The bearing doctor!!!

Kioshk said:
That the seals should be AWAY from the crank? I'm getting the idea that the experts here are suggesting that the open-side of the bearings should face outwards. Would you geniuses set me straight?
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The clutch shaft bearings should be sealed on both sides. There is no internal lubrication from the engine to lube these bearings. If no seals are used, the bearing will burn up.

On the crankshaft the oil/fuel needs to lubricate these bearings. When the bearing is in place you will see the bearing seal. Also the crankshaft has (2) seals that mount outside the bearing. These seals help with a loss of compression sometimes found in these engines.
 
I wonder if the double sealed bearing has sufficient quantity/quality lube inside to run the crank without the oil from the fuel ??!!??
 
I Sprayed mine with Marvel Mystery Oil then let the oil penitrate for a few days, not so much to lubricate but to prevent a dry start and heat friction, the Mystery Oil will also attract oil from fuel mixture.
 
crassius said:
I wonder if the double sealed bearing has sufficient quantity/quality lube inside to run the crank without the oil from the fuel ??!!??
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With these engines running such a high RPM, I wouldn't take the chance. It might but why even think about it at all. The clutch shaft is another story...the RPM's are cut way down.
 
you cannot rely on the outer seal of the bearing to hold your crankcase compression you must use external seals .and Ron's right put the good ones in
 
Legwon said:
so there is a total of 6 bearings,
(2) 6202 both sides sealed
(2) 6202 one side sealed (or no seals and get external seals - 15X35X7 & 14.8X27X3.8)
(1) top piston rod (wrist pin) - 10X14X13
(1) bottom piston rod - 10x14x15

right??

EDIT; this would be for the 66ht....
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NO!! Do NOT use a bearing for the crankshaft that doesn't have a outer seal. I had a engine come that way, and it didn't last as long as I thought it should of have. Why even think about a seal less bearing...it's not like it would save money to start with.
 
Have a 66 cc engine want to place crank case bearings with Timken 62022RSC3 bearings 15 x 35 x 11 mm but they have rubber grease seals compared to stock that has metal gease seals is it ok to use Timken they make best bearings
 
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