Engine Ear· Registered
Need to get a vernier or digital caliper and measure the plug hole diameter. The new plugs should be slightly oversize for a press fit. Not sure, perhaps 5 to 10 thou over. You can measure new ones in the store to confirm fit. Suppose that a proper setting tool has a shoulder to catch the block or head surface to get depth and alignment right. Maybe a big socket could be used to set them. If other undesturbed plugs are accessible, could measure their depth with the caliper depth tail. Wind tape around the socket as a visual depth indication. This should get it close. If you freeze the plugs first as earlier mentioned, they should pop in quite easily.I am not concerned about driving it home, I'll keep an eye on the gauge. I have a new thermostat to install, and I will check the cap and wiggler for function. I blame them popping out on the plugs themselves. (I could be wrong) Crap design not enough side wall. It appears you need a special tool to set them to the precise depth. I tried to locate the needed size in the traditional cap shape and at O'riley's the counter guy found them on ebay but when I got home, I could not find the same source on e-bay and no one selling them had the specs (Size) posted so I made some. Cummins never got back to Me not a big money maker, I guess..