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rennie
Samba Member
Joined: October 06, 2016
Posts: 246
Location: Orange County, CA
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 Posted: Sun Oct 08, 2017 8:30 pm Post subject: Re: Throttle shaft leak!! |
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Update... I measured my push rod as suggested. It's 108mm. It sticks up about 7mm from the bakelite on the down stroke, and maxes out at about 12mm on the high, for a total 5mm stroke. All in order with the Bentley and the type of pump I had... being the kind where the 'rocker' in the pump is recessed several mm - it doesn't protrude from the bottom of the pump, like the shorter pumps.
So, that pump seemed too high of psi (5). Thus, I bought another/new non-rebuildable pump and new needle valve from Norm at Mesa West, very close to me/convenient. Also, fully cleaned the carb... a second time (bus has new gas tank, new fuel line, etc).
Installed the new pump/reassembled carb... and basically no leak... just a tiny, barely detectable wet shine between the throttle shaft nut and the linkage on both sides of carb after hot shut-down. Acceptable to me as it's not like that after every shut-down. I haven't checked the pressure on the new pump yet.
BUT, per prior post, when first starting to research the throttle shaft leak, I did a fuel pressure test. Prior to that test the bus had been idling flawlessly. After the test it wouldn't idle to save my life!
I'll need to jump to a different thread, as it still doesn't want to idle consistently well... I'm now seeing condensation on the carb throat above the heat riser... and the throat feels cold after running it a while around town (tricky with inconsistent idle). I didn't think the heat riser would matter in So Cal (70+ degrees today), but I've read those are symptoms of the heat tube being plugged (fuel not atomizing).
One issue leads to another... but I'm learning a lot about me ol' bus!! |
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BarryL 
Samba Member
Joined: November 01, 2004
Posts: 14258
Location: Casa de Oro, California
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| Posted: Mon Oct 09, 2017 9:30 am Post subject: Re: Throttle shaft leak!! |
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| rennie wrote: |
| Installed the new pump/reassembled carb... and basically no leak... just a tiny, barely detectable wet shine between the throttle shaft nut and the linkage on both sides of carb after hot shut-down. Acceptable to me |
Hoo Ray! When you restart after going into the grocery store does it light right up on the first crank or do you have to crank it a bunch? It should fire right off. |
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Z
Samba Member
Joined: June 15, 2003
Posts: 2517
Location: galveston, tx
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| Posted: Mon Oct 09, 2017 10:32 am Post subject: Re: Throttle shaft leak!! |
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| rennie wrote: |
| I'm now seeing condensation on the carb throat above the heat riser... and the throat feels cold after running it a while around town (tricky with inconsistent idle). I didn't think the heat riser would matter in So Cal (70+ degrees today), but I've read those are symptoms of the heat tube being plugged (fuel not atomizing). |
That's exactly what mine was doing until I cleared the heat riser tube. Don't forget the warm air intake tin/pipe assembly. |
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rennie
Samba Member
Joined: October 06, 2016
Posts: 246
Location: Orange County, CA
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| Posted: Mon Oct 09, 2017 3:08 pm Post subject: Re: Throttle shaft leak!! |
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Yes, very glad about stopping the drips. Many thanks to all for your kind help!
Mixed results on idling though. Will check a few things after work and jump over to this thread later with more info:
https://www.thesamba.com/vw/forum/viewtopic.php?t=660896
A very timely fluke that idling took a dive whilst fixing the shaft leak. Heat riser/cold carb base investigation is next in line... |
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