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| Crankshaft Bearings, which size? Junkyard Motor....the saga continues https://slantsix.org/forum/viewtopic.php?t=62708 |
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| Author: | 62alumblock [ Mon Aug 13, 2018 9:59 am ] |
| Post subject: | Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
So, the junkyard engine had a bad crankshaft bearing. The auto parts store says there are several options, how do I know which size I need? Thanks again and again! |
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| Author: | Jase [ Mon Aug 13, 2018 10:05 am ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
Crankshaft main bearing or connecting rod bearing?? Both come in standard, and oversized (where the crank gets machined to renew the surfaces, and a larger (thicker) main or connecting rod bearing is used to fill the space.. More importantly at this moment WHY do you believe the crank needs new bearings... I ask because usually tho not always, that condition suggests there is more extensive work needed... Pictures may help at this point, to identify a course of action that is required... |
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| Author: | 62alumblock [ Mon Aug 13, 2018 10:15 am ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
One of nuts that held the bearing cap on came off, making it very loose, grinding off a side of the bearing. The nut was floating free in the oil pan. The other bearings look ok. [img]<a%20href="https://imgur.com/gRmvX6q"><img%20src="https://i.imgur.com/gRmvX6qm.jpg"%20title="source:%20imgur.com"%20/></a>[/img] |
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| Author: | 62alumblock [ Mon Aug 13, 2018 10:16 am ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
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| Author: | Reed [ Mon Aug 13, 2018 11:08 am ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
What does the crankshaft bearing journal surface look like? If the cap looks that bad you may need to have the crank ground. |
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| Author: | Dart270 [ Mon Aug 13, 2018 12:06 pm ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
That is a connecting rod bearing. Most likely you will need a new/different con rod, or at least get that one resized and have new bolts put in it. Do not skimp on this or you will not have a long living motor. Reed is right you need to carefully check the crank rod journal too. Lou |
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| Author: | Doctor Dodge [ Tue Aug 14, 2018 7:54 am ] |
| Post subject: | Re: Crankshaft Bearings, which size? Junkyard Motor....the saga continues |
It looks like a later cast crankshaft bearing... Is the oil spurt hole near the center of the bearing and is the bearing insert just under 1 inch wide? DD |
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