| carcrazy | -- 08-26-2012 @ 8:34 AM |
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What is the best way to ensure that the rod bearings will be fully floating in both of the rods on the same journal? While assembling my pre-48 engine it seems that I can get the bearing to be full floating in either one of the two rods but not both at the same time. What is wrong? Please advise. Thank you.
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| TomO | -- 08-26-2012 @ 11:17 AM |
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Both rod openings on a journal should be the same size. The also must be round. You cannot re-size the opening by filing or grinding the mating surfaces, you must align bore both rods for a journal at the same time. Tom
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| supereal | -- 08-26-2012 @ 11:42 AM |
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Check the diameter of the connecting rod bore. The 85 and 90 HP engines should measure 2.2195 to 2.2200. For the 95-100 HP, the bores should be 2.3597 to 2.3603 inches. Check all crankshaft rod journals to be sure they are the same size. Some reground cranks may have a non-standard journal mixed with standards. The clearance between the crank and insert bearing, and the bearing and the rod should be .0015 and .0035. The use of PlastiGage to check all clearances is recommended, with the rod caps torqued to spec. With castellated nuts, 35-40 ft pounds. Self locking nuts, 40-45 ft lbs. The clearance between the two rods on one journal is .006 to .014. Any less will prevent the bearing from floating. Successfully assembling an engine depends on skill and having the proper tools. When in doubt. seek assistance from a shop that has experience. This message was edited by supereal on 8-26-12 @ 11:44 AM
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| carcrazy | -- 08-26-2012 @ 12:43 PM |
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Tom and Super, Thank you. I will check all of the clearances and take appropriate actions to get the bearings to rotate freely.
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