Technical Tips > Post 84

87 C4 Leaks - but different leaks.

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Vettech:
Nah one Mustang in the family is enough besides that Eco boost flies.

Vettech:
Appears the other hose that disappears across under sump, up under manifold, up under compressor (c/w a 90° kink) then to maybe the water pump.

One cant really see in here, however, after much light applied, appears flywheel ? Has red/orange coating - ummm rust/leakage....

A quick fix (new hose+bypass heater) seems to be dissapearing in the mist.
Time to bite the bullit - the other alternative I cant find (1gal tin of petrol).

I need to now remove everything off the front of the engine, could require a pump etc etc.

I put some pics on our facebook site, the heater and oil cooler inlets have an in-ordinant amount of rusty muck in them.
With two hoses kinked, the flow was probably very slow, time enough for rust/corrosion to take hold

B's Mustang is starting to look very good..............

sabre:
Had the same leak problem when I first got mine. Heater core rotton and split. Biggest mongrel of a job to replace because when they turn the heater over for the conversion the inner box ends up behind the dash sepport crossmember. Bypass is the way to go unless you really want the heater.
Pipe going "under the sump" goes to secondary water pump inlet. Hot water comes from inlet manifold which gives flow to FI plenum so you can't block the curcuit. Water for oil cooler is drawn from the bottom of the block and drawn into a "T' in the line to the secondary pump inlet. Done that way to heat the oil in ice and snow. Should also be a small line (about 3/8") coming from the rear of inlet manifold to the same line. Important to not block it as it stops airlock in the top of the engine.
If you do decide to bypass, beware the inlet and outlet are diffrent sizes. One is 3/4" and the other 5/8".
Good luck.

Vettech:
Ahhhh just the person, yours is 87, do you still have all the AIR valves etc.??

O514 hrs !?!?!?

R u saying heater core comes out from inside not engine side.

Was considering removal and replace with older Comodore style.

Vettech:
The block  inlet, I thought was the water return after oil cooler, its been cut off.

Now I've got it apart, water seems to go, pump, oilcooler in, oil cooler out, heater in, heater out, then back around to pipes/fittings on RH side of runners/manifold at top of engine. And your right, there is a small metal tube runs from back of valley to the return pipe. In this cct there were two (2) 90° kinks in the hoses - flow would have been seriously impeded

I wonder if Corvette Qld would have still lying around any of the tubes, valves etc after their conversions, 5/8"ID rubber are bulky and dont bend too well.
There is also no heater water cut off, off course if there had been one in this cct, it would also cut off the oil cooler, and possibly negate your air bleed.

I know I'm being pedantic, I just want it as original as possible, a heater here in Oz is overkill, but when A/c running, is only way on flooded accumulator system to controll the outlet air temp.

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