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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2002 Posts: 175 Member | | Member Joined: Jan 2002 Posts: 175 | Worked on unsticking a heat riser valve over the weekend. Successfully, I think. It is still a little sticky at the full open and full closed positions. My question is this: Are the holes in the manifold for the shaft bushed. It appears that on the end away from the counterweight that a bushing is still frozen to the shaft and is turning in the hole while on the other end the shaft seems to be freely turning in the bushing. The valve is welded to the rod. Should I attempt to get this apart? Are bushings available to re-bush this? Appreciate any reply | | | | | Joined: Jan 2000 Posts: 125 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 125 | I have taken the valve out before to free it up. I ground the welds with rotary file, pulled the flap off and removed the shaft to clean up the holes. I don't remember there being bushings, but my memory sometimes lets me down. Of course you need a welder to put it back together.
Grant
1950 Chevy 3100
1952 GMC 150 (In Pieces)
1968 Chevy K20
1966 Shovelhead
1978 BMW 100S
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#9699 09/17/2002 12:28 AM | Joined: Mar 2001 Posts: 384 Shop Shark | | Shop Shark Joined: Mar 2001 Posts: 384 | Somebody makes a lube for these risers--I think you get it at NAPA--as I recall it has graphite in it. 
Buzz'n Half Dozen
| | | | | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | No bushings unless someone added them.
Fred
52 3600
69 C-10
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