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Author
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Topic: Rod side clearance
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F-150Moneypit
Journeyman Posts: 34
From: Oregon
Registered: Jul 2003
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posted 07-29-2003 09:03 PM
  
How much rod side clearance should I have? Pulled the pan to inspect the lower end on my '90 5.0.
There is no metal in the pan, the pickup tube screen is clean. The only thing that jumps out at me is the rod side clearance. I can move the rods side to side, but not up and down. This tells me the bearings are okay but not too sure about the rod side cleance. Should I be able to sllde the rods on the journals at all. It's not much but makes me curious. If it were excessive would it make a knock only after it warms up, or would it knock even when it is cold. I would think it would knock all the time but need to be sure. Thanks!
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MLariviere
Moderator Posts: 3984
From: Biddeford,Me.USA
Registered: May 99
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posted 07-29-2003 10:22 PM
There is an assembly tolerance,maybe .010 +/-. Not sure what it is. I would think if it was excessive,it would be louder on a cold start. The tolerances usuallyu stay in on automatics,since there is not much{if any} end thrust,like a manual tranny has.
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F-150Moneypit
Journeyman Posts: 34
From: Oregon
Registered: Jul 2003
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posted 07-29-2003 10:42 PM
Good, thanks, looks like I can button it up now.which oil pump would you suggest?
standard
high volume
high pressure/high volume The oil pressure was good, but not sure what kind the old pump is and I want to replace it since I have it opened up. By the way I think the noise I was hearing may be from the valve springs. The motor got pretty hot just before the cam swap because the water pump blew out and the gauge didn't show anything wrong. I didn't change them when I swapped cams (I should have known better). That would also explain the why the noise and the running of it after it warms up. So I will swap out the springs as soon as I get this buttoned up. Thanks again!
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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 07-29-2003 11:54 PM
If you're not doing anything severe with the motor a stock pump should be just fine. When I rebuilt a 1971 351C for my 1966 F-100 I asked the machine shop (which builds race motors) and they said I didn't need a high pressure or high volume pump, even with my planned 1/8 mile drag excursions.Tracy
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F-150Moneypit
Journeyman Posts: 34
From: Oregon
Registered: Jul 2003
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posted 07-30-2003 12:31 AM
Okay good, the're about 1/2 the price too.
Thanks!
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 07-30-2003 07:54 PM
Standard = 0.010" to 0.020"
Service Limit = 0.023"
Optimal = 0.015"------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, and FordRamAir.com
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F-150Moneypit
Journeyman Posts: 34
From: Oregon
Registered: Jul 2003
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posted 07-31-2003 05:42 PM
The good news is I have .013 on all. Also found that the rods must be able to slide on the journal. So my bottem end is good to go.Have a Clevite standard oil pump, heavy duty Melling shaft and a pump primer on order. Going to get a one piece pan gasket at Napa. Guess that leaves the valve springs or rocker geometry. I can deal with that. Thanks a million!
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 07-31-2003 07:40 PM
Cool, good luck!Don't forget the possibility of a noisy injector. A friend had one get noisy on his car a while ago and it took him a while to find it. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, and FordRamAir.com
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MLariviere
Moderator Posts: 3984
From: Biddeford,Me.USA
Registered: May 99
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posted 07-31-2003 10:35 PM
While waiting for your parts,I'd put the pan back on with a few bolts,just to keep everything clean.
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F-150Moneypit
Journeyman Posts: 34
From: Oregon
Registered: Jul 2003
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posted 08-01-2003 12:06 AM
Thanks guys. The pan is on there for now. I'll definitely check those injectors!
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