1/4/02
Jon,
I am not directly familiar with the 4.2 engines, but have had
plenty of exposure to the Olds 215.
1) You should be able to determine the relative direction of water
pump rotation on the 2 engines by comparing the shapes of the housings
(partly in the front cover and partly in the pump casting itself).
Remember the water is always thrown away from the center of the pump and
rotating the same direction as the pump shaft rotates. Knowing the Olds
pump rotates clockwise, as viewed from the front, check the housing and see
if the outlet channels do indeed leave the pump cavity tangentially and in
a clockwise outward spiral. If that is so, then check the 4.2 housing to
see if the direction is the same or opposite.
2) Cannot help here at all.
3) I do not know what goes into the threaded hole on the 4.2 but
the hose on the Olds is indeed a thermostat bypass hose--pretty much
standard practice on engines of old. Its purpose is to allow coolant to
circulate around the engine and inyake manifold, bypassing the thermostat
and radiator, until it heats up sufficiently to open the thermostat and let
water circulate normally through the thermostat and through the radiator.
These actions maximizes the engine's warmup speed; establish a minimum
operating temperature; and generally minimize the range between max. and
min. temperatures. It is an important function but I do not know how it is
accomplished on the 4.2. Be sure you find out.
Good luck with your installation. It sounds like quite a bit of
work even though there already was a V8 in there.
Cheers,
Dave Kernberger
------------------------------------------------------------
>I'm in the process of fitting my 4.2 inot the TVR 3000S. It had an Olds 215
>already but there will still be some problems to solve. Today I made an
>adapter to screw onto the engine in place of the oilfilter in order to use a
>remote filter. the only direction available to me is forward, as frame,
>coolant conduits and damper eliminate most other directions. I can't even
>use the two plugs that are used by Rover for a remote cooler. My front cover
>has the oil pump driven by the crank, and accepts a distributor.
>My questions are three:
>1. Am I correct in assuming that the water pump turns counter to the engine?
>2. Would someone measure the effective diameters (circumferences might be
>easier and more reliable) of the crank and waterpump pulleys. I wanna make
>my own pulleys for a serpentine belt. Dayco is sending me the recommended
>dimensions for the grooves.I'd like to run the pump at a little slower than
>Rover did.
>3. My Olds water pump had a small appendage pointing toward the rear of the
>engine that connected to a mating nipple on the inlet manifold. The 4.2 pump
>has no suich nipple, while the 4.2 manifold has a threaded hole where the
>215 manifold had a nipple. What goes into that threaded hole? I use an SD-1
>EFI inlet because it's short vertically. It has the same nipple as the 215
>manifold. My understanding is that this is a bypass. Do I need it? Does
>rover accomplish the same function (I gotta admit, I don't know for sure
>what that function is) in some other way?
>Jon
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