Uh oh, something broke....

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borntofli

Member
Jul 27, 2012
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tx
66 Ht started making a slight banging noise so I peddled home.... Took it apart and see a 1/16" needle bearing part that has been banging between the piston and head.....

where did it come from??? Wrist pin bearing or something lower???

Can I just put a new top end on it and go on?? Hopefully I can shake out any pieces from the bottom that may have made their way there......

Good thing I had a spare engine to replace it with.... Its my only form of transportation.....
 
Desert Rat

Desert Rat

New Member
Jul 30, 2012
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Apache Junctoin Az
borntofli said:
66 Ht started making a slight banging noise so I peddled home.... Took it apart and see a 1/16" needle bearing part that has been banging between the piston and head.....

where did it come from??? Wrist pin bearing or something lower???

Can I just put a new top end on it and go on?? Hopefully I can shake out any pieces from the bottom that may have made their way there......

Good thing I had a spare engine to replace it with.... Its my only form of transportation.....
Click to expand...
That I know of there are only four places it could come from
2 pins hold the rings in place, and a needle bearing at top and bottom
of conrod you'll just have to look, does it seem to have done any damage
to piston or cylinder walls? if not replace with new part and go or swap out
part from new engine and order another your choice.
 
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borntofli

Member
Jul 27, 2012
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16
tx
Took the cyl off and found the needle bearing has failed.... A few dings on the piston and head.... will replace w/ better bearing and see what happenbs.... I ordered a bunch to upgrade all my engines....
 
Toadmund

Toadmund

New Member
Jan 19, 2012
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Saint John, New Brunswick, Canada
Here is something I did, Bought a couple teflon washers, sanded them down and widened the holes to fit my pin. cleaned them up then installed them.
This stops your needle bearing from drifting out witch puts uneven stress on the bearing.

I learned this from another thread, except they used nylon spacers.
 

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crassius

crassius

Well-Known Member
Sep 30, 2012
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sounds good as a scatter shield, but do they interfere with oiling on the bearing?
 
Toadmund

Toadmund

New Member
Jan 19, 2012
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Saint John, New Brunswick, Canada
The rod has an oil hole, and I believe plenty of oil can get past the teflon rings.
Everything seems OK, I'll be able to see how they are doing next time I take the head off.

Whatever the case, it gives me peace of mind to not worry about bearing drift.
 
Toadmund

Toadmund

New Member
Jan 19, 2012
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Saint John, New Brunswick, Canada
After searching this forum for about 30 minutes now, I realised that I read this on another forum!
Don't know if I can link this, but here it is, wavy washers, brass, nylon etc.


Do this and stop worrying about your bearings getting destroyed.
 
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crassius

crassius

Well-Known Member
Sep 30, 2012
4,032
158
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USA
finally had some time to look thru old motors around here - only found one VERY old one that had that gap at the needle bearing on the wrist pin, all others don't need any spacers put in at all

problem must be local to some geographic area or certain vendors I'd guess
 
Toadmund

Toadmund

New Member
Jan 19, 2012
792
6
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Saint John, New Brunswick, Canada
Destroyed piston, cylinder; lower piston rod bearings were the cause, but no damage to crankcase bearings, and no damage to my wrist pin bearings, the teflon spacers held up well (may even helped protect them from shredded bearing bits), they did seem to flatten or/and wear a bit, but very minor.

When I rebuild my motor, teflon spacers are going in again, that's for sure.

Now, if only there was a way to improve the reliability of the lower needle bearings?
 
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