The Ford Barn - View Single Post - backire through carburator on 1946 8 cylinder

Fordestes · 11-23-2019, 02:01 PM

Check compression, or pressure up cylinders to verify the valves are sealing properly, it is nothing unusual for the valves to stick especially if the valves are stainless steel and the guide bores are not bronze lined or maybe the stem to guide clearance is too tight, I have found some of the off shore valve guide bores to be a bit too small i.d. , yes they can run fine then the assy. lube is washed off, then after sitting a short time start to stick . check for a faulty distributor cap or moisture collecting in the dist. cap causing spark scatter. , make sure the plug wires are not shorting (especially under load) across one another.
Just because the parts are new don't mean they are not defective. always add some marvel mystery oil to the fuel to keep the valve guides lubricated and avoid future problems with sticking valves .

11-23-2019, 02:01 PM	#2
Fordestes Senior Member Join Date: May 2010 Posts: 886	Re: backire through carburator on 1946 8 cylinder Check compression, or pressure up cylinders to verify the valves are sealing properly, it is nothing unusual for the valves to stick especially if the valves are stainless steel and the guide bores are not bronze lined or maybe the stem to guide clearance is too tight, I have found some of the off shore valve guide bores to be a bit too small i.d. , yes they can run fine then the assy. lube is washed off, then after sitting a short time start to stick . check for a faulty distributor cap or moisture collecting in the dist. cap causing spark scatter. , make sure the plug wires are not shorting (especially under load) across one another. Just because the parts are new don't mean they are not defective. always add some marvel mystery oil to the fuel to keep the valve guides lubricated and avoid future problems with sticking valves .