Don't have experience with your model of engine, but can tell you that if the tubes are not open at both ends, in otherwords they are in the shape of a U at the opposite end you removed, then hammer plugs into the 2 holes for the tubes that are leaking. I was unable to pull my core as it either seized in or was a press fit from factory. Mine did not have the U tubes described above. My exchanger had straight tubes abd the opposite end had a simple divider for flow direction. I was unable to reattach the crimped end and finally replaced the exchanger with a used unit. In theory you should be able somehow to locate the cracked tube and maybe push a loose rubber bung toward the opposite end then fill the tube with JB weld or slow set epoxy. Just a thought... hadn't tried it myself, but would have been my next step. Good luck.