Wet Sumping Redux
- Thread starter rick in seattle
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"Hey, Windy, what does the TEENY little print say?"
WHEW, thought it was just me!
WHEW, thought it was just me!
Hortons Norton
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What tiny print????
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Oh, l believe I can make it out now..."if you can read this you should be riding a Ducati!"
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I think this is what it says.
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grandpaul said:
Look, I just enlarged what was on the picture. :mrgreen:
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I want to close this thread out by comparing the data sent to me by forum members.
I started this thread when I checked on the state of the sump of my stationary Mk3 and was surprised by 1 1/2 quarts of oil that streamed into and out of my 1 quart container. Since then, after topping off, I measured the sump flow over three days (results below). My mk 3 is a complete rebuild, but the oil pump WAS NOT refurbished as it looked good and passed the manual pump test (the bike has 24,000 original miles on it). I did refurb the check valve, which was, as many have stated, inoperable and stuck open. My measurement was made with the pistons at TDC.
Compiling the results:
Mexico Mike 1973 Commando refurbed pump no TDC 1.3 oz/day
PJL 1972 Commando 750 Combat no pump refurb at TDC 0.74 oz/day
Rick in Seattle 1975 Commando 850 Mk3 no pump refurb new check valve at TDC 0.96 oz/day
The manual reminds us to expect a "normal" sump oil volume of "a teacup or so" , say 8 oz? It appears from the remarkably consistent data above that this translates into 1-2 weeks of inactivity. Standing for a month, at least for the bikes above, would drain 1 quart (4 teacups?) into the sump. For myself, I plan to ignore wet sumping during the riding season as long as I fire up the Norton at least monthly. I'll drain the sump in the spring before that first delicious ride in the dry.
I started this thread when I checked on the state of the sump of my stationary Mk3 and was surprised by 1 1/2 quarts of oil that streamed into and out of my 1 quart container. Since then, after topping off, I measured the sump flow over three days (results below). My mk 3 is a complete rebuild, but the oil pump WAS NOT refurbished as it looked good and passed the manual pump test (the bike has 24,000 original miles on it). I did refurb the check valve, which was, as many have stated, inoperable and stuck open. My measurement was made with the pistons at TDC.
Compiling the results:
Mexico Mike 1973 Commando refurbed pump no TDC 1.3 oz/day
PJL 1972 Commando 750 Combat no pump refurb at TDC 0.74 oz/day
Rick in Seattle 1975 Commando 850 Mk3 no pump refurb new check valve at TDC 0.96 oz/day
The manual reminds us to expect a "normal" sump oil volume of "a teacup or so" , say 8 oz? It appears from the remarkably consistent data above that this translates into 1-2 weeks of inactivity. Standing for a month, at least for the bikes above, would drain 1 quart (4 teacups?) into the sump. For myself, I plan to ignore wet sumping during the riding season as long as I fire up the Norton at least monthly. I'll drain the sump in the spring before that first delicious ride in the dry.
Sorry to keep it going Rick but this bike has a mechanical electric switch that looks interesting. It just needs to be located beside the ignition switch for convenience.steven wardlaw said:
http://cgi.ebay.com/ebaymotors/Norton-D ... 951wt_1167
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