Author Topic: Wet sump  (Read 805 times)

Offline baz123

  • Moving Up
  • **
  • Join Date: Feb 2017
  • Posts: 11
  • Karma: 0
Wet sump
« on: 25.03. 2018 17:02 »
hi all

Its that time of the year when the bike gets dragged out of the shed I was draining the sump as its been stood for a while and the oil was really thin like petrol had gotten in with the oil. I have heard in the past this is possible and fuel can seep through the fuel taps. Is this true or is there some other reason ?

Thanks for your time
regards baz
  59 A7SS

Online RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5064
  • Karma: 48
Re: Wet sump
« Reply #1 on: 25.03. 2018 17:58 »
Did you smell it? Did you check to see (smell) if oil in the tank is the same. You're probably right about the taps leaking, but it also means fuel getting by the float needle. If oil in tank is normal, and you haven't run the bike, you're probably OK, having drained the sump.  Fix the taps, float level and needle as soon as possible, then change the oil.  I think, best if you can get that all done before running the bike.

Now, wait to see if others agree with my diagnosis and recommendations.

Richard L.

Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6205
  • Karma: 35
Re: Wet sump
« Reply #2 on: 25.03. 2018 18:09 »

Offline baz123

  • Moving Up
  • **
  • Join Date: Feb 2017
  • Posts: 11
  • Karma: 0
Re: Wet sump
« Reply #3 on: 25.03. 2018 18:24 »
thanks for the reply
the oil that was left in the oil tank looked ok but the oil that came from the sump did smell of petrol.  I just didn't think it could get to the sump even if it was getting past the float bowl.

regards Baz
  59 A7SS

Online RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5064
  • Karma: 48
Re: Wet sump
« Reply #4 on: 25.03. 2018 18:33 »
Fuel overflowing the float level runs up into the venturi throat, past an open (or leaking) intake valve and past the rings.

...and my technical atatus here demands I add, "I believe."

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline a10gf

  • Wise & Enlightened
  • *
  • Join Date: Sep 2006
  • Posts: 2802
  • Karma: 42
  • West Coast, Norway & Alpes Maritimes, France
    • A10 GF
Re: Wet sump
« Reply #5 on: 25.03. 2018 18:40 »
For layups, I drain tank (avoid stale old petrol at next engine start, & no possibility of leaks inside or outside), then run engine until carb empty (avoiding jets gummed up by dried petrol residues). I believe this is a good habit.

And have had some good doses of leaking\bad fuel taps, needs regular checking :O)

...and the offtopics removed :O)

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Offline duTch

  • Ricketty Rocketty Golden Flashback
  • Wise & Enlightened
  • *
  • Join Date: Oct 2011
  • Posts: 4540
  • Karma: 41
Re: Wet sump
« Reply #6 on: 25.03. 2018 21:58 »

 
Quote
..... I have heard in the past this is possible and fuel can seep through the fuel taps. Is this true or is there some other reason ?

         Yep, only happened to me once, and runs down the bore(s), maybe even a small supply caught above the piston- could be a bit smoky *eek*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online cyclobutch

  • Wise & Enlightened
  • *
  • Join Date: Aug 2010
  • Posts: 1513
  • Karma: 14
Re: Wet sump
« Reply #7 on: 26.03. 2018 11:52 »
My Camel did it last year even though I thought the fuel taps were closed. And that’s a wet sump bike. Disgorged all out the back and onto the rear tyre and thence up the back of my riding jacket. Only realised when I got to the station – a ride of about 8 miles or so. Recovered the bike with my Previa and then couldn’t get my head around how it seemed to have lost so much but was still over level on the dip stick. Dipping with a pipe cleaner revealed how thin and pissy it  was, and smelt strongly of gas.

Luckily I don’t seem to have run the bearings. But how did that happen?
Various, including ...
'58 Iron Head Flash Bitza


Offline baz123

  • Moving Up
  • **
  • Join Date: Feb 2017
  • Posts: 11
  • Karma: 0
Re: Wet sump
« Reply #8 on: 26.03. 2018 11:57 »
thanks for all the reply's and good advice. Iv had the bike a few years and this is the first time this has happen good job I checked before starting it .  Thanks again.
regards Baz
  59 A7SS

Offline CotswoldsA7

  • A's Best Friend
  • ***
  • Join Date: Jan 2018
  • Posts: 42
  • Karma: 0
Re: Wet sump
« Reply #9 on: 31.03. 2018 08:51 »
Interesting post this. Always something to learn no matter how old you are. Food for thought.

Online Greybeard

  • Jack of all trades; master of none.
  • Wise & Enlightened
  • *
  • Join Date: Feb 2011
  • Posts: 6205
  • Karma: 35
Re: Wet sump
« Reply #10 on: 31.03. 2018 09:27 »
...run engine until carb empty (avoiding jets gummed up by dried petrol residues). I believe this is a good habit.
I always do that when I'm parking.

Online BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 2018
  • Karma: 32
    • BSA National
Re: Wet sump
« Reply #11 on: 31.03. 2018 12:07 »
Double ditto on the drain the carb & shut off the fuel taps.
I starve all my engines off if the bike is going to be laid up for more than a few hours.

Most common cause of blown gaskets and bent rods on mower engines.
Hydro locking from fuel leaking into the cylinder.
Bike Beesa
Trevor

Online berger

  • Wise & Enlightened
  • *
  • Join Date: Nov 2017
  • Posts: 1152
  • Karma: 7
  • keith.chesterfield uk 500sscafe.norbsa project
Re: Wet sump
« Reply #12 on: 05.04. 2018 20:22 »
well well bike not been out since October and no wet sump, maybe the expensive but well made srm oil pump will be worth its money in time saved draining the crankcase, which means more time on the road. before I fitted the pump it allways needed draining after a few days, one day I thought sod it and fired it up resulting in oil out through the breather and a bonus of it blowing past the mag seal and filling the mag *pull hair out* which meant loads of *work* *problem* so ime now a happy bunny *grins*