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 geodon
Wolfsburg Wizard
Posts: 478
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Registered: August 28th, 2002
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Location: geelong
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| posted on May 5th, 2008 at 09:33 AM |
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How do YOU chk a needle & seat??
For decades, I have just try to blow thru it & press the needle with light finger pressure & if it blocks, I assume its OK.
Over time I've sometimes noticed a bit of fuel dripping from the throttle spindle & a slight difficulty starting from hot. Didn't pay much
attention.
Last week, in the bush, I parked overnight on an up slope with a full tank.
I got home to fumes from the engine & found a lovely halo of oil spray on the inside of the engine lid (KG)
The fuel had leaked into the sump & thinned out the oil so much that it defeated the oil return scroll on the fan pulley!
Oil change fixed the proplem- hopefully no damage to bearing & barrells!
Wot's the go with needle & seats? I'm tempted to rig up a carby in the vice & leave a old m/cycle tank of fuel connected to it o'nite with
gravity feed to see if it leaks!
Or do ppl just replace them regularly?
If you have an older VW with a fuel tap, it may be an idea to turn it OFF when parked uphill to make sure.
Funny, but until recently, all m/cycles had fuel taps that you turned off when parked. That's a habit I always follow when parking my old BMW R100RS
as a matter of course. Is there a lesson there?
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
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| posted on May 5th, 2008 at 03:05 PM |
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I always have replaced the needle and seat
whenever I had a leakage problem..
it usually fixes the problem...
it doesn't take much for the N&S to leak...
do you have a good fuel filter on the fuel line?
its also much cheaper than a new motor.... lol
cheers
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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 matberry
Super Moderator
Go hard or go home
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| posted on May 5th, 2008 at 07:55 PM |
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Pull a vacuum on the inlet side and let gravity pull on the needle [with your mouth will do] When the vac is good , seal it and it will hold the
needle. If it drops you got a leaking needle or seat. New does not mean good. Sometimes you can lap the needle to get a good seal [car polish willdo].
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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geodon
Wolfsburg Wizard
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| posted on May 6th, 2008 at 11:37 AM |
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Matberry, thank you! Nothing like lateral thinking is there! That eliminates the problem of over compensating by pushing on the needle with a finger
much harder than the float could possibly do it. I apply a similar principle to bleeding brakes: rather than pumping the master cylinder, I suck fluid
out of each bleeder nipple with a disposable 60ml syringe. It also makes it a one man job!
Lee u r right; they cost peanuts anyway!
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