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And.. It's good! The Frito Lay truck had about 186K on it (that was the estimate on the odometer -- it could have maybe been 86K - that would be sweet).. Anyway, about 350 psi almost across the board.. The longer I ran it, making it a little warmer, the better it got.. Went from about 330, to 350, 350, then about 350-360ish on #4.. I am only assuming the increase is because of the increased heat from turning it.. The engine is semi-disassembled (no injection pump, etc) so I was not able to start it to get it warm...
Anyway, I used a cheapo Harbor Freight compression tester.. There is a kit that is as low as $25 when on sale. It does not advertise that there is a Cummins B series tester, but sure enough there is.. I bought it, started going all around the state trying to find a matching adapter but couldn't.. Then one night, started messing around with the adapters I had, and sure enough the bottom right adapter is the right Cummins..
I don't stand to far behind Harbor Freight but it is useful for at least semi-knowing whether the engine is in good shape.. We also did a friend's Isuzu 4BD1T motor (very similar to 4BTs, from their cab over trucks).. Unfortunately has low compression in #1 cyl
Anyway, I used a cheapo Harbor Freight compression tester.. There is a kit that is as low as $25 when on sale. It does not advertise that there is a Cummins B series tester, but sure enough there is.. I bought it, started going all around the state trying to find a matching adapter but couldn't.. Then one night, started messing around with the adapters I had, and sure enough the bottom right adapter is the right Cummins..
I don't stand to far behind Harbor Freight but it is useful for at least semi-knowing whether the engine is in good shape.. We also did a friend's Isuzu 4BD1T motor (very similar to 4BTs, from their cab over trucks).. Unfortunately has low compression in #1 cyl