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05-18-2019, 12:48 PM | #1 |
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Join Date: Mar 2015
Location: Greenville, SC
Posts: 1,099
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Center main bearing
Pulled the pan for a look around and found the center main Plastigaged out to .0025 with no shims left. What would you do? Polish the cap and try again, flat plan the cap on glass, machine shop down a tad or put it together and let it go if the others are better or no worse?
John |
05-18-2019, 02:38 PM | #2 |
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Location: Alabama
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Re: Center main bearing
I would flat plane the cap with fine sandpaper on glass .
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05-18-2019, 03:25 PM | #3 | |
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Location: Eastern Tennessee
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Re: Center main bearing
Quote:
Geez John, that's kind of a loaded question. If you are out of shims on that one, what are the other caps showing clearance-wise, and how many shims on those? I would suspect the babbitt has been "beat" out of the center main, and if so your time is going to be limited. Caps that are filed are not the best for future rebuilds as the amount of babbitt that can be cast will be less on those. |
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05-18-2019, 03:30 PM | #4 |
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Location: Between Seattle & Tacoma
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Re: Center main bearing
If it’s this worn, you might do some checking on your rear thrust,to make sure it’s in spec, and it’s not cracked. If you plan on driving much, you really need to consider a rebuild, as I’m guessing you have a cylinder ridge and your valves are sunk and almost a sharp edge. In other words, they engine is tired and worn out.
Our Dr day team has done this bearing cap trick and it worked. A few hundred miles further and a piston broke. ( old piston, new rings.). Good luck |
05-18-2019, 04:31 PM | #5 |
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Location: Melbourne, Australia
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Re: Center main bearing
Only 0.025 ! Heck, I just took 0.005out of each main bearing (shims) to get back to a decent clearance!
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05-18-2019, 06:33 PM | #6 |
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Re: Center main bearing
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05-19-2019, 06:26 AM | #7 |
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Location: Largo Florida
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Re: Center main bearing
Do you have a micrometer ? If you decide to use a piece of glass and emery cloth on the cap then I'd recommend measuring in several spots first and as you sand. Its not much, .001" will do it. Have you checked the rear yet ?
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05-19-2019, 04:44 PM | #8 | |
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Location: Greenville, SC
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Re: Center main bearing
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John |
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