300 rod bearings
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300 rod bearings
[font size="1" color="#FF0000"]LAST EDITED ON 18-Jan-01 AT 09:57 AM (EST)[/font][p]my 300 six has developed a slight knock(not very loud) but i hate the engine noise. can i replace the rod bearings without regrinding the crank? the motor has about 172,000 highway miles
John Floyd
South Mills,NC
'86 F150 2wd 300 6
Crane Cam 260/272
stock manifolds, w/ staight pipe
John Floyd
South Mills,NC
'86 F150 2wd 300 6
Crane Cam 260/272
stock manifolds, w/ staight pipe
Senior User
Joined: Jan 2001
Posts: 326
Likes: 0
300 rod bearings
You can replace the bearings without regrinding the crank provide it is not scored or past its runout limit (.005" I believe). I don't kwon right off what the journal diameter is right off but manuals like Haynes have all those specs including runnout limit.
If you do need to have the crank reground it shouldn't cost that much, I had a 302 ground 10/10 and indexed for $125cdn at a local shop that builds engines for MASCAR drivers.
RCC
If you do need to have the crank reground it shouldn't cost that much, I had a 302 ground 10/10 and indexed for $125cdn at a local shop that builds engines for MASCAR drivers.
RCC
Elder User
Joined: Sep 2000
Posts: 936
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From: Bay area
300 rod bearings
Your better off having the crank regound. what willl happen is the old beagings have worn into the crank and probably have wear lines in it. replacing the bearings only is a quick cheap fix that usually will require doing it again in the future!
for the small cost have it ground down!
If it is still running. you didn't try hard enuf!
for the small cost have it ground down!
If it is still running. you didn't try hard enuf!
More Turbo
Joined: Nov 2000
Posts: 715
Likes: 11
From: Erie, PA
300 rod bearings
You should have the oil pressure checked. If it is within spec, then the bearings are good. Sometimes those engines will develop some pliston slap. Also if you do end up replacing the bearings, install a new good quality oil pump.
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