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 Mountains Greg
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| posted on April 18th, 2009 at 09:31 AM |
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Clogged heat riser tube stock 1200 Bug
Hi guys,
Has anyone ever had problems with their 1200 manifold heat riser tube clogging up with black carbon?
I have tried cleaning it out with everything I can think of but, cannot get it clean.
It is only the heatriser tube which is clogged and this is causing icing around the carburetter and of course the bug hesitates and just is'nt
running right!
Takes forever to warm her up before I can drive up my street 
Is there anyone who can help with cleaning these. I tried a local engine builder but he could'nt acid bath it because of the cast alloy sections.
Cheers
Greg
If it's not in a Vee Dub I'm not going!
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ian.mezz
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I never said, I could write or spell
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| posted on April 18th, 2009 at 10:25 AM |
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I think you can buy new ones??? from Vintage
does your choke work???
I have seen people rig up a hot wire around manifold, bottom of carby does same job as heat pipes.
I have Beetles with and with out heat riser pipes , they all start and go ok on very cold mornings??? eg Katoomba mornings The only problem at Katoomba i cant see out the windscreen cause of the
fog inside the car
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Matt Ryan
A.k.a.: Matt Ryan
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| posted on April 18th, 2009 at 11:17 AM |
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Greg,
Here's Rob and Dave's un-blocking heat riser procedure from their VW-resource website.
http://www.vw-resource.com/heatriser.html
They use a piece of old clutch cable, frayed at one end, in a drill. If it's really blocked you might want to start first with a piece of speedo
cable (not frayed), or even some stiff fencing wire, then change over to their method.
Regards,
Matt.
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philew
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| posted on April 18th, 2009 at 11:20 AM |
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i once unblocked one with a bit of stainless cable i had lying around , put it in the end of a drill and drilled it out......carefully! i shredded my
hand when the cable came out and whipped around. need a bit of cable of reasonable diameter so that it dosn't flex too much. have heard that acid
poured down the tube works...didn't really work for me, and oxy torch down the end was another i read about somewhere,
prob. safer and less agro to buy a new one.
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 vw54
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| posted on April 18th, 2009 at 12:27 PM |
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the only way to fix is to cut or drill a hole near thebends and drill the carbon out using a long series drill
Or if you can find a new one buy one as theres about a good 10 hours work in fixing a blocked heat riser
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RISKYBUG
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| posted on April 18th, 2009 at 12:44 PM |
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try break fluid just keep putting more in over a week till it eats it's way down
thats with it off and upside down
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vw54
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| posted on April 18th, 2009 at 01:00 PM |
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| Quote: |
try break fluid just keep putting more in over a week till it eats it's way down
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It will be SOLID just like coal brake fluid wont touch it only a tipped drill bit
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Joel
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| posted on April 18th, 2009 at 03:03 PM |
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ive cleared a pretty blocked one before by drilling out the first bits of the pipe then leaving it upside down filled with a really harsh industrial
degreaser called active-shift for a few days
flushed it out with the garden hose, clean as inside after that
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Mountains Greg
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| posted on April 18th, 2009 at 09:42 PM |
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Thanks guys, 
I did try the stainless fencing wire in the drill method and had some success but the middle part below the carburetter is just rock hard. I just had
a look at the link you provided Matt... I never thought of pouring some carb cleaner in or strong degreaser to soak before trying the wire again... I
have been keeping an eye out for a new manifold but I think they're getting like rocking horse pooh to find! I have checked the auto choke and it's
doing what it should... Lastime I tried cleaning it out, it did run well again for a while so I'll have another go and let you know how I do this
time
Cheers
Greg
If it's not in a Vee Dub I'm not going!
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
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| posted on April 18th, 2009 at 11:17 PM |
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| Quote: | Originally
posted by Mountains Greg
Hi guys,
Has anyone ever had problems with their 1200 manifold heat riser tube clogging up with black carbon?
I have tried cleaning it out with everything I can think of but, cannot get it clean.
It is only the heatriser tube which is clogged and this is causing icing around the carburetter and of course the bug hesitates and just is'nt
running right!
Takes forever to warm her up before I can drive up my street
Is there anyone who can help with cleaning these. I tried a local engine builder but he could'nt acid bath it because of the cast alloy sections.
Cheers
Greg
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My 1500 single port manifold rusted thru... had it welded up but it wasn't long before it blocked up...
Carby iced up badly last winter....
I bought another manifold in nearly new condition from
Stokers siding garage 02 66779246 last year
A = hot air pick up tube
B = electric blanket 12V
LEE
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- [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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