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1972 Saab 96 V$ Overheating
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Posted by Glenn Fearon [Email] (more from Glenn Fearon) on Mon, 23 Oct 2023 09:41:25 Share Post by Email
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Hello - my Saab 96 V4 is consistently overheating and I cannot seem to isolate the problem. I will give you a list of steps I have taken to try and isolate the problem. Non-Saab folks tell me it is a head gasket failure but I have been getting mixed results on ruling that in or out. I hope that your experience can advise the next step before I start dismantling the top of the engine for the head gasket replacement.

I pulled all the plugs and disconnected the fuel pump and turned it over to see if any fluid shot out but there wasn’t any.

See attached photo of removed plugs - I didn't see anything unusual

Then I tested the compression at each cylinder
Cylinder 1 - 112
Cylinder 2 - 118
Cylinder 3 - 121
Cylinder 4 - 116

Disconnected the heater core from the coolant loop.

Radiator cap marked 13 for 13psi? I assume is correct

Pulled the thermostat and tested it on the stovetop. It is rated at 180 and started operating at about that temperature and was fully open by 190 degrees.

Tried to use a pressure tester at the radiator cap but the kit I have didn't provide a proper seal so I was losing pressure right at the cap.

Instead I picked up a block test kit with the blue fluid. I ran the engine and proceeded with that test. The blue liquid did not change color at all and I confirmed that there was a tight fit at the filler neck. I did observe some slow bubbles rising in the blue fluid when I was using the bulb to pump air into the tester vial. When the engine is running I do not see a surface of bubbles in the radiator filler neck like I have seen on some of the videos of engines with a blown head gasket.

Just in the time of running the engine for the block test the needle was pinned on the temperature gauge


Other repairs I have made to this engine.

Removed water pump and confirmed the vanes are in good state.
Newly rebuilt alternator and new V belt.
Replaced the fan with a used original black rubberized one - see photo of engine
Replaced the old weber carb with a new weber carb
New electric fuel pump
New fuel pressure gauge.
New spark plugs

Looking forward to your insight. Thank you to this community in advance.



posted by 198.102.58...

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