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sierrapipe
Samba Member
Joined: April 25, 2014
Posts: 3
Location: Meadow Vista, Ca.
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 Posted: Sat Oct 25, 2014 10:58 am Post subject: clogged heat riser tubes |
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| How do I unclog the heat riser tube? Has anyone used Zarwerks to purchase a K manifold or the heat riser tubes they sell? This is for a 1960 bug 36hp Intake manifold VW# 111.129.701 E Thanks |
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60ragtop
Bonneville Belt Bitch
Joined: March 13, 2006
Posts: 7800
Location: Big Wonderful WYO 82401
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Aussiebug
Samba Member
Joined: June 03, 2002
Posts: 2162
Location: Adelaide Australia
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| Posted: Sat Oct 25, 2014 5:15 pm Post subject: |
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Yep.
About 18 inches of stiff cable like an old clutch cable (slightly more than half the length of the hear riser). Cut it off with bolt cutters (it's very tough steel) at an angle so you have a point on one side. Put it in a battery drill and spin BACKWARDS so the cable does not unravel. Drive it in from both ends.
If you try to use a long cable and go right through from one end, the cable whips around too much.
Once you have a small hole through the gunk, you can turn it upside down and soak overnight in carb cleaner, drain and drill it out again - that will get a lot more gunk out and keep it working longer.
The main reason they clog up is that folks wait too long before rebuilding an engine - if you drive it for a long time with the car burning oil, it builds up crud in the heat riser and eventually blocks it.
The heat riser is an essential part of the single carb setup on a bug - it keeps the intake warm so the fuel stays suspended in the air-stream along that long induction manifold, and it also stops icing under the carb in colder weather.
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Rob
Rob and Dave's aircooled VW pages
Repairs and maintenance for the home mechanic
http://www.vw-resource.com |
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 33986
Location: Conejo Valley, CA
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| Posted: Sun Oct 26, 2014 10:32 am Post subject: |
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| Aussiebug wrote: |
The main reason they clog up is that folks wait too long before rebuilding an engine - if you drive it for a long time with the car burning oil, it builds up crud in the heat riser and eventually blocks it.
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Another likely contributor is the lack of a thermostat. |
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Juanito84
Samba Member
Joined: March 17, 2012
Posts: 2436
Location: Colorado Mountains
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| Posted: Sun Oct 26, 2014 10:49 am Post subject: |
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| KTPhil wrote: |
| Aussiebug wrote: |
The main reason they clog up is that folks wait too long before rebuilding an engine - if you drive it for a long time with the car burning oil, it builds up crud in the heat riser and eventually blocks it.
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Another likely contributor is the lack of a thermostat. |
Another contributor might be those who enrich the A/F mixture to make up for missing and mismatched parts.
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If a water cooled engine cools its water with air, isn't it just an overcomplicated air cooled engine? |
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Aynthm
Samba Member
Joined: July 07, 2010
Posts: 1315
Location: Beaverton, Oregon
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| Posted: Sun Oct 26, 2014 1:17 pm Post subject: |
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| I used muriatic acid every night for 3 weeks with a drain auger. Just don't breathe the fumes, they will dissolve your lungs. |
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BWD
Samba Mailman
Joined: August 23, 2002
Posts: 2154
Location: In bed.
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John S.
Samba Member
Joined: December 18, 2013
Posts: 208
Location: Florida
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| Posted: Mon Oct 27, 2014 10:34 am Post subject: |
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I had success with filling the tube with water, soaking overnight then laying it on the gas grill and cooking it full blast for fifteen minutes.
Makes the carbon build-up break up as the water boils.
Still need to use the cable and drill to finish honing it out.
Non-toxic also!  |
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SuperSamba
Samba False Idol
Joined: June 03, 2000
Posts: 1536
Location: The Interwebs
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| Posted: Mon Oct 27, 2014 2:20 pm Post subject: |
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| Please see the FAQs above. |
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