bultaco956(at)yahoo.com
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 Posted: Mon Sep 26, 2011 12:04 pm Post subject: CJ6A - Cabin Heat/Air plumbing, diverter valves - do Yak 52 |
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Has anyone adapted or installed cabin heat or fresh air vent controls or diverter valves from a Yak 18T or 52 (or something else) on a CJ6 to provide heat and fresh air through the firewall? <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
For that matter does anyone have a good parts diagram showing the components of the Yak 18T or 52 cabin heat/vent system?
I have a later model CJ6 that is plumbed for cabin heat and air at the engine baffles and firewall but still has the factory caps on the firewall ducts. I have installed the 18T SS exhaust with the heat muff and on/off valve on the muff (L side) and a fresh air funnel (R side). Scat tubes can now easily connect the fresh air funnel (R side) and heater muff outlet (L side) tubes to the L & R firewall ducts – however – most western general aviation installations seem to use a firewall side hot air diverter valve or “box” so as to keep a continuous stream of cooling air blowing through the heater muff to prevent internal deterioration of the exhaust inside the muff and subsequent CO issues. It seems like the only proper position for the existing valve on the 18T SS heat muff is continuously open for cooling air -- then to a firewall mounted or inline diverter valve to vent unwanted hot air when not being used for cabin heat. The CJ’s vent & heat tubes are 40 mm (about 1 ¼ inch; so 1 ¼ or 1 ½ inch scat tubing should work). The heater boxes I have found online for RV and general aviation applications seem to use 2 inch ducting and are too big. There is plenty of room for a vent shut off valve behind the firewall but it would seem preferable to have the heat/vent shut off controls on the engine side of the firewall for obvious reasons – particularly for heat.
I would appreciate hearing from anyone who has tackled this.
It would seem possible to construct inline cable controlled diverter valves (small heat/vent boxes) out of aluminum sheet (or SS) but an off the shelf solution would be preferable.
The CJ parts manual (the standard 5 blue books) I have only shows the version of the CJ with no heat/vent ducting at all at the baffle plates and firewall and is no help.
Thanks,
Jay Wells (Stripper)
1983 CJ6A (285 HP)
Potomac Falls, VA
Bultaco956(at)yahoo.com (Bultaco956(at)yahoo.com)
Cell 571-283-3554
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