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Connecting Rod Bearing Sizing and Replacement

 
Old 03-30-2019, 05:03 AM
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Default Connecting Rod Bearing Sizing and Replacement

I have a 2002 F150 with a 4.6L Romeo engine and apparently have a spun connecting rod bearing.
How do I go about finding the correct bearing to replace it with and should I just replace all of them?

The last time I replaced bearings was about 35 years ago, in an Opel Manta, but can't remember how I figured it out, though I do recall using plastigage.
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Old 03-30-2019, 06:39 AM
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As long as you have it apart, I would plastigage the other bearings and see where you stand. Your parts guy with his resources should be able to match up the bearing you need.
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Old 03-30-2019, 08:20 AM
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There must be some way to look up the clearance and what size plastigage to use.
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Old 03-30-2019, 02:30 PM
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Better inspect the crank, because they usually get damaged when you spin a bearing. That's been my experience anyway.
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Old 03-30-2019, 02:42 PM
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If the bearing spun you will have crankshaft damage that will require machining.When ever I built an engine I would take it to a machine shop and let them machine the crank and match it with over sized bearings then bring it to my shop and put it back together.

The 4.6 engine requires some special adjustments on the crankshaft mains.
.
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Old 03-30-2019, 03:24 PM
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Originally Posted by Rnlcomp View Post
If the bearing spun you will have crankshaft damage that will require machining.When ever I built an engine I would take it to a machine shop and let them machine the crank and match it with over sized bearings then bring it to my shop and put it back together.

The 4.6 engine requires some special adjustments on the crankshaft mains.
.
Hopefully whatever damage there is will be slight. I won't bother removing the crankshaft, the engine has 220K on it.
I've seen some guys on YouTube smooth out damage without removing the crank.
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Old 03-30-2019, 04:10 PM
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Originally Posted by mplieb View Post
I've seen some guys on YouTube smooth out damage without removing the crank.
I tried it once. Worked long enough to sell it. No way would I ever trust it to go any where of distance.
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Old 03-30-2019, 04:16 PM
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Originally Posted by Rnlcomp View Post
I tried it once. Worked long enough to sell it. No way would I ever trust it to go any where of distance.
.
Wish me luck!
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