what would happen I also took one of the stock valves and tried putting it back into head. It stuck also. In fact I think that it stuck harder than the kibblewhite valve did.
I looked again into the guide with a brighter light and I noticed that there were horizontal and diagonal lines in the intake valve guides. The exhaust guides were smooth like they should be. Also in the ring at the top of the stem on the intake valves there was gold gunk that I figure is valve guide.
So I am guessing that the reason the valve is getting stuck is because of the lines causing resistance.
My question is why did it do this? Why was it just the intake side? How hard is it to replace the guides?
I tried to get some pics but my camera would not focus up that close.