Ned Smith <smithn00@kitepilot.net> wrote: << I am having a problem with engine
"run on." The engine has about 1000 mi. on a complete rebuild. The distributor
was rebuilt. The carbs have new overhaul kits. I have seen several posts in
the archives on how to deal with run on but none on how to prevent it.
Your suggestions are greatly appreciated, >>
Hi Ned; Here is an article by Norm Nock that discusses how to prevent
anti-run-on / dieseling. One problem though; I don't have the diagram that is
referred to. Sorry.
--Scott Morris Simcoe, Ontario, Canada
'62 MkII BT7-driver; '60 MkI BN7-project
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Anti Run On Valve
technical article written by Norman Nock of British Car Specialists,
Stockton, California.
Installing an Anti Run On Valve to an Austin Healey
This device was fitted to the TR6, Spitfire, TR7, MGB, and Midgets. If all
the units of the anti run on system are working correctly the engine will stop
the instant the ignition is turned off, no matter what the engine temperature.
The vacuum lines must be a good fit with no leaks, gaskets and seals on the
float chambers must have a tight seal. In order to install this system on a
Healey BN4 thru BJ8 follow these directions.
1. Remove the brass plug from the oil gallery behind the rear exhaust
manifold flange joint.
2. Drill hole and tap 1/8 x 27 N.P.T through the center of the brass plug, be
very sure to drill the first hole exactly on center.
3. Solder closed one of the straight brass fittings, then drill a small 1/16
hole, This is a bleed hole to retain oil pressure in the 1/4 steel line to the
oil switch until after the engine has stopped. This operation is not absolutely
necessary but it does make for a quicker engine stop.
4. Install brass plug and fit adaptors sealing the threads to stop oil leaks.
Fit brass fittings leaving the 900 elbow facing down.
5. Use a pipe bender to bend the 1/4 steel pipe as per diagram. Locating the
switch away from the exhaust heat. Fit the switch to the end of pipe and attach
the pipe to the pan bolts.
6. Make a bracket and fit the anti run on valve onto the chassis rail as per
diagram, and turn 450 to lock into square hole.
7. Pick up manifold vacuum from rear of inlet manifold.
8. Wire as per diagram, use colored 18 S.W.G. wires to make it easier to
trace.
Not all S.U. float bowl caps have an external pipe for a breather. The cap
must have a tight vacuum seal. Some caps have a small cut away in the center of
the lid, others have a small bleed hole. check if the float tickler hole is
blocked off. There has to be no bleed holes in the float chamber lid for the
vacuum to escape when applied. If yours is like this you need to change the
float bowl lid or fit your own breather pipe.
100/4 : --To obtain oil pressure on this model you would need to pick it up
off the aluminium filter base and vacuum could be obtained from fitting an
adaptor to the inlet balance pipe.
J. Scott Morris - Keep Smiling, Murphy Lives
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