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Larry F 
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Joined: 22 May 2011
Location: Denver
Points: 4
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 Topic: AC7 Turbocharger
Posted: 22 May 2011 at 3:38pm |
Can I use the 74029309 Turbo in place of the 74027204. The manual calls for the 27204 which I can not find. I have located the 29309. The 29309 is for a later serial nubered engine. This is on a AC 7gb craller. This is information from the manual. The engin serial number is 3D12351.
Thanks in advance.
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Dnoym N. S. Can.
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Joined: 03 Oct 2009
Points: 544
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Posted: 22 May 2011 at 5:48pm |
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UA33002 TurbochargerNew T04B90 ModelReplaces number D4029309, 74029309, 74029207,
74036513, 74062751, 84062751, 409080-5009
Includes Mounting Gaskets
(T04B90 Model)
Fits: 7030, 7040, 7045, 7050, 7060,
(210, 220, D21 Air Research Replacement)
BOLT ON REPLACEMENT FOR AIRESEARCH.
IF REPLACING RAY JAY TURBO, LINES & AIR
TUBE NEED TO BE CHANGED OR MODIFIED.
Larry i could not find anything on that
tubo number 74027204.maybe someone
else can help you
hth B:-) Dnoym
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DrAllis
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Joined: 12 Sep 2009
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Posted: 22 May 2011 at 9:21pm |
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If your old turbo is an "AirResearch" brand it probably has a V-clamp holding the compressor housing to the center section. The newer AirResearch turbo doesn't have the V-clamp, but is bolted. They will interchange with a little hardware modification on the oil lines and the rubber hose that connects the air inlet (newer turbo is about an inch shorter). If your old turbo is a "Thompson" or "Rajay" brand, the newer model will also work but you will have to be more creative on your oil lines.....like maybe use a hose for oil return and make a supply line from copper tubing and brass compression connections and fabricate a crossover tube to the intake manifold as well.
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Larry F
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Joined: 22 May 2011
Location: Denver
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Posted: 22 May 2011 at 9:39pm |
DrAllis
My Turbo is bolted and has no V clamp. It sounds as if it may have had a new tubo installed at some point. It appears as though the 74029309 replacement will work and I may or may not need to modify the air and oil line. Thank you for the reply.
Larry
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Larry F
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Location: Denver
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Posted: 22 May 2011 at 9:41pm |
DrAllis
In addition the old turbo is an Airesearch with no v clamp.
Larry
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DrAllis
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Posted: 22 May 2011 at 10:00pm |
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Then, they may be indentical except for the exhaust housing size/ratio....usual size is a .96 A/R and other sizes make be .84 A/R or .81 A/R.....the smaller numbers are tighter and allow the turbo to "spool up" at a slower RPM. Farm tractors use .96 and spool up at 1700 RPM and high idle at 24-2500 RPM. The size number is stamped on the exhaust housing somewhere is you are able to read it....sometimes inside where the exhaust housing bolts to the manifold.
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groanwow
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Joined: 12 Apr 2012
Location: Australia
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Posted: 20 Apr 2012 at 1:10am |
My knowledge about turbochargers is very poor...thanx for the great post... It was very informative and useful....
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