AWSpoofwil Posted December 24, 2012 Report Share Posted December 24, 2012 So my l20b in my 1978 620 KC, the first and last cylinders are smashing up the coresponding spark plugs.. what's wrong with it?! Quote Link to comment
MikeRL411 Posted December 24, 2012 Report Share Posted December 24, 2012 Wrong too long plug type? Pistons installed 180 degrees out? Quote Link to comment
ggzilla Posted December 24, 2012 Report Share Posted December 24, 2012 Either that or it has the wrong head for the engine block. 2 & 3 will get smashed up if you index the plugs. Quote Link to comment
datzenmike Posted December 24, 2012 Report Share Posted December 24, 2012 Wrong plugs. L20B's take NGK BP6ES or BPR6ES The E is the thread reach into the cylinder. E represents 19mm or 3/4". All L series 4 cylinders use E so there's no way the piston can touch them no mater what head you have. Quote Link to comment
AWSpoofwil Posted December 24, 2012 Author Report Share Posted December 24, 2012 Ok thank you! The plugs were the problem, but there's still an issue of the 4th cylinder (the one closest to the firewall) not working. Instead is had a dull ping/click sound that keeps up with the rpm..?? Quote Link to comment
datzenmike Posted December 25, 2012 Report Share Posted December 25, 2012 Pull the valve cover off and inspect the top of the valve springs where the rocker arms sit against the lash pads. Sometimes the lash pad can slip out and then the rocker has too much clearance and hits the valve retainer. Easy enough to pry down on the rocker and slip it back in. Or the valve clearance may just be to wide and it's loud. In either case check the valve clearance. 1 Quote Link to comment
ggzilla Posted December 25, 2012 Report Share Posted December 25, 2012 Always check the basics, is the lesson learned here. I just assumed anyone with this problem would have checked to see that the right plugs were installed. So Mike, why did plugs 2&3 work OK? Quote Link to comment
AWSpoofwil Posted December 25, 2012 Author Report Share Posted December 25, 2012 Pull the valve cover off and inspect the top of the valve springs where the rocker arms sit against the lash pads. Sometimes the lash pad can slip out and then the rocker has too much clearance and hits the valve retainer. Easy enough to pry down on the rocker and slip it back in. Or the valve clearance may just be to wide and it's loud. In either case check the valve clearance. thank you mike!! Quote Link to comment
datzenmike Posted December 25, 2012 Report Share Posted December 25, 2012 Always check the basics, is the lesson learned here. I just assumed anyone with this problem would have checked to see that the right plugs were installed. So Mike, why did plugs 2&3 work OK? Beats me, David. Maybe only 1 and 4 were the wrong plugs? :lol: :lol: Quote Link to comment
AWSpoofwil Posted December 25, 2012 Author Report Share Posted December 25, 2012 Nah I swapped all the plugs out and they were all the same kind.. lol Idk Quote Link to comment
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