Date:         Fri, 16 Nov 2007 11:15:55 -0800
Reply-To:     Michael Elliott <camping.elliott@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Elliott <camping.elliott@GMAIL.COM>
Subject:      Stall Speed Question
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Searching for reasons for poor mileage in Mellow Yellow (1984 1.9l auto
transmission), Dennis Haynes suggested I might check the torque
converter for slippage.

Using the procedure in Bentleys 37.16, my readings were high. The stall
speed spec for this transmission type* is 2450 to 2750 rpm. I measured
2850, 2700, 2850 in three successive tests (allowing for cooling time in
between), as indicated on my Tenma digital engine analyzer. The cheap-o
analog tach on the dash read lower. So there might be a question of
measurement accuracy here.

According the Bentley's, if the stall speed is high, the test is to be
done again in first gear. Here I measured 3000 rpm, still high.
Bentley's tells us that in this case, "forward clutch is defective."

First thing I'm going to do is see if I can get my mitts on a
known-to-be-good tachometer to sort out possible instrumentation error.

Second thing I'm going to do is toss out the following question: if the
forward clutch is defective, how sucky is that?

====
* I presume it is the NH type based on the model year of the van (1984),
the NH came into play in 10/82 per page 37.1a. How does one i.d. the
auto transmission?

--
Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR