| carcrazy | -- 01-24-2012 @ 2:34 PM |
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I am assembling a V8-60 engine with the full floating rod bearings. What is the best way to measure the clearances between the crank journal and the bearing inserts and between the inserts and the rods? Will Plastigage work to accomplish this? If so, should Plastigage be placed between both clearance spaces at the same time while the rod nuts are tightened to the installed torque spec.? Please advise. Thank you.
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| supereal | -- 01-24-2012 @ 5:13 PM |
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Plastigage is not adequate for that measurement of all rods and the crank in most cases. In addition, the rods should be checked to be sure they are straight. These old engines almost always have been overhauled several times in their life, and accurate measurements are essential to assure a durable outcome. Find a good machine shop in your area to do this work. Sixty horsepower engines are at least seven decades old, and are worth the expense, as are most flatheads. With floating bearings, both the rod and crank must be measured, not only for concentricity, but for the size of the crankpins and rod opening to determine bearing size because the bearings "float" against both the crank and the rods. Finding correct bearings can be difficult if not standard or common oversize will fit. This message was edited by supereal on 1-25-12 @ 12:46 PM
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| TomO | -- 01-25-2012 @ 7:46 AM |
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Ford recommended that the rods be assembled without the bearings and then measure the inside diameter of the rod in several places to ensure that the opening is round. Some rods may have had the mating surfaces ground to fit standard bearings. These will no longer be round. I do not have the specs for the 60HP engine, but the inserts were supplied in .004" and .008" oversize to fit rods that were scored and reground. The rods should be reground in pairs and it is best to find a machine shop that has extensive flathead experience and the equipment to grind the rods in pairs. Tom
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| carcrazy | -- 01-25-2012 @ 7:35 PM |
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Thank you gentlemen. I had the machine work done at a shop that had worked on flatheads in the past but had never done a V8-60 before. They reconditioned the rods but I don't know if they ground them in pairs.
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| TomO | -- 01-26-2012 @ 7:12 AM |
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Reconditioning the rods can be defined differently by different shops. Check the large ends for an out of round condition that could occur if the rods were reconditioned like the 49-53 rods with the fixed inserts. Also this check will determine what oversize bearings that you will need. Tom
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| supereal | -- 01-26-2012 @ 11:20 AM |
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Be aware that the bearings for the 60hp are different from the larger engines, and the 37-39 bearings are different from those used in the 1940 version, which are somewhat larger. We have been able to find 60hp parts at Little Dearborn inMinnesota. (888) 282-2066
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