The engine on my 1973 JDX8 runs but is missing on one side. Turns out there was quite a bit of gas in the bottom of the crankcase. Good spark, so a bit of a mystery. I've had this happen on the 300 and 400 too. I'm guessing there are many reasons why an engine might accumulate gas in the crankcase, but what might be a few of the most likely reasons? Thanks for the help!
Howard
Gas in Crankcase
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DLDeere
- Posts: 275
- Joined: Sun Feb 24, 2008 1:00 am
- Real Name: Howard Olson
- Location: Detroit Lakes MN
Gas in Crankcase
DL Deere
Detroit Lakes, MN
73 JD 400, 500, JDX4, JDX8
74 JDX4 Special, JDX8
74 JD 295/S
75 800
76 Liquidator
77 Liquifire
78 Liquifire
80 Liquifire
80 Spitfire
83 Snowfire
Detroit Lakes, MN
73 JD 400, 500, JDX4, JDX8
74 JDX4 Special, JDX8
74 JD 295/S
75 800
76 Liquidator
77 Liquifire
78 Liquifire
80 Liquifire
80 Spitfire
83 Snowfire
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WinnipegStPaul9
- Posts: 5577
- Joined: Sat Jul 23, 2005 12:00 am
- Real Name: Don Amber
- Location: Churubusco, IN
Re: Gas in Crankcase
Fuel pump or carb. Don't think you have a needle/seat but that's been the culprit on the cross country twice since I restored it. A little dirt under the needle and gas goes straight to crankcase. Pull plugs and then pull the recoil six hundred and fifty two times and everything should be fine.
DA
DA
Feel free to check out our website www.buscobullet.com for restorations or parts.
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400brian
- Posts: 5626
- Joined: Wed Jul 20, 2005 12:00 am
- Real Name: James T. Kirk
- Location: South Central Wisconsin
Re: Gas in Crankcase
Is it missing on the side the pulse line connects to? If so, I'd suspect a bad diaphragm in the carb.
The metering lever in the carb could be set too high. Is the engine running real rich?
The metering lever in the carb could be set too high. Is the engine running real rich?
'09 Vintage Challenge Survivor, and I wasn't late for supper!
'10, '11, '12, '13,'14,'15,'16,'17, '18, 19, 20, 21, 22 Vintage Challenge Survivor !
72 400 restored, Father bought new in '71
73 X8 restored
'74 340 green machine
'74 X8 9 time VC finisher
'78 Spitfire in progress
2 '75 340S 1 running, one on deck
'78 LF 440 future CC clone
'73 Skiroule RTX 440, 500 mi.
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HoosierDeereMan
- Posts: 1089
- Joined: Thu Feb 01, 2007 1:00 am
- Real Name: Troy Miley
- Location: Oakland City, IN
Re: Gas in Crankcase
Does your needle have a Viton tip? The aftermarket kits usually come with a Viton tipped needle. I have been told not to use these as they will leak by. If the original metal tip needle looks okay, I always try to re-use them.
Troy
Troy
'72 400
'73 400, (2)500's, 600
'74 295/S (restored) 2010 HOF poker run survivor.
'75 800, JDX8,
'75 340/S 2011 & 2012 Vintage Challenge finisher.
'76 (2)400's
'78 Liquifire 340,440
'79 Spitfire
"If it has Tits, Tires, or Tracks it's gonna cost you money!"
'73 400, (2)500's, 600
'74 295/S (restored) 2010 HOF poker run survivor.
'75 800, JDX8,
'75 340/S 2011 & 2012 Vintage Challenge finisher.
'76 (2)400's
'78 Liquifire 340,440
'79 Spitfire
"If it has Tits, Tires, or Tracks it's gonna cost you money!"
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DLDeere
- Posts: 275
- Joined: Sun Feb 24, 2008 1:00 am
- Real Name: Howard Olson
- Location: Detroit Lakes MN
Re: Gas in Crankcase
PTO side was the one not firing. Pulse line is connected on the mag side. Not sure what tip is on the needle but will keep that in mind if problem reoccurs. Also will check metering lever again if necessary. Doesn't seem to be running rich. Good spark plug color on the good side. Sounds like the most common reason for this is too much gas coming in through the carb, either from metering lever set to high or bad tip on the needle.
Would a bad oil seal or bad seal around the lower crank cause gas to accumulate instead of getting pushed into the cylinder?
Would a bad oil seal or bad seal around the lower crank cause gas to accumulate instead of getting pushed into the cylinder?
DL Deere
Detroit Lakes, MN
73 JD 400, 500, JDX4, JDX8
74 JDX4 Special, JDX8
74 JD 295/S
75 800
76 Liquidator
77 Liquifire
78 Liquifire
80 Liquifire
80 Spitfire
83 Snowfire
Detroit Lakes, MN
73 JD 400, 500, JDX4, JDX8
74 JDX4 Special, JDX8
74 JD 295/S
75 800
76 Liquidator
77 Liquifire
78 Liquifire
80 Liquifire
80 Spitfire
83 Snowfire
Re: Gas in Crankcase
You are correct Howard.
Gasket or seal leak would affect transfer.
Gasket or seal leak would affect transfer.
Todd Schrupp
Milbank SD
Milbank SD