Just bought a 66 GMC for my son. Truck runs pretty good, but has a leak at what I think is called the water pump bypass hose. It is a short rubber hose only about 3" long that goes from the top of the water pump to the intake manifold, right in the front of the engine.
It looks like you may have to pull the intake manifold off to change it. Anyone know if you could potentially change it without doing that, and also what the size of this hose is? Looks like about 1.25" or 1.5" in diameter.
Final question--to adjust the valves, from what I have read you adjust the valves "engine hot while running". Would one have the motor running, loosen the valve lash adjuster (I assume a lock nut with a slotted screwdriver threaded adjuster), put the right size feeler gauge in and tighten down until you hit the gauge. Sound about right? I can't quite comprehend doing this with the engine runnning, I would think you would do engine hot, then turn it off, then rotate by hand one cyl at a time by rotating until there was no pressure from the valve springs and setting to the gauge then...
Last edited by R-Bo; 09/02/2010 10:01 PM.
