"azazel scratch" wrote (250 Engine)
I had my head professionally machined. Valves and springs were
removed, inspected, and cleaned. The seats were reground.
I reinstalled the head, new gasket, and rocker arm assembly.
I replaced the head bolts, rocker arm bolts and pushrods in their
original positions and torqued them in the correct sequence to
the correct torque. I installed new spark plugs, oil, and coolant.
The engine started after a few crankings but there is smoke
coming off the carburetor, manifold, head, and valve cover.
The engine sounds different and there is no power.
I didn't move the distributor but I can try adjusting the timing.
The valves are not adjustable as far as I can tell.
I've rebuilt VW engines completely with no problems.
I'm going to run a compression test on the 6 cylinders.
I have overlooked anything?
Smoke coming off the head and from nearby components (valve
cover, carb, and manifold is may be surface oil burning off from
an overheated engine. Extremely retarded ignition timing, a
too-rich fuel mixture, or burned/unseated valves will cause this.
The compression test will show if the valves are the problem.
When valve seats (and valves?) are reground there is a possibility
that the increased valve stem projection will prevent valves from
fully closing. The valve lash must be adjusted to compensate:
1.) Mechanical adjusters: Reset valve lash to specs.
2.) Hydraulic lifters w/Sphere nut: Back off nut and readjust.
3.) Hydraulic lifters No-adjust: Install perforated shims under rocker shaft