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Bearing fit ... engine oil gravity feed Just finished my engine overhaul, new modern rings, valve job, new stainless steel valves, adjustable lifters. I fitted the mains and rods at .001 or less, I use 5W-20 oil same as your newer cars.
Thicker oil at low temp' can feed very slow or almost not at all down those 3 tubes to the mains, with thinner oil there's feed right away even in sub zero temps. Same goes for tranny and rear ends with this old 600 tar, until the grinding friction heats it up you have no lube on gears at all, this is what ruined tons of old cars years ago, cold weather the thick oils is a death sentence. Run 80-90 or universal tractor fluid, both are high EP lubes. Use the modern stuff, do your car a favor. warrene |
Re: Bearing fit ... engine oil gravity feed I agree, but like more clearance, .0015 minimum.
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Re: Bearing fit ... engine oil gravity feed i am with Jim on thsi one .0015 claearance.
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Re: Bearing fit ... engine oil gravity feed What’s your piston clearance?
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Re: Bearing fit ... engine oil gravity feed The original bearings hold a lot of oil--- even years later there is enough in them to drip when taking apart ---
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Re: Bearing fit ... engine oil gravity feed I agree with nothing, in post No. 1.
Herm. |
Re: Bearing fit ... engine oil gravity feed I also agree with .0015 clearance in the bearings.
I am in Southern California and run 20/50 oil. 5/20 is way too thin when driving across the desert on a hot day. My opinion, Chris W. |
Re: Bearing fit ... engine oil gravity feed Doesn't 600W in the transmission aid in shifting as it slows the gears enough to shift. Too thin of oil and your grinding gears. Correct me if I'm wrong though
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Re: Bearing fit ... engine oil gravity feed Quote:
Thats correct. However some think that 600W is the weight of the oil. It isn't, its a designation. 600W is about 140-180 weight. |
Re: Bearing fit ... engine oil gravity feed Bearing clearance should allow crankshaft to turn at about 75 lbs-ft of torque. I do not understand the logic of using 20W50 oil becuase at 50 viscosity, the oil flow is less than a SAE 30.
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Re: Bearing fit ... engine oil gravity feed Quote:
Bearing clearance should allow the crank to turn very easy. Ring tension is a different animal. 20W50 designation is a 20 weight oil with the film strength of 50. |
Re: Bearing fit ... engine oil gravity feed I'm not an engine builder but I am a mechanical engineer so if Herm or anyone else with experience corrects me I will yield but 75ft-lb just to turn the crank seems like way too much. Maybe on a fully assembled fresh engine in the car with new rings but even then it seems like too much.
When I went down to check the progress on my engine, the rebuilder had fit the crank and could spin it by hand with relative ease. Snug would be the word to describe it. |
Re: Bearing fit ... engine oil gravity feed Quote:
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Re: Bearing fit ... engine oil gravity feed It will probably run pretty warm until it does . I run two thousands clearance on the crankshaft bearings and run 20W50 oil
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Re: Bearing fit ... engine oil gravity feed I should be more clear on the subject. I personally run .002" clearance for street use, and .0035 piston clearance. .0025" and .008" on my race engine. 20-50 oil but synthetic racing for Bonneville. Modern oils in the gear boxes.
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Re: Bearing fit ... engine oil gravity feed Quote:
I once heard it said that there are plenty of cars running around out there with bearings that are too loose. There are no cars running around out there with bearings too tight. I run a clearance of 0.002" and use 20W50 oil, like Purdy. |
Re: Bearing fit ... engine oil gravity feed If your running a true .001 or less, on set up, the bearing has no choice but to Smear the first .010 of babbitt, or less, and that is a waste. Normal Rod clearance of a broke in engine is .002, to .003 thousandths, depending how much heat you crate, running at higher speeds.
All our bearings, we set our clearance to, .001 per inch of shaft, and always then plus a half, .000-50. So a shaft of 2.500 would get .003 thousandths clearance. Never had any problems. We use straight 30Wt. Summer, Straight .20Wt. winter. 5-30's, and the like, do not have enough cushion of oil molecule to keep shaft, and Babbitt separated, very thin oil film. Herm |
Re: Bearing fit ... engine oil gravity feed EDIT
Herm I did not see your post. |
Re: Bearing fit ... engine oil gravity feed Herm,
1. Is 20W50 oil too thick for a B Engine in Winter? 2. Too thick in Summer? Sounds like you avoid Multi weight oils? |
Re: Bearing fit ... engine oil gravity feed Quote:
Yes, for all the bearings we work with. Take a little 5-30, or other multi oil, an warm some in a little saucepan, and and when you can touch it without burning yourself, put some between your index finger, and thumb, and rub them back and fourth, hard. Then do the same thing with 30-Wt., and see what you think. I hope I didn't tell you more then I know! Herm. |
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